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http://www.apache.org/licenses/
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vendor/maunium.net/go/mautrix/crypto/olm/README.md generated vendored Normal file
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# Go olm bindings
Based on [Dhole/go-olm](https://github.com/Dhole/go-olm)

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vendor/maunium.net/go/mautrix/crypto/olm/account.go generated vendored Normal file
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package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
import "C"
import (
"crypto/rand"
"encoding/base64"
"encoding/json"
"unsafe"
"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
"maunium.net/go/mautrix/crypto/canonicaljson"
"maunium.net/go/mautrix/id"
)
// Account stores a device account for end to end encrypted messaging.
type Account struct {
int *C.OlmAccount
mem []byte
}
// AccountFromPickled loads an Account from a pickled base64 string. Decrypts
// the Account using the supplied key. Returns error on failure. If the key
// doesn't match the one used to encrypt the Account then the error will be
// "BAD_ACCOUNT_KEY". If the base64 couldn't be decoded then the error will be
// "INVALID_BASE64".
func AccountFromPickled(pickled, key []byte) (*Account, error) {
if len(pickled) == 0 {
return nil, EmptyInput
}
a := NewBlankAccount()
return a, a.Unpickle(pickled, key)
}
func NewBlankAccount() *Account {
memory := make([]byte, accountSize())
return &Account{
int: C.olm_account(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// NewAccount creates a new Account.
func NewAccount() *Account {
a := NewBlankAccount()
random := make([]byte, a.createRandomLen()+1)
_, err := rand.Read(random)
if err != nil {
panic(NotEnoughGoRandom)
}
r := C.olm_create_account(
(*C.OlmAccount)(a.int),
unsafe.Pointer(&random[0]),
C.size_t(len(random)))
if r == errorVal() {
panic(a.lastError())
} else {
return a
}
}
// accountSize returns the size of an account object in bytes.
func accountSize() uint {
return uint(C.olm_account_size())
}
// lastError returns an error describing the most recent error to happen to an
// account.
func (a *Account) lastError() error {
return convertError(C.GoString(C.olm_account_last_error((*C.OlmAccount)(a.int))))
}
// Clear clears the memory used to back this Account.
func (a *Account) Clear() error {
r := C.olm_clear_account((*C.OlmAccount)(a.int))
if r == errorVal() {
return a.lastError()
} else {
return nil
}
}
// pickleLen returns the number of bytes needed to store an Account.
func (a *Account) pickleLen() uint {
return uint(C.olm_pickle_account_length((*C.OlmAccount)(a.int)))
}
// createRandomLen returns the number of random bytes needed to create an
// Account.
func (a *Account) createRandomLen() uint {
return uint(C.olm_create_account_random_length((*C.OlmAccount)(a.int)))
}
// identityKeysLen returns the size of the output buffer needed to hold the
// identity keys.
func (a *Account) identityKeysLen() uint {
return uint(C.olm_account_identity_keys_length((*C.OlmAccount)(a.int)))
}
// signatureLen returns the length of an ed25519 signature encoded as base64.
func (a *Account) signatureLen() uint {
return uint(C.olm_account_signature_length((*C.OlmAccount)(a.int)))
}
// oneTimeKeysLen returns the size of the output buffer needed to hold the one
// time keys.
func (a *Account) oneTimeKeysLen() uint {
return uint(C.olm_account_one_time_keys_length((*C.OlmAccount)(a.int)))
}
// genOneTimeKeysRandomLen returns the number of random bytes needed to
// generate a given number of new one time keys.
func (a *Account) genOneTimeKeysRandomLen(num uint) uint {
return uint(C.olm_account_generate_one_time_keys_random_length(
(*C.OlmAccount)(a.int),
C.size_t(num)))
}
// Pickle returns an Account as a base64 string. Encrypts the Account using the
// supplied key.
func (a *Account) Pickle(key []byte) []byte {
if len(key) == 0 {
panic(NoKeyProvided)
}
pickled := make([]byte, a.pickleLen())
r := C.olm_pickle_account(
(*C.OlmAccount)(a.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
panic(a.lastError())
}
return pickled[:r]
}
func (a *Account) Unpickle(pickled, key []byte) error {
if len(key) == 0 {
return NoKeyProvided
}
r := C.olm_unpickle_account(
(*C.OlmAccount)(a.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
return a.lastError()
}
return nil
}
func (a *Account) GobEncode() ([]byte, error) {
pickled := a.Pickle(pickleKey)
length := base64.RawStdEncoding.DecodedLen(len(pickled))
rawPickled := make([]byte, length)
_, err := base64.RawStdEncoding.Decode(rawPickled, pickled)
return rawPickled, err
}
func (a *Account) GobDecode(rawPickled []byte) error {
if a.int == nil {
*a = *NewBlankAccount()
}
length := base64.RawStdEncoding.EncodedLen(len(rawPickled))
pickled := make([]byte, length)
base64.RawStdEncoding.Encode(pickled, rawPickled)
return a.Unpickle(pickled, pickleKey)
}
func (a *Account) MarshalJSON() ([]byte, error) {
pickled := a.Pickle(pickleKey)
quotes := make([]byte, len(pickled)+2)
quotes[0] = '"'
quotes[len(quotes)-1] = '"'
copy(quotes[1:len(quotes)-1], pickled)
return quotes, nil
}
func (a *Account) UnmarshalJSON(data []byte) error {
if len(data) == 0 || data[0] != '"' || data[len(data)-1] != '"' {
return InputNotJSONString
}
if a.int == nil {
*a = *NewBlankAccount()
}
return a.Unpickle(data[1:len(data)-1], pickleKey)
}
// IdentityKeysJSON returns the public parts of the identity keys for the Account.
func (a *Account) IdentityKeysJSON() []byte {
identityKeys := make([]byte, a.identityKeysLen())
r := C.olm_account_identity_keys(
(*C.OlmAccount)(a.int),
unsafe.Pointer(&identityKeys[0]),
C.size_t(len(identityKeys)))
if r == errorVal() {
panic(a.lastError())
} else {
return identityKeys
}
}
// IdentityKeys returns the public parts of the Ed25519 and Curve25519 identity
// keys for the Account.
func (a *Account) IdentityKeys() (id.Ed25519, id.Curve25519) {
identityKeysJSON := a.IdentityKeysJSON()
results := gjson.GetManyBytes(identityKeysJSON, "ed25519", "curve25519")
return id.Ed25519(results[0].Str), id.Curve25519(results[1].Str)
}
// Sign returns the signature of a message using the ed25519 key for this
// Account.
func (a *Account) Sign(message []byte) []byte {
if len(message) == 0 {
panic(EmptyInput)
}
signature := make([]byte, a.signatureLen())
r := C.olm_account_sign(
(*C.OlmAccount)(a.int),
unsafe.Pointer(&message[0]),
C.size_t(len(message)),
unsafe.Pointer(&signature[0]),
C.size_t(len(signature)))
if r == errorVal() {
panic(a.lastError())
}
return signature
}
// SignJSON signs the given JSON object following the Matrix specification:
// https://matrix.org/docs/spec/appendices#signing-json
func (a *Account) SignJSON(obj interface{}) (string, error) {
objJSON, err := json.Marshal(obj)
if err != nil {
return "", err
}
objJSON, _ = sjson.DeleteBytes(objJSON, "unsigned")
objJSON, _ = sjson.DeleteBytes(objJSON, "signatures")
return string(a.Sign(canonicaljson.CanonicalJSONAssumeValid(objJSON))), nil
}
// OneTimeKeys returns the public parts of the unpublished one time keys for
// the Account.
//
// The returned data is a struct with the single value "Curve25519", which is
// itself an object mapping key id to base64-encoded Curve25519 key. For
// example:
//
// {
// Curve25519: {
// "AAAAAA": "wo76WcYtb0Vk/pBOdmduiGJ0wIEjW4IBMbbQn7aSnTo",
// "AAAAAB": "LRvjo46L1X2vx69sS9QNFD29HWulxrmW11Up5AfAjgU"
// }
// }
func (a *Account) OneTimeKeys() map[string]id.Curve25519 {
oneTimeKeysJSON := make([]byte, a.oneTimeKeysLen())
r := C.olm_account_one_time_keys(
(*C.OlmAccount)(a.int),
unsafe.Pointer(&oneTimeKeysJSON[0]),
C.size_t(len(oneTimeKeysJSON)))
if r == errorVal() {
panic(a.lastError())
}
var oneTimeKeys struct {
Curve25519 map[string]id.Curve25519 `json:"curve25519"`
}
err := json.Unmarshal(oneTimeKeysJSON, &oneTimeKeys)
if err != nil {
panic(err)
}
return oneTimeKeys.Curve25519
}
// MarkKeysAsPublished marks the current set of one time keys as being
// published.
func (a *Account) MarkKeysAsPublished() {
C.olm_account_mark_keys_as_published((*C.OlmAccount)(a.int))
}
// MaxNumberOfOneTimeKeys returns the largest number of one time keys this
// Account can store.
func (a *Account) MaxNumberOfOneTimeKeys() uint {
return uint(C.olm_account_max_number_of_one_time_keys((*C.OlmAccount)(a.int)))
}
// GenOneTimeKeys generates a number of new one time keys. If the total number
// of keys stored by this Account exceeds MaxNumberOfOneTimeKeys then the old
// keys are discarded.
func (a *Account) GenOneTimeKeys(num uint) {
random := make([]byte, a.genOneTimeKeysRandomLen(num)+1)
_, err := rand.Read(random)
if err != nil {
panic(NotEnoughGoRandom)
}
r := C.olm_account_generate_one_time_keys(
(*C.OlmAccount)(a.int),
C.size_t(num),
unsafe.Pointer(&random[0]),
C.size_t(len(random)))
if r == errorVal() {
panic(a.lastError())
}
}
// NewOutboundSession creates a new out-bound session for sending messages to a
// given curve25519 identityKey and oneTimeKey. Returns error on failure. If the
// keys couldn't be decoded as base64 then the error will be "INVALID_BASE64"
func (a *Account) NewOutboundSession(theirIdentityKey, theirOneTimeKey id.Curve25519) (*Session, error) {
if len(theirIdentityKey) == 0 || len(theirOneTimeKey) == 0 {
return nil, EmptyInput
}
s := NewBlankSession()
random := make([]byte, s.createOutboundRandomLen()+1)
_, err := rand.Read(random)
if err != nil {
panic(NotEnoughGoRandom)
}
r := C.olm_create_outbound_session(
(*C.OlmSession)(s.int),
(*C.OlmAccount)(a.int),
unsafe.Pointer(&([]byte(theirIdentityKey)[0])),
C.size_t(len(theirIdentityKey)),
unsafe.Pointer(&([]byte(theirOneTimeKey)[0])),
C.size_t(len(theirOneTimeKey)),
unsafe.Pointer(&random[0]),
C.size_t(len(random)))
if r == errorVal() {
return nil, s.lastError()
}
return s, nil
}
// NewInboundSession creates a new in-bound session for sending/receiving
// messages from an incoming PRE_KEY message. Returns error on failure. If
// the base64 couldn't be decoded then the error will be "INVALID_BASE64". If
// the message was for an unsupported protocol version then the error will be
// "BAD_MESSAGE_VERSION". If the message couldn't be decoded then then the
// error will be "BAD_MESSAGE_FORMAT". If the message refers to an unknown one
// time key then the error will be "BAD_MESSAGE_KEY_ID".
func (a *Account) NewInboundSession(oneTimeKeyMsg string) (*Session, error) {
if len(oneTimeKeyMsg) == 0 {
return nil, EmptyInput
}
s := NewBlankSession()
r := C.olm_create_inbound_session(
(*C.OlmSession)(s.int),
(*C.OlmAccount)(a.int),
unsafe.Pointer(&([]byte(oneTimeKeyMsg)[0])),
C.size_t(len(oneTimeKeyMsg)))
if r == errorVal() {
return nil, s.lastError()
}
return s, nil
}
// NewInboundSessionFrom creates a new in-bound session for sending/receiving
// messages from an incoming PRE_KEY message. Returns error on failure. If
// the base64 couldn't be decoded then the error will be "INVALID_BASE64". If
// the message was for an unsupported protocol version then the error will be
// "BAD_MESSAGE_VERSION". If the message couldn't be decoded then then the
// error will be "BAD_MESSAGE_FORMAT". If the message refers to an unknown one
// time key then the error will be "BAD_MESSAGE_KEY_ID".
func (a *Account) NewInboundSessionFrom(theirIdentityKey id.Curve25519, oneTimeKeyMsg string) (*Session, error) {
if len(theirIdentityKey) == 0 || len(oneTimeKeyMsg) == 0 {
return nil, EmptyInput
}
s := NewBlankSession()
r := C.olm_create_inbound_session_from(
(*C.OlmSession)(s.int),
(*C.OlmAccount)(a.int),
unsafe.Pointer(&([]byte(theirIdentityKey)[0])),
C.size_t(len(theirIdentityKey)),
unsafe.Pointer(&([]byte(oneTimeKeyMsg)[0])),
C.size_t(len(oneTimeKeyMsg)))
if r == errorVal() {
return nil, s.lastError()
}
return s, nil
}
// RemoveOneTimeKeys removes the one time keys that the session used from the
// Account. Returns error on failure. If the Account doesn't have any
// matching one time keys then the error will be "BAD_MESSAGE_KEY_ID".
func (a *Account) RemoveOneTimeKeys(s *Session) error {
r := C.olm_remove_one_time_keys(
(*C.OlmAccount)(a.int),
(*C.OlmSession)(s.int))
if r == errorVal() {
return a.lastError()
}
return nil
}

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vendor/maunium.net/go/mautrix/crypto/olm/error.go generated vendored Normal file
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package olm
import (
"errors"
"fmt"
)
// Error codes from go-olm
var (
EmptyInput = errors.New("empty input")
NoKeyProvided = errors.New("no pickle key provided")
NotEnoughGoRandom = errors.New("couldn't get enough randomness from crypto/rand")
SignatureNotFound = errors.New("input JSON doesn't contain signature from specified device")
InputNotJSONString = errors.New("input doesn't look like a JSON string")
)
// Error codes from olm code
var (
NotEnoughRandom = errors.New("not enough entropy was supplied")
OutputBufferTooSmall = errors.New("supplied output buffer is too small")
BadMessageVersion = errors.New("the message version is unsupported")
BadMessageFormat = errors.New("the message couldn't be decoded")
BadMessageMAC = errors.New("the message couldn't be decrypted")
BadMessageKeyID = errors.New("the message references an unknown key ID")
InvalidBase64 = errors.New("the input base64 was invalid")
BadAccountKey = errors.New("the supplied account key is invalid")
UnknownPickleVersion = errors.New("the pickled object is too new")
CorruptedPickle = errors.New("the pickled object couldn't be decoded")
BadSessionKey = errors.New("attempt to initialise an inbound group session from an invalid session key")
UnknownMessageIndex = errors.New("attempt to decode a message whose index is earlier than our earliest known session key")
BadLegacyAccountPickle = errors.New("attempt to unpickle an account which uses pickle version 1")
BadSignature = errors.New("received message had a bad signature")
InputBufferTooSmall = errors.New("the input data was too small to be valid")
)
var errorMap = map[string]error{
"NOT_ENOUGH_RANDOM": NotEnoughRandom,
"OUTPUT_BUFFER_TOO_SMALL": OutputBufferTooSmall,
"BAD_MESSAGE_VERSION": BadMessageVersion,
"BAD_MESSAGE_FORMAT": BadMessageFormat,
"BAD_MESSAGE_MAC": BadMessageMAC,
"BAD_MESSAGE_KEY_ID": BadMessageKeyID,
"INVALID_BASE64": InvalidBase64,
"BAD_ACCOUNT_KEY": BadAccountKey,
"UNKNOWN_PICKLE_VERSION": UnknownPickleVersion,
"CORRUPTED_PICKLE": CorruptedPickle,
"BAD_SESSION_KEY": BadSessionKey,
"UNKNOWN_MESSAGE_INDEX": UnknownMessageIndex,
"BAD_LEGACY_ACCOUNT_PICKLE": BadLegacyAccountPickle,
"BAD_SIGNATURE": BadSignature,
"INPUT_BUFFER_TOO_SMALL": InputBufferTooSmall,
}
func convertError(errCode string) error {
err, ok := errorMap[errCode]
if ok {
return err
}
return fmt.Errorf("unknown error: %s", errCode)
}

302
vendor/maunium.net/go/mautrix/crypto/olm/inboundgroupsession.go generated vendored Normal file
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package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
import "C"
import (
"encoding/base64"
"unsafe"
"maunium.net/go/mautrix/id"
)
// InboundGroupSession stores an inbound encrypted messaging session for a
// group.
type InboundGroupSession struct {
int *C.OlmInboundGroupSession
mem []byte
}
// InboundGroupSessionFromPickled loads an InboundGroupSession from a pickled
// base64 string. Decrypts the InboundGroupSession using the supplied key.
// Returns error on failure. If the key doesn't match the one used to encrypt
// the InboundGroupSession then the error will be "BAD_SESSION_KEY". If the
// base64 couldn't be decoded then the error will be "INVALID_BASE64".
func InboundGroupSessionFromPickled(pickled, key []byte) (*InboundGroupSession, error) {
if len(pickled) == 0 {
return nil, EmptyInput
}
lenKey := len(key)
if lenKey == 0 {
key = []byte(" ")
}
s := NewBlankInboundGroupSession()
return s, s.Unpickle(pickled, key)
}
// NewInboundGroupSession creates a new inbound group session from a key
// exported from OutboundGroupSession.Key(). Returns error on failure.
// If the sessionKey is not valid base64 the error will be
// "OLM_INVALID_BASE64". If the session_key is invalid the error will be
// "OLM_BAD_SESSION_KEY".
func NewInboundGroupSession(sessionKey []byte) (*InboundGroupSession, error) {
if len(sessionKey) == 0 {
return nil, EmptyInput
}
s := NewBlankInboundGroupSession()
r := C.olm_init_inbound_group_session(
(*C.OlmInboundGroupSession)(s.int),
(*C.uint8_t)(&sessionKey[0]),
C.size_t(len(sessionKey)))
if r == errorVal() {
return nil, s.lastError()
}
return s, nil
}
// InboundGroupSessionImport imports an inbound group session from a previous
// export. Returns error on failure. If the sessionKey is not valid base64
// the error will be "OLM_INVALID_BASE64". If the session_key is invalid the
// error will be "OLM_BAD_SESSION_KEY".
func InboundGroupSessionImport(sessionKey []byte) (*InboundGroupSession, error) {
if len(sessionKey) == 0 {
return nil, EmptyInput
}
s := NewBlankInboundGroupSession()
r := C.olm_import_inbound_group_session(
(*C.OlmInboundGroupSession)(s.int),
(*C.uint8_t)(&sessionKey[0]),
C.size_t(len(sessionKey)))
if r == errorVal() {
return nil, s.lastError()
}
return s, nil
}
// inboundGroupSessionSize is the size of an inbound group session object in
// bytes.
func inboundGroupSessionSize() uint {
return uint(C.olm_inbound_group_session_size())
}
// newInboundGroupSession initialises an empty InboundGroupSession.
func NewBlankInboundGroupSession() *InboundGroupSession {
memory := make([]byte, inboundGroupSessionSize())
return &InboundGroupSession{
int: C.olm_inbound_group_session(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// lastError returns an error describing the most recent error to happen to an
// inbound group session.
func (s *InboundGroupSession) lastError() error {
return convertError(C.GoString(C.olm_inbound_group_session_last_error((*C.OlmInboundGroupSession)(s.int))))
}
// Clear clears the memory used to back this InboundGroupSession.
func (s *InboundGroupSession) Clear() error {
r := C.olm_clear_inbound_group_session((*C.OlmInboundGroupSession)(s.int))
if r == errorVal() {
return s.lastError()
}
return nil
}
// pickleLen returns the number of bytes needed to store an inbound group
// session.
func (s *InboundGroupSession) pickleLen() uint {
return uint(C.olm_pickle_inbound_group_session_length((*C.OlmInboundGroupSession)(s.int)))
}
// Pickle returns an InboundGroupSession as a base64 string. Encrypts the
// InboundGroupSession using the supplied key.
func (s *InboundGroupSession) Pickle(key []byte) []byte {
if len(key) == 0 {
panic(NoKeyProvided)
}
pickled := make([]byte, s.pickleLen())
r := C.olm_pickle_inbound_group_session(
(*C.OlmInboundGroupSession)(s.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
panic(s.lastError())
}
return pickled[:r]
}
func (s *InboundGroupSession) Unpickle(pickled, key []byte) error {
if len(key) == 0 {
return NoKeyProvided
} else if len(pickled) == 0 {
return EmptyInput
}
r := C.olm_unpickle_inbound_group_session(
(*C.OlmInboundGroupSession)(s.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
return s.lastError()
}
return nil
}
func (s *InboundGroupSession) GobEncode() ([]byte, error) {
pickled := s.Pickle(pickleKey)
length := base64.RawStdEncoding.DecodedLen(len(pickled))
rawPickled := make([]byte, length)
_, err := base64.RawStdEncoding.Decode(rawPickled, pickled)
return rawPickled, err
}
func (s *InboundGroupSession) GobDecode(rawPickled []byte) error {
if s == nil || s.int == nil {
*s = *NewBlankInboundGroupSession()
}
length := base64.RawStdEncoding.EncodedLen(len(rawPickled))
pickled := make([]byte, length)
base64.RawStdEncoding.Encode(pickled, rawPickled)
return s.Unpickle(pickled, pickleKey)
}
func (s *InboundGroupSession) MarshalJSON() ([]byte, error) {
pickled := s.Pickle(pickleKey)
quotes := make([]byte, len(pickled)+2)
quotes[0] = '"'
quotes[len(quotes)-1] = '"'
copy(quotes[1:len(quotes)-1], pickled)
return quotes, nil
}
func (s *InboundGroupSession) UnmarshalJSON(data []byte) error {
if len(data) == 0 || data[0] != '"' || data[len(data)-1] != '"' {
return InputNotJSONString
}
if s == nil || s.int == nil {
*s = *NewBlankInboundGroupSession()
}
return s.Unpickle(data[1:len(data)-1], pickleKey)
}
func clone(original []byte) []byte {
clone := make([]byte, len(original))
copy(clone, original)
return clone
}
// decryptMaxPlaintextLen returns the maximum number of bytes of plain-text a
// given message could decode to. The actual size could be different due to
// padding. Returns error on failure. If the message base64 couldn't be
// decoded then the error will be "INVALID_BASE64". If the message is for an
// unsupported version of the protocol then the error will be
// "BAD_MESSAGE_VERSION". If the message couldn't be decoded then the error
// will be "BAD_MESSAGE_FORMAT".
func (s *InboundGroupSession) decryptMaxPlaintextLen(message []byte) (uint, error) {
if len(message) == 0 {
return 0, EmptyInput
}
// olm_group_decrypt_max_plaintext_length destroys the input, so we have to clone it
message = clone(message)
r := C.olm_group_decrypt_max_plaintext_length(
(*C.OlmInboundGroupSession)(s.int),
(*C.uint8_t)(&message[0]),
C.size_t(len(message)))
if r == errorVal() {
return 0, s.lastError()
}
return uint(r), nil
}
// Decrypt decrypts a message using the InboundGroupSession. Returns the the
// plain-text and message index on success. Returns error on failure. If the
// base64 couldn't be decoded then the error will be "INVALID_BASE64". If the
// message is for an unsupported version of the protocol then the error will be
// "BAD_MESSAGE_VERSION". If the message couldn't be decoded then the error
// will be BAD_MESSAGE_FORMAT". If the MAC on the message was invalid then the
// error will be "BAD_MESSAGE_MAC". If we do not have a session key
// corresponding to the message's index (ie, it was sent before the session key
// was shared with us) the error will be "OLM_UNKNOWN_MESSAGE_INDEX".
func (s *InboundGroupSession) Decrypt(message []byte) ([]byte, uint, error) {
if len(message) == 0 {
return nil, 0, EmptyInput
}
decryptMaxPlaintextLen, err := s.decryptMaxPlaintextLen(message)
if err != nil {
return nil, 0, err
}
plaintext := make([]byte, decryptMaxPlaintextLen)
var messageIndex uint32
r := C.olm_group_decrypt(
(*C.OlmInboundGroupSession)(s.int),
(*C.uint8_t)(&message[0]),
C.size_t(len(message)),
(*C.uint8_t)(&plaintext[0]),
C.size_t(len(plaintext)),
(*C.uint32_t)(&messageIndex))
if r == errorVal() {
return nil, 0, s.lastError()
}
return plaintext[:r], uint(messageIndex), nil
}
// sessionIdLen returns the number of bytes needed to store a session ID.
func (s *InboundGroupSession) sessionIdLen() uint {
return uint(C.olm_inbound_group_session_id_length((*C.OlmInboundGroupSession)(s.int)))
}
// ID returns a base64-encoded identifier for this session.
func (s *InboundGroupSession) ID() id.SessionID {
sessionID := make([]byte, s.sessionIdLen())
r := C.olm_inbound_group_session_id(
(*C.OlmInboundGroupSession)(s.int),
(*C.uint8_t)(&sessionID[0]),
C.size_t(len(sessionID)))
if r == errorVal() {
panic(s.lastError())
}
return id.SessionID(sessionID[:r])
}
// FirstKnownIndex returns the first message index we know how to decrypt.
func (s *InboundGroupSession) FirstKnownIndex() uint32 {
return uint32(C.olm_inbound_group_session_first_known_index((*C.OlmInboundGroupSession)(s.int)))
}
// IsVerified check if the session has been verified as a valid session. (A
// session is verified either because the original session share was signed, or
// because we have subsequently successfully decrypted a message.)
func (s *InboundGroupSession) IsVerified() uint {
return uint(C.olm_inbound_group_session_is_verified((*C.OlmInboundGroupSession)(s.int)))
}
// exportLen returns the number of bytes needed to export an inbound group
// session.
func (s *InboundGroupSession) exportLen() uint {
return uint(C.olm_export_inbound_group_session_length((*C.OlmInboundGroupSession)(s.int)))
}
// Export returns the base64-encoded ratchet key for this session, at the given
// index, in a format which can be used by
// InboundGroupSession.InboundGroupSessionImport(). Encrypts the
// InboundGroupSession using the supplied key. Returns error on failure.
// if we do not have a session key corresponding to the given index (ie, it was
// sent before the session key was shared with us) the error will be
// "OLM_UNKNOWN_MESSAGE_INDEX".
func (s *InboundGroupSession) Export(messageIndex uint32) (string, error) {
key := make([]byte, s.exportLen())
r := C.olm_export_inbound_group_session(
(*C.OlmInboundGroupSession)(s.int),
(*C.uint8_t)(&key[0]),
C.size_t(len(key)),
C.uint32_t(messageIndex))
if r == errorVal() {
return "", s.lastError()
}
return string(key[:r]), nil
}

32
vendor/maunium.net/go/mautrix/crypto/olm/olm.go generated vendored Normal file
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package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
import "C"
import (
"maunium.net/go/mautrix/id"
)
// Signatures is the data structure used to sign JSON objects.
type Signatures map[id.UserID]map[id.DeviceKeyID]string
// Version returns the version number of the olm library.
func Version() (major, minor, patch uint8) {
C.olm_get_library_version(
(*C.uint8_t)(&major),
(*C.uint8_t)(&minor),
(*C.uint8_t)(&patch))
return
}
// errorVal returns the value that olm functions return if there was an error.
func errorVal() C.size_t {
return C.olm_error()
}
var pickleKey = []byte("maunium.net/go/mautrix/crypto/olm")
// SetPickleKey sets the global pickle key used when encoding structs with Gob or JSON.
func SetPickleKey(key []byte) {
pickleKey = key
}

233
vendor/maunium.net/go/mautrix/crypto/olm/outboundgroupsession.go generated vendored Normal file
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package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
import "C"
import (
"crypto/rand"
"encoding/base64"
"unsafe"
"maunium.net/go/mautrix/id"
)
// OutboundGroupSession stores an outbound encrypted messaging session for a
// group.
type OutboundGroupSession struct {
int *C.OlmOutboundGroupSession
mem []byte
}
// OutboundGroupSessionFromPickled loads an OutboundGroupSession from a pickled
// base64 string. Decrypts the OutboundGroupSession using the supplied key.
// Returns error on failure. If the key doesn't match the one used to encrypt
// the OutboundGroupSession then the error will be "BAD_SESSION_KEY". If the
// base64 couldn't be decoded then the error will be "INVALID_BASE64".
func OutboundGroupSessionFromPickled(pickled, key []byte) (*OutboundGroupSession, error) {
if len(pickled) == 0 {
return nil, EmptyInput
}
s := NewBlankOutboundGroupSession()
return s, s.Unpickle(pickled, key)
}
// NewOutboundGroupSession creates a new outbound group session.
func NewOutboundGroupSession() *OutboundGroupSession {
s := NewBlankOutboundGroupSession()
random := make([]byte, s.createRandomLen()+1)
_, err := rand.Read(random)
if err != nil {
panic(NotEnoughGoRandom)
}
r := C.olm_init_outbound_group_session(
(*C.OlmOutboundGroupSession)(s.int),
(*C.uint8_t)(&random[0]),
C.size_t(len(random)))
if r == errorVal() {
panic(s.lastError())
}
return s
}
// outboundGroupSessionSize is the size of an outbound group session object in
// bytes.
func outboundGroupSessionSize() uint {
return uint(C.olm_outbound_group_session_size())
}
// newOutboundGroupSession initialises an empty OutboundGroupSession.
func NewBlankOutboundGroupSession() *OutboundGroupSession {
memory := make([]byte, outboundGroupSessionSize())
return &OutboundGroupSession{
int: C.olm_outbound_group_session(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// lastError returns an error describing the most recent error to happen to an
// outbound group session.
func (s *OutboundGroupSession) lastError() error {
return convertError(C.GoString(C.olm_outbound_group_session_last_error((*C.OlmOutboundGroupSession)(s.int))))
}
// Clear clears the memory used to back this OutboundGroupSession.
func (s *OutboundGroupSession) Clear() error {
r := C.olm_clear_outbound_group_session((*C.OlmOutboundGroupSession)(s.int))
if r == errorVal() {
return s.lastError()
} else {
return nil
}
}
// pickleLen returns the number of bytes needed to store an outbound group
// session.
func (s *OutboundGroupSession) pickleLen() uint {
return uint(C.olm_pickle_outbound_group_session_length((*C.OlmOutboundGroupSession)(s.int)))
}
// Pickle returns an OutboundGroupSession as a base64 string. Encrypts the
// OutboundGroupSession using the supplied key.
func (s *OutboundGroupSession) Pickle(key []byte) []byte {
if len(key) == 0 {
panic(NoKeyProvided)
}
pickled := make([]byte, s.pickleLen())
r := C.olm_pickle_outbound_group_session(
(*C.OlmOutboundGroupSession)(s.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
panic(s.lastError())
}
return pickled[:r]
}
func (s *OutboundGroupSession) Unpickle(pickled, key []byte) error {
if len(key) == 0 {
return NoKeyProvided
}
r := C.olm_unpickle_outbound_group_session(
(*C.OlmOutboundGroupSession)(s.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
return s.lastError()
}
return nil
}
func (s *OutboundGroupSession) GobEncode() ([]byte, error) {
pickled := s.Pickle(pickleKey)
length := base64.RawStdEncoding.DecodedLen(len(pickled))
rawPickled := make([]byte, length)
_, err := base64.RawStdEncoding.Decode(rawPickled, pickled)
return rawPickled, err
}
func (s *OutboundGroupSession) GobDecode(rawPickled []byte) error {
if s == nil || s.int == nil {
*s = *NewBlankOutboundGroupSession()
}
length := base64.RawStdEncoding.EncodedLen(len(rawPickled))
pickled := make([]byte, length)
base64.RawStdEncoding.Encode(pickled, rawPickled)
return s.Unpickle(pickled, pickleKey)
}
func (s *OutboundGroupSession) MarshalJSON() ([]byte, error) {
pickled := s.Pickle(pickleKey)
quotes := make([]byte, len(pickled)+2)
quotes[0] = '"'
quotes[len(quotes)-1] = '"'
copy(quotes[1:len(quotes)-1], pickled)
return quotes, nil
}
func (s *OutboundGroupSession) UnmarshalJSON(data []byte) error {
if len(data) == 0 || data[0] != '"' || data[len(data)-1] != '"' {
return InputNotJSONString
}
if s == nil || s.int == nil {
*s = *NewBlankOutboundGroupSession()
}
return s.Unpickle(data[1:len(data)-1], pickleKey)
}
// createRandomLen returns the number of random bytes needed to create an
// Account.
func (s *OutboundGroupSession) createRandomLen() uint {
return uint(C.olm_init_outbound_group_session_random_length((*C.OlmOutboundGroupSession)(s.int)))
}
// encryptMsgLen returns the size of the next message in bytes for the given
// number of plain-text bytes.
func (s *OutboundGroupSession) encryptMsgLen(plainTextLen int) uint {
return uint(C.olm_group_encrypt_message_length((*C.OlmOutboundGroupSession)(s.int), C.size_t(plainTextLen)))
}
// Encrypt encrypts a message using the Session. Returns the encrypted message
// as base64.
func (s *OutboundGroupSession) Encrypt(plaintext []byte) []byte {
if len(plaintext) == 0 {
panic(EmptyInput)
}
message := make([]byte, s.encryptMsgLen(len(plaintext)))
r := C.olm_group_encrypt(
(*C.OlmOutboundGroupSession)(s.int),
(*C.uint8_t)(&plaintext[0]),
C.size_t(len(plaintext)),
(*C.uint8_t)(&message[0]),
C.size_t(len(message)))
if r == errorVal() {
panic(s.lastError())
}
return message[:r]
}
// sessionIdLen returns the number of bytes needed to store a session ID.
func (s *OutboundGroupSession) sessionIdLen() uint {
return uint(C.olm_outbound_group_session_id_length((*C.OlmOutboundGroupSession)(s.int)))
}
// ID returns a base64-encoded identifier for this session.
func (s *OutboundGroupSession) ID() id.SessionID {
sessionID := make([]byte, s.sessionIdLen())
r := C.olm_outbound_group_session_id(
(*C.OlmOutboundGroupSession)(s.int),
(*C.uint8_t)(&sessionID[0]),
C.size_t(len(sessionID)))
if r == errorVal() {
panic(s.lastError())
}
return id.SessionID(sessionID[:r])
}
// MessageIndex returns the message index for this session. Each message is
// sent with an increasing index; this returns the index for the next message.
func (s *OutboundGroupSession) MessageIndex() uint {
return uint(C.olm_outbound_group_session_message_index((*C.OlmOutboundGroupSession)(s.int)))
}
// sessionKeyLen returns the number of bytes needed to store a session key.
func (s *OutboundGroupSession) sessionKeyLen() uint {
return uint(C.olm_outbound_group_session_key_length((*C.OlmOutboundGroupSession)(s.int)))
}
// Key returns the base64-encoded current ratchet key for this session.
func (s *OutboundGroupSession) Key() string {
sessionKey := make([]byte, s.sessionKeyLen())
r := C.olm_outbound_group_session_key(
(*C.OlmOutboundGroupSession)(s.int),
(*C.uint8_t)(&sessionKey[0]),
C.size_t(len(sessionKey)))
if r == errorVal() {
panic(s.lastError())
}
return string(sessionKey[:r])
}

111
vendor/maunium.net/go/mautrix/crypto/olm/pk.go generated vendored Normal file
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@@ -0,0 +1,111 @@
package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
// #include <olm/pk.h>
import "C"
import (
"crypto/rand"
"encoding/json"
"unsafe"
"github.com/tidwall/sjson"
"maunium.net/go/mautrix/crypto/canonicaljson"
"maunium.net/go/mautrix/id"
)
// PkSigning stores a key pair for signing messages.
type PkSigning struct {
int *C.OlmPkSigning
mem []byte
PublicKey id.Ed25519
Seed []byte
}
func pkSigningSize() uint {
return uint(C.olm_pk_signing_size())
}
func pkSigningSeedLength() uint {
return uint(C.olm_pk_signing_seed_length())
}
func pkSigningPublicKeyLength() uint {
return uint(C.olm_pk_signing_public_key_length())
}
func pkSigningSignatureLength() uint {
return uint(C.olm_pk_signature_length())
}
func NewBlankPkSigning() *PkSigning {
memory := make([]byte, pkSigningSize())
return &PkSigning{
int: C.olm_pk_signing(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// Clear clears the underlying memory of a PkSigning object.
func (p *PkSigning) Clear() {
C.olm_clear_pk_signing((*C.OlmPkSigning)(p.int))
}
// NewPkSigningFromSeed creates a new PkSigning object using the given seed.
func NewPkSigningFromSeed(seed []byte) (*PkSigning, error) {
p := NewBlankPkSigning()
p.Clear()
pubKey := make([]byte, pkSigningPublicKeyLength())
if C.olm_pk_signing_key_from_seed((*C.OlmPkSigning)(p.int),
unsafe.Pointer(&pubKey[0]), C.size_t(len(pubKey)),
unsafe.Pointer(&seed[0]), C.size_t(len(seed))) == errorVal() {
return nil, p.lastError()
}
p.PublicKey = id.Ed25519(pubKey)
p.Seed = seed
return p, nil
}
// NewPkSigning creates a new PkSigning object, containing a key pair for signing messages.
func NewPkSigning() (*PkSigning, error) {
// Generate the seed
seed := make([]byte, pkSigningSeedLength())
_, err := rand.Read(seed)
if err != nil {
panic(NotEnoughGoRandom)
}
pk, err := NewPkSigningFromSeed(seed)
return pk, err
}
// Sign creates a signature for the given message using this key.
func (p *PkSigning) Sign(message []byte) ([]byte, error) {
signature := make([]byte, pkSigningSignatureLength())
if C.olm_pk_sign((*C.OlmPkSigning)(p.int), (*C.uint8_t)(unsafe.Pointer(&message[0])), C.size_t(len(message)),
(*C.uint8_t)(unsafe.Pointer(&signature[0])), C.size_t(len(signature))) == errorVal() {
return nil, p.lastError()
}
return signature, nil
}
// SignJSON creates a signature for the given object after encoding it to canonical JSON.
func (p *PkSigning) SignJSON(obj interface{}) (string, error) {
objJSON, err := json.Marshal(obj)
if err != nil {
return "", err
}
objJSON, _ = sjson.DeleteBytes(objJSON, "unsigned")
objJSON, _ = sjson.DeleteBytes(objJSON, "signatures")
signature, err := p.Sign(canonicaljson.CanonicalJSONAssumeValid(objJSON))
if err != nil {
return "", err
}
return string(signature), nil
}
// lastError returns the last error that happened in relation to this PkSigning object.
func (p *PkSigning) lastError() error {
return convertError(C.GoString(C.olm_pk_signing_last_error((*C.OlmPkSigning)(p.int))))
}

355
vendor/maunium.net/go/mautrix/crypto/olm/session.go generated vendored Normal file
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@@ -0,0 +1,355 @@
package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
// #include <stdlib.h>
// #include <stdio.h>
// void olm_session_describe(OlmSession * session, char *buf, size_t buflen) __attribute__((weak));
// void meowlm_session_describe(OlmSession * session, char *buf, size_t buflen) {
// if (olm_session_describe) {
// olm_session_describe(session, buf, buflen);
// } else {
// sprintf(buf, "olm_session_describe not supported");
// }
// }
import "C"
import (
"crypto/rand"
"encoding/base64"
"unsafe"
"maunium.net/go/mautrix/id"
)
// Session stores an end to end encrypted messaging session.
type Session struct {
int *C.OlmSession
mem []byte
}
// sessionSize is the size of a session object in bytes.
func sessionSize() uint {
return uint(C.olm_session_size())
}
// SessionFromPickled loads a Session from a pickled base64 string. Decrypts
// the Session using the supplied key. Returns error on failure. If the key
// doesn't match the one used to encrypt the Session then the error will be
// "BAD_SESSION_KEY". If the base64 couldn't be decoded then the error will be
// "INVALID_BASE64".
func SessionFromPickled(pickled, key []byte) (*Session, error) {
if len(pickled) == 0 {
return nil, EmptyInput
}
s := NewBlankSession()
return s, s.Unpickle(pickled, key)
}
func NewBlankSession() *Session {
memory := make([]byte, sessionSize())
return &Session{
int: C.olm_session(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// lastError returns an error describing the most recent error to happen to a
// session.
func (s *Session) lastError() error {
return convertError(C.GoString(C.olm_session_last_error((*C.OlmSession)(s.int))))
}
// Clear clears the memory used to back this Session.
func (s *Session) Clear() error {
r := C.olm_clear_session((*C.OlmSession)(s.int))
if r == errorVal() {
return s.lastError()
}
return nil
}
// pickleLen returns the number of bytes needed to store a session.
func (s *Session) pickleLen() uint {
return uint(C.olm_pickle_session_length((*C.OlmSession)(s.int)))
}
// createOutboundRandomLen returns the number of random bytes needed to create
// an outbound session.
func (s *Session) createOutboundRandomLen() uint {
return uint(C.olm_create_outbound_session_random_length((*C.OlmSession)(s.int)))
}
// idLen returns the length of the buffer needed to return the id for this
// session.
func (s *Session) idLen() uint {
return uint(C.olm_session_id_length((*C.OlmSession)(s.int)))
}
// encryptRandomLen returns the number of random bytes needed to encrypt the
// next message.
func (s *Session) encryptRandomLen() uint {
return uint(C.olm_encrypt_random_length((*C.OlmSession)(s.int)))
}
// encryptMsgLen returns the size of the next message in bytes for the given
// number of plain-text bytes.
func (s *Session) encryptMsgLen(plainTextLen int) uint {
return uint(C.olm_encrypt_message_length((*C.OlmSession)(s.int), C.size_t(plainTextLen)))
}
// decryptMaxPlaintextLen returns the maximum number of bytes of plain-text a
// given message could decode to. The actual size could be different due to
// padding. Returns error on failure. If the message base64 couldn't be
// decoded then the error will be "INVALID_BASE64". If the message is for an
// unsupported version of the protocol then the error will be
// "BAD_MESSAGE_VERSION". If the message couldn't be decoded then the error
// will be "BAD_MESSAGE_FORMAT".
func (s *Session) decryptMaxPlaintextLen(message string, msgType id.OlmMsgType) (uint, error) {
if len(message) == 0 {
return 0, EmptyInput
}
r := C.olm_decrypt_max_plaintext_length(
(*C.OlmSession)(s.int),
C.size_t(msgType),
unsafe.Pointer(C.CString(message)),
C.size_t(len(message)))
if r == errorVal() {
return 0, s.lastError()
}
return uint(r), nil
}
// Pickle returns a Session as a base64 string. Encrypts the Session using the
// supplied key.
func (s *Session) Pickle(key []byte) []byte {
if len(key) == 0 {
panic(NoKeyProvided)
}
pickled := make([]byte, s.pickleLen())
r := C.olm_pickle_session(
(*C.OlmSession)(s.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
panic(s.lastError())
}
return pickled[:r]
}
func (s *Session) Unpickle(pickled, key []byte) error {
if len(key) == 0 {
return NoKeyProvided
}
r := C.olm_unpickle_session(
(*C.OlmSession)(s.int),
unsafe.Pointer(&key[0]),
C.size_t(len(key)),
unsafe.Pointer(&pickled[0]),
C.size_t(len(pickled)))
if r == errorVal() {
return s.lastError()
}
return nil
}
func (s *Session) GobEncode() ([]byte, error) {
pickled := s.Pickle(pickleKey)
length := base64.RawStdEncoding.DecodedLen(len(pickled))
rawPickled := make([]byte, length)
_, err := base64.RawStdEncoding.Decode(rawPickled, pickled)
return rawPickled, err
}
func (s *Session) GobDecode(rawPickled []byte) error {
if s == nil || s.int == nil {
*s = *NewBlankSession()
}
length := base64.RawStdEncoding.EncodedLen(len(rawPickled))
pickled := make([]byte, length)
base64.RawStdEncoding.Encode(pickled, rawPickled)
return s.Unpickle(pickled, pickleKey)
}
func (s *Session) MarshalJSON() ([]byte, error) {
pickled := s.Pickle(pickleKey)
quotes := make([]byte, len(pickled)+2)
quotes[0] = '"'
quotes[len(quotes)-1] = '"'
copy(quotes[1:len(quotes)-1], pickled)
return quotes, nil
}
func (s *Session) UnmarshalJSON(data []byte) error {
if len(data) == 0 || len(data) == 0 || data[0] != '"' || data[len(data)-1] != '"' {
return InputNotJSONString
}
if s == nil || s.int == nil {
*s = *NewBlankSession()
}
return s.Unpickle(data[1:len(data)-1], pickleKey)
}
// Id returns an identifier for this Session. Will be the same for both ends
// of the conversation.
func (s *Session) ID() id.SessionID {
sessionID := make([]byte, s.idLen())
r := C.olm_session_id(
(*C.OlmSession)(s.int),
unsafe.Pointer(&sessionID[0]),
C.size_t(len(sessionID)))
if r == errorVal() {
panic(s.lastError())
}
return id.SessionID(sessionID)
}
// HasReceivedMessage returns true if this session has received any message.
func (s *Session) HasReceivedMessage() bool {
switch C.olm_session_has_received_message((*C.OlmSession)(s.int)) {
case 0:
return false
default:
return true
}
}
// MatchesInboundSession checks if the PRE_KEY message is for this in-bound
// Session. This can happen if multiple messages are sent to this Account
// before this Account sends a message in reply. Returns true if the session
// matches. Returns false if the session does not match. Returns error on
// failure. If the base64 couldn't be decoded then the error will be
// "INVALID_BASE64". If the message was for an unsupported protocol version
// then the error will be "BAD_MESSAGE_VERSION". If the message couldn't be
// decoded then then the error will be "BAD_MESSAGE_FORMAT".
func (s *Session) MatchesInboundSession(oneTimeKeyMsg string) (bool, error) {
if len(oneTimeKeyMsg) == 0 {
return false, EmptyInput
}
r := C.olm_matches_inbound_session(
(*C.OlmSession)(s.int),
unsafe.Pointer(&([]byte(oneTimeKeyMsg))[0]),
C.size_t(len(oneTimeKeyMsg)))
if r == 1 {
return true, nil
} else if r == 0 {
return false, nil
} else { // if r == errorVal()
return false, s.lastError()
}
}
// MatchesInboundSessionFrom checks if the PRE_KEY message is for this in-bound
// Session. This can happen if multiple messages are sent to this Account
// before this Account sends a message in reply. Returns true if the session
// matches. Returns false if the session does not match. Returns error on
// failure. If the base64 couldn't be decoded then the error will be
// "INVALID_BASE64". If the message was for an unsupported protocol version
// then the error will be "BAD_MESSAGE_VERSION". If the message couldn't be
// decoded then then the error will be "BAD_MESSAGE_FORMAT".
func (s *Session) MatchesInboundSessionFrom(theirIdentityKey, oneTimeKeyMsg string) (bool, error) {
if len(theirIdentityKey) == 0 || len(oneTimeKeyMsg) == 0 {
return false, EmptyInput
}
r := C.olm_matches_inbound_session_from(
(*C.OlmSession)(s.int),
unsafe.Pointer(&([]byte(theirIdentityKey))[0]),
C.size_t(len(theirIdentityKey)),
unsafe.Pointer(&([]byte(oneTimeKeyMsg))[0]),
C.size_t(len(oneTimeKeyMsg)))
if r == 1 {
return true, nil
} else if r == 0 {
return false, nil
} else { // if r == errorVal()
return false, s.lastError()
}
}
// EncryptMsgType returns the type of the next message that Encrypt will
// return. Returns MsgTypePreKey if the message will be a PRE_KEY message.
// Returns MsgTypeMsg if the message will be a normal message. Returns error
// on failure.
func (s *Session) EncryptMsgType() id.OlmMsgType {
switch C.olm_encrypt_message_type((*C.OlmSession)(s.int)) {
case C.size_t(id.OlmMsgTypePreKey):
return id.OlmMsgTypePreKey
case C.size_t(id.OlmMsgTypeMsg):
return id.OlmMsgTypeMsg
default:
panic("olm_encrypt_message_type returned invalid result")
}
}
// Encrypt encrypts a message using the Session. Returns the encrypted message
// as base64.
func (s *Session) Encrypt(plaintext []byte) (id.OlmMsgType, []byte) {
if len(plaintext) == 0 {
panic(EmptyInput)
}
// Make the slice be at least length 1
random := make([]byte, s.encryptRandomLen()+1)
_, err := rand.Read(random)
if err != nil {
panic(NotEnoughGoRandom)
}
messageType := s.EncryptMsgType()
message := make([]byte, s.encryptMsgLen(len(plaintext)))
r := C.olm_encrypt(
(*C.OlmSession)(s.int),
unsafe.Pointer(&plaintext[0]),
C.size_t(len(plaintext)),
unsafe.Pointer(&random[0]),
C.size_t(len(random)),
unsafe.Pointer(&message[0]),
C.size_t(len(message)))
if r == errorVal() {
panic(s.lastError())
}
return messageType, message[:r]
}
// Decrypt decrypts a message using the Session. Returns the the plain-text on
// success. Returns error on failure. If the base64 couldn't be decoded then
// the error will be "INVALID_BASE64". If the message is for an unsupported
// version of the protocol then the error will be "BAD_MESSAGE_VERSION". If
// the message couldn't be decoded then the error will be BAD_MESSAGE_FORMAT".
// If the MAC on the message was invalid then the error will be
// "BAD_MESSAGE_MAC".
func (s *Session) Decrypt(message string, msgType id.OlmMsgType) ([]byte, error) {
if len(message) == 0 {
return nil, EmptyInput
}
decryptMaxPlaintextLen, err := s.decryptMaxPlaintextLen(message, msgType)
if err != nil {
return nil, err
}
plaintext := make([]byte, decryptMaxPlaintextLen)
r := C.olm_decrypt(
(*C.OlmSession)(s.int),
C.size_t(msgType),
unsafe.Pointer(&([]byte(message))[0]),
C.size_t(len(message)),
unsafe.Pointer(&plaintext[0]),
C.size_t(len(plaintext)))
if r == errorVal() {
return nil, s.lastError()
}
return plaintext[:r], nil
}
// https://gitlab.matrix.org/matrix-org/olm/-/blob/3.2.8/include/olm/olm.h#L392-393
const maxDescribeSize = 600
// Describe generates a string describing the internal state of an olm session for debugging and logging purposes.
func (s *Session) Describe() string {
desc := (*C.char)(C.malloc(C.size_t(maxDescribeSize)))
defer C.free(unsafe.Pointer(desc))
C.meowlm_session_describe(
(*C.OlmSession)(s.int),
desc,
C.size_t(maxDescribeSize))
return C.GoString(desc)
}

140
vendor/maunium.net/go/mautrix/crypto/olm/utility.go generated vendored Normal file
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@@ -0,0 +1,140 @@
package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
import "C"
import (
"encoding/json"
"fmt"
"unsafe"
"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
"maunium.net/go/mautrix/crypto/canonicaljson"
"maunium.net/go/mautrix/id"
"maunium.net/go/mautrix/util"
)
// Utility stores the necessary state to perform hash and signature
// verification operations.
type Utility struct {
int *C.OlmUtility
mem []byte
}
// utilitySize returns the size of a utility object in bytes.
func utilitySize() uint {
return uint(C.olm_utility_size())
}
// sha256Len returns the length of the buffer needed to hold the SHA-256 hash.
func (u *Utility) sha256Len() uint {
return uint(C.olm_sha256_length((*C.OlmUtility)(u.int)))
}
// lastError returns an error describing the most recent error to happen to a
// utility.
func (u *Utility) lastError() error {
return convertError(C.GoString(C.olm_utility_last_error((*C.OlmUtility)(u.int))))
}
// Clear clears the memory used to back this utility.
func (u *Utility) Clear() error {
r := C.olm_clear_utility((*C.OlmUtility)(u.int))
if r == errorVal() {
return u.lastError()
}
return nil
}
// NewUtility creates a new utility.
func NewUtility() *Utility {
memory := make([]byte, utilitySize())
return &Utility{
int: C.olm_utility(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// Sha256 calculates the SHA-256 hash of the input and encodes it as base64.
func (u *Utility) Sha256(input string) string {
if len(input) == 0 {
panic(EmptyInput)
}
output := make([]byte, u.sha256Len())
r := C.olm_sha256(
(*C.OlmUtility)(u.int),
unsafe.Pointer(&([]byte(input)[0])),
C.size_t(len(input)),
unsafe.Pointer(&(output[0])),
C.size_t(len(output)))
if r == errorVal() {
panic(u.lastError())
}
return string(output)
}
// VerifySignature verifies an ed25519 signature. Returns true if the verification
// suceeds or false otherwise. Returns error on failure. If the key was too
// small then the error will be "INVALID_BASE64".
func (u *Utility) VerifySignature(message string, key id.Ed25519, signature string) (ok bool, err error) {
if len(message) == 0 || len(key) == 0 || len(signature) == 0 {
return false, EmptyInput
}
r := C.olm_ed25519_verify(
(*C.OlmUtility)(u.int),
unsafe.Pointer(&([]byte(key)[0])),
C.size_t(len(key)),
unsafe.Pointer(&([]byte(message)[0])),
C.size_t(len(message)),
unsafe.Pointer(&([]byte(signature)[0])),
C.size_t(len(signature)))
if r == errorVal() {
err = u.lastError()
if err == BadMessageMAC {
err = nil
}
} else {
ok = true
}
return ok, err
}
// VerifySignatureJSON verifies the signature in the JSON object _obj following
// the Matrix specification:
// https://matrix.org/speculator/spec/drafts%2Fe2e/appendices.html#signing-json
// If the _obj is a struct, the `json` tags will be honored.
func (u *Utility) VerifySignatureJSON(obj interface{}, userID id.UserID, keyName string, key id.Ed25519) (bool, error) {
objJSON, err := json.Marshal(obj)
if err != nil {
return false, err
}
sig := gjson.GetBytes(objJSON, util.GJSONPath("signatures", string(userID), fmt.Sprintf("ed25519:%s", keyName)))
if !sig.Exists() || sig.Type != gjson.String {
return false, SignatureNotFound
}
objJSON, err = sjson.DeleteBytes(objJSON, "unsigned")
if err != nil {
return false, err
}
objJSON, err = sjson.DeleteBytes(objJSON, "signatures")
if err != nil {
return false, err
}
objJSONString := string(canonicaljson.CanonicalJSONAssumeValid(objJSON))
return u.VerifySignature(objJSONString, key, sig.Str)
}
// VerifySignatureJSON verifies the signature in the JSON object _obj following
// the Matrix specification:
// https://matrix.org/speculator/spec/drafts%2Fe2e/appendices.html#signing-json
// This function is a wrapper over Utility.VerifySignatureJSON that creates and
// destroys the Utility object transparently.
// If the _obj is a struct, the `json` tags will be honored.
func VerifySignatureJSON(obj interface{}, userID id.UserID, keyName string, key id.Ed25519) (bool, error) {
u := NewUtility()
defer u.Clear()
return u.VerifySignatureJSON(obj, userID, keyName, key)
}

143
vendor/maunium.net/go/mautrix/crypto/olm/verification.go generated vendored Normal file
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@@ -0,0 +1,143 @@
//go:build !nosas
// +build !nosas
package olm
// #cgo LDFLAGS: -lolm -lstdc++
// #include <olm/olm.h>
// #include <olm/sas.h>
import "C"
import (
"crypto/rand"
"unsafe"
)
// SAS stores an Olm Short Authentication String (SAS) object.
type SAS struct {
int *C.OlmSAS
mem []byte
}
// NewBlankSAS initializes an empty SAS object.
func NewBlankSAS() *SAS {
memory := make([]byte, sasSize())
return &SAS{
int: C.olm_sas(unsafe.Pointer(&memory[0])),
mem: memory,
}
}
// sasSize is the size of a SAS object in bytes.
func sasSize() uint {
return uint(C.olm_sas_size())
}
// sasRandomLength is the number of random bytes needed to create an SAS object.
func (sas *SAS) sasRandomLength() uint {
return uint(C.olm_create_sas_random_length(sas.int))
}
// NewSAS creates a new SAS object.
func NewSAS() *SAS {
sas := NewBlankSAS()
random := make([]byte, sas.sasRandomLength()+1)
_, err := rand.Read(random)
if err != nil {
panic(NotEnoughGoRandom)
}
r := C.olm_create_sas(
(*C.OlmSAS)(sas.int),
unsafe.Pointer(&random[0]),
C.size_t(len(random)))
if r == errorVal() {
panic(sas.lastError())
} else {
return sas
}
}
// clear clears the memory used to back an SAS object.
func (sas *SAS) clear() uint {
return uint(C.olm_clear_sas(sas.int))
}
// lastError returns the most recent error to happen to an SAS object.
func (sas *SAS) lastError() error {
return convertError(C.GoString(C.olm_sas_last_error(sas.int)))
}
// pubkeyLength is the size of a public key in bytes.
func (sas *SAS) pubkeyLength() uint {
return uint(C.olm_sas_pubkey_length((*C.OlmSAS)(sas.int)))
}
// GetPubkey gets the public key for the SAS object.
func (sas *SAS) GetPubkey() []byte {
pubkey := make([]byte, sas.pubkeyLength())
r := C.olm_sas_get_pubkey(
(*C.OlmSAS)(sas.int),
unsafe.Pointer(&pubkey[0]),
C.size_t(len(pubkey)))
if r == errorVal() {
panic(sas.lastError())
}
return pubkey
}
// SetTheirKey sets the public key of the other user.
func (sas *SAS) SetTheirKey(theirKey []byte) error {
theirKeyCopy := make([]byte, len(theirKey))
copy(theirKeyCopy, theirKey)
r := C.olm_sas_set_their_key(
(*C.OlmSAS)(sas.int),
unsafe.Pointer(&theirKeyCopy[0]),
C.size_t(len(theirKeyCopy)))
if r == errorVal() {
return sas.lastError()
}
return nil
}
// GenerateBytes generates bytes to use for the short authentication string.
func (sas *SAS) GenerateBytes(info []byte, count uint) ([]byte, error) {
infoCopy := make([]byte, len(info))
copy(infoCopy, info)
output := make([]byte, count)
r := C.olm_sas_generate_bytes(
(*C.OlmSAS)(sas.int),
unsafe.Pointer(&infoCopy[0]),
C.size_t(len(infoCopy)),
unsafe.Pointer(&output[0]),
C.size_t(len(output)))
if r == errorVal() {
return nil, sas.lastError()
}
return output, nil
}
// macLength is the size of a message authentication code generated by olm_sas_calculate_mac.
func (sas *SAS) macLength() uint {
return uint(C.olm_sas_mac_length((*C.OlmSAS)(sas.int)))
}
// CalculateMAC generates a message authentication code (MAC) based on the shared secret.
func (sas *SAS) CalculateMAC(input []byte, info []byte) ([]byte, error) {
inputCopy := make([]byte, len(input))
copy(inputCopy, input)
infoCopy := make([]byte, len(info))
copy(infoCopy, info)
mac := make([]byte, sas.macLength())
r := C.olm_sas_calculate_mac(
(*C.OlmSAS)(sas.int),
unsafe.Pointer(&inputCopy[0]),
C.size_t(len(inputCopy)),
unsafe.Pointer(&infoCopy[0]),
C.size_t(len(infoCopy)),
unsafe.Pointer(&mac[0]),
C.size_t(len(mac)))
if r == errorVal() {
return nil, sas.lastError()
}
return mac, nil
}