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authorHubert Chathi <hubert@uhoreg.ca>2019-04-02 23:39:05 -0400
committerHubert Chathi <hubert@uhoreg.ca>2019-04-02 23:39:05 -0400
commit3148157ea4262082d957f45b36016c44f8e1415a (patch)
tree81f07c4df2935dec84ff1e8660cfdee8d9ce380a /src/sas.c
parentd5c0eb9d20a17ec596784f53f3c9ffab0e9ad772 (diff)
add support for an incorrect KDF that snuck into Riot 1.0
Diffstat (limited to 'src/sas.c')
-rw-r--r--src/sas.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/src/sas.c b/src/sas.c
index c5be73f..b5a3131 100644
--- a/src/sas.c
+++ b/src/sas.c
@@ -139,3 +139,26 @@ size_t olm_sas_calculate_mac(
_olm_encode_base64((const uint8_t *)mac, SHA256_OUTPUT_LENGTH, (uint8_t *)mac);
return 0;
}
+
+// for compatibility with an old version of Riot
+size_t olm_sas_calculate_mac_long_kdf(
+ OlmSAS * sas,
+ void * input, size_t input_length,
+ const void * info, size_t info_length,
+ void * mac, size_t mac_length
+) {
+ if (mac_length < olm_sas_mac_length(sas)) {
+ sas->last_error = OLM_OUTPUT_BUFFER_TOO_SMALL;
+ return (size_t)-1;
+ }
+ uint8_t key[256];
+ _olm_crypto_hkdf_sha256(
+ sas->secret, sizeof(sas->secret),
+ NULL, 0,
+ (const uint8_t *) info, info_length,
+ key, 256
+ );
+ _olm_crypto_hmac_sha256(key, 256, input, input_length, mac);
+ _olm_encode_base64((const uint8_t *)mac, SHA256_OUTPUT_LENGTH, (uint8_t *)mac);
+ return 0;
+}