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olm_pk_decrypt: Ensure inputs are of correct length.

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This commit is contained in:
Denis Kasak 2021-05-18 13:05:11 +02:00
parent 2f35e0bc61
commit ccc0d122ee
1 changed files with 27 additions and 4 deletions
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31
src/pk.cpp
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@ -73,11 +73,13 @@ size_t olm_pk_encryption_set_recipient_key (
OlmErrorCode::OLM_INPUT_BUFFER_TOO_SMALL;
return std::size_t(-1);
}
olm::decode_base64(
(const uint8_t*)key,
olm_pk_key_length(),
(uint8_t *)encryption->recipient_key.public_key
);
return 0;
}
@ -363,17 +365,38 @@ size_t olm_pk_decrypt(
return std::size_t(-1);
}
size_t raw_ciphertext_length = olm::decode_base64_length(ciphertext_length);
if (ephemeral_key_length != olm::encode_base64_length(CURVE25519_KEY_LENGTH)
|| mac_length != olm::encode_base64_length(MAC_LENGTH)
|| raw_ciphertext_length == std::size_t(-1)) {
decryption->last_error = OlmErrorCode::OLM_INVALID_BASE64;
return std::size_t(-1);
}
struct _olm_curve25519_public_key ephemeral;
olm::decode_base64(
(const uint8_t*)ephemeral_key, ephemeral_key_length,
(const uint8_t*)ephemeral_key,
olm::encode_base64_length(CURVE25519_KEY_LENGTH),
(uint8_t *)ephemeral.public_key
);
olm::SharedKey secret;
_olm_crypto_curve25519_shared_secret(&decryption->key_pair, &ephemeral, secret);
uint8_t raw_mac[MAC_LENGTH];
olm::decode_base64((const uint8_t*)mac, olm::encode_base64_length(MAC_LENGTH), raw_mac);
size_t raw_ciphertext_length = olm::decode_base64_length(ciphertext_length);
olm::decode_base64((const uint8_t *)ciphertext, ciphertext_length, (uint8_t *)ciphertext);
olm::decode_base64(
(const uint8_t *)mac,
olm::encode_base64_length(MAC_LENGTH),
raw_mac
);
olm::decode_base64(
(const uint8_t *)ciphertext,
ciphertext_length,
(uint8_t *)ciphertext
);
size_t result = _olm_cipher_aes_sha_256_ops.decrypt(
olm_pk_cipher,
secret, sizeof(secret),