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authorRichard van der Hoff <richard@matrix.org>2016-05-24 13:33:33 +0100
committerRichard van der Hoff <richard@matrix.org>2016-05-24 13:33:33 +0100
commit2e7800cf650197f4b8998ef8ac24d08daa316a2f (patch)
tree1f9e5e06b755f929c7bad363b77eaafdd21d706c /src/cipher.cpp
parentb1c5732fc8c89ee9217d0f54408f860565fa01f4 (diff)
parent2fd28a66824bda7b86c08b065736009c39761987 (diff)
Merge branch 'rav/c_bindings'
Diffstat (limited to 'src/cipher.cpp')
-rw-r--r--src/cipher.cpp89
1 files changed, 46 insertions, 43 deletions
diff --git a/src/cipher.cpp b/src/cipher.cpp
index 7bb11b8..8c3de92 100644
--- a/src/cipher.cpp
+++ b/src/cipher.cpp
@@ -12,15 +12,11 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-#include "olm/cipher.hh"
+#include "olm/cipher.h"
#include "olm/crypto.hh"
#include "olm/memory.hh"
#include <cstring>
-olm::Cipher::~Cipher() {
-
-}
-
namespace {
struct DerivedKeys {
@@ -36,7 +32,7 @@ static void derive_keys(
DerivedKeys & keys
) {
std::uint8_t derived_secrets[2 * olm::KEY_LENGTH + olm::IV_LENGTH];
- olm::hkdf_sha256(
+ _olm_crypto_hkdf_sha256(
key, key_length,
nullptr, 0,
kdf_info, kdf_info_length,
@@ -51,47 +47,40 @@ static void derive_keys(
static const std::size_t MAC_LENGTH = 8;
-} // namespace
-
-
-olm::CipherAesSha256::CipherAesSha256(
- std::uint8_t const * kdf_info, std::size_t kdf_info_length
-) : kdf_info(kdf_info), kdf_info_length(kdf_info_length) {
-
-}
-
-
-std::size_t olm::CipherAesSha256::mac_length() const {
+size_t aes_sha_256_cipher_mac_length(const struct _olm_cipher *cipher) {
return MAC_LENGTH;
}
-
-std::size_t olm::CipherAesSha256::encrypt_ciphertext_length(
- std::size_t plaintext_length
-) const {
+size_t aes_sha_256_cipher_encrypt_ciphertext_length(
+ const struct _olm_cipher *cipher, size_t plaintext_length
+) {
return olm::aes_encrypt_cbc_length(plaintext_length);
}
+size_t aes_sha_256_cipher_encrypt(
+ const struct _olm_cipher *cipher,
+ uint8_t const * key, size_t key_length,
+ uint8_t const * plaintext, size_t plaintext_length,
+ uint8_t * ciphertext, size_t ciphertext_length,
+ uint8_t * output, size_t output_length
+) {
+ auto *c = reinterpret_cast<const _olm_cipher_aes_sha_256 *>(cipher);
-std::size_t olm::CipherAesSha256::encrypt(
- std::uint8_t const * key, std::size_t key_length,
- std::uint8_t const * plaintext, std::size_t plaintext_length,
- std::uint8_t * ciphertext, std::size_t ciphertext_length,
- std::uint8_t * output, std::size_t output_length
-) const {
- if (encrypt_ciphertext_length(plaintext_length) < ciphertext_length) {
+ if (aes_sha_256_cipher_encrypt_ciphertext_length(cipher, plaintext_length)
+ < ciphertext_length) {
return std::size_t(-1);
}
+
struct DerivedKeys keys;
- std::uint8_t mac[olm::SHA256_OUTPUT_LENGTH];
+ std::uint8_t mac[SHA256_OUTPUT_LENGTH];
- derive_keys(kdf_info, kdf_info_length, key, key_length, keys);
+ derive_keys(c->kdf_info, c->kdf_info_length, key, key_length, keys);
olm::aes_encrypt_cbc(
keys.aes_key, keys.aes_iv, plaintext, plaintext_length, ciphertext
);
- olm::hmac_sha256(
+ _olm_crypto_hmac_sha256(
keys.mac_key, olm::KEY_LENGTH, output, output_length - MAC_LENGTH, mac
);
@@ -102,24 +91,28 @@ std::size_t olm::CipherAesSha256::encrypt(
}
-std::size_t olm::CipherAesSha256::decrypt_max_plaintext_length(
- std::size_t ciphertext_length
-) const {
+size_t aes_sha_256_cipher_decrypt_max_plaintext_length(
+ const struct _olm_cipher *cipher,
+ size_t ciphertext_length
+) {
return ciphertext_length;
}
-std::size_t olm::CipherAesSha256::decrypt(
- std::uint8_t const * key, std::size_t key_length,
- std::uint8_t const * input, std::size_t input_length,
- std::uint8_t const * ciphertext, std::size_t ciphertext_length,
- std::uint8_t * plaintext, std::size_t max_plaintext_length
-) const {
+size_t aes_sha_256_cipher_decrypt(
+ const struct _olm_cipher *cipher,
+ uint8_t const * key, size_t key_length,
+ uint8_t const * input, size_t input_length,
+ uint8_t const * ciphertext, size_t ciphertext_length,
+ uint8_t * plaintext, size_t max_plaintext_length
+) {
+ auto *c = reinterpret_cast<const _olm_cipher_aes_sha_256 *>(cipher);
+
DerivedKeys keys;
- std::uint8_t mac[olm::SHA256_OUTPUT_LENGTH];
+ std::uint8_t mac[SHA256_OUTPUT_LENGTH];
- derive_keys(kdf_info, kdf_info_length, key, key_length, keys);
+ derive_keys(c->kdf_info, c->kdf_info_length, key, key_length, keys);
- olm::hmac_sha256(
+ _olm_crypto_hmac_sha256(
keys.mac_key, olm::KEY_LENGTH, input, input_length - MAC_LENGTH, mac
);
@@ -136,3 +129,13 @@ std::size_t olm::CipherAesSha256::decrypt(
olm::unset(keys);
return plaintext_length;
}
+
+} // namespace
+
+const struct _olm_cipher_ops _olm_cipher_aes_sha_256_ops = {
+ aes_sha_256_cipher_mac_length,
+ aes_sha_256_cipher_encrypt_ciphertext_length,
+ aes_sha_256_cipher_encrypt,
+ aes_sha_256_cipher_decrypt_max_plaintext_length,
+ aes_sha_256_cipher_decrypt,
+};