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-rw-r--r--src/cipher.cpp96
1 files changed, 58 insertions, 38 deletions
diff --git a/src/cipher.cpp b/src/cipher.cpp
index a550312..8c56efa 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 {
@@ -51,41 +47,34 @@ 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[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
@@ -102,22 +91,26 @@ 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[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);
crypto_hmac_sha256(
keys.mac_key, olm::KEY_LENGTH, input, input_length - MAC_LENGTH, mac
@@ -136,3 +129,30 @@ std::size_t olm::CipherAesSha256::decrypt(
olm::unset(keys);
return plaintext_length;
}
+
+
+void aes_sha_256_cipher_destruct(struct olm_cipher *cipher) {
+}
+
+
+const cipher_ops aes_sha_256_cipher_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,
+ aes_sha_256_cipher_destruct
+};
+
+} // namespace
+
+
+olm_cipher *olm_cipher_aes_sha_256_init(struct olm_cipher_aes_sha_256 *cipher,
+ uint8_t const * kdf_info,
+ size_t kdf_info_length)
+{
+ cipher->base_cipher.ops = &aes_sha_256_cipher_ops;
+ cipher->kdf_info = kdf_info;
+ cipher->kdf_info_length = kdf_info_length;
+ return &(cipher->base_cipher);
+}