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crypto.c: add AES GCM 128 en/decryption

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This commit is contained in:
F. Duncanh
2023-11-23 20:31:23 -05:00
parent 44365fe59c
commit 60cfb19d90
2 changed files with 91 additions and 1 deletions
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81
lib/crypto.c
View File

@@ -262,6 +262,87 @@ void x25519_derive_secret(unsigned char secret[X25519_KEY_SIZE], const x25519_ke
EVP_PKEY_CTX_free(pctx);
}
// GCM AES 128
int gcm_encrypt(const unsigned char *plaintext, int plaintext_len, unsigned char *ciphertext,
unsigned char *key, unsigned char *iv, unsigned char *tag)
{
EVP_CIPHER_CTX *ctx;
int len;
int ciphertext_len;
if(!(ctx = EVP_CIPHER_CTX_new()))
handle_error(__func__);
if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_128_gcm(), NULL, NULL, NULL))
handle_error(__func__);
if(1 != EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL))
handle_error(__func__);
if(1 != EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv))
handle_error(__func__);
if(1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
handle_error(__func__);
ciphertext_len = len;
if(1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len))
handle_error(__func__);
ciphertext_len += len;
if(1 != EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, 16, tag))
handle_error(__func__);
EVP_CIPHER_CTX_free(ctx);
return ciphertext_len;
}
int gcm_decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *plaintext,
unsigned char *key, unsigned char *iv, unsigned char *tag)
{
EVP_CIPHER_CTX *ctx;
int len;
int plaintext_len;
int ret;
if(!(ctx = EVP_CIPHER_CTX_new()))
handle_error(__func__);
if(!EVP_DecryptInit_ex(ctx, EVP_aes_128_gcm(), NULL, NULL, NULL))
handle_error(__func__);
if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL))
handle_error(__func__);
if(!EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
handle_error(__func__);
if(!EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
handle_error(__func__);
plaintext_len = len;
if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, tag))
handle_error(__func__);
ret = EVP_DecryptFinal_ex(ctx, plaintext + len, &len);
EVP_CIPHER_CTX_free(ctx);
if(ret > 0) {
/* Success */
plaintext_len += len;
return plaintext_len;
} else {
/* Verify failed */
printf("failed\n");
return -1;
}
}
// ED25519
struct ed25519_key_s {

11
lib/crypto.h
View File

@@ -16,6 +16,8 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* modified by fduncanh 2023
*/
/*
@@ -64,9 +66,16 @@ x25519_key_t *x25519_key_generate(void);
x25519_key_t *x25519_key_from_raw(const unsigned char data[X25519_KEY_SIZE]);
void x25519_key_get_raw(unsigned char data[X25519_KEY_SIZE], const x25519_key_t *key);
void x25519_key_destroy(x25519_key_t *key);
int get_random_bytes(unsigned char *buf, int num);
void x25519_derive_secret(unsigned char secret[X25519_KEY_SIZE], const x25519_key_t *ours, const x25519_key_t *theirs);
// GCM AES 128
int gcm_encrypt(const unsigned char *plaintext, int plaintext_len, unsigned char *ciphertext,
unsigned char *key, unsigned char *iv, unsigned char *tag);
int gcm_decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *plaintext,
unsigned char *key, unsigned char *iv, unsigned char *tag);
// ED25519
#define ED25519_KEY_SIZE 32