/*
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
* the offset
*/
err_status_t aes_icm_openssl_set_iv (aes_icm_ctx_t *c, void *iv, int dir)
{
const EVP_CIPHER *evp;
v128_t *nonce = (v128_t*)iv;
debug_print(mod_aes_icm, "setting iv: %s", v128_hex_string(nonce));
v128_xor(&c->counter, &c->offset, nonce);
debug_print(mod_aes_icm, "set_counter: %s", v128_hex_string(&c->counter));
switch (c->key_size) {
case AES_256_KEYSIZE:
evp = EVP_aes_256_ctr();
break;
case AES_192_KEYSIZE:
evp = EVP_aes_192_ctr();
break;
case AES_128_KEYSIZE:
evp = EVP_aes_128_ctr();
break;
default:
return err_status_bad_param;
break;
}
if (!EVP_EncryptInit_ex(&c->ctx, evp,
NULL, c->key.v8, c->counter.v8)) {
return err_status_fail;
} else {
return err_status_ok;
}
}
err_status_t
aes_icm_set_iv(aes_icm_ctx_t *c, void *iv) {
v128_t *nonce = iv;
debug_print(mod_aes_icm,
"setting iv: %s", v128_hex_string(nonce));
v128_xor(&c->counter, &c->offset, nonce);
debug_print(mod_aes_icm,
"set_counter: %s", v128_hex_string(&c->counter));
/* indicate that the keystream_buffer is empty */
c->bytes_in_buffer = 0;
return err_status_ok;
}
static srtp_err_status_t srtp_aes_icm_set_iv (srtp_aes_icm_ctx_t *c, uint8_t *iv, int direction)
{
v128_t nonce;
/* set nonce (for alignment) */
v128_copy_octet_string(&nonce, iv);
debug_print(srtp_mod_aes_icm,
"setting iv: %s", v128_hex_string(&nonce));
v128_xor(&c->counter, &c->offset, &nonce);
debug_print(srtp_mod_aes_icm,
"set_counter: %s", v128_hex_string(&c->counter));
/* indicate that the keystream_buffer is empty */
c->bytes_in_buffer = 0;
return srtp_err_status_ok;
}
/*
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
* the offset
*/
static srtp_err_status_t srtp_aes_icm_openssl_set_iv (void *cv, uint8_t *iv, srtp_cipher_direction_t dir)
{
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
v128_t nonce;
/* set nonce (for alignment) */
v128_copy_octet_string(&nonce, iv);
debug_print(srtp_mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
v128_xor(&c->counter, &c->offset, &nonce);
debug_print(srtp_mod_aes_icm, "set_counter: %s", v128_hex_string(&c->counter));
if (!EVP_EncryptInit_ex(c->ctx, NULL,
NULL, NULL, c->counter.v8)) {
return srtp_err_status_fail;
} else {
return srtp_err_status_ok;
}
}
/*
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
* the offset
*/
err_status_t aes_icm_openssl_set_iv (aes_icm_ctx_t *c, void *iv, int dir)
{
const EVP_CIPHER *evp;
v128_t nonce;
/* set nonce (for alignment) */
v128_copy_octet_string(&nonce, iv);
debug_print(mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
v128_xor(&c->counter, &c->offset, &nonce);
debug_print(mod_aes_icm, "set_counter: %s", v128_hex_string(&c->counter));
switch (c->key_size) {
case AES_256_KEYSIZE:
evp = EVP_aes_256_ctr();
break;
#ifndef BORINGSSL
case AES_192_KEYSIZE:
evp = EVP_aes_192_ctr();
break;
#endif
case AES_128_KEYSIZE:
evp = EVP_aes_128_ctr();
break;
default:
return err_status_bad_param;
break;
}
if (!EVP_EncryptInit_ex(&c->ctx, evp,
NULL, c->key.v8, c->counter.v8)) {
return err_status_fail;
} else {
return err_status_ok;
}
}
