* */
int gost_kexp15(const unsigned char *shared_key, const int shared_len,
int cipher_nid, const unsigned char *cipher_key,
- const size_t cipher_key_len, int mac_nid,
- unsigned char *mac_key, const size_t mac_key_len,
- const unsigned char *iv, const size_t ivlen, unsigned char *out,
- int *out_len)
+ int mac_nid, unsigned char *mac_key,
+ const unsigned char *iv, const size_t ivlen,
+ unsigned char *out, int *out_len)
{
- /* out_len = key_len + mac_len */
unsigned char iv_full[16], mac_buf[16];
unsigned int mac_len;
(cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
if (mac_len == 0) {
- GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
+ GOSTerr(GOST_F_GOST_KEXP15, GOST_R_INVALID_CIPHER);
goto err;
}
}
if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
- || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, mac_key_len, mac_key) <= 0
+ || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
|| EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_MAC_LEN, mac_len, NULL) <= 0
|| EVP_DigestUpdate(mac, iv, ivlen) <= 0
|| EVP_DigestUpdate(mac, shared_key, shared_len) <= 0
ret = 1;
err:
- /* TODO clear mac_buf */
+ OPENSSL_cleanse(mac_buf, mac_len);
EVP_MD_CTX_free(mac);
EVP_CIPHER_CTX_free(ciph);
return ret;
}
-int gost_kimp15(const char *expkey, const size_t expkeylen,
- int cipher_nid, const char *cipher_key,
- const size_t cipher_key_len, int mac_nid, const char *mac_key,
- const size_t mac_key_len, const char *iv, const size_t ivlen,
- char *shared_key, size_t *shared_len)
+int gost_kimp15(const unsigned char *expkey, const size_t expkeylen,
+ int cipher_nid, const unsigned char *cipher_key,
+ int mac_nid, unsigned char *mac_key,
+ const unsigned char *iv, const size_t ivlen,
+ unsigned char *shared_key, size_t shared_len)
{
- return 0;
+ unsigned char iv_full[16], out[48], mac_buf[16];
+ unsigned int mac_len;
+
+ EVP_CIPHER_CTX *ciph = NULL;
+ EVP_MD_CTX *mac = NULL;
+
+ int ret = 0;
+ int len;
+
+ mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
+ (cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
+
+ if (mac_len == 0) {
+ GOSTerr(GOST_F_GOST_KIMP15, GOST_R_INVALID_CIPHER);
+ goto err;
+ }
+
+ /* we expect IV of half length */
+ memset(iv_full, 0, 16);
+ memcpy(iv_full, iv, ivlen);
+
+ ciph = EVP_CIPHER_CTX_new();
+ if (ciph == NULL) {
+ GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (EVP_CipherInit_ex
+ (ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 0) <= 0
+ || EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 0) <= 0
+ || EVP_CipherUpdate(ciph, out, &len, expkey, expkeylen) <= 0
+ || EVP_CipherFinal_ex(ciph, out + len, &len) <= 0) {
+ GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ /*Now we have shared key and mac in out[] */
+
+ mac = EVP_MD_CTX_new();
+ if (mac == NULL) {
+ GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
+ || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
+ || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_MAC_LEN, mac_len, NULL) <= 0
+ || EVP_DigestUpdate(mac, iv, ivlen) <= 0
+ || EVP_DigestUpdate(mac, out, shared_len) <= 0
+ /* As we set MAC length directly, we should not allow overwriting it */
+ || EVP_DigestFinal_ex(mac, mac_buf, NULL) <= 0) {
+ GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ if (CRYPTO_memcmp(mac_buf, out + shared_len, mac_len) != 0) {
+ GOSTerr(GOST_F_GOST_KIMP15, GOST_R_BAD_MAC);
+ goto err;
+ }
+
+ memcpy(shared_key, out, shared_len);
+ ret = 1;
+
+ err:
+ OPENSSL_cleanse(out, sizeof(out));
+ EVP_MD_CTX_free(mac);
+ EVP_CIPHER_CTX_free(ciph);
+ return ret;
}
/*
int main(void)
{
- const unsigned char key[] = {
+ const unsigned char shared_key[] = {
0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF,
0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
const unsigned char magma_iv[] = { 0x67, 0xBE, 0xD6, 0x54 };
- const unsigned char magma_export[] =
- { 0xCF, 0xD5, 0xA1, 0x2D, 0x5B, 0x81, 0xB6, 0xE1, 0xE9, 0x9C, 0x91,
-0x6D, 0x07, 0x90, 0x0C, 0x6A,
- 0xC1, 0x27, 0x03, 0xFB, 0x3A, 0xBD, 0xED, 0x55, 0x56, 0x7B, 0xF3, 0x74,
- 0x2C, 0x89, 0x9C, 0x75,
+ const unsigned char magma_export[] = {
+ 0xCF, 0xD5, 0xA1, 0x2D, 0x5B, 0x81, 0xB6, 0xE1,
+ 0xE9, 0x9C, 0x91, 0x6D, 0x07, 0x90, 0x0C, 0x6A,
+ 0xC1, 0x27, 0x03, 0xFB, 0x3A, 0xBD, 0xED, 0x55,
+ 0x56, 0x7B, 0xF3, 0x74, 0x2C, 0x89, 0x9C, 0x75,
0x5D, 0xAF, 0xE7, 0xB4, 0x2E, 0x3A, 0x8B, 0xD9
};
OpenSSL_add_all_algorithms();
memset(buf, 0, sizeof(buf));
- ret = gost_kexp15(key, 32,
- NID_magma_ctr, magma_key, 32,
- NID_magma_mac, mac_magma_key, 32,
- magma_iv, 4, buf, &outlen);
+ ret = gost_kexp15(shared_key, 32,
+ NID_magma_ctr, magma_key,
+ NID_magma_mac, mac_magma_key, magma_iv, 4, buf, &outlen);
if (ret <= 0)
ERR_print_errors_fp(stderr);
}
}
+ ret = gost_kimp15(magma_export, 40,
+ NID_magma_ctr, magma_key,
+ NID_magma_mac, mac_magma_key, magma_iv, 4, buf, 32);
+
+ if (ret <= 0)
+ ERR_print_errors_fp(stderr);
+ else {
+ hexdump(stdout, "Magma key import", buf, 32);
+ if (memcmp(buf, shared_key, 32) != 0) {
+ fprintf(stdout, "ERROR! test failed\n");
+ }
+ }
+
return 0;
}
projects / openssl-gost / engine.git / blobdiff