+#include <arpa/inet.h>
#include <string.h>
#include <openssl/evp.h>
+#include <openssl/hmac.h>
#include "gost_lcl.h"
#include "e_gost_err.h"
* */
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)
{
unsigned char iv_full[16], mac_buf[16];
unsigned int mac_len;
}
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
return ret;
}
+/*
+ * Function expects that shared_key is a preallocated buffer
+ * with length defined as expkeylen + mac_len defined by mac_nid
+ * */
int gost_kimp15(const unsigned char *expkey, const size_t expkeylen,
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,
+ int mac_nid, unsigned char *mac_key,
const unsigned char *iv, const size_t ivlen,
- unsigned char *shared_key, size_t shared_len)
+ unsigned char *shared_key)
{
unsigned char iv_full[16], out[48], mac_buf[16];
unsigned int mac_len;
+ const size_t shared_len = 32;
EVP_CIPHER_CTX *ciph = NULL;
EVP_MD_CTX *mac = NULL;
ciph = EVP_CIPHER_CTX_new();
if (ciph == NULL) {
- GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
+ GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
goto err;
}
mac = EVP_MD_CTX_new();
if (mac == NULL) {
- GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
+ GOSTerr(GOST_F_GOST_KIMP15, 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, 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, out, shared_len) <= 0
return ret;
}
-/*
- * keyout expected to be 64 bytes
- * */
-int gost_keg(const unsigned char *seckey, const size_t seckey_len,
- const EC_POINT *pub, const unsigned char *h, unsigned char *keyout)
-{
- return 0;
-}
-
-#ifdef ENABLE_UNIT_TESTS
-# include <stdio.h>
-# include <string.h>
-# include <openssl/obj_mac.h>
-
-static void hexdump(FILE *f, const char *title, const unsigned char *s, int l)
+int gost_kdftree2012_256(unsigned char *keyout, size_t keyout_len,
+ const unsigned char *key, size_t keylen,
+ const unsigned char *label, size_t label_len,
+ const unsigned char *seed, size_t seed_len,
+ const size_t representation)
{
- int n = 0;
-
- fprintf(f, "%s", title);
- for (; n < l; ++n) {
- if ((n % 16) == 0)
- fprintf(f, "\n%04x", n);
- fprintf(f, " %02x", s[n]);
+ int iters, i = 0;
+ unsigned char zero = 0;
+ unsigned char *ptr = keyout;
+ HMAC_CTX *ctx = NULL;
+ unsigned char *len_ptr = NULL;
+ uint32_t len_repr = htonl(keyout_len * 8);
+ size_t len_repr_len = 4;
+
+ ctx = HMAC_CTX_new();
+ if (ctx == NULL) {
+ GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_MALLOC_FAILURE);
+ return 0;
}
- fprintf(f, "\n");
-}
-int main(void)
-{
- 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,
- 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF
- };
-
- const unsigned char magma_key[] = {
- 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
- 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
- 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
- 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
- };
-
- unsigned char mac_magma_key[] = {
- 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
- 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
- 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
- 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
- };
-
- 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,
- 0x5D, 0xAF, 0xE7, 0xB4, 0x2E, 0x3A, 0x8B, 0xD9
- };
-
- unsigned char buf[32 + 16];
- int ret = 0;
- int outlen = 40;
-
- OpenSSL_add_all_algorithms();
- memset(buf, 0, sizeof(buf));
-
- ret = gost_kexp15(shared_key, 32,
- NID_magma_ctr, magma_key, 32,
- NID_magma_mac, mac_magma_key, 32,
- magma_iv, 4, buf, &outlen);
-
- if (ret <= 0)
- ERR_print_errors_fp(stderr);
- else {
- hexdump(stdout, "Magma key export", buf, 40);
- if (memcmp(buf, magma_export, 40) != 0) {
- fprintf(stdout, "ERROR! test failed\n");
- }
+ if ((keyout_len == 0) || (keyout_len % 32 != 0)) {
+ GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
+ return 0;
}
+ iters = keyout_len / 32;
- ret = gost_kimp15(magma_export, 40,
- NID_magma_ctr, magma_key, 32,
- NID_magma_mac, mac_magma_key, 32, magma_iv, 4, buf, 32);
+ len_ptr = (unsigned char *)&len_repr;
+ while (*len_ptr == 0) {
+ len_ptr++;
+ len_repr_len--;
+ }
- 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");
+ for (i = 1; i <= iters; i++) {
+ uint32_t iter_net = htonl(i);
+ unsigned char *rep_ptr =
+ ((unsigned char *)&iter_net) + (4 - representation);
+
+ if (HMAC_Init_ex(ctx, key, keylen,
+ EVP_get_digestbynid(NID_id_GostR3411_2012_256),
+ NULL) <= 0
+ || HMAC_Update(ctx, rep_ptr, representation) <= 0
+ || HMAC_Update(ctx, label, label_len) <= 0
+ || HMAC_Update(ctx, &zero, 1) <= 0
+ || HMAC_Update(ctx, seed, seed_len) <= 0
+ || HMAC_Update(ctx, len_ptr, len_repr_len) <= 0
+ || HMAC_Final(ctx, ptr, NULL) <= 0) {
+ GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
+ HMAC_CTX_free(ctx);
+ return 0;
}
+
+ HMAC_CTX_reset(ctx);
+ ptr += 32;
}
- return 0;
+ HMAC_CTX_free(ctx);
+
+ return 1;
}
+int gost_tlstree(int cipher_nid, const unsigned char *in, unsigned char *out,
+ const unsigned char *tlsseq)
+{
+#ifndef L_ENDIAN
+ uint64_t gh_c1 = 0xFFFFFFFF00000000, gh_c2 = 0xFFFFFFFFFFF80000,
+ gh_c3 = 0xFFFFFFFFFFFFFFC0;
+ uint64_t mg_c1 = 0xFFFFFFC000000000, mg_c2 = 0xFFFFFFFFFE000000,
+ mg_c3 = 0xFFFFFFFFFFFFF000;
+#else
+ uint64_t gh_c1 = 0x00000000FFFFFFFF, gh_c2 = 0x0000F8FFFFFFFFFF,
+ gh_c3 = 0xC0FFFFFFFFFFFFFF;
+ uint64_t mg_c1 = 0x00000000C0FFFFFF, mg_c2 = 0x000000FEFFFFFFFF,
+ mg_c3 = 0x00F0FFFFFFFFFFFF;
#endif
+ uint64_t c1, c2, c3;
+ uint64_t seed1, seed2, seed3;
+ uint64_t seq;
+ unsigned char ko1[32], ko2[32];
+
+ switch (cipher_nid) {
+ case NID_magma_cbc:
+ c1 = mg_c1;
+ c2 = mg_c2;
+ c3 = mg_c3;
+ break;
+ case NID_grasshopper_cbc:
+ c1 = gh_c1;
+ c2 = gh_c2;
+ c3 = gh_c3;
+ break;
+ default:
+ return 0;
+ }
+ memcpy(&seq, tlsseq, 8);
+ seed1 = seq & c1;
+ seed2 = seq & c2;
+ seed3 = seq & c3;
+
+ if (gost_kdftree2012_256(ko1, 32, in, 32, (const unsigned char *)"level1", 6,
+ (const unsigned char *)&seed1, 8, 1) <= 0
+ || gost_kdftree2012_256(ko2, 32, ko1, 32, (const unsigned char *)"level2", 6,
+ (const unsigned char *)&seed2, 8, 1) <= 0
+ || gost_kdftree2012_256(out, 32, ko2, 32, (const unsigned char *)"level3", 6,
+ (const unsigned char *)&seed3, 8, 1) <= 0)
+ return 0;
+
+ return 1;
+}