* This file is distributed under the same license as OpenSSL *
* *
* Implements generation and parsing of GOST_KEY_TRANSPORT for *
- * GOST R 34.10-94 algorithms *
- * *
+ * GOST R 34.10-94 algorithms *
+ * *
* Requires OpenSSL 0.9.9 for compilation *
**********************************************************************/
#include <string.h>
#include <openssl/dh.h>
#include <openssl/rand.h>
+#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include "gost_keywrap.h"
#include "gost_lcl.h"
/* Common functions for both 94 and 2001 key exchange schemes */
-int decrypt_cryptocom_key(unsigned char *sess_key,int max_key_len,
- const unsigned char *crypted_key,int crypted_key_len, gost_ctx *ctx)
- {
- int i;
- int j;
- int blocks = crypted_key_len >>3;
- unsigned char gamma[8];
- if (max_key_len <crypted_key_len)
- {
- GOSTerr(GOST_F_DECRYPT_CRYPTOCOM_KEY,GOST_R_NOT_ENOUGH_SPACE_FOR_KEY);
- return 0;
- }
- if ((crypted_key_len & 7) !=0)
- {
- GOSTerr(GOST_F_DECRYPT_CRYPTOCOM_KEY,GOST_R_INVALID_ENCRYPTED_KEY_SIZE);
- return 0;
- }
- for (i=blocks-1;i>0;i--)
- {
- gostcrypt(ctx,crypted_key+(i-1)*8,gamma);
- for(j=0;j<8;j++)
- {
- sess_key[i*8+j]=gamma[j]^crypted_key[i*8+j];
- }
- }
- gostcrypt(ctx,sess_key+crypted_key_len-8,gamma);
- for(j=0;j<8;j++)
- {
- sess_key[j]=gamma[j]^crypted_key[j];
- }
- return 1;
- }
-int encrypt_cryptocom_key(const unsigned char *sess_key,int key_len,
- unsigned char *crypted_key, gost_ctx *ctx)
- {
- int i;
- int j;
- unsigned char gamma[8];
- memcpy(gamma,sess_key+key_len-8,8);
- for (i=0;i<key_len;i+=8)
- {
- gostcrypt(ctx,gamma,gamma);
- for (j=0;j<8;j++)
- gamma[j]=crypted_key[i+j]=sess_key[i+j]^gamma[j];
- }
- return 1;
- }
-/* Implementation of the Diffi-Hellman key agreement scheme based on
- * GOST-94 keys */
-
-/* Computes Diffie-Hellman key and stores it into buffer in
- * little-endian byte order as expected by both versions of GOST 94
- * algorigthm
- */
-static int compute_pair_key_le(unsigned char *pair_key,BIGNUM *pub_key,DH *dh)
- {
- unsigned char be_key[128];
- int i,key_size;
- key_size=DH_compute_key(be_key,pub_key,dh);
- if (!key_size) return 0;
- memset(pair_key,0,128);
- for (i=0;i<key_size;i++)
- {
- pair_key[i]=be_key[key_size-1-i];
- }
- return key_size;
- }
/*
- * Computes 256 bit key exchange key for CryptoCom variation of GOST 94
- * algorithm
+ * Implementation of the Diffi-Hellman key agreement scheme based on GOST-94
+ * keys
*/
-static int make_gost_shared_key(DH *dh,EVP_PKEY *pubk,unsigned char *shared_key)
- {
- unsigned char dh_key [128];
- int i;
- /* Compute key */
- memset(dh_key,0,128);
- if (!compute_pair_key_le(dh_key,((DSA *)EVP_PKEY_get0(pubk))->pub_key,dh)) return 0;
- /* Fold it down to 256 bit */
- /* According to GOST either 2^1020<p<2^1024 or
- * 2^509<p<2^512, so DH_size can be exactly 128 or exactly 64 only
- */
-
- if (DH_size(dh)==128)
- {
- for (i=0;i<64;i++)
- {
- dh_key[i]^=dh_key[64+i];
- }
- }
- for (i=0;i<32;i++)
- {
- shared_key[i]=dh_key[i]^dh_key[32+i];
- }
- return 1;
- }
-static DH *make_ephemeral_key(EVP_PKEY *pubk,BIGNUM *ephemeral_key)
- {
- DH *dh = DH_new();
- dh->g = BN_dup(pubk->pkey.dsa->g);
- dh->p = BN_dup(pubk->pkey.dsa->p);
- dh->priv_key = BN_dup(ephemeral_key);
- /* Generate ephemeral key pair */
- if (!DH_generate_key(dh))
- {
- DH_free(dh);
- return NULL;
- }
- return dh;
- }
/*
- * Computes 256 bit Key exchange key as specified in RFC 4357
+ * Computes Diffie-Hellman key and stores it into buffer in little-endian
+ * byte order as expected by both versions of GOST 94 algorithm
*/
-static int make_cp_exchange_key(DH *dh,EVP_PKEY *pubk, unsigned char *shared_key)
- {
- unsigned char dh_key [128];
- gost_hash_ctx hash_ctx;
- memset(dh_key,0,128);
- if (!compute_pair_key_le(dh_key,((DSA *)(EVP_PKEY_get0(pubk)))->pub_key,dh)) return 0;
- init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
- start_hash(&hash_ctx);
- hash_block(&hash_ctx,dh_key,128);
- finish_hash(&hash_ctx,shared_key);
- done_gost_hash_ctx(&hash_ctx);
- return 1;
- }
+static int compute_pair_key_le(unsigned char *pair_key, BIGNUM *pub_key,
+ DH *dh)
+{
+ unsigned char be_key[128];
+ int i, key_size;
+ key_size = DH_compute_key(be_key, pub_key, dh);
+ if (!key_size)
+ return 0;
+ memset(pair_key, 0, 128);
+ for (i = 0; i < key_size; i++) {
+ pair_key[i] = be_key[key_size - 1 - i];
+ }
+ return key_size;
+}
-/* EVP_PKEY_METHOD callback encrypt for
- * GOST R 34.10-94 cryptopro modification
+/*
+ * Computes 256 bit Key exchange key as specified in RFC 4357
*/
+static int make_cp_exchange_key(BIGNUM *priv_key, EVP_PKEY *pubk,
+ unsigned char *shared_key)
+{
+ unsigned char dh_key[128];
+ int ret;
+ gost_hash_ctx hash_ctx;
+ DH *dh = DH_new();
-int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, const unsigned char* key, size_t key_len )
- {
- GOST_KEY_TRANSPORT *gkt=NULL;
- DH *dh = NULL;
- unsigned char shared_key[32], ukm[8],crypted_key[44];
- const struct gost_cipher_info *param=get_encryption_params(NULL);
- EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
- struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
- int size=-1;
- gost_ctx cctx;
+ if (!dh)
+ return 0;
+ memset(dh_key, 0, 128);
+ dh->g = BN_dup(pubk->pkey.dsa->g);
+ dh->p = BN_dup(pubk->pkey.dsa->p);
+ dh->priv_key = BN_dup(priv_key);
+ ret =
+ compute_pair_key_le(dh_key, ((DSA *)(EVP_PKEY_get0(pubk)))->pub_key,
+ dh);
+ DH_free(dh);
+ if (!ret)
+ return 0;
+ init_gost_hash_ctx(&hash_ctx, &GostR3411_94_CryptoProParamSet);
+ start_hash(&hash_ctx);
+ hash_block(&hash_ctx, dh_key, 128);
+ finish_hash(&hash_ctx, shared_key);
+ done_gost_hash_ctx(&hash_ctx);
+ return 1;
+}
- if (!(data->eph_seckey))
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
- GOST_R_CTX_NOT_INITIALIZED_FOR_ENCRYPT);
- return -1;
- }
+/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */
- dh = make_ephemeral_key(pubk,gost_get_priv_key(data->eph_seckey));
- gost_init(&cctx,param->sblock);
- make_cp_exchange_key(dh,pubk,shared_key);
- if (RAND_bytes(ukm,8)<=0)
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
- GOST_R_RANDOM_GENERATOR_FAILURE);
- return -1;
- }
- keyWrapCryptoPro(&cctx,shared_key,ukm,key,crypted_key);
- gkt = GOST_KEY_TRANSPORT_new();
- if (!gkt)
- {
- goto memerr;
- }
- if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
- ukm,8))
- {
- goto memerr;
- }
- if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
- {
- goto memerr;
- }
- if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
- {
- goto memerr;
- }
- if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,data->eph_seckey))
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
- goto err;
- }
- ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
- gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
- *outlen = i2d_GOST_KEY_TRANSPORT(gkt,&out);
- if (!size)
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
- size=-1;
- }
- GOST_KEY_TRANSPORT_free(gkt);
- DH_free(dh);
- return 1;
- memerr:
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
- GOST_R_MALLOC_FAILURE);
- err:
- GOST_KEY_TRANSPORT_free(gkt);
- DH_free(dh);
- return -1;
- }
+int pkey_gost94_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
+{
+ EVP_PKEY *pubk = EVP_PKEY_CTX_get0_peerkey(ctx);
+ EVP_PKEY *mykey = EVP_PKEY_CTX_get0_pkey(ctx);
+ *keylen = 32;
+ if (key == NULL)
+ return 1;
-/* EVP_PKEY_METHOD callback encrypt for
- * GOST R 34.10-94 cryptocom modification
+ return make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, key);
+}
+
+/*
+ * EVP_PKEY_METHOD callback encrypt for GOST R 34.10-94 cryptopro
+ * modification
*/
-int pkey_GOST94cc_encrypt (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, const unsigned char * key,size_t key_len)
- {
- EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
- struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
- /* create DH structure filling parameters from passed pub_key */
- DH *dh = NULL;
- GOST_KEY_TRANSPORT *gkt = NULL;
- gost_ctx cctx;
- EVP_PKEY *newkey=NULL;
- unsigned char shared_key[32],encrypted_key[32],hmac[4],
- iv[8]={0,0,0,0,0,0,0,0};
+int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out,
+ size_t *outlen, const unsigned char *key,
+ size_t key_len)
+{
+ GOST_KEY_TRANSPORT *gkt = NULL;
+ unsigned char shared_key[32], ukm[8], crypted_key[44];
+ const struct gost_cipher_info *param = get_encryption_params(NULL);
+ EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
+ struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
+ gost_ctx cctx;
+ int key_is_ephemeral = 1;
+ int tmp_outlen;
+ EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx);
- if (! data->eph_seckey)
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
- GOST_R_CTX_NOT_INITIALIZED_FOR_ENCRYPT);
- return -1;
- }
- dh = make_ephemeral_key(pubk,gost_get_priv_key(data->eph_seckey));
- if (!dh) goto err;
- /* compute shared key */
- if (!make_gost_shared_key(dh,pubk,shared_key))
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_ERROR_COMPUTING_SHARED_KEY);
- goto err;
- }
- /* encrypt session key */
- gost_init(&cctx, &GostR3411_94_CryptoProParamSet);
- gost_key(&cctx,shared_key);
- encrypt_cryptocom_key(key,key_len,encrypted_key,&cctx);
- /* compute hmac of session key */
- if (!gost_mac(&cctx,32,key,32,hmac))
- {
- DH_free(dh);
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_ERROR_COMPUTING_MAC);
- return -1;
- }
- gkt = GOST_KEY_TRANSPORT_new();
- if (!gkt)
- {
- DH_free(dh);
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_NO_MEMORY);
- return -1;
- }
- /* Store IV which is always zero in our case */
- if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,iv,8))
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_ERROR_STORING_IV);
- goto err;
- }
- if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,hmac,4))
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_ERROR_STORING_MAC);
- goto err;
- }
- if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,encrypted_key,32))
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_ERROR_STORING_ENCRYPTED_KEY);
- goto err;
- }
- if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,data->eph_seckey))
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_ENCRYPT,GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
- goto err;
- }
- ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
- gkt->key_agreement_info->cipher = OBJ_nid2obj(NID_id_Gost28147_89_cc);
- *outlen = i2d_GOST_KEY_TRANSPORT(gkt,&out);
- err:
- if (gkt) GOST_KEY_TRANSPORT_free(gkt);
- if (dh) DH_free(dh);
- if (newkey) EVP_PKEY_free(newkey);
- return 1;
- }
-
-/* EVP_PLEY_METHOD callback decrypt for
- * GOST R 34.10-94 cryptopro modification
- */
-int pkey_GOST94cp_decrypt (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *key_len,const unsigned char *in, size_t in_len) {
- DH *dh = DH_new();
- const unsigned char *p = in;
- GOST_KEY_TRANSPORT *gkt = NULL;
- unsigned char wrappedKey[44];
- unsigned char sharedKey[32];
- gost_ctx cctx;
- const struct gost_cipher_info *param=NULL;
- EVP_PKEY *eph_key=NULL;
- EVP_PKEY *priv= EVP_PKEY_CTX_get0_pkey(ctx);
-
- if (!key)
- {
- *key_len = 32;
- return 1;
- }
-
- dh->g = BN_dup(priv->pkey.dsa->g);
- dh->p = BN_dup(priv->pkey.dsa->p);
- dh->priv_key = BN_dup(priv->pkey.dsa->priv_key);
- gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
- in_len);
- if (!gkt)
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
- DH_free(dh);
- return 0;
- }
- eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
- param = get_encryption_params(gkt->key_agreement_info->cipher);
- gost_init(&cctx,param->sblock);
- OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
- memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);
- OPENSSL_assert(gkt->key_info->encrypted_key->length==32);
- memcpy(wrappedKey+8,gkt->key_info->encrypted_key->data,32);
- OPENSSL_assert(gkt->key_info->imit->length==4);
- memcpy(wrappedKey+40,gkt->key_info->imit->data,4);
- make_cp_exchange_key(dh,eph_key,sharedKey);
- if (!keyUnwrapCryptoPro(&cctx,sharedKey,wrappedKey,key))
- {
- GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
- GOST_R_ERROR_COMPUTING_SHARED_KEY);
- goto err;
- }
-
- EVP_PKEY_free(eph_key);
- GOST_KEY_TRANSPORT_free(gkt);
- DH_free(dh);
- return 1;
-err:
- EVP_PKEY_free(eph_key);
- GOST_KEY_TRANSPORT_free(gkt);
- DH_free(dh);
- return -1;
- }
+ /* Do not use vizir cipher parameters with cryptopro */
+ if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS)
+ && param == gost_cipher_list) {
+ param = gost_cipher_list + 1;
+ }
-/* EVP_PKEY_METHOD callback decrypt for
- * GOST R 34.10-94 cryptocom modification
+ if (mykey) {
+ /* If key already set, it is not ephemeral */
+ key_is_ephemeral = 0;
+ if (!gost_get0_priv_key(mykey)) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
+ GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
+ goto err;
+ }
+ } else {
+ /* Otherwise generate ephemeral key */
+ key_is_ephemeral = 1;
+ if (out) {
+ mykey = EVP_PKEY_new();
+ EVP_PKEY_assign(mykey, EVP_PKEY_base_id(pubk), DSA_new());
+ EVP_PKEY_copy_parameters(mykey, pubk);
+ if (!gost_sign_keygen(EVP_PKEY_get0(mykey))) {
+ goto err;
+ }
+ }
+ }
+ if (out)
+ make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, shared_key);
+ if (data->shared_ukm) {
+ memcpy(ukm, data->shared_ukm, 8);
+ } else if (out) {
+ if (RAND_bytes(ukm, 8) <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
+ GOST_R_RANDOM_GENERATOR_FAILURE);
+ goto err;
+ }
+ }
+
+ if (out) {
+ gost_init(&cctx, param->sblock);
+ keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
+ }
+ gkt = GOST_KEY_TRANSPORT_new();
+ if (!gkt) {
+ goto memerr;
+ }
+ if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
+ goto memerr;
+ }
+ if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
+ goto memerr;
+ }
+ if (!ASN1_OCTET_STRING_set
+ (gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
+ goto memerr;
+ }
+ if (key_is_ephemeral) {
+ if (!X509_PUBKEY_set
+ (&gkt->key_agreement_info->ephem_key, out ? mykey : pubk)) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
+ GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
+ goto err;
+ }
+ if (out)
+ EVP_PKEY_free(mykey);
+ }
+ ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
+ gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
+ tmp_outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL);
+ if (tmp_outlen <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
+ GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
+ goto err;
+ }
+ *outlen = tmp_outlen;
+ if (!key_is_ephemeral) {
+ /* Set control "public key from client certificate used" */
+ if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <=
+ 0) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
+ goto err;
+ }
+ }
+ GOST_KEY_TRANSPORT_free(gkt);
+ return 1;
+ memerr:
+ if (key_is_ephemeral) {
+ EVP_PKEY_free(mykey);
+ }
+ GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, ERR_R_MALLOC_FAILURE);
+ err:
+ GOST_KEY_TRANSPORT_free(gkt);
+ return -1;
+}
+
+/*
+ * EVP_PLEY_METHOD callback decrypt for GOST R 34.10-94 cryptopro
+ * modification
*/
+int pkey_GOST94cp_decrypt(EVP_PKEY_CTX *ctx, unsigned char *key,
+ size_t *key_len, const unsigned char *in,
+ size_t in_len)
+{
+ const unsigned char *p = in;
+ GOST_KEY_TRANSPORT *gkt = NULL;
+ unsigned char wrappedKey[44];
+ unsigned char sharedKey[32];
+ gost_ctx cctx;
+ const struct gost_cipher_info *param = NULL;
+ EVP_PKEY *eph_key = NULL, *peerkey = NULL;
+ EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(ctx);
+
+ if (!key) {
+ *key_len = 32;
+ return 1;
+ }
+
+ gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
+ if (!gkt) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
+ GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
+ return 0;
+ }
+ eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
+ if (eph_key) {
+ if (EVP_PKEY_derive_set_peer(ctx, eph_key) <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
+ GOST_R_INCOMPATIBLE_PEER_KEY);
+ goto err;
+ }
+ } else {
+ /* Set control "public key from client certificate used" */
+ if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <=
+ 0) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, GOST_R_CTRL_CALL_FAILED);
+ goto err;
+ }
+ }
+ peerkey = EVP_PKEY_CTX_get0_peerkey(ctx);
+ if (!peerkey) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, GOST_R_NO_PEER_KEY);
+ goto err;
+ }
+
+ param = get_encryption_params(gkt->key_agreement_info->cipher);
+ if (!param) {
+ goto err;
+ }
+
+ gost_init(&cctx, param->sblock);
+ OPENSSL_assert(gkt->key_agreement_info->eph_iv->length == 8);
+ memcpy(wrappedKey, gkt->key_agreement_info->eph_iv->data, 8);
+ OPENSSL_assert(gkt->key_info->encrypted_key->length == 32);
+ memcpy(wrappedKey + 8, gkt->key_info->encrypted_key->data, 32);
+ OPENSSL_assert(gkt->key_info->imit->length == 4);
+ memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
+ make_cp_exchange_key(gost_get0_priv_key(priv), peerkey, sharedKey);
+ if (!keyUnwrapCryptoPro(&cctx, sharedKey, wrappedKey, key)) {
+ GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
+ GOST_R_ERROR_COMPUTING_SHARED_KEY);
+ goto err;
+ }
-int pkey_GOST94cc_decrypt (EVP_PKEY_CTX *pctx, unsigned char *key, size_t *key_len, const unsigned char *in, size_t in_len)
- {
- /* Form DH params from compute shared key */
- GOST_KEY_TRANSPORT *gkt = NULL;
- const unsigned char *p=in;
- unsigned char shared_key[32];
- unsigned char hmac[4],hmac_comp[4];
- unsigned char iv[8];
- int i;
- gost_ctx ctx;
- DH *dh = DH_new();
- EVP_PKEY *eph_key;
- EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
-
- if (!key)
- {
- *key_len = 32;
- return 1;
- }
- /* Construct DH structure from the our GOST private key */
- dh->g = BN_dup(priv->pkey.dsa->g);
- dh->p = BN_dup(priv->pkey.dsa->p);
- dh->priv_key = BN_dup(priv->pkey.dsa->priv_key);
- /* Parse passed octet string and find out public key, iv and HMAC*/
- gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
- in_len);
- if (!gkt)
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
- DH_free(dh);
- return 0;
- }
- eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
- /* Initialization vector is really ignored here */
- OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
- memcpy(iv,gkt->key_agreement_info->eph_iv->data,8);
- /* HMAC should be computed and checked */
- OPENSSL_assert(gkt->key_info->imit->length==4);
- memcpy(hmac,gkt->key_info->imit->data,4);
- /* Compute shared key */
- i=make_gost_shared_key(dh,eph_key,shared_key);
- EVP_PKEY_free(eph_key);
- DH_free(dh);
- if (!i)
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_DECRYPT,GOST_R_ERROR_COMPUTING_SHARED_KEY);
- GOST_KEY_TRANSPORT_free(gkt);
- return 0;
- }
- /* Decrypt session key */
- gost_init(&ctx, &GostR3411_94_CryptoProParamSet);
- gost_key(&ctx,shared_key);
-
- if (!decrypt_cryptocom_key(key,*key_len,gkt->key_info->encrypted_key->data,
- gkt->key_info->encrypted_key->length, &ctx))
- {
- GOST_KEY_TRANSPORT_free(gkt);
- return 0;
- }
- GOST_KEY_TRANSPORT_free(gkt);
- /* check HMAC of session key*/
- if (!gost_mac(&ctx,32,key,32,hmac_comp))
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_DECRYPT,GOST_R_ERROR_COMPUTING_MAC);
- return 0;
- }
- /* HMAC of session key is not correct */
- if (memcmp(hmac,hmac_comp,4)!=0)
- {
- GOSTerr(GOST_F_PKEY_GOST94CC_DECRYPT,GOST_R_SESSION_KEY_MAC_DOES_NOT_MATCH);
- return 0;
- }
- return 1;
- }
+ EVP_PKEY_free(eph_key);
+ GOST_KEY_TRANSPORT_free(gkt);
+ return 1;
+ err:
+ EVP_PKEY_free(eph_key);
+ GOST_KEY_TRANSPORT_free(gkt);
+ return -1;
+}
projects / openssl.git / blobdiff