#include "gost_lcl.h"
#include "gost2001_keyx.h"
-/* Transform ECDH shared key into little endian as required by Cryptocom
- * key exchange */
-static void *make_key_le(const void *in, size_t inlen, void *out, size_t *outlen)
- {
- const char* inbuf= in;
- char* outbuf= out;
- int i;
- if (*outlen < inlen)
- {
- return NULL;
- }
- for (i=0;i<inlen;i++)
- {
- outbuf[inlen-1-i]=inbuf[i];
- }
- *outlen = inlen;
- return out;
- }
+/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
+static int VKO_compute_key(unsigned char *shared_key, size_t shared_key_size,
+ const EC_POINT *pub_key, EC_KEY *priv_key,
+ const unsigned char *ukm)
+{
+ unsigned char ukm_be[8], databuf[64], hashbuf[64];
+ BIGNUM *UKM = NULL, *p = NULL, *order = NULL, *X = NULL, *Y = NULL;
+ const BIGNUM *key = EC_KEY_get0_private_key(priv_key);
+ EC_POINT *pnt = EC_POINT_new(EC_KEY_get0_group(priv_key));
+ int i;
+ gost_hash_ctx hash_ctx;
+ BN_CTX *ctx = BN_CTX_new();
-/* Create gost 2001 ephemeral key with same parameters as peer key */
-static EC_KEY *make_ec_ephemeral_key(EC_KEY *peer_key,BIGNUM *seckey)
- {
- EC_KEY *out = EC_KEY_new();
- EC_KEY_copy(out,peer_key);
- EC_KEY_set_private_key(out,seckey);
- gost2001_compute_public(out);
- return out;
- }
-/* Packs GOST elliptic curve key into EVP_PKEY setting same parameters
- * as in passed pubkey
- */
-static EVP_PKEY *ec_ephemeral_key_to_EVP(EVP_PKEY *pubk,int type,EC_KEY *ephemeral)
- {
- EVP_PKEY *newkey;
- newkey = EVP_PKEY_new();
- EVP_PKEY_assign(newkey,type,ephemeral);
- return newkey;
- }
+ for (i = 0; i < 8; i++) {
+ ukm_be[7 - i] = ukm[i];
+ }
+ BN_CTX_start(ctx);
+ UKM = getbnfrombuf(ukm_be, 8);
+ p = BN_CTX_get(ctx);
+ order = BN_CTX_get(ctx);
+ X = BN_CTX_get(ctx);
+ Y = BN_CTX_get(ctx);
+ EC_GROUP_get_order(EC_KEY_get0_group(priv_key), order, ctx);
+ BN_mod_mul(p, key, UKM, order, ctx);
+ EC_POINT_mul(EC_KEY_get0_group(priv_key), pnt, NULL, pub_key, p, ctx);
+ EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
+ pnt, X, Y, ctx);
+ /*
+ * Serialize elliptic curve point same way as we do it when saving key
+ */
+ store_bignum(Y, databuf, 32);
+ store_bignum(X, databuf + 32, 32);
+ /* And reverse byte order of whole buffer */
+ for (i = 0; i < 64; i++) {
+ hashbuf[63 - i] = databuf[i];
+ }
+ init_gost_hash_ctx(&hash_ctx, &GostR3411_94_CryptoProParamSet);
+ start_hash(&hash_ctx);
+ hash_block(&hash_ctx, hashbuf, 64);
+ finish_hash(&hash_ctx, shared_key);
+ done_gost_hash_ctx(&hash_ctx);
+ BN_free(UKM);
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ EC_POINT_free(pnt);
+ return 32;
+}
-/*
- * EVP_PKEY_METHOD callback encrypt
- * Implementation of GOST2001 key transport, cryptocom variation
+/*
+ * EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-2001
+ * algorithm
*/
+int pkey_gost2001_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
+ size_t *keylen)
+{
+ /*
+ * Public key of peer in the ctx field peerkey Our private key in the ctx
+ * pkey ukm is in the algorithm specific context data
+ */
+ EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
+ EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
+ struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
-int pkey_GOST01cc_encrypt (EVP_PKEY_CTX *pctx,unsigned char *out,
- size_t *out_len, const unsigned char *key,size_t key_len)
- {
- EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
- struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
- GOST_KEY_TRANSPORT *gkt = NULL;
- int ret=0;
- gost_ctx ctx;
- EC_KEY *ephemeral=NULL;
- const EC_POINT *pub_key_point=NULL;
- unsigned char shared_key[32],encrypted_key[32],hmac[4],
- iv[8]={0,0,0,0,0,0,0,0};
- ephemeral = make_ec_ephemeral_key(EVP_PKEY_get0(pubk), gost_get_priv_key(data->eph_seckey));
- if (!ephemeral) goto err;
- /* compute shared key */
- pub_key_point=EC_KEY_get0_public_key(EVP_PKEY_get0(pubk));
- if (!ECDH_compute_key(shared_key,32,pub_key_point,ephemeral,make_key_le))
- {
- GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_COMPUTING_SHARED_KEY);
- goto err;
- }
- /* encrypt session key */
- gost_init(&ctx, &GostR3411_94_CryptoProParamSet);
- gost_key(&ctx,shared_key);
- encrypt_cryptocom_key(key,key_len,encrypted_key,&ctx);
- /* compute hmac of session key */
- if (!gost_mac(&ctx,32,key,32,hmac))
- {
- GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_COMPUTING_MAC);
- return -1;
- }
- gkt = GOST_KEY_TRANSPORT_new();
- if (!gkt)
- {
- GOSTerr(GOST_F_PKEY_GOST01CC_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_GOST01CC_ENCRYPT,GOST_R_ERROR_STORING_IV);
- goto err;
- }
- if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,hmac,4))
- {
- GOSTerr(GOST_F_PKEY_GOST01CC_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_GOST01CC_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_GOST01CC_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);
- if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,&out))>0) ret = 1;
- ;
- err:
- if (gkt) GOST_KEY_TRANSPORT_free(gkt);
- return ret;
- }
-/*
- * EVP_PKEY_METHOD callback decrypt
- * Implementation of GOST2001 key transport, cryptocom variation
- */
-int pkey_GOST01cc_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 */
- EVP_PKEY *priv=EVP_PKEY_CTX_get0_pkey(pctx);
- 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;
- const EC_POINT *pub_key_point;
- EVP_PKEY *eph_key;
+ if (!data->shared_ukm) {
+ GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET);
+ return 0;
+ }
- if (!key)
- {
- *key_len = 32;
- return 1;
- }
- /* 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_GOST01CC_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
- 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 */
- pub_key_point=EC_KEY_get0_public_key(EVP_PKEY_get0(eph_key));
- i=ECDH_compute_key(shared_key,32,pub_key_point,EVP_PKEY_get0(priv),make_key_le);
- EVP_PKEY_free(eph_key);
- if (!i)
- {
- GOSTerr(GOST_F_PKEY_GOST01CC_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_GOST01CC_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_GOST01CC_DECRYPT,GOST_R_SESSION_KEY_MAC_DOES_NOT_MATCH);
- return 0;
- }
- return 1;
- }
+ if (key == NULL) {
+ *keylen = 32;
+ return 32;
+ }
-/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
-static int VKO_compute_key(unsigned char *shared_key,size_t shared_key_size,const EC_POINT *pub_key,EC_KEY *priv_key,const unsigned char *ukm)
- {
- unsigned char ukm_be[8],databuf[64],hashbuf[64];
- BIGNUM *UKM=NULL,*p=NULL,*order=NULL,*X=NULL,*Y=NULL;
- const BIGNUM* key=EC_KEY_get0_private_key(priv_key);
- EC_POINT *pnt=EC_POINT_new(EC_KEY_get0_group(priv_key));
- int i;
- gost_hash_ctx hash_ctx;
- BN_CTX *ctx = BN_CTX_new();
+ *keylen =
+ VKO_compute_key(key, 32,
+ EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
+ (EC_KEY *)EVP_PKEY_get0(my_key), data->shared_ukm);
+ return 1;
+}
- for (i=0;i<8;i++)
- {
- ukm_be[7-i]=ukm[i];
- }
- BN_CTX_start(ctx);
- UKM=getbnfrombuf(ukm_be,8);
- p=BN_CTX_get(ctx);
- order = BN_CTX_get(ctx);
- X=BN_CTX_get(ctx);
- Y=BN_CTX_get(ctx);
- EC_GROUP_get_order(EC_KEY_get0_group(priv_key),order,ctx);
- BN_mod_mul(p,key,UKM,order,ctx);
- EC_POINT_mul(EC_KEY_get0_group(priv_key),pnt,NULL,pub_key,p,ctx);
- EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
- pnt,X,Y,ctx);
- /*Serialize elliptic curve point same way as we do it when saving
- * key */
- store_bignum(Y,databuf,32);
- store_bignum(X,databuf+32,32);
- /* And reverse byte order of whole buffer */
- for (i=0;i<64;i++)
- {
- hashbuf[63-i]=databuf[i];
- }
- init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
- start_hash(&hash_ctx);
- hash_block(&hash_ctx,hashbuf,64);
- finish_hash(&hash_ctx,shared_key);
- done_gost_hash_ctx(&hash_ctx);
- BN_free(UKM);
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- EC_POINT_free(pnt);
- return 32;
- }
+/*
+ * EVP_PKEY_METHOD callback encrypt
+ * Implementation of GOST2001 key transport, cryptocom variation
+ */
+/*
+ * Generates ephemeral key based on pubk algorithm computes shared key using
+ * VKO and returns filled up GOST_KEY_TRANSPORT structure
+ */
-/* Generates ephemeral key based on pubk algorithm
- * computes shared key using VKO and returns filled up
- * GOST_KEY_TRANSPORT structure
+/*
+ * EVP_PKEY_METHOD callback encrypt
+ * Implementation of GOST2001 key transport, cryptopo variation
*/
-/* Public, because it would be needed in SSL implementation */
-GOST_KEY_TRANSPORT *make_rfc4490_keytransport_2001(EVP_PKEY *pubk,BIGNUM *eph_key,
- const unsigned char *key,size_t keylen, unsigned char *ukm,
- size_t ukm_len)
- {
- const struct gost_cipher_info *param=get_encryption_params(NULL);
- EC_KEY *ephemeral = NULL;
- GOST_KEY_TRANSPORT *gkt=NULL;
- const EC_POINT *pub_key_point = EC_KEY_get0_public_key(EVP_PKEY_get0(pubk));
- unsigned char shared_key[32],crypted_key[44];
- gost_ctx ctx;
- EVP_PKEY *newkey=NULL;
-
- /* 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;
- }
- ephemeral = make_ec_ephemeral_key(EVP_PKEY_get0(pubk),eph_key);
- VKO_compute_key(shared_key,32,pub_key_point,ephemeral,ukm);
- gost_init(&ctx,param->sblock);
- keyWrapCryptoPro(&ctx,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;
- }
- newkey = ec_ephemeral_key_to_EVP(pubk,NID_id_GostR3410_2001,ephemeral);
- if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,newkey))
- {
- GOSTerr(GOST_F_MAKE_RFC4490_KEYTRANSPORT_2001,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);
- EVP_PKEY_free(newkey);
- return gkt;
- memerr:
- GOSTerr(GOST_F_MAKE_RFC4490_KEYTRANSPORT_2001,
- GOST_R_MALLOC_FAILURE);
- err:
- GOST_KEY_TRANSPORT_free(gkt);
- return NULL;
- }
+int pkey_GOST01cp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
+ size_t *out_len, const unsigned char *key,
+ size_t key_len)
+{
+ GOST_KEY_TRANSPORT *gkt = NULL;
+ EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
+ struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
+ const struct gost_cipher_info *param = get_encryption_params(NULL);
+ unsigned char ukm[8], shared_key[32], crypted_key[44];
+ int ret = 0;
+ int key_is_ephemeral = 1;
+ gost_ctx cctx;
+ EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
+ if (data->shared_ukm) {
+ memcpy(ukm, data->shared_ukm, 8);
+ } else if (out) {
-/*
- * EVP_PKEY_METHOD callback encrypt
- * Implementation of GOST2001 key transport, cryptopo variation
- */
+ if (RAND_bytes(ukm, 8) <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
+ GOST_R_RANDOM_GENERATOR_FAILURE);
+ return 0;
+ }
+ }
+ /* Check for private key in the peer_key of context */
+ if (sec_key) {
+ key_is_ephemeral = 0;
+ if (!gost_get0_priv_key(sec_key)) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
+ GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
+ goto err;
+ }
+ } else {
+ key_is_ephemeral = 1;
+ if (out) {
+ sec_key = EVP_PKEY_new();
+ EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new());
+ EVP_PKEY_copy_parameters(sec_key, pubk);
+ if (!gost2001_keygen(EVP_PKEY_get0(sec_key))) {
+ goto err;
+ }
+ }
+ }
+ if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS)
+ && param == gost_cipher_list) {
+ param = gost_cipher_list + 1;
+ }
+ if (out) {
+ VKO_compute_key(shared_key, 32,
+ EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
+ EVP_PKEY_get0(sec_key), ukm);
+ gost_init(&cctx, param->sblock);
+ keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
+ }
+ gkt = GOST_KEY_TRANSPORT_new();
+ if (!gkt) {
+ goto err;
+ }
+ if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
+ goto err;
+ }
+ if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
+ goto err;
+ }
+ if (!ASN1_OCTET_STRING_set
+ (gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
+ goto err;
+ }
+ if (key_is_ephemeral) {
+ if (!X509_PUBKEY_set
+ (&gkt->key_agreement_info->ephem_key, out ? sec_key : pubk)) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_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);
+ if (key_is_ephemeral)
+ EVP_PKEY_free(sec_key);
+ if (!key_is_ephemeral) {
+ /* Set control "public key from client certificate used" */
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
+ <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
+ goto err;
+ }
+ }
+ if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL)) > 0)
+ ret = 1;
+ GOST_KEY_TRANSPORT_free(gkt);
+ return ret;
+ err:
+ if (key_is_ephemeral)
+ EVP_PKEY_free(sec_key);
+ GOST_KEY_TRANSPORT_free(gkt);
+ return -1;
+}
-int pkey_GOST01cp_encrypt (EVP_PKEY_CTX *pctx, unsigned char *out, size_t *out_len, const unsigned char *key,size_t key_len)
- {
- GOST_KEY_TRANSPORT *gkt=NULL;
- EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
- struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
- unsigned char ukm[8];
- int ret=0;
- if (RAND_bytes(ukm,8)<=0)
- {
- GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
- GOST_R_RANDOM_GENERATOR_FAILURE);
- return 0;
- }
-
- if (!(gkt=make_rfc4490_keytransport_2001(pubk,gost_get_priv_key(data->eph_seckey),key, key_len,ukm,8)))
- {
- goto err;
- }
- if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,&out))>0) ret =1;
- GOST_KEY_TRANSPORT_free(gkt);
- return ret;
- err:
- GOST_KEY_TRANSPORT_free(gkt);
- return -1;
- }
-/* Public, because it would be needed in SSL implementation */
-int decrypt_rfc4490_shared_key_2001(EVP_PKEY *priv,GOST_KEY_TRANSPORT *gkt,
- unsigned char *key_buf,int key_buf_len)
- {
- unsigned char wrappedKey[44];
- unsigned char sharedKey[32];
- gost_ctx ctx;
- const struct gost_cipher_info *param=NULL;
- EVP_PKEY *eph_key=NULL;
-
- eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
- param = get_encryption_params(gkt->key_agreement_info->cipher);
- gost_init(&ctx,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);
- VKO_compute_key(sharedKey,32,EC_KEY_get0_public_key(EVP_PKEY_get0(eph_key)),
- EVP_PKEY_get0(priv),wrappedKey);
- if (!keyUnwrapCryptoPro(&ctx,sharedKey,wrappedKey,key_buf))
- {
- GOSTerr(GOST_F_PKCS7_GOST94CP_KEY_TRANSPORT_DECRYPT,
- GOST_R_ERROR_COMPUTING_SHARED_KEY);
- goto err;
- }
-
- EVP_PKEY_free(eph_key);
- return 32;
- err:
- EVP_PKEY_free(eph_key);
- return -1;
- }
-/*
- * EVP_PKEY_METHOD callback decrypt
- * Implementation of GOST2001 key transport, cryptopo variation
+/*
+ * EVP_PKEY_METHOD callback decrypt
+ * Implementation of GOST2001 key transport, cryptopo variation
*/
-int pkey_GOST01cp_decrypt (EVP_PKEY_CTX *pctx, unsigned char *key, size_t * key_len, const unsigned char *in, size_t in_len)
- {
- const unsigned char *p = in;
- EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
- GOST_KEY_TRANSPORT *gkt = NULL;
- int ret=0;
+int pkey_GOST01cp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
+ size_t *key_len, const unsigned char *in,
+ size_t in_len)
+{
+ const unsigned char *p = in;
+ EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
+ GOST_KEY_TRANSPORT *gkt = NULL;
+ int ret = 0;
+ unsigned char wrappedKey[44];
+ unsigned char sharedKey[32];
+ gost_ctx ctx;
+ const struct gost_cipher_info *param = NULL;
+ EVP_PKEY *eph_key = NULL, *peerkey = NULL;
+
+ 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_GOST01CP_DECRYPT,
+ GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
+ return -1;
+ }
+
+ /* If key transport structure contains public key, use it */
+ eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
+ if (eph_key) {
+ if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
+ GOST_R_INCOMPATIBLE_PEER_KEY);
+ goto err;
+ }
+ } else {
+ /* Set control "public key from client certificate used" */
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
+ <= 0) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT, GOST_R_CTRL_CALL_FAILED);
+ goto err;
+ }
+ }
+ peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
+ if (!peerkey) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT, GOST_R_NO_PEER_KEY);
+ goto err;
+ }
+
+ param = get_encryption_params(gkt->key_agreement_info->cipher);
+ if (!param) {
+ goto err;
+ }
+
+ gost_init(&ctx, 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);
+ VKO_compute_key(sharedKey, 32,
+ EC_KEY_get0_public_key(EVP_PKEY_get0(peerkey)),
+ EVP_PKEY_get0(priv), wrappedKey);
+ if (!keyUnwrapCryptoPro(&ctx, sharedKey, wrappedKey, key)) {
+ GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
+ GOST_R_ERROR_COMPUTING_SHARED_KEY);
+ goto err;
+ }
- if (!key)
- {
- *key_len = 32;
- return 1;
- }
- gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
- in_len);
- if (!gkt)
- {
- GOSTerr(GOST_F_PKCS7_GOST94CP_KEY_TRANSPORT_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
- return -1;
- }
- ret = decrypt_rfc4490_shared_key_2001(priv,gkt,key,*key_len);
- GOST_KEY_TRANSPORT_free(gkt);
- return ret;
- }
+ ret = 1;
+ err:
+ EVP_PKEY_free(eph_key);
+ if (gkt)
+ GOST_KEY_TRANSPORT_free(gkt);
+ return ret;
+}
projects / openssl.git / blobdiff