diff options
Diffstat (limited to 'openssl/engines/ccgost/gost2001_keyx.c')
| -rw-r--r-- | openssl/engines/ccgost/gost2001_keyx.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/openssl/engines/ccgost/gost2001_keyx.c b/openssl/engines/ccgost/gost2001_keyx.c new file mode 100644 index 000000000..00759bcab --- /dev/null +++ b/openssl/engines/ccgost/gost2001_keyx.c @@ -0,0 +1,304 @@ +/********************************************************************** + * gost_keyx.c * + * Copyright (c) 2005-2006 Cryptocom LTD * + * This file is distributed under the same license as OpenSSL * + * * + * VK0 34.10-2001 key exchange and GOST R 34.10-2001 * + * based PKCS7/SMIME support * + * Requires OpenSSL 0.9.9 for compilation * + **********************************************************************/ +#include <openssl/evp.h> +#include <openssl/rand.h> +#include <string.h> +#include <openssl/objects.h> +#include "gost89.h" +#include "gosthash.h" +#include "e_gost_err.h" +#include "gost_keywrap.h" +#include "gost_lcl.h" +#include "gost2001_keyx.h" + + + +/* 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(); + + 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 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); + + if (!data->shared_ukm) { + GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET); + return 0; + } + + if (key == NULL) { + *keylen = 32; + return 32; + } + + *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; +} + + + + +/* + * 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 + */ + +/* + * EVP_PKEY_METHOD callback encrypt + * Implementation of GOST2001 key transport, cryptopo variation + */ + +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) + { + + 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 && sec_key) 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 && sec_key) EVP_PKEY_free(sec_key); + GOST_KEY_TRANSPORT_free(gkt); + return -1; + } +/* + * 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; + 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); + 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; + } + + ret=1; +err: + if (eph_key) EVP_PKEY_free(eph_key); + if (gkt) GOST_KEY_TRANSPORT_free(gkt); + return ret; + } |