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openssl/engines/ccgost/gost2001_keyx.c

+/**********************************************************************
+ *                          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);
+    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;
+                }       
+                                
+        ret=1;
+err:    
+        if (eph_key) EVP_PKEY_free(eph_key);
+        if (gkt) GOST_KEY_TRANSPORT_free(gkt);
+        return ret;
+        }