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openssl/engines/ccgost/gost94_keyx.c

+/**********************************************************************
+ *                             gost94_keyx.c                          *
+ *             Copyright (c) 2005-2006 Cryptocom LTD                  *
+ *         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                            *
+ *                                                                                                                                        *
+ *          Requires OpenSSL 0.9.9 for compilation                    *
+ **********************************************************************/
+#include <string.h>
+#include <openssl/dh.h>
+#include <openssl/rand.h>
+#include <openssl/evp.h>
+#include <openssl/objects.h>
+
+#include "gost89.h"
+#include "gosthash.h"
+#include "e_gost_err.h"
+#include "gost_keywrap.h"
+#include "gost_lcl.h"
+/* Common functions for both 94 and 2001 key exchange schemes */
+/* 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
+ * algorithm
+ */
+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 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();
+        
+        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;
+        }
+
+/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */
+
+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;
+
+                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_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;
+        EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx);
+
+        /* 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;
+                }       
+
+        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);
+        *outlen = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL);
+        if (*outlen <= 0)
+                {
+                GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
+                goto err;
+                }
+        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,
+                GOST_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;
+                }       
+                                
+        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;
+        }       
+