diff options
Diffstat (limited to 'engines/ccgost/gost_crypt.c')
-rw-r--r-- | engines/ccgost/gost_crypt.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/engines/ccgost/gost_crypt.c b/engines/ccgost/gost_crypt.c new file mode 100644 index 0000000000..9b3803d8fd --- /dev/null +++ b/engines/ccgost/gost_crypt.c @@ -0,0 +1,579 @@ +/********************************************************************** +* gost_crypt.c * +* Copyright (c) 2005-2006 Cryptocom LTD * +* This file is distributed under the same license as OpenSSL * +* * +* OpenSSL interface to GOST 28147-89 cipher functions * +* Requires OpenSSL 0.9.9 for compilation * +**********************************************************************/ +#include <string.h> +#include "crypt.h" +#include "gost89.h" +#include <openssl/rand.h> +#include "e_gost_err.h" +#include "gost_asn1.h" +static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +#ifdef USE_SSL +/* Specialized init functions which set specific parameters */ +static int gost_cipher_init_vizir(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +#endif +/* Handles block of data in CFB mode */ +static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl); +/* Handles block of data in CNT mode */ +static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl); +/* Cleanup function */ +static int gost_cipher_cleanup(EVP_CIPHER_CTX *); +/* set/get cipher parameters */ +static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params); +static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params); +/* Control function */ +static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr); + +EVP_CIPHER cipher_gost = + { + NID_id_Gost28147_89, + 1,/*block_size*/ + 32,/*key_size*/ + 8,/*iv_len - синхропосылка*/ + EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING | + EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, + gost_cipher_init, + gost_cipher_do_cfb, + gost_cipher_cleanup, + sizeof(struct ossl_gost_cipher_ctx),/* ctx_size */ + gost89_set_asn1_parameters, + gost89_get_asn1_parameters, + gost_cipher_ctl, + NULL, + }; + +#ifdef USE_SSL +static EVP_CIPHER cipher_gost_vizircfb = + { + NID_undef, + 1,/*block_size*/ + 32,/*key_size*/ + 8,/*iv_len - синхропосылка*/ + EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING | + EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, + gost_cipher_init_vizir, + gost_cipher_do_cfb, + gost_cipher_cleanup, + sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */ + gost89_set_asn1_parameters, + gost89_get_asn1_parameters, + gost_cipher_ctl, + NULL, + }; + +static EVP_CIPHER cipher_gost_cpacnt = + { + NID_undef, + 1,/*block_size*/ + 32,/*key_size*/ + 8,/*iv_len - синхропосылка*/ + EVP_CIPH_OFB_MODE| EVP_CIPH_NO_PADDING | + EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, + gost_cipher_init_cpa, + gost_cipher_do_cnt, + gost_cipher_cleanup, + sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */ + gost89_set_asn1_parameters, + gost89_get_asn1_parameters, + gost_cipher_ctl, + NULL, + }; +/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */ +/* Init functions which set specific parameters */ +static int gost_imit_init_vizir(EVP_MD_CTX *ctx); +static int gost_imit_init_cpa(EVP_MD_CTX *ctx); +/* process block of data */ +static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count); +/* Return computed value */ +static int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md); +/* Copies context */ +static int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from); +static int gost_imit_cleanup(EVP_MD_CTX *ctx); +/* Control function, knows how to set MAC key.*/ +static int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr); + +EVP_MD imit_gost_vizir = + { + NID_undef, + NID_undef, + 4, + EVP_MD_FLAG_NEEDS_KEY, + gost_imit_init_vizir, + gost_imit_update, + gost_imit_final, + gost_imit_copy, + gost_imit_cleanup, + gost_imit_ctrl, + NULL, + NULL, + {0,0,0,0,0}, + 8, + sizeof(struct ossl_gost_imit_ctx) + }; + +EVP_MD imit_gost_cpa = + { + NID_undef, + NID_undef, + 4, + EVP_MD_FLAG_NEEDS_KEY, + gost_imit_init_cpa, + gost_imit_update, + gost_imit_final, + gost_imit_copy, + gost_imit_cleanup, + gost_imit_ctrl, + NULL, + NULL, + {0,0,0,0,0}, + 8, + sizeof(struct ossl_gost_imit_ctx) + }; + +#endif +/* +* Correspondence between gost parameter OIDs and substitution blocks +* NID field is filed by register_gost_NID function in engine.c +* upon engine initialization +*/ + +struct gost_cipher_info gost_cipher_list[]={ +/* NID */ /* Subst block */ /* Key meshing*/ +/*{NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},*/ +{NID_id_Gost28147_89_cc,&GostR3411_94_CryptoProParamSet,0}, +{NID_id_Gost28147_89_CryptoPro_A_ParamSet,&Gost28147_CryptoProParamSetA,1}, +{NID_id_Gost28147_89_CryptoPro_B_ParamSet,&Gost28147_CryptoProParamSetB,1}, +{NID_id_Gost28147_89_CryptoPro_C_ParamSet,&Gost28147_CryptoProParamSetC,1}, +{NID_id_Gost28147_89_CryptoPro_D_ParamSet,&Gost28147_CryptoProParamSetD,1}, +{NID_undef,NULL,0} +}; + +/* get encryption parameters from crypto network settings +FIXME For now we use environment var CRYPT_PARAMS as place to +store these settings. Actually, it is better to use engine control command, read from configuration file to set them */ +const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj) { +int nid; +struct gost_cipher_info *param; +if (!obj) { + const char * params = getenv("CRYPT_PARAMS"); + if (!params || !strlen(params)) + return &gost_cipher_list[0]; + + nid = OBJ_txt2nid(params); + if (nid == NID_undef) { + GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, + GOST_R_INVALID_CIPHER_PARAM_OID); + return NULL; + } +} else { + nid= OBJ_obj2nid(obj); +} +for (param=gost_cipher_list;param->sblock!=NULL && param->nid!=nid; + param++); +if (!param->sblock) { + GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,GOST_R_INVALID_CIPHER_PARAMS); + return NULL; + +} +return param; + +} +/* Sets cipher param from paramset NID. */ +int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c,int nid) { +const struct gost_cipher_info *param; +param=get_encryption_params((nid==NID_undef?NULL:OBJ_nid2obj(nid))); +if (!param) return 0; + +c->paramNID = param->nid; +c->key_meshing=param->key_meshing; +c->count=0; +gost_init(&(c->cctx), param->sblock); +return 1; +} +/* Initializes EVP_CIPHER_CTX by paramset NID */ +static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc, int paramNID,int mode) { +struct ossl_gost_cipher_ctx *c=ctx->cipher_data; +if (!gost_cipher_set_param(c,paramNID)) return 0; +if (key) gost_key(&(c->cctx),key); +if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); +memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); +return 1; +} + +/* Initializes EVP_CIPHER_CTX with fixed cryptopro A paramset */ +int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) { +struct ossl_gost_cipher_ctx *c=ctx->cipher_data; +gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA); +c->key_meshing=1; +c->count=0; +gost_key(&(c->cctx),key); +if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); +memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); +return 1; +} +/* Initializes EVP_CIPHER_CTX with fixed vizir paramset */ +int gost_cipher_init_vizir(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) { +struct ossl_gost_cipher_ctx *c=ctx->cipher_data; +gost_init(&(c->cctx),&GostR3411_94_CryptoProParamSet); +c->key_meshing=0; +c->count=0; +gost_key(&(c->cctx),key); + +if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); +memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); +return 1; +} + +/* Initializes EVP_CIPHER_CTX with default values */ +int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) { +return gost_cipher_init_param(ctx,key,iv,enc,NID_undef,EVP_CIPH_CFB_MODE); +} +/* Wrapper around gostcrypt function from gost89.c which perform +* key meshing when nesseccary +*/ +static void gost_crypt_mesh (void *ctx,unsigned char *iv,unsigned char *buf) { + struct ossl_gost_cipher_ctx *c = ctx; + if (c->count&&c->key_meshing && c->count%1024==0) { + cryptopro_key_meshing(&(c->cctx),iv); + } + gostcrypt(&(c->cctx),iv,buf); + c->count+=8; +} + +static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf) { +struct ossl_gost_cipher_ctx *c = ctx; +word32 g,go; +unsigned char buf1[8]; +if (c->count && c->key_meshing && c->count %1024 ==0) { + cryptopro_key_meshing(&(c->cctx),iv); +} +if (c->count==0) { +gostcrypt(&(c->cctx),iv,buf1); +} else { + memcpy(buf1,iv,8); +} + g = buf1[0]|(buf1[1]<<8)|(buf1[2]<<16)|(buf1[3]<<24); + g += 0x01010101; + buf1[0]=g&0xff; buf1[1]=(g>>8)&0xff; buf1[2]=(g>>16)&0xff; buf1[3]=(g>>24)&0xff; + g = buf1[4]|(buf1[5]<<8)|(buf1[6]<<16)|(buf1[7]<<24); + go = g; + g += 0x01010104; + if (go > g) /* overflow*/ + g++; + buf1[4]=g&0xff; buf1[5]=(g>>8)&0xff; buf1[6]=(g>>16)&0xff; buf1[7]=(g>>24)&0xff; + memcpy(iv,buf1,8); + gostcrypt(&(c->cctx),buf1,buf); +c->count +=8; +} + +/* GOST encryption in CFB mode */ +int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl) { +const unsigned char *in_ptr=in; +unsigned char *out_ptr=out; +int i=0; +int j; +/* process partial block if any */ +if (ctx->num) +{ + for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++) + { + if (!ctx->encrypt) ctx->buf[j+8]=*in_ptr; + *out_ptr=ctx->buf[j]^(*in_ptr); + if (ctx->encrypt) ctx->buf[j+8]=*out_ptr; + } + if (j==8) { + memcpy(ctx->iv,ctx->buf+8,8); + ctx->num=0; + } else { + ctx->num=j; + return 1; + } +} + +for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8) { + /*block cipher current iv */ + gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf); + /*xor next block of input text with it and output it*/ + /*output this block */ + if (!ctx->encrypt) memcpy(ctx->iv,in_ptr,8); + for (j=0;j<8;j++) { + out_ptr[j]=ctx->buf[j]^in_ptr[j]; + } + /* Encrypt */ + /* Next iv is next block of cipher text*/ + if (ctx->encrypt) memcpy(ctx->iv,out_ptr,8); +} +/* Process rest of buffer */ +if (i<inl) { + gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf); + if (!ctx->encrypt) memcpy(ctx->buf+8,in_ptr,j); + for (j=0;i<inl;j++,i++) { + out_ptr[j]=ctx->buf[j]^in_ptr[j]; + } + ctx->num = j; + if (ctx->encrypt) memcpy(ctx->buf+8,out_ptr,j); +} else { + ctx->num = 0; +} +return 1; +} +int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl) { +const unsigned char *in_ptr=in; +unsigned char *out_ptr=out; +int i=0; +int j; +/* process partial block if any */ +if (ctx->num) +{ + for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++) + { + *out_ptr=ctx->buf[j]^(*in_ptr); + } + if (j==8) { + ctx->num=0; + } else { + ctx->num=j; + return 1; + } +} + +for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8) { + /*block cipher current iv */ + /* Encrypt */ + gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf); + /*xor next block of input text with it and output it*/ + /*output this block */ + for (j=0;j<8;j++) { + out_ptr[j]=ctx->buf[j]^in_ptr[j]; + } +} +/* Process rest of buffer */ +if (i<inl) { + gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf); + for (j=0;i<inl;j++,i++) { + out_ptr[j]=ctx->buf[j]^in_ptr[j]; + } + ctx->num = j; +} else { + ctx->num = 0; +} +return 1; +} +/* Cleaning up of EVP_CIPHER_CTX */ +int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx) +{ +gost_destroy((gost_ctx *)ctx->cipher_data); +return 1; + +} +/* Control function for gost cipher */ +int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr) +{ +switch (type) +{ + case EVP_CTRL_RAND_KEY: + { + if (RAND_bytes((unsigned char *)ptr,ctx->key_len)<=0) + { + GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_RANDOM_GENERATOR_ERROR); + return -1; + } + break; + } + default: + GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND); + return -1; +} +return 1; +} + +/* Set cipher parameters from ASN1 structure */ +int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params) +{ +int len=0; +unsigned char *buf=NULL; +unsigned char *p=NULL; +struct ossl_gost_cipher_ctx *c = ctx->cipher_data; +GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new(); +ASN1_OCTET_STRING *os = NULL; +if (!gcp) { + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; +} +if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) { + GOST_CIPHER_PARAMS_free(gcp); + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; +} +ASN1_OBJECT_free(gcp->enc_param_set); +gcp->enc_param_set = OBJ_nid2obj(c->paramNID); + +len = i2d_GOST_CIPHER_PARAMS(gcp, NULL); +p = buf = (unsigned char*)OPENSSL_malloc(len); +if (!buf) { + GOST_CIPHER_PARAMS_free(gcp); + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; +} +i2d_GOST_CIPHER_PARAMS(gcp, &p); +GOST_CIPHER_PARAMS_free(gcp); + +os = ASN1_OCTET_STRING_new(); + +if(!os || !ASN1_OCTET_STRING_set(os, buf, len)) { + OPENSSL_free(buf); + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; +} +OPENSSL_free(buf); + +ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os); +return 1; +} +/* Store parameters into ASN1 structure */ +int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params) +{ +int ret = -1; +int len; +GOST_CIPHER_PARAMS *gcp = NULL; +unsigned char *p = params->value.sequence->data; +struct ossl_gost_cipher_ctx *c=ctx->cipher_data; +if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) { + return ret; +} + +gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p, + params->value.sequence->length); + +len = gcp->iv->length; +if (len != ctx->cipher->iv_len) { + GOST_CIPHER_PARAMS_free(gcp); + GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, + GOST_R_INVALID_IV_LENGTH); + return -1; +} +if (!gost_cipher_set_param(c,OBJ_obj2nid(gcp->enc_param_set))) { + GOST_CIPHER_PARAMS_free(gcp); + return -1; +} +memcpy(ctx->oiv, gcp->iv->data, len); + +GOST_CIPHER_PARAMS_free(gcp); + +return 1; + +} + +#ifdef USE_SSL + +int gost_imit_init_vizir(EVP_MD_CTX *ctx) { +struct ossl_gost_imit_ctx *c = ctx->md_data; +memset(c,0,sizeof(struct ossl_gost_imit_ctx)); +gost_init(&(c->cctx),&GostR3411_94_CryptoProParamSet); +return 1; +} +int gost_imit_init_cpa(EVP_MD_CTX *ctx) { +struct ossl_gost_imit_ctx *c = ctx->md_data; +memset(c,0,sizeof(struct ossl_gost_imit_ctx)); +c->key_meshing=1; +gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA); +return 1; +} + +static void mac_block_mesh(struct ossl_gost_imit_ctx *c,unsigned char *data) +{ + char buffer[8]; + /* We are using local buffer for iv because CryptoPro doesn't + * interpret internal state of MAC algorithm as iv during keymeshing + * (but does initialize internal state from iv in key transport + */ + if (c->key_meshing&& c->count && c->count %1024 ==0) { + cryptopro_key_meshing(&(c->cctx),buffer); + } + mac_block(&(c->cctx),c->buffer,data); + c->count +=8; +} + +int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count) { + struct ossl_gost_imit_ctx *c = ctx->md_data; + const unsigned char *p = data; + size_t bytes = count,i; + if (!(c->key_set)) return 0; + if (c->bytes_left) { + for (i=c->bytes_left;i<8&&bytes>0;bytes--,i++,p++) { + c->partial_block[i]=*p; + } + if (i==8) { + mac_block_mesh(c,c->partial_block); + } else { + c->bytes_left = i; + return 1; + } + } + while (bytes>8) { + mac_block_mesh(c,p); + p+=8; + bytes-=8; + } + if (bytes>0) { + memcpy(c->partial_block,p,bytes); + c->bytes_left=bytes; + } + return 1; +} + +int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md) { + struct ossl_gost_imit_ctx *c = ctx->md_data; + if (c->bytes_left) { + int i; + for (i=c->bytes_left;i<8;i++) { + c->partial_block[i]=0; + } + mac_block_mesh(c,c->partial_block); + } + get_mac(c->buffer,32,md); + return 1; +} +int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr) { + switch (type) { + case EVP_MD_CTRL_GET_TLS_MAC_KEY_LENGTH: + *((unsigned int*)(ptr)) = 32; + return 1; + case EVP_MD_CTRL_SET_KEY: + { + gost_key(&(((struct ossl_gost_imit_ctx*)(ctx->md_data))->cctx),ptr) ; + ((struct ossl_gost_imit_ctx*)(ctx->md_data))->key_set = 1; + + } + default: + return 0; + } +} +int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from) { + memcpy(to->md_data,from->md_data,sizeof(struct ossl_gost_imit_ctx)); + return 1; +} +/* Clean up imit ctx */ +int gost_imit_cleanup(EVP_MD_CTX *ctx) { + memset(ctx->md_data,0,sizeof(struct ossl_gost_imit_ctx)); + return 1; + +} +#endif |