1 /**********************************************************************
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
6 * OpenSSL interface to GOST 28147-89 cipher functions *
7 * Requires OpenSSL 0.9.9 for compilation *
8 **********************************************************************/
11 #include <openssl/rand.h>
12 #include "e_gost_err.h"
14 static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
15 const unsigned char *iv, int enc);
16 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
17 const unsigned char *iv, int enc);
18 /* Handles block of data in CFB mode */
19 static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
20 const unsigned char *in, size_t inl);
21 /* Handles block of data in CNT mode */
22 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
23 const unsigned char *in, size_t inl);
24 /* Cleanup function */
25 static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
26 /* set/get cipher parameters */
27 static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params);
28 static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params);
29 /* Control function */
30 static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr);
32 EVP_CIPHER cipher_gost =
38 EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING |
39 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
43 sizeof(struct ossl_gost_cipher_ctx),/* ctx_size */
44 gost89_set_asn1_parameters,
45 gost89_get_asn1_parameters,
50 EVP_CIPHER cipher_gost_cpacnt =
56 EVP_CIPH_OFB_MODE| EVP_CIPH_NO_PADDING |
57 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
61 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
62 gost89_set_asn1_parameters,
63 gost89_get_asn1_parameters,
68 /* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
69 /* Init functions which set specific parameters */
70 static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
71 /* process block of data */
72 static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
73 /* Return computed value */
74 static int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md);
76 static int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from);
77 static int gost_imit_cleanup(EVP_MD_CTX *ctx);
78 /* Control function, knows how to set MAC key.*/
79 static int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr);
81 EVP_MD imit_gost_cpa =
83 NID_id_Gost28147_89_MAC,
96 sizeof(struct ossl_gost_imit_ctx),
101 * Correspondence between gost parameter OIDs and substitution blocks
102 * NID field is filed by register_gost_NID function in engine.c
103 * upon engine initialization
106 struct gost_cipher_info gost_cipher_list[]=
108 /* NID */ /* Subst block */ /* Key meshing*/
109 /*{NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},*/
110 {NID_id_Gost28147_89_cc,&GostR3411_94_CryptoProParamSet,0},
111 {NID_id_Gost28147_89_CryptoPro_A_ParamSet,&Gost28147_CryptoProParamSetA,1},
112 {NID_id_Gost28147_89_CryptoPro_B_ParamSet,&Gost28147_CryptoProParamSetB,1},
113 {NID_id_Gost28147_89_CryptoPro_C_ParamSet,&Gost28147_CryptoProParamSetC,1},
114 {NID_id_Gost28147_89_CryptoPro_D_ParamSet,&Gost28147_CryptoProParamSetD,1},
115 {NID_id_Gost28147_89_TestParamSet,&Gost28147_TestParamSet,1},
119 /* get encryption parameters from crypto network settings
120 FIXME For now we use environment var CRYPT_PARAMS as place to
121 store these settings. Actually, it is better to use engine control command, read from configuration file to set them */
122 const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
125 struct gost_cipher_info *param;
128 const char * params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
129 if (!params || !strlen(params))
130 return &gost_cipher_list[1];
132 nid = OBJ_txt2nid(params);
133 if (nid == NID_undef)
135 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
136 GOST_R_INVALID_CIPHER_PARAM_OID);
142 nid= OBJ_obj2nid(obj);
144 for (param=gost_cipher_list;param->sblock!=NULL && param->nid!=nid;
148 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,GOST_R_INVALID_CIPHER_PARAMS);
154 /* Sets cipher param from paramset NID. */
155 static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c,int nid)
157 const struct gost_cipher_info *param;
158 param=get_encryption_params((nid==NID_undef?NULL:OBJ_nid2obj(nid)));
159 if (!param) return 0;
161 c->paramNID = param->nid;
162 c->key_meshing=param->key_meshing;
164 gost_init(&(c->cctx), param->sblock);
168 /* Initializes EVP_CIPHER_CTX by paramset NID */
169 static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, const unsigned char *key,
170 const unsigned char *iv, int enc, int paramNID,int mode)
172 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
173 if (ctx->app_data == NULL)
175 if (!gost_cipher_set_param(c,paramNID)) return 0;
176 ctx->app_data = ctx->cipher_data;
178 if (key) gost_key(&(c->cctx),key);
179 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
180 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
184 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
185 const unsigned char *iv, int enc)
187 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
188 gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
191 if(key) gost_key(&(c->cctx),key);
192 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
193 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
197 /* Initializes EVP_CIPHER_CTX with default values */
198 int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
199 const unsigned char *iv, int enc)
201 return gost_cipher_init_param(ctx,key,iv,enc,NID_undef,EVP_CIPH_CFB_MODE);
203 /* Wrapper around gostcrypt function from gost89.c which perform
204 * key meshing when nesseccary
206 static void gost_crypt_mesh (void *ctx,unsigned char *iv,unsigned char *buf)
208 struct ossl_gost_cipher_ctx *c = ctx;
209 if (c->count&&c->key_meshing && c->count%1024==0)
211 cryptopro_key_meshing(&(c->cctx),iv);
213 gostcrypt(&(c->cctx),iv,buf);
217 static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf)
219 struct ossl_gost_cipher_ctx *c = ctx;
221 unsigned char buf1[8];
222 if (c->count && c->key_meshing && c->count %1024 ==0)
224 cryptopro_key_meshing(&(c->cctx),iv);
228 gostcrypt(&(c->cctx),iv,buf1);
234 g = buf1[0]|(buf1[1]<<8)|(buf1[2]<<16)|(buf1[3]<<24);
236 buf1[0]=(unsigned char)(g&0xff);
237 buf1[1]=(unsigned char)((g>>8)&0xff);
238 buf1[2]=(unsigned char)((g>>16)&0xff);
239 buf1[3]=(unsigned char)((g>>24)&0xff);
240 g = buf1[4]|(buf1[5]<<8)|(buf1[6]<<16)|(buf1[7]<<24);
243 if (go > g) /* overflow*/
245 buf1[4]=(unsigned char)(g&0xff);
246 buf1[5]=(unsigned char)((g>>8)&0xff);
247 buf1[6]=(unsigned char)((g>>16)&0xff);
248 buf1[7]=(unsigned char)((g>>24)&0xff);
250 gostcrypt(&(c->cctx),buf1,buf);
254 /* GOST encryption in CFB mode */
255 int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
256 const unsigned char *in, size_t inl)
258 const unsigned char *in_ptr=in;
259 unsigned char *out_ptr=out;
262 /* process partial block if any */
265 for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
267 if (!ctx->encrypt) ctx->buf[j+8]=*in_ptr;
268 *out_ptr=ctx->buf[j]^(*in_ptr);
269 if (ctx->encrypt) ctx->buf[j+8]=*out_ptr;
273 memcpy(ctx->iv,ctx->buf+8,8);
283 for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
285 /*block cipher current iv */
286 gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
287 /*xor next block of input text with it and output it*/
288 /*output this block */
289 if (!ctx->encrypt) memcpy(ctx->iv,in_ptr,8);
292 out_ptr[j]=ctx->buf[j]^in_ptr[j];
295 /* Next iv is next block of cipher text*/
296 if (ctx->encrypt) memcpy(ctx->iv,out_ptr,8);
298 /* Process rest of buffer */
301 gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
302 if (!ctx->encrypt) memcpy(ctx->buf+8,in_ptr,inl-i);
303 for (j=0;i<inl;j++,i++)
305 out_ptr[j]=ctx->buf[j]^in_ptr[j];
308 if (ctx->encrypt) memcpy(ctx->buf+8,out_ptr,j);
317 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
318 const unsigned char *in, size_t inl)
320 const unsigned char *in_ptr=in;
321 unsigned char *out_ptr=out;
324 /* process partial block if any */
327 for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
329 *out_ptr=ctx->buf[j]^(*in_ptr);
342 for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
344 /*block cipher current iv */
346 gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
347 /*xor next block of input text with it and output it*/
348 /*output this block */
351 out_ptr[j]=ctx->buf[j]^in_ptr[j];
354 /* Process rest of buffer */
357 gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
358 for (j=0;i<inl;j++,i++)
360 out_ptr[j]=ctx->buf[j]^in_ptr[j];
371 /* Cleaning up of EVP_CIPHER_CTX */
372 int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
374 gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
375 ctx->app_data = NULL;
379 /* Control function for gost cipher */
380 int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr)
384 case EVP_CTRL_RAND_KEY:
386 if (RAND_bytes((unsigned char *)ptr,ctx->key_len)<=0)
388 GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_RANDOM_GENERATOR_ERROR);
393 case EVP_CTRL_PBE_PRF_NID:
395 *((int *)ptr)= NID_id_HMACGostR3411_94;
402 GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
408 /* Set cipher parameters from ASN1 structure */
409 int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params)
412 unsigned char *buf=NULL;
413 unsigned char *p=NULL;
414 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
415 GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
416 ASN1_OCTET_STRING *os = NULL;
419 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
422 if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len))
424 GOST_CIPHER_PARAMS_free(gcp);
425 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
428 ASN1_OBJECT_free(gcp->enc_param_set);
429 gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
431 len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
432 p = buf = (unsigned char*)OPENSSL_malloc(len);
435 GOST_CIPHER_PARAMS_free(gcp);
436 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
439 i2d_GOST_CIPHER_PARAMS(gcp, &p);
440 GOST_CIPHER_PARAMS_free(gcp);
442 os = ASN1_OCTET_STRING_new();
444 if(!os || !ASN1_OCTET_STRING_set(os, buf, len))
447 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
452 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
456 /* Store parameters into ASN1 structure */
457 int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params)
461 GOST_CIPHER_PARAMS *gcp = NULL;
463 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
464 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE)
469 p = params->value.sequence->data;
471 gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
472 params->value.sequence->length);
474 len = gcp->iv->length;
475 if (len != ctx->cipher->iv_len)
477 GOST_CIPHER_PARAMS_free(gcp);
478 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS,
479 GOST_R_INVALID_IV_LENGTH);
482 if (!gost_cipher_set_param(c,OBJ_obj2nid(gcp->enc_param_set)))
484 GOST_CIPHER_PARAMS_free(gcp);
487 memcpy(ctx->oiv, gcp->iv->data, len);
489 GOST_CIPHER_PARAMS_free(gcp);
495 int gost_imit_init_cpa(EVP_MD_CTX *ctx)
497 struct ossl_gost_imit_ctx *c = ctx->md_data;
498 memset(c->buffer,0,sizeof(c->buffer));
499 memset(c->partial_block,0,sizeof(c->partial_block));
503 gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
507 static void mac_block_mesh(struct ossl_gost_imit_ctx *c,const unsigned char *data)
509 unsigned char buffer[8];
510 /* We are using local buffer for iv because CryptoPro doesn't
511 * interpret internal state of MAC algorithm as iv during keymeshing
512 * (but does initialize internal state from iv in key transport
514 if (c->key_meshing&& c->count && c->count %1024 ==0)
516 cryptopro_key_meshing(&(c->cctx),buffer);
518 mac_block(&(c->cctx),c->buffer,data);
522 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
524 struct ossl_gost_imit_ctx *c = ctx->md_data;
525 const unsigned char *p = data;
526 size_t bytes = count,i;
528 GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
533 for (i=c->bytes_left;i<8&&bytes>0;bytes--,i++,p++)
535 c->partial_block[i]=*p;
539 mac_block_mesh(c,c->partial_block);
555 memcpy(c->partial_block,p,bytes);
561 int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md)
563 struct ossl_gost_imit_ctx *c = ctx->md_data;
565 GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
571 for (i=c->bytes_left;i<8;i++)
573 c->partial_block[i]=0;
575 mac_block_mesh(c,c->partial_block);
577 get_mac(c->buffer,32,md);
581 int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr)
585 case EVP_MD_CTRL_KEY_LEN:
586 *((unsigned int*)(ptr)) = 32;
588 case EVP_MD_CTRL_SET_KEY:
591 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
595 gost_key(&(((struct ossl_gost_imit_ctx*)(ctx->md_data))->cctx),ptr) ;
596 ((struct ossl_gost_imit_ctx*)(ctx->md_data))->key_set = 1;
605 int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from)
607 memcpy(to->md_data,from->md_data,sizeof(struct ossl_gost_imit_ctx));
611 /* Clean up imit ctx */
612 int gost_imit_cleanup(EVP_MD_CTX *ctx)
614 memset(ctx->md_data,0,sizeof(struct ossl_gost_imit_ctx));