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);
19 /* Specialized init functions which set specific parameters */
20 static int gost_cipher_init_vizir(EVP_CIPHER_CTX *ctx, const unsigned char *key,
21 const unsigned char *iv, int enc);
23 /* Handles block of data in CFB mode */
24 static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
25 const unsigned char *in, unsigned int inl);
26 /* Handles block of data in CNT mode */
27 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
28 const unsigned char *in, unsigned int inl);
29 /* Cleanup function */
30 static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
31 /* set/get cipher parameters */
32 static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params);
33 static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params);
34 /* Control function */
35 static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr);
37 EVP_CIPHER cipher_gost =
42 8,/*iv_len - ñèíõðîïîñûëêà*/
43 EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING |
44 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
48 sizeof(struct ossl_gost_cipher_ctx),/* ctx_size */
49 gost89_set_asn1_parameters,
50 gost89_get_asn1_parameters,
55 EVP_CIPHER cipher_gost_cpacnt =
60 8,/*iv_len - ñèíõðîïîñûëêà*/
61 EVP_CIPH_OFB_MODE| EVP_CIPH_NO_PADDING |
62 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
66 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
67 gost89_set_asn1_parameters,
68 gost89_get_asn1_parameters,
74 static EVP_CIPHER cipher_gost_vizircfb =
79 8,/*iv_len - ñèíõðîïîñûëêà*/
80 EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING |
81 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
82 gost_cipher_init_vizir,
85 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
86 gost89_set_asn1_parameters,
87 gost89_get_asn1_parameters,
92 /* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
93 /* Init functions which set specific parameters */
95 static int gost_imit_init_vizir(EVP_MD_CTX *ctx);
97 static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
98 /* process block of data */
99 static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
100 /* Return computed value */
101 static int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md);
103 static int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from);
104 static int gost_imit_cleanup(EVP_MD_CTX *ctx);
105 /* Control function, knows how to set MAC key.*/
106 static int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr);
110 EVP_MD imit_gost_vizir =
115 EVP_MD_FLAG_NEEDS_KEY,
116 gost_imit_init_vizir,
126 sizeof(struct ossl_gost_imit_ctx)
129 EVP_MD imit_gost_cpa =
131 NID_id_Gost28147_89_MAC,
144 sizeof(struct ossl_gost_imit_ctx),
149 * Correspondence between gost parameter OIDs and substitution blocks
150 * NID field is filed by register_gost_NID function in engine.c
151 * upon engine initialization
154 struct gost_cipher_info gost_cipher_list[]=
156 /* NID */ /* Subst block */ /* Key meshing*/
157 /*{NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},*/
158 {NID_id_Gost28147_89_cc,&GostR3411_94_CryptoProParamSet,0},
159 {NID_id_Gost28147_89_CryptoPro_A_ParamSet,&Gost28147_CryptoProParamSetA,1},
160 {NID_id_Gost28147_89_CryptoPro_B_ParamSet,&Gost28147_CryptoProParamSetB,1},
161 {NID_id_Gost28147_89_CryptoPro_C_ParamSet,&Gost28147_CryptoProParamSetC,1},
162 {NID_id_Gost28147_89_CryptoPro_D_ParamSet,&Gost28147_CryptoProParamSetD,1},
163 {NID_id_Gost28147_89_TestParamSet,&Gost28147_TestParamSet,1},
167 /* get encryption parameters from crypto network settings
168 FIXME For now we use environment var CRYPT_PARAMS as place to
169 store these settings. Actually, it is better to use engine control command, read from configuration file to set them */
170 const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
173 struct gost_cipher_info *param;
176 const char * params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
177 if (!params || !strlen(params))
178 return &gost_cipher_list[0];
180 nid = OBJ_txt2nid(params);
181 if (nid == NID_undef)
183 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
184 GOST_R_INVALID_CIPHER_PARAM_OID);
190 nid= OBJ_obj2nid(obj);
192 for (param=gost_cipher_list;param->sblock!=NULL && param->nid!=nid;
196 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,GOST_R_INVALID_CIPHER_PARAMS);
202 /* Sets cipher param from paramset NID. */
203 static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c,int nid)
205 const struct gost_cipher_info *param;
206 param=get_encryption_params((nid==NID_undef?NULL:OBJ_nid2obj(nid)));
207 if (!param) return 0;
209 c->paramNID = param->nid;
210 c->key_meshing=param->key_meshing;
212 gost_init(&(c->cctx), param->sblock);
216 /* Initializes EVP_CIPHER_CTX by paramset NID */
217 static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, const unsigned char *key,
218 const unsigned char *iv, int enc, int paramNID,int mode)
220 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
221 if (ctx->app_data == NULL)
223 if (!gost_cipher_set_param(c,paramNID)) return 0;
224 ctx->app_data = ctx->cipher_data;
226 if (key) gost_key(&(c->cctx),key);
227 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
228 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
232 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
233 const unsigned char *iv, int enc)
235 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
236 gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
239 if(key) gost_key(&(c->cctx),key);
240 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
241 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
245 /* Initializes EVP_CIPHER_CTX with fixed cryptopro A paramset */
247 /* Initializes EVP_CIPHER_CTX with fixed vizir paramset */
248 static int gost_cipher_init_vizir(EVP_CIPHER_CTX *ctx, const unsigned char *key,
249 const unsigned char *iv, int enc)
251 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
252 gost_init(&(c->cctx),&GostR3411_94_CryptoProParamSet);
255 gost_key(&(c->cctx),key);
257 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
258 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
261 #endif /* def USE_SSL */
263 /* Initializes EVP_CIPHER_CTX with default values */
264 int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
265 const unsigned char *iv, int enc)
267 return gost_cipher_init_param(ctx,key,iv,enc,NID_undef,EVP_CIPH_CFB_MODE);
269 /* Wrapper around gostcrypt function from gost89.c which perform
270 * key meshing when nesseccary
272 static void gost_crypt_mesh (void *ctx,unsigned char *iv,unsigned char *buf)
274 struct ossl_gost_cipher_ctx *c = ctx;
275 if (c->count&&c->key_meshing && c->count%1024==0)
277 cryptopro_key_meshing(&(c->cctx),iv);
279 gostcrypt(&(c->cctx),iv,buf);
283 static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf)
285 struct ossl_gost_cipher_ctx *c = ctx;
287 unsigned char buf1[8];
288 if (c->count && c->key_meshing && c->count %1024 ==0)
290 cryptopro_key_meshing(&(c->cctx),iv);
294 gostcrypt(&(c->cctx),iv,buf1);
300 g = buf1[0]|(buf1[1]<<8)|(buf1[2]<<16)|(buf1[3]<<24);
302 buf1[0]=g&0xff; buf1[1]=(g>>8)&0xff; buf1[2]=(g>>16)&0xff; buf1[3]=(g>>24)&0xff;
303 g = buf1[4]|(buf1[5]<<8)|(buf1[6]<<16)|(buf1[7]<<24);
306 if (go > g) /* overflow*/
308 buf1[4]=g&0xff; buf1[5]=(g>>8)&0xff; buf1[6]=(g>>16)&0xff; buf1[7]=(g>>24)&0xff;
310 gostcrypt(&(c->cctx),buf1,buf);
314 /* GOST encryption in CFB mode */
315 int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
316 const unsigned char *in, unsigned int inl)
318 const unsigned char *in_ptr=in;
319 unsigned char *out_ptr=out;
322 /* process partial block if any */
325 for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
327 if (!ctx->encrypt) ctx->buf[j+8]=*in_ptr;
328 *out_ptr=ctx->buf[j]^(*in_ptr);
329 if (ctx->encrypt) ctx->buf[j+8]=*out_ptr;
333 memcpy(ctx->iv,ctx->buf+8,8);
343 for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
345 /*block cipher current iv */
346 gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
347 /*xor next block of input text with it and output it*/
348 /*output this block */
349 if (!ctx->encrypt) memcpy(ctx->iv,in_ptr,8);
352 out_ptr[j]=ctx->buf[j]^in_ptr[j];
355 /* Next iv is next block of cipher text*/
356 if (ctx->encrypt) memcpy(ctx->iv,out_ptr,8);
358 /* Process rest of buffer */
361 gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
362 if (!ctx->encrypt) memcpy(ctx->buf+8,in_ptr,j);
363 for (j=0;i<inl;j++,i++)
365 out_ptr[j]=ctx->buf[j]^in_ptr[j];
368 if (ctx->encrypt) memcpy(ctx->buf+8,out_ptr,j);
377 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
378 const unsigned char *in, unsigned int inl)
380 const unsigned char *in_ptr=in;
381 unsigned char *out_ptr=out;
384 /* process partial block if any */
387 for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
389 *out_ptr=ctx->buf[j]^(*in_ptr);
402 for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
404 /*block cipher current iv */
406 gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
407 /*xor next block of input text with it and output it*/
408 /*output this block */
411 out_ptr[j]=ctx->buf[j]^in_ptr[j];
414 /* Process rest of buffer */
417 gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
418 for (j=0;i<inl;j++,i++)
420 out_ptr[j]=ctx->buf[j]^in_ptr[j];
431 /* Cleaning up of EVP_CIPHER_CTX */
432 int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
434 gost_destroy((gost_ctx *)ctx->cipher_data);
435 ctx->app_data = NULL;
439 /* Control function for gost cipher */
440 int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr)
444 case EVP_CTRL_RAND_KEY:
446 if (RAND_bytes((unsigned char *)ptr,ctx->key_len)<=0)
448 GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_RANDOM_GENERATOR_ERROR);
454 GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
460 /* Set cipher parameters from ASN1 structure */
461 int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params)
464 unsigned char *buf=NULL;
465 unsigned char *p=NULL;
466 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
467 GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
468 ASN1_OCTET_STRING *os = NULL;
471 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
474 if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len))
476 GOST_CIPHER_PARAMS_free(gcp);
477 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
480 ASN1_OBJECT_free(gcp->enc_param_set);
481 gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
483 len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
484 p = buf = (unsigned char*)OPENSSL_malloc(len);
487 GOST_CIPHER_PARAMS_free(gcp);
488 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
491 i2d_GOST_CIPHER_PARAMS(gcp, &p);
492 GOST_CIPHER_PARAMS_free(gcp);
494 os = ASN1_OCTET_STRING_new();
496 if(!os || !ASN1_OCTET_STRING_set(os, buf, len))
499 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
504 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
508 /* Store parameters into ASN1 structure */
509 int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params)
513 GOST_CIPHER_PARAMS *gcp = NULL;
514 unsigned char *p = params->value.sequence->data;
515 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
516 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE)
521 gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
522 params->value.sequence->length);
524 len = gcp->iv->length;
525 if (len != ctx->cipher->iv_len)
527 GOST_CIPHER_PARAMS_free(gcp);
528 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS,
529 GOST_R_INVALID_IV_LENGTH);
532 if (!gost_cipher_set_param(c,OBJ_obj2nid(gcp->enc_param_set)))
534 GOST_CIPHER_PARAMS_free(gcp);
537 memcpy(ctx->oiv, gcp->iv->data, len);
539 GOST_CIPHER_PARAMS_free(gcp);
546 int gost_imit_init_vizir(EVP_MD_CTX *ctx)
548 struct ossl_gost_imit_ctx *c = ctx->md_data;
549 memset(c,0,sizeof(struct ossl_gost_imit_ctx));
550 gost_init(&(c->cctx),&GostR3411_94_CryptoProParamSet);
555 int gost_imit_init_cpa(EVP_MD_CTX *ctx)
557 struct ossl_gost_imit_ctx *c = ctx->md_data;
558 memset(c->buffer,0,16);
562 gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
566 static void mac_block_mesh(struct ossl_gost_imit_ctx *c,const unsigned char *data)
568 unsigned char buffer[8];
569 /* We are using local buffer for iv because CryptoPro doesn't
570 * interpret internal state of MAC algorithm as iv during keymeshing
571 * (but does initialize internal state from iv in key transport
573 if (c->key_meshing&& c->count && c->count %1024 ==0)
575 cryptopro_key_meshing(&(c->cctx),buffer);
577 mac_block(&(c->cctx),c->buffer,data);
581 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
583 struct ossl_gost_imit_ctx *c = ctx->md_data;
584 const unsigned char *p = data;
585 size_t bytes = count,i;
587 GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
592 for (i=c->bytes_left;i<8&&bytes>0;bytes--,i++,p++)
594 c->partial_block[i]=*p;
598 mac_block_mesh(c,c->partial_block);
614 memcpy(c->partial_block,p,bytes);
620 int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md)
622 struct ossl_gost_imit_ctx *c = ctx->md_data;
626 for (i=c->bytes_left;i<8;i++)
628 c->partial_block[i]=0;
630 mac_block_mesh(c,c->partial_block);
632 get_mac(c->buffer,32,md);
633 if (!c->key_set) return 0;
637 int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr)
641 case EVP_MD_CTRL_KEY_LEN:
642 *((unsigned int*)(ptr)) = 32;
644 case EVP_MD_CTRL_SET_KEY:
647 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
651 gost_key(&(((struct ossl_gost_imit_ctx*)(ctx->md_data))->cctx),ptr) ;
652 ((struct ossl_gost_imit_ctx*)(ctx->md_data))->key_set = 1;
661 int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from)
663 memcpy(to->md_data,from->md_data,sizeof(struct ossl_gost_imit_ctx));
667 /* Clean up imit ctx */
668 int gost_imit_cleanup(EVP_MD_CTX *ctx)
670 memset(ctx->md_data,0,sizeof(struct ossl_gost_imit_ctx));