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);
17 /* Specialized init functions which set specific parameters */
18 static int gost_cipher_init_vizir(EVP_CIPHER_CTX *ctx, const unsigned char *key,
19 const unsigned char *iv, int enc);
20 static int gost_cipher_init_cpa(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);
27 /* Handles block of data in CNT mode */
28 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
29 const unsigned char *in, unsigned int inl);
31 /* Cleanup function */
32 static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
33 /* set/get cipher parameters */
34 static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params);
35 static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params);
36 /* Control function */
37 static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr);
39 EVP_CIPHER cipher_gost =
44 8,/*iv_len - ñèíõðîïîñûëêà*/
45 EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING |
46 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
50 sizeof(struct ossl_gost_cipher_ctx),/* ctx_size */
51 gost89_set_asn1_parameters,
52 gost89_get_asn1_parameters,
58 static EVP_CIPHER cipher_gost_vizircfb =
63 8,/*iv_len - ñèíõðîïîñûëêà*/
64 EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING |
65 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
66 gost_cipher_init_vizir,
69 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
70 gost89_set_asn1_parameters,
71 gost89_get_asn1_parameters,
76 static EVP_CIPHER cipher_gost_cpacnt =
81 8,/*iv_len - ñèíõðîïîñûëêà*/
82 EVP_CIPH_OFB_MODE| EVP_CIPH_NO_PADDING |
83 EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
87 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
88 gost89_set_asn1_parameters,
89 gost89_get_asn1_parameters,
93 /* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
94 /* Init functions which set specific parameters */
95 static int gost_imit_init_vizir(EVP_MD_CTX *ctx);
96 static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
97 /* process block of data */
98 static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
99 /* Return computed value */
100 static int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md);
102 static int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from);
103 static int gost_imit_cleanup(EVP_MD_CTX *ctx);
104 /* Control function, knows how to set MAC key.*/
105 static int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr);
107 EVP_MD imit_gost_vizir =
112 EVP_MD_FLAG_NEEDS_KEY,
113 gost_imit_init_vizir,
123 sizeof(struct ossl_gost_imit_ctx)
126 EVP_MD imit_gost_cpa =
131 EVP_MD_FLAG_NEEDS_KEY,
142 sizeof(struct ossl_gost_imit_ctx)
147 * Correspondence between gost parameter OIDs and substitution blocks
148 * NID field is filed by register_gost_NID function in engine.c
149 * upon engine initialization
152 struct gost_cipher_info gost_cipher_list[]=
154 /* NID */ /* Subst block */ /* Key meshing*/
155 /*{NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},*/
156 {NID_id_Gost28147_89_cc,&GostR3411_94_CryptoProParamSet,0},
157 {NID_id_Gost28147_89_CryptoPro_A_ParamSet,&Gost28147_CryptoProParamSetA,1},
158 {NID_id_Gost28147_89_CryptoPro_B_ParamSet,&Gost28147_CryptoProParamSetB,1},
159 {NID_id_Gost28147_89_CryptoPro_C_ParamSet,&Gost28147_CryptoProParamSetC,1},
160 {NID_id_Gost28147_89_CryptoPro_D_ParamSet,&Gost28147_CryptoProParamSetD,1},
161 {NID_id_Gost28147_89_TestParamSet,&Gost28147_TestParamSet,1},
165 /* get encryption parameters from crypto network settings
166 FIXME For now we use environment var CRYPT_PARAMS as place to
167 store these settings. Actually, it is better to use engine control command, read from configuration file to set them */
168 const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
171 struct gost_cipher_info *param;
174 const char * params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
175 if (!params || !strlen(params))
176 return &gost_cipher_list[0];
178 nid = OBJ_txt2nid(params);
179 if (nid == NID_undef)
181 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
182 GOST_R_INVALID_CIPHER_PARAM_OID);
188 nid= OBJ_obj2nid(obj);
190 for (param=gost_cipher_list;param->sblock!=NULL && param->nid!=nid;
194 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,GOST_R_INVALID_CIPHER_PARAMS);
200 /* Sets cipher param from paramset NID. */
201 static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c,int nid)
203 const struct gost_cipher_info *param;
204 param=get_encryption_params((nid==NID_undef?NULL:OBJ_nid2obj(nid)));
205 if (!param) return 0;
207 c->paramNID = param->nid;
208 c->key_meshing=param->key_meshing;
210 gost_init(&(c->cctx), param->sblock);
214 /* Initializes EVP_CIPHER_CTX by paramset NID */
215 static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, const unsigned char *key,
216 const unsigned char *iv, int enc, int paramNID,int mode)
218 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
219 if (ctx->app_data == NULL)
221 if (!gost_cipher_set_param(c,paramNID)) return 0;
222 ctx->app_data = ctx->cipher_data;
224 if (key) gost_key(&(c->cctx),key);
225 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
226 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
231 /* Initializes EVP_CIPHER_CTX with fixed cryptopro A paramset */
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 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 vizir paramset */
246 static int gost_cipher_init_vizir(EVP_CIPHER_CTX *ctx, const unsigned char *key,
247 const unsigned char *iv, int enc)
249 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
250 gost_init(&(c->cctx),&GostR3411_94_CryptoProParamSet);
253 gost_key(&(c->cctx),key);
255 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
256 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
259 #endif /* def USE_SSL */
261 /* Initializes EVP_CIPHER_CTX with default values */
262 int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
263 const unsigned char *iv, int enc)
265 return gost_cipher_init_param(ctx,key,iv,enc,NID_undef,EVP_CIPH_CFB_MODE);
267 /* Wrapper around gostcrypt function from gost89.c which perform
268 * key meshing when nesseccary
270 static void gost_crypt_mesh (void *ctx,unsigned char *iv,unsigned char *buf)
272 struct ossl_gost_cipher_ctx *c = ctx;
273 if (c->count&&c->key_meshing && c->count%1024==0)
275 cryptopro_key_meshing(&(c->cctx),iv);
277 gostcrypt(&(c->cctx),iv,buf);
282 static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf)
284 struct ossl_gost_cipher_ctx *c = ctx;
286 unsigned char buf1[8];
287 if (c->count && c->key_meshing && c->count %1024 ==0)
289 cryptopro_key_meshing(&(c->cctx),iv);
293 gostcrypt(&(c->cctx),iv,buf1);
299 g = buf1[0]|(buf1[1]<<8)|(buf1[2]<<16)|(buf1[3]<<24);
301 buf1[0]=g&0xff; buf1[1]=(g>>8)&0xff; buf1[2]=(g>>16)&0xff; buf1[3]=(g>>24)&0xff;
302 g = buf1[4]|(buf1[5]<<8)|(buf1[6]<<16)|(buf1[7]<<24);
305 if (go > g) /* overflow*/
307 buf1[4]=g&0xff; buf1[5]=(g>>8)&0xff; buf1[6]=(g>>16)&0xff; buf1[7]=(g>>24)&0xff;
309 gostcrypt(&(c->cctx),buf1,buf);
312 #endif /* def USE_SSL */
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);
378 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
379 const unsigned char *in, unsigned int inl)
381 const unsigned char *in_ptr=in;
382 unsigned char *out_ptr=out;
385 /* process partial block if any */
388 for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
390 *out_ptr=ctx->buf[j]^(*in_ptr);
403 for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
405 /*block cipher current iv */
407 gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
408 /*xor next block of input text with it and output it*/
409 /*output this block */
412 out_ptr[j]=ctx->buf[j]^in_ptr[j];
415 /* Process rest of buffer */
418 gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
419 for (j=0;i<inl;j++,i++)
421 out_ptr[j]=ctx->buf[j]^in_ptr[j];
431 #endif /* def USE_SSL */
433 /* Cleaning up of EVP_CIPHER_CTX */
434 int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
436 gost_destroy((gost_ctx *)ctx->cipher_data);
437 ctx->app_data = NULL;
441 /* Control function for gost cipher */
442 int gost_cipher_ctl(EVP_CIPHER_CTX *ctx,int type,int arg,void *ptr)
446 case EVP_CTRL_RAND_KEY:
448 if (RAND_bytes((unsigned char *)ptr,ctx->key_len)<=0)
450 GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_RANDOM_GENERATOR_ERROR);
456 GOSTerr(GOST_F_GOST_CIPHER_CTL,GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
462 /* Set cipher parameters from ASN1 structure */
463 int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params)
466 unsigned char *buf=NULL;
467 unsigned char *p=NULL;
468 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
469 GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
470 ASN1_OCTET_STRING *os = NULL;
473 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
476 if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len))
478 GOST_CIPHER_PARAMS_free(gcp);
479 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
482 ASN1_OBJECT_free(gcp->enc_param_set);
483 gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
485 len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
486 p = buf = (unsigned char*)OPENSSL_malloc(len);
489 GOST_CIPHER_PARAMS_free(gcp);
490 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
493 i2d_GOST_CIPHER_PARAMS(gcp, &p);
494 GOST_CIPHER_PARAMS_free(gcp);
496 os = ASN1_OCTET_STRING_new();
498 if(!os || !ASN1_OCTET_STRING_set(os, buf, len))
501 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
506 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
510 /* Store parameters into ASN1 structure */
511 int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx,ASN1_TYPE *params)
515 GOST_CIPHER_PARAMS *gcp = NULL;
516 unsigned char *p = params->value.sequence->data;
517 struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
518 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE)
523 gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
524 params->value.sequence->length);
526 len = gcp->iv->length;
527 if (len != ctx->cipher->iv_len)
529 GOST_CIPHER_PARAMS_free(gcp);
530 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS,
531 GOST_R_INVALID_IV_LENGTH);
534 if (!gost_cipher_set_param(c,OBJ_obj2nid(gcp->enc_param_set)))
536 GOST_CIPHER_PARAMS_free(gcp);
539 memcpy(ctx->oiv, gcp->iv->data, len);
541 GOST_CIPHER_PARAMS_free(gcp);
548 int gost_imit_init_vizir(EVP_MD_CTX *ctx)
550 struct ossl_gost_imit_ctx *c = ctx->md_data;
551 memset(c,0,sizeof(struct ossl_gost_imit_ctx));
552 gost_init(&(c->cctx),&GostR3411_94_CryptoProParamSet);
556 int gost_imit_init_cpa(EVP_MD_CTX *ctx)
558 struct ossl_gost_imit_ctx *c = ctx->md_data;
559 memset(c,0,sizeof(struct ossl_gost_imit_ctx));
561 gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
565 static void mac_block_mesh(struct ossl_gost_imit_ctx *c,unsigned char *data)
568 /* We are using local buffer for iv because CryptoPro doesn't
569 * interpret internal state of MAC algorithm as iv during keymeshing
570 * (but does initialize internal state from iv in key transport
572 if (c->key_meshing&& c->count && c->count %1024 ==0)
574 cryptopro_key_meshing(&(c->cctx),buffer);
576 mac_block(&(c->cctx),c->buffer,data);
580 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
582 struct ossl_gost_imit_ctx *c = ctx->md_data;
583 const unsigned char *p = data;
584 size_t bytes = count,i;
585 if (!(c->key_set)) return 0;
588 for (i=c->bytes_left;i<8&&bytes>0;bytes--,i++,p++)
590 c->partial_block[i]=*p;
594 mac_block_mesh(c,c->partial_block);
610 memcpy(c->partial_block,p,bytes);
616 int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md)
618 struct ossl_gost_imit_ctx *c = ctx->md_data;
622 for (i=c->bytes_left;i<8;i++)
624 c->partial_block[i]=0;
626 mac_block_mesh(c,c->partial_block);
628 get_mac(c->buffer,32,md);
632 int gost_imit_ctrl(EVP_MD_CTX *ctx,int type, int arg, void *ptr)
636 case EVP_MD_CTRL_GET_TLS_MAC_KEY_LENGTH:
637 *((unsigned int*)(ptr)) = 32;
639 case EVP_MD_CTRL_SET_KEY:
641 gost_key(&(((struct ossl_gost_imit_ctx*)(ctx->md_data))->cctx),ptr) ;
642 ((struct ossl_gost_imit_ctx*)(ctx->md_data))->key_set = 1;
650 int gost_imit_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from)
652 memcpy(to->md_data,from->md_data,sizeof(struct ossl_gost_imit_ctx));
656 /* Clean up imit ctx */
657 int gost_imit_cleanup(EVP_MD_CTX *ctx)
659 memset(ctx->md_data,0,sizeof(struct ossl_gost_imit_ctx));