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openssl/engines/ccgost/gost_crypt.c

Index: openssl/engines/ccgost/gost_crypt.c
===================================================================
--- openssl/engines/ccgost/gost_crypt.c	(revision 0)
+++ openssl/engines/ccgost/gost_crypt.c	(revision 0)
@@ -0,0 +1,617 @@
+/**********************************************************************
+ *                          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 "gost89.h"
+#include <openssl/rand.h>
+#include "e_gost_err.h"
+#include "gost_lcl.h"
+static int gost_cipher_init(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);
+/* Handles block of data in CFB mode */			
+static int	gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
+	const unsigned char *in, size_t 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, size_t 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 */
+	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,
+	};
+
+EVP_CIPHER cipher_gost_cpacnt = 
+	{
+	NID_gost89_cnt,
+	1,/*block_size*/
+	32,/*key_size*/
+	8,/*iv_len */
+	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_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_cpa =
+	{
+	NID_id_Gost28147_89_MAC,
+	NID_undef,
+	4,
+	0,
+	gost_imit_init_cpa,
+	gost_imit_update,
+	gost_imit_final,
+	gost_imit_copy,
+	gost_imit_cleanup,
+	NULL,
+	NULL,
+	{0,0,0,0,0},
+	8,
+	sizeof(struct ossl_gost_imit_ctx), 
+	gost_imit_ctrl
+	};
+
+/* 
+ * 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_id_Gost28147_89_TestParamSet,&Gost28147_TestParamSet,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 = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
+		if (!params || !strlen(params)) 
+			return &gost_cipher_list[1];
+
+		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. */
+static 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 (ctx->app_data == NULL)
+		{
+		if (!gost_cipher_set_param(c,paramNID)) return 0;
+		ctx->app_data = ctx->cipher_data;
+		}
+	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;
+	}	
+
+static 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;
+	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 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]=(unsigned char)(g&0xff);
+	buf1[1]=(unsigned char)((g>>8)&0xff);
+	buf1[2]=(unsigned char)((g>>16)&0xff);
+	buf1[3]=(unsigned char)((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]=(unsigned char)(g&0xff);
+	buf1[5]=(unsigned char)((g>>8)&0xff);
+	buf1[6]=(unsigned char)((g>>16)&0xff);
+	buf1[7]=(unsigned char)((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, size_t inl)
+	{
+	const unsigned char *in_ptr=in;
+	unsigned char *out_ptr=out;
+	size_t i=0;
+	size_t j=0;
+/* 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,inl-i);
+		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;
+	}
+
+static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
+	const unsigned char *in, size_t inl)
+	{
+	const unsigned char *in_ptr=in;
+	unsigned char *out_ptr=out;
+	size_t i=0;
+	size_t 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(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
+	ctx->app_data = NULL;
+	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;
+		}
+		case EVP_CTRL_PBE_PRF_NID:
+			if (ptr) {
+				*((int *)ptr)=  NID_id_HMACGostR3411_94;
+				return 1;
+			} else {
+				return 0;
+			}	
+				
+		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;
+	struct ossl_gost_cipher_ctx *c=ctx->cipher_data;
+	if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE)
+		{
+		return ret;
+		}
+
+	p = params->value.sequence->data;
+
+	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;
+	}
+
+
+int gost_imit_init_cpa(EVP_MD_CTX *ctx)
+	{
+	struct ossl_gost_imit_ctx *c = ctx->md_data;
+	memset(c->buffer,0,sizeof(c->buffer));
+	memset(c->partial_block,0,sizeof(c->partial_block));
+	c->count = 0;
+	c->bytes_left=0;
+	c->key_meshing=1;
+	gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
+	return 1;
+	}
+
+static void mac_block_mesh(struct ossl_gost_imit_ctx *c,const unsigned char *data)
+	{
+	unsigned 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)) {
+		GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_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->key_set) {
+		GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
+		return 0;
+	}
+	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_KEY_LEN:
+			*((unsigned int*)(ptr)) = 32;
+			return 1;
+		case EVP_MD_CTRL_SET_KEY:
+		{
+		if (arg!=32) {
+			GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
+			return 0;
+		}
+
+		gost_key(&(((struct ossl_gost_imit_ctx*)(ctx->md_data))->cctx),ptr)	;
+		((struct ossl_gost_imit_ctx*)(ctx->md_data))->key_set = 1;
+		return 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;
+	}
+