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openssl/engines/ccgost/gost_sign.c

Index: openssl/engines/ccgost/gost_sign.c
===================================================================
--- openssl/engines/ccgost/gost_sign.c	(revision 0)
+++ openssl/engines/ccgost/gost_sign.c	(revision 0)
@@ -0,0 +1,321 @@
+/**********************************************************************
+ *                          gost_sign.c                               *
+ *             Copyright (c) 2005-2006 Cryptocom LTD                  *
+ *         This file is distributed under the same license as OpenSSL *
+ *                                                                    *
+ *       Implementation of GOST R 34.10-94 signature algorithm        *
+ *       for OpenSSL                                                  *
+ *          Requires OpenSSL 0.9.9 for compilation                    *
+ **********************************************************************/
+#include <string.h>
+#include <openssl/rand.h>
+#include <openssl/bn.h>
+#include <openssl/dsa.h>
+#include <openssl/evp.h>
+
+#include "gost_params.h"
+#include "gost_lcl.h"
+#include "e_gost_err.h"
+
+#ifdef DEBUG_SIGN
+void dump_signature(const char *message,const unsigned char *buffer,size_t len)
+	{
+	size_t i;
+	fprintf(stderr,"signature %s Length=%d",message,len);
+	for (i=0; i<len; i++)
+		{
+		if (i% 16 ==0) fputc('\n',stderr);
+		fprintf (stderr," %02x",buffer[i]);
+		}
+	fprintf(stderr,"\nEnd of signature\n");
+	}
+
+void dump_dsa_sig(const char *message, DSA_SIG *sig)
+	{
+	fprintf(stderr,"%s\nR=",message);
+	BN_print_fp(stderr,sig->r);
+	fprintf(stderr,"\nS=");
+	BN_print_fp(stderr,sig->s);
+	fprintf(stderr,"\n");
+	}
+
+#else
+
+#define dump_signature(a,b,c)
+#define dump_dsa_sig(a,b)
+#endif
+
+/*
+ * Computes signature and returns it as DSA_SIG structure
+ */
+DSA_SIG *gost_do_sign(const unsigned char *dgst,int dlen, DSA *dsa)
+	{
+	BIGNUM *k=NULL,*tmp=NULL,*tmp2=NULL;
+	DSA_SIG *newsig = DSA_SIG_new();
+	BIGNUM *md = hashsum2bn(dgst);
+	/* check if H(M) mod q is zero */
+	BN_CTX *ctx=BN_CTX_new();
+	BN_CTX_start(ctx);
+	if (!newsig)
+		{
+		GOSTerr(GOST_F_GOST_DO_SIGN,GOST_R_NO_MEMORY);
+		goto err;
+		}	
+	tmp=BN_CTX_get(ctx);
+	k = BN_CTX_get(ctx);
+	tmp2 = BN_CTX_get(ctx);
+	BN_mod(tmp,md,dsa->q,ctx);
+	if (BN_is_zero(tmp))
+		{
+		BN_one(md);
+		}	
+	do
+		{
+		do
+			{
+			/*Generate random number k less than q*/
+			BN_rand_range(k,dsa->q);
+			/* generate r = (a^x mod p) mod q */
+			BN_mod_exp(tmp,dsa->g, k, dsa->p,ctx);
+			if (!(newsig->r)) newsig->r=BN_new();
+			BN_mod(newsig->r,tmp,dsa->q,ctx);
+			}
+		while (BN_is_zero(newsig->r));
+		/* generate s = (xr + k(Hm)) mod q */
+		BN_mod_mul(tmp,dsa->priv_key,newsig->r,dsa->q,ctx);
+		BN_mod_mul(tmp2,k,md,dsa->q,ctx);
+		if (!newsig->s) newsig->s=BN_new();
+		BN_mod_add(newsig->s,tmp,tmp2,dsa->q,ctx);
+		}
+	while (BN_is_zero(newsig->s));		
+	err:
+	BN_free(md);
+	BN_CTX_end(ctx);
+	BN_CTX_free(ctx);
+	return newsig;
+	}	
+
+
+/*
+ * Packs signature according to Cryptocom rules
+ * and frees up DSA_SIG structure
+ */
+/*
+int pack_sign_cc(DSA_SIG *s,int order,unsigned char *sig, size_t *siglen)
+	{
+	*siglen = 2*order;
+	memset(sig,0,*siglen);
+	store_bignum(s->r, sig,order);
+	store_bignum(s->s, sig + order,order);
+	dump_signature("serialized",sig,*siglen);
+	DSA_SIG_free(s);
+	return 1;
+	}
+*/
+/*
+ * Packs signature according to Cryptopro rules
+ * and frees up DSA_SIG structure
+ */
+int pack_sign_cp(DSA_SIG *s,int order,unsigned char *sig, size_t *siglen)
+	{
+	*siglen = 2*order;
+	memset(sig,0,*siglen);
+	store_bignum(s->s, sig, order);
+	store_bignum(s->r, sig+order,order);
+	dump_signature("serialized",sig,*siglen);
+	DSA_SIG_free(s);
+	return 1;
+	}
+
+/*
+ * Verifies signature passed as DSA_SIG structure
+ *
+ */
+
+int gost_do_verify(const unsigned char *dgst, int dgst_len,
+	DSA_SIG *sig, DSA *dsa)
+	{
+	BIGNUM *md, *tmp=NULL;
+	BIGNUM *q2=NULL;
+	BIGNUM *u=NULL,*v=NULL,*z1=NULL,*z2=NULL;
+	BIGNUM *tmp2=NULL,*tmp3=NULL;
+	int ok;
+	BN_CTX *ctx = BN_CTX_new();
+
+	BN_CTX_start(ctx);
+	if (BN_cmp(sig->s,dsa->q)>=1||
+		BN_cmp(sig->r,dsa->q)>=1)
+		{
+		GOSTerr(GOST_F_GOST_DO_VERIFY,GOST_R_SIGNATURE_PARTS_GREATER_THAN_Q);
+		return 0;
+		}
+	md=hashsum2bn(dgst);
+	
+	tmp=BN_CTX_get(ctx);
+	v=BN_CTX_get(ctx);
+	q2=BN_CTX_get(ctx);
+	z1=BN_CTX_get(ctx);
+	z2=BN_CTX_get(ctx);
+	tmp2=BN_CTX_get(ctx);
+	tmp3=BN_CTX_get(ctx);
+	u = BN_CTX_get(ctx);
+	
+	BN_mod(tmp,md,dsa->q,ctx);
+	if (BN_is_zero(tmp))
+		{
+		BN_one(md);
+		}
+	BN_copy(q2,dsa->q);
+	BN_sub_word(q2,2);
+	BN_mod_exp(v,md,q2,dsa->q,ctx);
+	BN_mod_mul(z1,sig->s,v,dsa->q,ctx);
+	BN_sub(tmp,dsa->q,sig->r);
+	BN_mod_mul(z2,tmp,v,dsa->p,ctx);
+	BN_mod_exp(tmp,dsa->g,z1,dsa->p,ctx);
+	BN_mod_exp(tmp2,dsa->pub_key,z2,dsa->p,ctx);
+	BN_mod_mul(tmp3,tmp,tmp2,dsa->p,ctx);
+	BN_mod(u,tmp3,dsa->q,ctx);
+	ok= BN_cmp(u,sig->r);
+	
+	BN_free(md);
+	BN_CTX_end(ctx);
+	BN_CTX_free(ctx);
+	if (ok!=0)
+		{
+		GOSTerr(GOST_F_GOST_DO_VERIFY,GOST_R_SIGNATURE_MISMATCH);
+		}	
+	return (ok==0);
+	}
+
+/*
+ * Computes public keys for GOST R 34.10-94 algorithm
+ *
+ */
+int gost94_compute_public(DSA *dsa)
+	{
+	/* Now fill algorithm parameters with correct values */
+	BN_CTX *ctx = BN_CTX_new();
+	if (!dsa->g)
+		{
+		GOSTerr(GOST_F_GOST94_COMPUTE_PUBLIC,GOST_R_KEY_IS_NOT_INITALIZED);
+		return 0;
+		}	
+	/* Compute public key  y = a^x mod p */
+	dsa->pub_key=BN_new();
+	BN_mod_exp(dsa->pub_key, dsa->g,dsa->priv_key,dsa->p,ctx);
+	BN_CTX_free(ctx);
+	return 1;
+	}
+
+/*
+ * Fill GOST 94 params, searching them in R3410_paramset array
+ * by nid of paramset
+ *
+ */
+int fill_GOST94_params(DSA *dsa,int nid)
+	{
+	R3410_params *params=R3410_paramset;
+	while (params->nid!=NID_undef && params->nid !=nid) params++;
+	if (params->nid == NID_undef)
+		{
+		GOSTerr(GOST_F_FILL_GOST94_PARAMS,GOST_R_UNSUPPORTED_PARAMETER_SET);
+		return 0;
+		}	
+#define dump_signature(a,b,c)
+	if (dsa->p) { BN_free(dsa->p); }
+	dsa->p=NULL;
+	BN_dec2bn(&(dsa->p),params->p);
+	if (dsa->q) { BN_free(dsa->q); }
+	dsa->q=NULL;
+	BN_dec2bn(&(dsa->q),params->q);
+	if (dsa->g) { BN_free(dsa->g); }
+	dsa->g=NULL;
+	BN_dec2bn(&(dsa->g),params->a);
+	return 1;
+	}	
+
+/*
+ *  Generate GOST R 34.10-94 keypair
+ *
+ *
+ */
+int gost_sign_keygen(DSA *dsa)
+	{
+	dsa->priv_key = BN_new();
+	BN_rand_range(dsa->priv_key,dsa->q);
+	return gost94_compute_public( dsa);
+	}
+
+/* Unpack signature according to cryptocom rules  */
+/*
+DSA_SIG *unpack_cc_signature(const unsigned char *sig,size_t siglen)
+	{
+	DSA_SIG *s;
+	s = DSA_SIG_new();
+	if (s == NULL)
+		{
+		GOSTerr(GOST_F_UNPACK_CC_SIGNATURE,GOST_R_NO_MEMORY);
+		return(NULL);
+		}
+	s->r = getbnfrombuf(sig, siglen/2);
+	s->s = getbnfrombuf(sig + siglen/2, siglen/2);
+	return s;
+	}
+*/
+/* Unpack signature according to cryptopro rules  */
+DSA_SIG *unpack_cp_signature(const unsigned char *sig,size_t siglen)
+	{
+	DSA_SIG *s;
+
+	s = DSA_SIG_new();
+	if (s == NULL)
+		{
+		GOSTerr(GOST_F_UNPACK_CP_SIGNATURE,GOST_R_NO_MEMORY);
+		return NULL;
+		}
+	s->s = getbnfrombuf(sig , siglen/2);
+	s->r = getbnfrombuf(sig + siglen/2, siglen/2);
+	return s;
+	}
+
+/* Convert little-endian byte array into bignum */
+BIGNUM *hashsum2bn(const unsigned char *dgst)
+	{
+	unsigned char buf[32];
+	int i;
+	for (i=0;i<32;i++)
+		{
+		buf[31-i]=dgst[i];
+		}
+	return getbnfrombuf(buf,32);
+	}
+
+/* Convert byte buffer to bignum, skipping leading zeros*/
+BIGNUM *getbnfrombuf(const unsigned char *buf,size_t len)
+	{
+	while (*buf==0&&len>0)
+		{
+		buf++; len--;
+		}
+	if (len)
+		{
+		return BN_bin2bn(buf,len,NULL);
+		}
+	else
+		{
+		BIGNUM *b=BN_new();
+		BN_zero(b);
+		return b;
+		}
+	}
+
+/* Pack bignum into byte buffer of given size, filling all leading bytes
+ * by zeros */
+int store_bignum(BIGNUM *bn, unsigned char *buf,int len)
+	{
+	int bytes = BN_num_bytes(bn);
+	if (bytes>len) return 0;
+	memset(buf,0,len);
+	BN_bn2bin(bn,buf+len-bytes);
+	return 1;
+	}