#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_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");
- }
+{
+ 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)
+# 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;
- }
-
+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
*/
/*-
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;
- }
+ {
+ *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;
- }
+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();
+ 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_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);
- }
+ 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;
- }
+{
+ /* 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;
- }
+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;
- }
+ 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);
- }
+{
+ 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;
- }
+ {
+ 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;
+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;
- }
+ 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);
- }
+{
+ 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;
- }
- }
+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;
- }
+/*
+ * 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;
+}
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