/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
-#include <stdio.h>
#include "cryptlib.h"
-#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/rand.h>
-#include <openssl/asn1.h>
+#include <openssl/bn.h>
DSA_SIG * DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
{
- BIGNUM *kinv=NULL,*r=NULL,*s=NULL;
- BIGNUM m;
- BIGNUM xr;
- BN_CTX *ctx=NULL;
- int i,reason=ERR_R_BN_LIB;
- DSA_SIG *ret=NULL;
-
- BN_init(&m);
- BN_init(&xr);
- s=BN_new();
- if (s == NULL) goto err;
-
- i=BN_num_bytes(dsa->q); /* should be 20 */
- if ((dlen > i) || (dlen > 50))
- {
- reason=DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE;
- goto err;
- }
-
- ctx=BN_CTX_new();
- if (ctx == NULL) goto err;
-
- if ((dsa->kinv == NULL) || (dsa->r == NULL))
+#ifdef OPENSSL_FIPS
+ if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
+ && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
{
- if (!DSA_sign_setup(dsa,ctx,&kinv,&r)) goto err;
+ DSAerr(DSA_F_DSA_DO_SIGN, DSA_R_NON_FIPS_DSA_METHOD);
+ return NULL;
}
- else
- {
- kinv=dsa->kinv;
- dsa->kinv=NULL;
- r=dsa->r;
- dsa->r=NULL;
- }
-
- if (BN_bin2bn(dgst,dlen,&m) == NULL) goto err;
-
- /* Compute s = inv(k) (m + xr) mod q */
- if (!BN_mod_mul(&xr,dsa->priv_key,r,dsa->q,ctx)) goto err;/* s = xr */
- if (!BN_add(s, &xr, &m)) goto err; /* s = m + xr */
- if (BN_cmp(s,dsa->q) > 0)
- BN_sub(s,s,dsa->q);
- if (!BN_mod_mul(s,s,kinv,dsa->q,ctx)) goto err;
-
- ret=DSA_SIG_new();
- if (ret == NULL) goto err;
- ret->r = r;
- ret->s = s;
-
-err:
- if (!ret)
- {
- DSAerr(DSA_F_DSA_DO_SIGN,reason);
- BN_free(r);
- BN_free(s);
- }
- if (ctx != NULL) BN_CTX_free(ctx);
- BN_clear_free(&m);
- BN_clear_free(&xr);
- if (kinv != NULL) /* dsa->kinv is NULL now if we used it */
- BN_clear_free(kinv);
- return(ret);
+#endif
+ return dsa->meth->dsa_do_sign(dgst, dlen, dsa);
}
-/* data has already been hashed (probably with SHA or SHA-1). */
-
-/* unsigned char *sig: out */
-/* unsigned int *siglen: out */
-int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
- unsigned int *siglen, DSA *dsa)
+int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
{
- DSA_SIG *s;
- s=DSA_do_sign(dgst,dlen,dsa);
- if (s == NULL)
+#ifdef OPENSSL_FIPS
+ if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
+ && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
{
- *siglen=0;
- return(0);
+ DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_NON_FIPS_DSA_METHOD);
+ return 0;
}
- *siglen=i2d_DSA_SIG(s,&sig);
- DSA_SIG_free(s);
- return(1);
+#endif
+ return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp);
}
-int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
+DSA_SIG *DSA_SIG_new(void)
{
- BN_CTX *ctx;
- BIGNUM k,*kinv=NULL,*r=NULL;
- int ret=0;
-
- if (ctx_in == NULL)
- {
- if ((ctx=BN_CTX_new()) == NULL) goto err;
- }
- else
- ctx=ctx_in;
-
- BN_init(&k);
- if ((r=BN_new()) == NULL) goto err;
- kinv=NULL;
-
- /* Get random k */
- for (;;)
- {
- if (!BN_rand(&k, BN_num_bits(dsa->q), 1, 0)) goto err;
- if (BN_cmp(&k,dsa->q) >= 0)
- BN_sub(&k,&k,dsa->q);
- if (!BN_is_zero(&k)) break;
- }
-
- if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P))
- {
- if ((dsa->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
- if (!BN_MONT_CTX_set((BN_MONT_CTX *)dsa->method_mont_p,
- dsa->p,ctx)) goto err;
- }
-
- /* Compute r = (g^k mod p) mod q */
- if (!BN_mod_exp_mont(r,dsa->g,&k,dsa->p,ctx,
- (BN_MONT_CTX *)dsa->method_mont_p)) goto err;
- if (!BN_mod(r,r,dsa->q,ctx)) goto err;
-
- /* Compute part of 's = inv(k) (m + xr) mod q' */
- if ((kinv=BN_mod_inverse(NULL,&k,dsa->q,ctx)) == NULL) goto err;
+ DSA_SIG *sig;
+ sig = OPENSSL_malloc(sizeof(DSA_SIG));
+ if (!sig)
+ return NULL;
+ sig->r = NULL;
+ sig->s = NULL;
+ return sig;
+ }
- if (*kinvp != NULL) BN_clear_free(*kinvp);
- *kinvp=kinv;
- kinv=NULL;
- if (*rp != NULL) BN_clear_free(*rp);
- *rp=r;
- ret=1;
-err:
- if (!ret)
+void DSA_SIG_free(DSA_SIG *sig)
+ {
+ if (sig)
{
- DSAerr(DSA_F_DSA_SIGN_SETUP,ERR_R_BN_LIB);
- if (kinv != NULL) BN_clear_free(kinv);
- if (r != NULL) BN_clear_free(r);
+ if (sig->r)
+ BN_free(sig->r);
+ if (sig->s)
+ BN_free(sig->s);
+ OPENSSL_free(sig);
}
- if (ctx_in == NULL) BN_CTX_free(ctx);
- if (kinv != NULL) BN_clear_free(kinv);
- BN_clear_free(&k);
- return(ret);
}
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