--- /dev/null
+/* crypto/dsa/dsa_ossl.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+/* 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>
+
+#ifndef OPENSSL_FIPS
+static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
+static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);
+static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
+ DSA *dsa);
+static int dsa_init(DSA *dsa);
+static int dsa_finish(DSA *dsa);
+static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
+ BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *in_mont);
+static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *m_ctx);
+
+static DSA_METHOD openssl_dsa_meth = {
+"OpenSSL DSA method",
+dsa_do_sign,
+dsa_sign_setup,
+dsa_do_verify,
+dsa_mod_exp,
+dsa_bn_mod_exp,
+dsa_init,
+dsa_finish,
+0,
+NULL
+};
+
+const DSA_METHOD *DSA_OpenSSL(void)
+{
+ return &openssl_dsa_meth;
+}
+
+static 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);
+
+ if (!dsa->p || !dsa->q || !dsa->g)
+ {
+ reason=DSA_R_MISSING_PARAMETERS;
+ goto err;
+ }
+
+ 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))
+ {
+ if (!DSA_sign_setup(dsa,ctx,&kinv,&r)) goto err;
+ }
+ 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);
+ }
+
+static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
+ {
+ BN_CTX *ctx;
+ BIGNUM k,*kinv=NULL,*r=NULL;
+ int ret=0;
+
+ if (!dsa->p || !dsa->q || !dsa->g)
+ {
+ DSAerr(DSA_F_DSA_SIGN_SETUP,DSA_R_MISSING_PARAMETERS);
+ return 0;
+ }
+
+ BN_init(&k);
+
+ if (ctx_in == NULL)
+ {
+ if ((ctx=BN_CTX_new()) == NULL) goto err;
+ }
+ else
+ ctx=ctx_in;
+
+ if ((r=BN_new()) == NULL) goto err;
+ kinv=NULL;
+
+ /* Get random k */
+ do
+ if (!BN_rand_range(&k, dsa->q)) goto err;
+ while (BN_is_zero(&k));
+
+ 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 (!dsa->meth->bn_mod_exp(dsa, 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;
+
+ 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)
+ {
+ 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 (ctx_in == NULL) BN_CTX_free(ctx);
+ if (kinv != NULL) BN_clear_free(kinv);
+ BN_clear_free(&k);
+ return(ret);
+ }
+
+static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
+ DSA *dsa)
+ {
+ BN_CTX *ctx;
+ BIGNUM u1,u2,t1;
+ BN_MONT_CTX *mont=NULL;
+ int ret = -1;
+ if (!dsa->p || !dsa->q || !dsa->g)
+ {
+ DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_MISSING_PARAMETERS);
+ return -1;
+ }
+
+ BN_init(&u1);
+ BN_init(&u2);
+ BN_init(&t1);
+
+ if ((ctx=BN_CTX_new()) == NULL) goto err;
+
+ if (BN_is_zero(sig->r) || sig->r->neg || BN_ucmp(sig->r, dsa->q) >= 0)
+ {
+ ret = 0;
+ goto err;
+ }
+ if (BN_is_zero(sig->s) || sig->s->neg || BN_ucmp(sig->s, dsa->q) >= 0)
+ {
+ ret = 0;
+ goto err;
+ }
+
+ /* Calculate W = inv(S) mod Q
+ * save W in u2 */
+ if ((BN_mod_inverse(&u2,sig->s,dsa->q,ctx)) == NULL) goto err;
+
+ /* save M in u1 */
+ if (BN_bin2bn(dgst,dgst_len,&u1) == NULL) goto err;
+
+ /* u1 = M * w mod q */
+ if (!BN_mod_mul(&u1,&u1,&u2,dsa->q,ctx)) goto err;
+
+ /* u2 = r * w mod q */
+ if (!BN_mod_mul(&u2,sig->r,&u2,dsa->q,ctx)) goto err;
+
+ 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;
+ }
+ mont=(BN_MONT_CTX *)dsa->method_mont_p;
+
+#if 0
+ {
+ BIGNUM t2;
+
+ BN_init(&t2);
+ /* v = ( g^u1 * y^u2 mod p ) mod q */
+ /* let t1 = g ^ u1 mod p */
+ if (!BN_mod_exp_mont(&t1,dsa->g,&u1,dsa->p,ctx,mont)) goto err;
+ /* let t2 = y ^ u2 mod p */
+ if (!BN_mod_exp_mont(&t2,dsa->pub_key,&u2,dsa->p,ctx,mont)) goto err;
+ /* let u1 = t1 * t2 mod p */
+ if (!BN_mod_mul(&u1,&t1,&t2,dsa->p,ctx)) goto err_bn;
+ BN_free(&t2);
+ }
+ /* let u1 = u1 mod q */
+ if (!BN_mod(&u1,&u1,dsa->q,ctx)) goto err;
+#else
+ {
+ if (!dsa->meth->dsa_mod_exp(dsa, &t1,dsa->g,&u1,dsa->pub_key,&u2,
+ dsa->p,ctx,mont)) goto err;
+ /* BN_copy(&u1,&t1); */
+ /* let u1 = u1 mod q */
+ if (!BN_mod(&u1,&t1,dsa->q,ctx)) goto err;
+ }
+#endif
+ /* V is now in u1. If the signature is correct, it will be
+ * equal to R. */
+ ret=(BN_ucmp(&u1, sig->r) == 0);
+
+ err:
+ if (ret != 1) DSAerr(DSA_F_DSA_DO_VERIFY,ERR_R_BN_LIB);
+ if (ctx != NULL) BN_CTX_free(ctx);
+ BN_free(&u1);
+ BN_free(&u2);
+ BN_free(&t1);
+ return(ret);
+ }
+
+static int dsa_init(DSA *dsa)
+{
+ dsa->flags|=DSA_FLAG_CACHE_MONT_P;
+ return(1);
+}
+
+static int dsa_finish(DSA *dsa)
+{
+ if(dsa->method_mont_p)
+ BN_MONT_CTX_free((BN_MONT_CTX *)dsa->method_mont_p);
+ return(1);
+}
+
+static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
+ BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *in_mont)
+{
+ return BN_mod_exp2_mont(rr, a1, p1, a2, p2, m, ctx, in_mont);
+}
+
+static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *m_ctx)
+{
+ return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
+}
+#endif
projects / bcm963xx.git / blobdiff