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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
commit3562e78743202e43aec8727005182a2558117eca (patch)
tree8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/fips/dsa/fips_dsa_ossl.c
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Diffstat (limited to 'openssl/fips/dsa/fips_dsa_ossl.c')
-rw-r--r--openssl/fips/dsa/fips_dsa_ossl.c435
1 files changed, 435 insertions, 0 deletions
diff --git a/openssl/fips/dsa/fips_dsa_ossl.c b/openssl/fips/dsa/fips_dsa_ossl.c
new file mode 100644
index 000000000..50a6c1331
--- /dev/null
+++ b/openssl/fips/dsa/fips_dsa_ossl.c
@@ -0,0 +1,435 @@
+/* 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 <openssl/bn.h>
+#include <openssl/dsa.h>
+#include <openssl/rand.h>
+#include <openssl/asn1.h>
+#include <openssl/err.h>
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
+#include <openssl/fips.h>
+
+#ifdef OPENSSL_FIPS
+
+static DSA_SIG *dsa_do_sign(const unsigned char *dgst, FIPS_DSA_SIZE_T 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, FIPS_DSA_SIZE_T 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 const DSA_METHOD openssl_dsa_meth = {
+"OpenSSL FIPS DSA method",
+dsa_do_sign,
+dsa_sign_setup,
+dsa_do_verify,
+dsa_mod_exp,
+dsa_bn_mod_exp,
+dsa_init,
+dsa_finish,
+DSA_FLAG_FIPS_METHOD,
+NULL
+};
+#if 0
+int FIPS_dsa_check(struct dsa_st *dsa)
+ {
+ if(dsa->meth != &openssl_dsa_meth || dsa->meth->dsa_do_sign != dsa_do_sign
+ || dsa->meth->dsa_sign_setup != dsa_sign_setup
+ || dsa->meth->dsa_mod_exp != dsa_mod_exp
+ || dsa->meth->bn_mod_exp != dsa_bn_mod_exp
+ || dsa->meth->init != dsa_init
+ || dsa->meth->finish != dsa_finish)
+ {
+ FIPSerr(FIPS_F_FIPS_DSA_CHECK,FIPS_R_NON_FIPS_METHOD);
+ return 0;
+ }
+ return 1;
+ }
+#endif
+
+const DSA_METHOD *DSA_OpenSSL(void)
+{
+ return &openssl_dsa_meth;
+}
+
+static DSA_SIG *dsa_do_sign(const unsigned char *dgst, FIPS_DSA_SIZE_T 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;
+
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_DSA_DO_SIGN,FIPS_R_FIPS_SELFTEST_FAILED);
+ return NULL;
+ }
+
+ if (FIPS_mode() && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
+ {
+ DSAerr(DSA_F_DSA_DO_SIGN, DSA_R_KEY_SIZE_TOO_SMALL);
+ return 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->meth->dsa_sign_setup(dsa,ctx,&kinv,&r)) goto err;
+
+ 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,kq,*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);
+ BN_init(&kq);
+
+ if (ctx_in == NULL)
+ {
+ if ((ctx=BN_CTX_new()) == NULL) goto err;
+ }
+ else
+ ctx=ctx_in;
+
+ if ((r=BN_new()) == NULL) goto err;
+
+ /* Get random k */
+ do
+ if (!BN_rand_range(&k, dsa->q)) goto err;
+ while (BN_is_zero(&k));
+ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
+ {
+ BN_set_flags(&k, BN_FLG_CONSTTIME);
+ }
+
+ if (dsa->flags & DSA_FLAG_CACHE_MONT_P)
+ {
+ if (!BN_MONT_CTX_set_locked((BN_MONT_CTX **)&dsa->method_mont_p,
+ CRYPTO_LOCK_DSA,
+ dsa->p, ctx))
+ goto err;
+ }
+
+ /* Compute r = (g^k mod p) mod q */
+
+ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
+ {
+ if (!BN_copy(&kq, &k)) goto err;
+
+ /* We do not want timing information to leak the length of k,
+ * so we compute g^k using an equivalent exponent of fixed length.
+ *
+ * (This is a kludge that we need because the BN_mod_exp_mont()
+ * does not let us specify the desired timing behaviour.) */
+
+ if (!BN_add(&kq, &kq, dsa->q)) goto err;
+ if (BN_num_bits(&kq) <= BN_num_bits(dsa->q))
+ {
+ if (!BN_add(&kq, &kq, dsa->q)) goto err;
+ }
+
+ K = &kq;
+ }
+ else
+ {
+ K = &k;
+ }
+ 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);
+ BN_clear_free(&kq);
+ return(ret);
+ }
+
+static int dsa_do_verify(const unsigned char *dgst, FIPS_DSA_SIZE_T 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;
+ }
+
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_DSA_DO_VERIFY,FIPS_R_FIPS_SELFTEST_FAILED);
+ return -1;
+ }
+
+ if (BN_num_bits(dsa->q) != 160)
+ {
+ DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_BAD_Q_VALUE);
+ return -1;
+ }
+
+ if (BN_num_bits(dsa->p) > OPENSSL_DSA_MAX_MODULUS_BITS)
+ {
+ DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_MODULUS_TOO_LARGE);
+ return -1;
+ }
+
+ if (FIPS_mode() && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
+ {
+ DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_KEY_SIZE_TOO_SMALL);
+ 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->flags & DSA_FLAG_CACHE_MONT_P)
+ {
+ mont = BN_MONT_CTX_set_locked(
+ (BN_MONT_CTX **)&dsa->method_mont_p,
+ CRYPTO_LOCK_DSA, dsa->p, ctx);
+ if (!mont)
+ goto err;
+ }
+
+#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)
+{
+ FIPS_selftest_check();
+ 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);
+}
+
+#else /* ndef OPENSSL_FIPS */
+
+static void *dummy=&dummy;
+
+#endif /* ndef OPENSSL_FIPS */