Initial import

1 files changed, 480 insertions, 0 deletions

diff --git a/openssl/crypto/ecdsa/ecs_ossl.c b/openssl/crypto/ecdsa/ecs_ossl.c
new file mode 100644
index 00000000..1bbf328d
--- /dev/null
+++ b/openssl/crypto/ecdsa/ecs_ossl.c
@@ -0,0 +1,480 @@
+/* crypto/ecdsa/ecs_ossl.c */
+/*
+ * Written by Nils Larsch for the OpenSSL project
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2004 The OpenSSL Project.  All rights reserved.
+ *
+ * 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 above 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 acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include "ecs_locl.h"
+#include <openssl/err.h>
+#include <openssl/obj_mac.h>
+#include <openssl/bn.h>
+
+static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen, 
+		const BIGNUM *, const BIGNUM *, EC_KEY *eckey);
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, 
+		BIGNUM **rp);
+static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len, 
+		const ECDSA_SIG *sig, EC_KEY *eckey);
+
+static ECDSA_METHOD openssl_ecdsa_meth = {
+	"OpenSSL ECDSA method",
+	ecdsa_do_sign,
+	ecdsa_sign_setup,
+	ecdsa_do_verify,
+#if 0
+	NULL, /* init     */
+	NULL, /* finish   */
+#endif
+	0,    /* flags    */
+	NULL  /* app_data */
+};
+
+const ECDSA_METHOD *ECDSA_OpenSSL(void)
+{
+	return &openssl_ecdsa_meth;
+}
+
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
+		BIGNUM **rp)
+{
+	BN_CTX   *ctx = NULL;
+	BIGNUM	 *k = NULL, *r = NULL, *order = NULL, *X = NULL;
+	EC_POINT *tmp_point=NULL;
+	const EC_GROUP *group;
+	int 	 ret = 0;
+
+	if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+	}
+
+	if (ctx_in == NULL) 
+	{
+		if ((ctx = BN_CTX_new()) == NULL)
+		{
+			ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_MALLOC_FAILURE);
+			return 0;
+		}
+	}
+	else
+		ctx = ctx_in;
+
+	k     = BN_new();	/* this value is later returned in *kinvp */
+	r     = BN_new();	/* this value is later returned in *rp    */
+	order = BN_new();
+	X     = BN_new();
+	if (!k || !r || !order || !X)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
+		goto err;
+	}
+	if ((tmp_point = EC_POINT_new(group)) == NULL)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+		goto err;
+	}
+	if (!EC_GROUP_get_order(group, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+		goto err;
+	}
+	
+	do
+	{
+		/* get random k */	
+		do
+			if (!BN_rand_range(k, order))
+			{
+				ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
+				 ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);	
+				goto err;
+			}
+		while (BN_is_zero(k));
+
+		/* We do not want timing information to leak the length of k,
+		 * so we compute G*k using an equivalent scalar of fixed
+		 * bit-length. */
+
+		if (!BN_add(k, k, order)) goto err;
+		if (BN_num_bits(k) <= BN_num_bits(order))
+			if (!BN_add(k, k, order)) goto err;
+
+		/* compute r the x-coordinate of generator * k */
+		if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+			goto err;
+		}
+		if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field)
+		{
+			if (!EC_POINT_get_affine_coordinates_GFp(group,
+				tmp_point, X, NULL, ctx))
+			{
+				ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_EC_LIB);
+				goto err;
+			}
+		}
+		else /* NID_X9_62_characteristic_two_field */
+		{
+			if (!EC_POINT_get_affine_coordinates_GF2m(group,
+				tmp_point, X, NULL, ctx))
+			{
+				ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_EC_LIB);
+				goto err;
+			}
+		}
+		if (!BN_nnmod(r, X, order, ctx))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+			goto err;
+		}
+	}
+	while (BN_is_zero(r));
+
+	/* compute the inverse of k */
+	if (!BN_mod_inverse(k, k, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+		goto err;	
+	}
+	/* clear old values if necessary */
+	if (*rp != NULL)
+		BN_clear_free(*rp);
+	if (*kinvp != NULL) 
+		BN_clear_free(*kinvp);
+	/* save the pre-computed values  */
+	*rp    = r;
+	*kinvp = k;
+	ret = 1;
+err:
+	if (!ret)
+	{
+		if (k != NULL) BN_clear_free(k);
+		if (r != NULL) BN_clear_free(r);
+	}
+	if (ctx_in == NULL) 
+		BN_CTX_free(ctx);
+	if (order != NULL)
+		BN_free(order);
+	if (tmp_point != NULL) 
+		EC_POINT_free(tmp_point);
+	if (X)
+		BN_clear_free(X);
+	return(ret);
+}
+
+
+static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len, 
+		const BIGNUM *in_kinv, const BIGNUM *in_r, EC_KEY *eckey)
+{
+	int     ok = 0, i;
+	BIGNUM *kinv=NULL, *s, *m=NULL,*tmp=NULL,*order=NULL;
+	const BIGNUM *ckinv;
+	BN_CTX     *ctx = NULL;
+	const EC_GROUP   *group;
+	ECDSA_SIG  *ret;
+	ECDSA_DATA *ecdsa;
+	const BIGNUM *priv_key;
+
+	ecdsa    = ecdsa_check(eckey);
+	group    = EC_KEY_get0_group(eckey);
+	priv_key = EC_KEY_get0_private_key(eckey);
+	
+	if (group == NULL || priv_key == NULL || ecdsa == NULL)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_PASSED_NULL_PARAMETER);
+		return NULL;
+	}
+
+	ret = ECDSA_SIG_new();
+	if (!ret)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
+		return NULL;
+	}
+	s = ret->s;
+
+	if ((ctx = BN_CTX_new()) == NULL || (order = BN_new()) == NULL ||
+		(tmp = BN_new()) == NULL || (m = BN_new()) == NULL)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
+		goto err;
+	}
+
+	if (!EC_GROUP_get_order(group, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB);
+		goto err;
+	}
+	i = BN_num_bits(order);
+	/* Need to truncate digest if it is too long: first truncate whole
+	 * bytes.
+	 */
+	if (8 * dgst_len > i)
+		dgst_len = (i + 7)/8;
+	if (!BN_bin2bn(dgst, dgst_len, m))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+		goto err;
+	}
+	/* If still too long truncate remaining bits with a shift */
+	if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7)))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+		goto err;
+	}
+	do
+	{
+		if (in_kinv == NULL || in_r == NULL)
+		{
+			if (!ECDSA_sign_setup(eckey, ctx, &kinv, &ret->r))
+			{
+				ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,ERR_R_ECDSA_LIB);
+				goto err;
+			}
+			ckinv = kinv;
+		}
+		else
+		{
+			ckinv  = in_kinv;
+			if (BN_copy(ret->r, in_r) == NULL)
+			{
+				ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
+				goto err;
+			}
+		}
+
+		if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+			goto err;
+		}
+		if (!BN_mod_add_quick(s, tmp, m, order))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+			goto err;
+		}
+		if (!BN_mod_mul(s, s, ckinv, order, ctx))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+			goto err;
+		}
+		if (BN_is_zero(s))
+		{
+			/* if kinv and r have been supplied by the caller
+			 * don't to generate new kinv and r values */
+			if (in_kinv != NULL && in_r != NULL)
+			{
+				ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ECDSA_R_NEED_NEW_SETUP_VALUES);
+				goto err;
+			}
+		}
+		else
+			/* s != 0 => we have a valid signature */
+			break;
+	}
+	while (1);
+
+	ok = 1;
+err:
+	if (!ok)
+	{
+		ECDSA_SIG_free(ret);
+		ret = NULL;
+	}
+	if (ctx)
+		BN_CTX_free(ctx);
+	if (m)
+		BN_clear_free(m);
+	if (tmp)
+		BN_clear_free(tmp);
+	if (order)
+		BN_free(order);
+	if (kinv)
+		BN_clear_free(kinv);
+	return ret;
+}
+
+static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
+		const ECDSA_SIG *sig, EC_KEY *eckey)
+{
+	int ret = -1, i;
+	BN_CTX   *ctx;
+	BIGNUM   *order, *u1, *u2, *m, *X;
+	EC_POINT *point = NULL;
+	const EC_GROUP *group;
+	const EC_POINT *pub_key;
+
+	/* check input values */
+	if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
+	    (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_MISSING_PARAMETERS);
+		return -1;
+	}
+
+	ctx = BN_CTX_new();
+	if (!ctx)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
+		return -1;
+	}
+	BN_CTX_start(ctx);
+	order = BN_CTX_get(ctx);	
+	u1    = BN_CTX_get(ctx);
+	u2    = BN_CTX_get(ctx);
+	m     = BN_CTX_get(ctx);
+	X     = BN_CTX_get(ctx);
+	if (!X)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+	
+	if (!EC_GROUP_get_order(group, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+		goto err;
+	}
+
+	if (BN_is_zero(sig->r)          || BN_is_negative(sig->r) || 
+	    BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s)  ||
+	    BN_is_negative(sig->s)      || BN_ucmp(sig->s, order) >= 0)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_BAD_SIGNATURE);
+		ret = 0;	/* signature is invalid */
+		goto err;
+	}
+	/* calculate tmp1 = inv(S) mod order */
+	if (!BN_mod_inverse(u2, sig->s, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+	/* digest -> m */
+	i = BN_num_bits(order);
+	/* Need to truncate digest if it is too long: first truncate whole
+	 * bytes.
+	 */
+	if (8 * dgst_len > i)
+		dgst_len = (i + 7)/8;
+	if (!BN_bin2bn(dgst, dgst_len, m))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+	/* If still too long truncate remaining bits with a shift */
+	if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7)))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+	/* u1 = m * tmp mod order */
+	if (!BN_mod_mul(u1, m, u2, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+	/* u2 = r * w mod q */
+	if (!BN_mod_mul(u2, sig->r, u2, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+
+	if ((point = EC_POINT_new(group)) == NULL)
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
+		goto err;
+	}
+	if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+		goto err;
+	}
+	if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field)
+	{
+		if (!EC_POINT_get_affine_coordinates_GFp(group,
+			point, X, NULL, ctx))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+			goto err;
+		}
+	}
+	else /* NID_X9_62_characteristic_two_field */
+	{
+		if (!EC_POINT_get_affine_coordinates_GF2m(group,
+			point, X, NULL, ctx))
+		{
+			ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+			goto err;
+		}
+	}
+	
+	if (!BN_nnmod(u1, X, order, ctx))
+	{
+		ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+		goto err;
+	}
+	/*  if the signature is correct u1 is equal to sig->r */
+	ret = (BN_ucmp(u1, sig->r) == 0);
+err:
+	BN_CTX_end(ctx);
+	BN_CTX_free(ctx);
+	if (point)
+		EC_POINT_free(point);
+	return ret;
+}