--- /dev/null
+/* crypto/ecdh/ech_ossl.c */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ *
+ * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
+ * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
+ * to the OpenSSL project.
+ *
+ * The ECC Code is licensed pursuant to the OpenSSL open source
+ * license provided below.
+ *
+ * The ECDH software is originally written by Douglas Stebila of
+ * Sun Microsystems Laboratories.
+ *
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2003 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 <string.h>
+#include <limits.h>
+
+#include "cryptlib.h"
+
+#include "ech_locl.h"
+#include <openssl/err.h>
+#include <openssl/sha.h>
+#include <openssl/obj_mac.h>
+#include <openssl/bn.h>
+
+static int ecdh_compute_key(void *out, size_t len, const EC_POINT *pub_key,
+ EC_KEY *ecdh,
+ void *(*KDF)(const void *in, size_t inlen, void *out, size_t *outlen));
+
+static ECDH_METHOD openssl_ecdh_meth = {
+ "OpenSSL ECDH method",
+ ecdh_compute_key,
+#if 0
+ NULL, /* init */
+ NULL, /* finish */
+#endif
+ 0, /* flags */
+ NULL /* app_data */
+};
+
+const ECDH_METHOD *ECDH_OpenSSL(void)
+ {
+ return &openssl_ecdh_meth;
+ }
+
+
+/* This implementation is based on the following primitives in the IEEE 1363 standard:
+ * - ECKAS-DH1
+ * - ECSVDP-DH
+ * Finally an optional KDF is applied.
+ */
+static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
+ EC_KEY *ecdh,
+ void *(*KDF)(const void *in, size_t inlen, void *out, size_t *outlen))
+ {
+ BN_CTX *ctx;
+ EC_POINT *tmp=NULL;
+ BIGNUM *x=NULL, *y=NULL;
+ const BIGNUM *priv_key;
+ const EC_GROUP* group;
+ int ret= -1;
+ size_t buflen, len;
+ unsigned char *buf=NULL;
+
+ if (outlen > INT_MAX)
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE); /* sort of, anyway */
+ return -1;
+ }
+
+ if ((ctx = BN_CTX_new()) == NULL) goto err;
+ BN_CTX_start(ctx);
+ x = BN_CTX_get(ctx);
+ y = BN_CTX_get(ctx);
+
+ priv_key = EC_KEY_get0_private_key(ecdh);
+ if (priv_key == NULL)
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_NO_PRIVATE_VALUE);
+ goto err;
+ }
+
+ group = EC_KEY_get0_group(ecdh);
+ if ((tmp=EC_POINT_new(group)) == NULL)
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (!EC_POINT_mul(group, tmp, NULL, pub_key, priv_key, ctx))
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE);
+ 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, x, y, ctx))
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE);
+ goto err;
+ }
+ }
+#ifndef OPENSSL_NO_EC2M
+ else
+ {
+ if (!EC_POINT_get_affine_coordinates_GF2m(group, tmp, x, y, ctx))
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE);
+ goto err;
+ }
+ }
+#endif
+
+ buflen = (EC_GROUP_get_degree(group) + 7)/8;
+ len = BN_num_bytes(x);
+ if (len > buflen)
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ if ((buf = OPENSSL_malloc(buflen)) == NULL)
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ memset(buf, 0, buflen - len);
+ if (len != (size_t)BN_bn2bin(x, buf + buflen - len))
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_BN_LIB);
+ goto err;
+ }
+
+ if (KDF != 0)
+ {
+ if (KDF(buf, buflen, out, &outlen) == NULL)
+ {
+ ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_KDF_FAILED);
+ goto err;
+ }
+ ret = outlen;
+ }
+ else
+ {
+ /* no KDF, just copy as much as we can */
+ if (outlen > buflen)
+ outlen = buflen;
+ memcpy(out, buf, outlen);
+ ret = outlen;
+ }
+
+err:
+ if (tmp) EC_POINT_free(tmp);
+ if (ctx) BN_CTX_end(ctx);
+ if (ctx) BN_CTX_free(ctx);
+ if (buf) OPENSSL_free(buf);
+ return(ret);
+ }
projects / cassiopeia.git / blobdiff