Inital import.
Initial fork from f2d678e6e89b6508147086610e985d4e8416e867 (1.0.2 beta).
(This change contains substantial changes from the original and
effectively starts a new history.)
diff --git a/crypto/ecdh/ecdh.c b/crypto/ecdh/ecdh.c
new file mode 100644
index 0000000..c64a0ad
--- /dev/null
+++ b/crypto/ecdh/ecdh.c
@@ -0,0 +1,218 @@
+/* ====================================================================
+ * 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) 2000-2002 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
+ * licensing@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 <openssl/ecdh.h>
+
+#include <openssl/bn.h>
+#include <openssl/digest.h>
+#include <openssl/err.h>
+#include <openssl/mem.h>
+
+
+int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
+ EC_KEY *priv_key, 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;
+ const EC_GROUP *group;
+ int ret = -1;
+ size_t buflen, len;
+ uint8_t *buf = NULL;
+
+ if ((ctx = BN_CTX_new()) == NULL) {
+ goto err;
+ }
+ BN_CTX_start(ctx);
+ x = BN_CTX_get(ctx);
+ y = BN_CTX_get(ctx);
+
+ priv = EC_KEY_get0_private_key(priv_key);
+ if (priv == NULL) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ECDH_R_NO_PRIVATE_VALUE);
+ goto err;
+ }
+
+ group = EC_KEY_get0_group(priv_key);
+
+ tmp = EC_POINT_new(group);
+ if (tmp == NULL) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (!EC_POINT_mul(group, tmp, NULL, pub_key, priv, ctx)) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ECDH_R_POINT_ARITHMETIC_FAILURE);
+ goto err;
+ }
+
+ if (!EC_POINT_get_affine_coordinates_GFp(group, tmp, x, y, ctx)) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ECDH_R_POINT_ARITHMETIC_FAILURE);
+ goto err;
+ }
+
+ buflen = (EC_GROUP_get_degree(group) + 7) / 8;
+ len = BN_num_bytes(x);
+ if (len > buflen) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ buf = OPENSSL_malloc(buflen);
+ if (buf == NULL) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ memset(buf, 0, buflen - len);
+ if (len != (size_t)BN_bn2bin(x, buf + buflen - len)) {
+ OPENSSL_PUT_ERROR(ECDH, ECDH_compute_key, ERR_R_BN_LIB);
+ goto err;
+ }
+
+ if (KDF != 0) {
+ if (KDF(buf, buflen, out, &outlen) == NULL) {
+ OPENSSL_PUT_ERROR(ECDH, 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;
+}
+
+/* Key derivation function from X9.62/SECG */
+/* Way more than we will ever need */
+#define ECDH_KDF_MAX (1 << 30)
+
+int ECDH_KDF_X9_62(uint8_t *out, size_t outlen, const uint8_t *Z,
+ size_t Zlen, const uint8_t *sinfo, size_t sinfolen,
+ const EVP_MD *md) {
+ EVP_MD_CTX mctx;
+ int rv = 0;
+ unsigned int i;
+ size_t mdlen;
+ uint8_t ctr[4];
+
+ if (sinfolen > ECDH_KDF_MAX || outlen > ECDH_KDF_MAX || Zlen > ECDH_KDF_MAX) {
+ return 0;
+ }
+ mdlen = EVP_MD_size(md);
+ EVP_MD_CTX_init(&mctx);
+
+ for (i = 1;; i++) {
+ uint8_t mtmp[EVP_MAX_MD_SIZE];
+ EVP_DigestInit_ex(&mctx, md, NULL);
+ ctr[3] = i & 0xFF;
+ ctr[2] = (i >> 8) & 0xFF;
+ ctr[1] = (i >> 16) & 0xFF;
+ ctr[0] = (i >> 24) & 0xFF;
+ if (!EVP_DigestUpdate(&mctx, Z, Zlen) ||
+ !EVP_DigestUpdate(&mctx, ctr, sizeof(ctr)) ||
+ !EVP_DigestUpdate(&mctx, sinfo, sinfolen)) {
+ goto err;
+ }
+
+ if (outlen >= mdlen) {
+ if (!EVP_DigestFinal(&mctx, out, NULL)) {
+ goto err;
+ }
+ outlen -= mdlen;
+ if (outlen == 0) {
+ break;
+ }
+ out += mdlen;
+ } else {
+ if (!EVP_DigestFinal(&mctx, mtmp, NULL)) {
+ goto err;
+ }
+ memcpy(out, mtmp, outlen);
+ OPENSSL_cleanse(mtmp, mdlen);
+ break;
+ }
+ }
+ rv = 1;
+
+err:
+ EVP_MD_CTX_cleanup(&mctx);
+ return rv;
+}
