--- /dev/null
+/* ====================================================================
+ * Copyright (c) 1998-2007 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 <assert.h>
+
+#include <openssl/digest.h>
+#include <openssl/hmac.h>
+#include <openssl/mem.h>
+
+#include "internal.h"
+#include "../../internal.h"
+
+
+// tls1_P_hash computes the TLS P_<hash> function as described in RFC 5246,
+// section 5. It XORs |out_len| bytes to |out|, using |md| as the hash and
+// |secret| as the secret. |label|, |seed1|, and |seed2| are concatenated to
+// form the seed parameter. It returns true on success and false on failure.
+static int tls1_P_hash(uint8_t *out, size_t out_len,
+ const EVP_MD *md,
+ const uint8_t *secret, size_t secret_len,
+ const char *label, size_t label_len,
+ const uint8_t *seed1, size_t seed1_len,
+ const uint8_t *seed2, size_t seed2_len) {
+ HMAC_CTX ctx, ctx_tmp, ctx_init;
+ uint8_t A1[EVP_MAX_MD_SIZE];
+ unsigned A1_len;
+ int ret = 0;
+
+ const size_t chunk = EVP_MD_size(md);
+ HMAC_CTX_init(&ctx);
+ HMAC_CTX_init(&ctx_tmp);
+ HMAC_CTX_init(&ctx_init);
+
+ if (!HMAC_Init_ex(&ctx_init, secret, secret_len, md, NULL) ||
+ !HMAC_CTX_copy_ex(&ctx, &ctx_init) ||
+ !HMAC_Update(&ctx, (const uint8_t *) label, label_len) ||
+ !HMAC_Update(&ctx, seed1, seed1_len) ||
+ !HMAC_Update(&ctx, seed2, seed2_len) ||
+ !HMAC_Final(&ctx, A1, &A1_len)) {
+ goto err;
+ }
+
+ for (;;) {
+ unsigned len;
+ uint8_t hmac[EVP_MAX_MD_SIZE];
+ if (!HMAC_CTX_copy_ex(&ctx, &ctx_init) ||
+ !HMAC_Update(&ctx, A1, A1_len) ||
+ // Save a copy of |ctx| to compute the next A1 value below.
+ (out_len > chunk && !HMAC_CTX_copy_ex(&ctx_tmp, &ctx)) ||
+ !HMAC_Update(&ctx, (const uint8_t *) label, label_len) ||
+ !HMAC_Update(&ctx, seed1, seed1_len) ||
+ !HMAC_Update(&ctx, seed2, seed2_len) ||
+ !HMAC_Final(&ctx, hmac, &len)) {
+ goto err;
+ }
+ assert(len == chunk);
+
+ // XOR the result into |out|.
+ if (len > out_len) {
+ len = out_len;
+ }
+ for (unsigned i = 0; i < len; i++) {
+ out[i] ^= hmac[i];
+ }
+ out += len;
+ out_len -= len;
+
+ if (out_len == 0) {
+ break;
+ }
+
+ // Calculate the next A1 value.
+ if (!HMAC_Final(&ctx_tmp, A1, &A1_len)) {
+ goto err;
+ }
+ }
+
+ ret = 1;
+
+err:
+ OPENSSL_cleanse(A1, sizeof(A1));
+ HMAC_CTX_cleanup(&ctx);
+ HMAC_CTX_cleanup(&ctx_tmp);
+ HMAC_CTX_cleanup(&ctx_init);
+ return ret;
+}
+
+int CRYPTO_tls1_prf(const EVP_MD *digest,
+ uint8_t *out, size_t out_len,
+ const uint8_t *secret, size_t secret_len,
+ const char *label, size_t label_len,
+ const uint8_t *seed1, size_t seed1_len,
+ const uint8_t *seed2, size_t seed2_len) {
+ if (out_len == 0) {
+ return 1;
+ }
+
+ OPENSSL_memset(out, 0, out_len);
+
+ if (digest == EVP_md5_sha1()) {
+ // If using the MD5/SHA1 PRF, |secret| is partitioned between MD5 and SHA-1.
+ size_t secret_half = secret_len - (secret_len / 2);
+ if (!tls1_P_hash(out, out_len, EVP_md5(), secret, secret_half, label,
+ label_len, seed1, seed1_len, seed2, seed2_len)) {
+ return 0;
+ }
+
+ // Note that, if |secret_len| is odd, the two halves share a byte.
+ secret += secret_len - secret_half;
+ secret_len = secret_half;
+ digest = EVP_sha1();
+ }
+
+ return tls1_P_hash(out, out_len, digest, secret, secret_len, label, label_len,
+ seed1, seed1_len, seed2, seed2_len);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff