--- /dev/null
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 1999.
+ */
+/* ====================================================================
+ * Copyright (c) 1999 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/evp.h>
+
+#include <string.h>
+
+#include <openssl/hmac.h>
+
+#include "../internal.h"
+
+
+int PKCS5_PBKDF2_HMAC(const char *password, size_t password_len,
+ const uint8_t *salt, size_t salt_len, unsigned iterations,
+ const EVP_MD *digest, size_t key_len, uint8_t *out_key) {
+ // See RFC 8018, section 5.2.
+ int ret = 0;
+ size_t md_len = EVP_MD_size(digest);
+ uint32_t i = 1;
+ HMAC_CTX hctx;
+ HMAC_CTX_init(&hctx);
+
+ if (!HMAC_Init_ex(&hctx, password, password_len, digest, NULL)) {
+ goto err;
+ }
+
+ while (key_len > 0) {
+ size_t todo = md_len;
+ if (todo > key_len) {
+ todo = key_len;
+ }
+
+ uint8_t i_buf[4];
+ i_buf[0] = (uint8_t)((i >> 24) & 0xff);
+ i_buf[1] = (uint8_t)((i >> 16) & 0xff);
+ i_buf[2] = (uint8_t)((i >> 8) & 0xff);
+ i_buf[3] = (uint8_t)(i & 0xff);
+
+ // Compute U_1.
+ uint8_t digest_tmp[EVP_MAX_MD_SIZE];
+ if (!HMAC_Init_ex(&hctx, NULL, 0, NULL, NULL) ||
+ !HMAC_Update(&hctx, salt, salt_len) ||
+ !HMAC_Update(&hctx, i_buf, 4) ||
+ !HMAC_Final(&hctx, digest_tmp, NULL)) {
+ goto err;
+ }
+
+ OPENSSL_memcpy(out_key, digest_tmp, todo);
+ for (unsigned j = 1; j < iterations; j++) {
+ // Compute the remaining U_* values and XOR.
+ if (!HMAC_Init_ex(&hctx, NULL, 0, NULL, NULL) ||
+ !HMAC_Update(&hctx, digest_tmp, md_len) ||
+ !HMAC_Final(&hctx, digest_tmp, NULL)) {
+ goto err;
+ }
+ for (size_t k = 0; k < todo; k++) {
+ out_key[k] ^= digest_tmp[k];
+ }
+ }
+
+ key_len -= todo;
+ out_key += todo;
+ i++;
+ }
+
+ // RFC 8018 describes iterations (c) as being a "positive integer", so a
+ // value of 0 is an error.
+ //
+ // Unfortunately not all consumers of PKCS5_PBKDF2_HMAC() check their return
+ // value, expecting it to succeed and unconditionally using |out_key|. As a
+ // precaution for such callsites in external code, the old behavior of
+ // iterations < 1 being treated as iterations == 1 is preserved, but
+ // additionally an error result is returned.
+ //
+ // TODO(eroman): Figure out how to remove this compatibility hack, or change
+ // the default to something more sensible like 2048.
+ if (iterations == 0) {
+ goto err;
+ }
+
+ ret = 1;
+
+err:
+ HMAC_CTX_cleanup(&hctx);
+ return ret;
+}
+
+int PKCS5_PBKDF2_HMAC_SHA1(const char *password, size_t password_len,
+ const uint8_t *salt, size_t salt_len,
+ unsigned iterations, size_t key_len,
+ uint8_t *out_key) {
+ return PKCS5_PBKDF2_HMAC(password, password_len, salt, salt_len, iterations,
+ EVP_sha1(), key_len, out_key);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff