Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/crypto/cipher/derive_key.c

@@ -0,0 +1,154 @@
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * 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 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 acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS 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 AUTHOR OR 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.] */
+
+#include <openssl/cipher.h>
+
+#include <assert.h>
+
+#include <openssl/digest.h>
+#include <openssl/mem.h>
+
+#include "internal.h"
+
+
+#define PKCS5_SALT_LEN 8
+
+int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
+                   const uint8_t *salt, const uint8_t *data, size_t data_len,
+                   unsigned count, uint8_t *key, uint8_t *iv) {
+  EVP_MD_CTX c;
+  uint8_t md_buf[EVP_MAX_MD_SIZE];
+  unsigned niv, nkey, addmd = 0;
+  unsigned mds = 0, i;
+  int rv = 0;
+
+  nkey = type->key_len;
+  niv = type->iv_len;
+
+  assert(nkey <= EVP_MAX_KEY_LENGTH);
+  assert(niv <= EVP_MAX_IV_LENGTH);
+
+  if (data == NULL) {
+    return nkey;
+  }
+
+  EVP_MD_CTX_init(&c);
+  for (;;) {
+    if (!EVP_DigestInit_ex(&c, md, NULL)) {
+      return 0;
+    }
+    if (addmd++) {
+      if (!EVP_DigestUpdate(&c, md_buf, mds)) {
+        goto err;
+      }
+    }
+    if (!EVP_DigestUpdate(&c, data, data_len)) {
+      goto err;
+    }
+    if (salt != NULL) {
+      if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN)) {
+        goto err;
+      }
+    }
+    if (!EVP_DigestFinal_ex(&c, md_buf, &mds)) {
+      goto err;
+    }
+
+    for (i = 1; i < count; i++) {
+      if (!EVP_DigestInit_ex(&c, md, NULL) ||
+          !EVP_DigestUpdate(&c, md_buf, mds) ||
+          !EVP_DigestFinal_ex(&c, md_buf, &mds)) {
+        goto err;
+      }
+    }
+
+    i = 0;
+    if (nkey) {
+      for (;;) {
+        if (nkey == 0 || i == mds) {
+          break;
+        }
+        if (key != NULL) {
+          *(key++) = md_buf[i];
+        }
+        nkey--;
+        i++;
+      }
+    }
+
+    if (niv && i != mds) {
+      for (;;) {
+        if (niv == 0 || i == mds) {
+          break;
+        }
+        if (iv != NULL) {
+          *(iv++) = md_buf[i];
+        }
+        niv--;
+        i++;
+      }
+    }
+    if (nkey == 0 && niv == 0) {
+      break;
+    }
+  }
+  rv = type->key_len;
+
+err:
+  EVP_MD_CTX_cleanup(&c);
+  OPENSSL_cleanse(md_buf, EVP_MAX_MD_SIZE);
+  return rv;
+}