/* 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_grpc/cipher.h> #include <assert.h> #include <openssl_grpc/digest.h> #include <openssl_grpc/mem.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)) { goto err; } 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; }