99 lines
2.0 KiB
C
99 lines
2.0 KiB
C
// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#include <openssl/cipher.h>
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#include <assert.h>
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#include <openssl/digest.h>
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#include <openssl/mem.h>
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#include <openssl/evp.h>
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int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
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const uint8_t *salt, const uint8_t *data, size_t data_len,
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unsigned count, uint8_t *key, uint8_t *iv) {
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EVP_MD_CTX c;
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uint8_t md_buf[EVP_MAX_MD_SIZE];
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unsigned addmd = 0;
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unsigned mds = 0, i;
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int rv = 0;
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unsigned nkey = EVP_CIPHER_key_length(type);
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unsigned niv = EVP_CIPHER_iv_length(type);
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assert(nkey <= EVP_MAX_KEY_LENGTH);
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assert(niv <= EVP_MAX_IV_LENGTH);
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if (data == NULL) {
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return nkey;
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}
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EVP_MD_CTX_init(&c);
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for (;;) {
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if (!EVP_DigestInit_ex(&c, md, NULL)) {
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goto err;
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}
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if (addmd++) {
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if (!EVP_DigestUpdate(&c, md_buf, mds)) {
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goto err;
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}
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}
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if (!EVP_DigestUpdate(&c, data, data_len)) {
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goto err;
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}
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if (salt != NULL) {
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if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN)) {
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goto err;
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}
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}
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if (!EVP_DigestFinal_ex(&c, md_buf, &mds)) {
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goto err;
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}
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for (i = 1; i < count; i++) {
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if (!EVP_DigestInit_ex(&c, md, NULL) ||
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!EVP_DigestUpdate(&c, md_buf, mds) ||
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!EVP_DigestFinal_ex(&c, md_buf, &mds)) {
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goto err;
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}
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}
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i = 0;
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if (nkey) {
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for (;;) {
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if (nkey == 0 || i == mds) {
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break;
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}
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if (key != NULL) {
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*(key++) = md_buf[i];
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}
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nkey--;
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i++;
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}
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}
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if (niv && i != mds) {
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for (;;) {
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if (niv == 0 || i == mds) {
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break;
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}
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if (iv != NULL) {
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*(iv++) = md_buf[i];
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}
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niv--;
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i++;
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}
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}
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if (nkey == 0 && niv == 0) {
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break;
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}
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}
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rv = EVP_CIPHER_key_length(type);
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err:
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EVP_MD_CTX_cleanup(&c);
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OPENSSL_cleanse(md_buf, EVP_MAX_MD_SIZE);
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return rv;
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}
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