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80 lines
2.0 KiB
80 lines
2.0 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <openssl/evp.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/**
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* Simple program to generate a key based on PBKDF2 with preset inputs.
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*
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* Will print out the salt and key in hex.
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*/
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#define SALT_LEN 8
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#define ROUNDS 1024
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#define KEY_BITS 128
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int main(int argc, char* argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <password>\n", argv[0]);
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exit(1);
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}
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int fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Could not open /dev/urandom: %s\n", strerror(errno));
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close(fd);
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exit(1);
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}
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unsigned char salt[SALT_LEN];
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if (read(fd, &salt, SALT_LEN) != SALT_LEN) {
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fprintf(stderr, "Could not read salt from /dev/urandom: %s\n", strerror(errno));
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close(fd);
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exit(1);
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}
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close(fd);
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unsigned char rawKey[KEY_BITS];
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if (PKCS5_PBKDF2_HMAC_SHA1(argv[1], strlen(argv[1]), salt, SALT_LEN,
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ROUNDS, KEY_BITS, rawKey) != 1) {
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fprintf(stderr, "Could not generate PBKDF2 output: %s\n", strerror(errno));
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exit(1);
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}
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printf("salt=");
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for (int i = 0; i < SALT_LEN; i++) {
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printf("%02x", salt[i]);
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}
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printf("\n");
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printf("key=");
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for (int i = 0; i < (KEY_BITS / 8); i++) {
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printf("%02x", rawKey[i]);
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}
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printf("\n");
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}
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