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