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/*
* Copyright (C) 2013 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.
*/
#define _GNU_SOURCE /* needed for asprintf */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <crypto_utils/android_pubkey.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/sha.h>
static int write_public_keyfile(RSA *private_key, const char *private_key_path)
{
uint8_t key_data[ANDROID_PUBKEY_ENCODED_SIZE];
BIO *bfile = NULL;
char *path = NULL;
int ret = -1;
if (asprintf(&path, "%s.pub", private_key_path) < 0)
goto out;
if (!android_pubkey_encode(private_key, key_data, sizeof(key_data)))
goto out;
bfile = BIO_new_file(path, "w");
if (!bfile)
goto out;
BIO_write(bfile, key_data, sizeof(key_data));
BIO_flush(bfile);
ret = 0;
out:
BIO_free_all(bfile);
free(path);
return ret;
}
static int convert_x509(const char *pem_file, const char *key_file)
{
int ret = -1;
FILE *f = NULL;
EVP_PKEY *pkey = NULL;
RSA *rsa = NULL;
X509 *cert = NULL;
if (!pem_file || !key_file) {
goto out;
}
f = fopen(pem_file, "r");
if (!f) {
printf("Failed to open '%s'\n", pem_file);
goto out;
}
cert = PEM_read_X509(f, &cert, NULL, NULL);
if (!cert) {
printf("Failed to read PEM certificate from file '%s'\n", pem_file);
goto out;
}
pkey = X509_get_pubkey(cert);
if (!pkey) {
printf("Failed to extract public key from certificate '%s'\n", pem_file);
goto out;
}
rsa = EVP_PKEY_get1_RSA(pkey);
if (!rsa) {
printf("Failed to get the RSA public key from '%s'\n", pem_file);
goto out;
}
if (write_public_keyfile(rsa, key_file) < 0) {
printf("Failed to write public key\n");
goto out;
}
ret = 0;
out:
if (f) {
fclose(f);
}
if (cert) {
X509_free(cert);
}
if (pkey) {
EVP_PKEY_free(pkey);
}
if (rsa) {
RSA_free(rsa);
}
return ret;
}
static int generate_key(const char *file)
{
int ret = -1;
FILE *f = NULL;
RSA* rsa = RSA_new();
BIGNUM* exponent = BN_new();
EVP_PKEY* pkey = EVP_PKEY_new();
if (!pkey || !exponent || !rsa) {
printf("Failed to allocate key\n");
goto out;
}
BN_set_word(exponent, RSA_F4);
RSA_generate_key_ex(rsa, 2048, exponent, NULL);
EVP_PKEY_set1_RSA(pkey, rsa);
f = fopen(file, "w");
if (!f) {
printf("Failed to open '%s'\n", file);
goto out;
}
if (!PEM_write_PrivateKey(f, pkey, NULL, NULL, 0, NULL, NULL)) {
printf("Failed to write key\n");
goto out;
}
if (write_public_keyfile(rsa, file) < 0) {
printf("Failed to write public key\n");
goto out;
}
ret = 0;
out:
if (f)
fclose(f);
EVP_PKEY_free(pkey);
RSA_free(rsa);
BN_free(exponent);
return ret;
}
static void usage(){
printf("Usage: generate_verity_key <path-to-key> | -convert <path-to-x509-pem> <path-to-key>\n");
}
int main(int argc, char *argv[]) {
if (argc == 2) {
return generate_key(argv[1]);
} else if (argc == 4 && !strcmp(argv[1], "-convert")) {
return convert_x509(argv[2], argv[3]);
} else {
usage();
exit(-1);
}
}
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