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https://github.com/Telecominfraproject/OpenCellular.git
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21c3f7fef7
This reverts commit e018a80a37aaa45681f45f5852f04d20aedd8b2d. Review URL: http://codereview.chromium.org/1593002
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "signature_digest.h"
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#define OPENSSL_NO_SHA
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#include <openssl/engine.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "padding.h"
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#include "sha.h"
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#include "sha_utility.h"
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#include "utility.h"
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uint8_t* PrependDigestInfo(int algorithm, uint8_t* digest) {
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const int digest_size = hash_size_map[algorithm];
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const int digestinfo_size = digestinfo_size_map[algorithm];
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const uint8_t* digestinfo = hash_digestinfo_map[algorithm];
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uint8_t* p = Malloc(digestinfo_size + digest_size);
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Memcpy(p, digestinfo, digestinfo_size);
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Memcpy(p + digestinfo_size, digest, digest_size);
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return p;
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}
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uint8_t* SignatureDigest(const uint8_t* buf, uint64_t len, int algorithm) {
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uint8_t* info_digest = NULL;
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uint8_t* digest = NULL;
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if (algorithm >= kNumAlgorithms) {
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fprintf(stderr, "SignatureDigest() called with invalid algorithm!\n");
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} else if ((digest = DigestBuf(buf, len, algorithm))) {
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info_digest = PrependDigestInfo(algorithm, digest);
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}
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Free(digest);
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return info_digest;
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}
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uint8_t* SignatureBuf(const uint8_t* buf, uint64_t len, const char* key_file,
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int algorithm) {
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FILE* key_fp = NULL;
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RSA* key = NULL;
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uint8_t* signature = NULL;
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uint8_t* signature_digest = SignatureDigest(buf, len, algorithm);
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int signature_digest_len = (hash_size_map[algorithm] +
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digestinfo_size_map[algorithm]);
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key_fp = fopen(key_file, "r");
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if (!key_fp) {
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fprintf(stderr, "SignatureBuf(): Couldn't open key file: %s\n", key_file);
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Free(signature_digest);
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return NULL;
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}
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if ((key = PEM_read_RSAPrivateKey(key_fp, NULL, NULL, NULL)))
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signature = (uint8_t*) Malloc(siglen_map[algorithm]);
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else
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fprintf(stderr, "SignatureBuf(): Couldn't read private key from file: %s\n",
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key_file);
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if (signature) {
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if (-1 == RSA_private_encrypt(signature_digest_len, /* Input length. */
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signature_digest, /* Input data. */
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signature, /* Output signature. */
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key, /* Key to use. */
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RSA_PKCS1_PADDING)) /* Padding to use. */
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fprintf(stderr, "SignatureBuf(): RSA_private_encrypt() failed.\n");
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}
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fclose(key_fp);
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if (key)
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RSA_free(key);
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Free(signature_digest);
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return signature;
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}
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