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https://github.com/Telecominfraproject/OpenCellular.git
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f5564fa98c
This CL does the following: 1) It adds a SignatureBuf function which uses the OpenSSL library to generate RSA signature. This is more robust than the previous way of invoking the command line "openssl" utility and capturing its output. No more unnecessary temporary files for signature operations. 2) It adds functions that allow direct manipulation of binary verified Firmware and Kernel Image blobs in memory. 3) It changes the structure field members for FirmwareImage to make it consistent with KernelImage. Now it's clearer which key is used when. 4) Minor bug fixes and slightly improved API for dealing verified boot firmware and kernel images. 5) Renames the RSA_verify function to prevent conflicts with OpenSSL since it's linked into the firmware utility binary. Review URL: http://codereview.chromium.org/661353
75 lines
2.5 KiB
C
75 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, int 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, int 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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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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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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