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Unified Diff: src/platform/vboot_reference/tests/signature_digest.c

Issue 552227: Utility to output digests in format suitable for RSA signatures. (Closed)
Patch Set: Nit fixes. Created 10 years, 11 months ago
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Index: src/platform/vboot_reference/tests/signature_digest.c
diff --git a/src/platform/vboot_reference/tests/signature_digest.c b/src/platform/vboot_reference/tests/signature_digest.c
new file mode 100644
index 0000000000000000000000000000000000000000..89d98fe120a415aceb3e72bca1e29c0020044b2d
--- /dev/null
+++ b/src/platform/vboot_reference/tests/signature_digest.c
@@ -0,0 +1,68 @@
+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Utility that outputs the message digest of the contents of a file in a
+ * format that can be used as input to OpenSSL for an RSA signature.
+ * Needed until the stable OpenSSL release supports SHA-256/512 digests for
+ * RSA signatures.
+ * Outputs DigestInfo || Digest where DigestInfo is the OID depending on the
+ * choice of the hash algorithm (see padding.c).
+ *
+ */
+
+#include "signature_digest.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "digest_utility.h"
+#include "padding.h"
+#include "sha.h"
+
+uint8_t* prepend_digestinfo(int algorithm, uint8_t* digest) {
+ const int digest_size = hash_size_map[algorithm];
+ const int digestinfo_size = digestinfo_size_map[algorithm];
+ const uint8_t* digestinfo = hash_digestinfo_map[algorithm];
+ uint8_t* p = malloc(digestinfo_size + digest_size);
+ memcpy(p, digestinfo, digestinfo_size);
+ memcpy(p + digestinfo_size, digest, digest_size);
+ return p;
+}
+
+int main(int argc, char* argv[]) {
+ int i, algorithm;
+ uint8_t* digest = NULL;
+ uint8_t* signature = NULL;
+ uint8_t* info_digest = NULL;
+
+ if (argc != 3) {
+ fprintf(stderr, "Usage: %s <algorithm> <input file>\n\n",
+ argv[0]);
+ fprintf(stderr, "where <algorithm> is the signature algorithm to use:\n");
+ for(i = 0; i<kNumAlgorithms; i++)
+ fprintf(stderr, "\t%d for %s\n", i, algo_strings[i]);
+ return -1;
+ }
+
+ algorithm = atoi(argv[1]);
+ if (algorithm >= kNumAlgorithms) {
+ fprintf(stderr, "Invalid Algorithm!\n");
+ goto failure;
+ }
+
+ if (!(digest = calculate_digest(argv[2], algorithm)))
+ goto failure;
+
+ info_digest = prepend_digestinfo(algorithm, digest);
+ write(1, info_digest, hash_size_map[algorithm] +
+ digestinfo_size_map[algorithm]);
+
+failure:
+ free(digest);
+ free(info_digest);
+ free(signature);
+
+ return 0;
+}
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