RSA signature verification and SHA-1/256/512 reference implementation for verified boot.

src/platform/vboot_reference/include/rsa.h

+/* 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.
+ */
+
+#ifndef VBOOT_REFERENCE_RSA_H_
+#define VBOOT_REFERENCE_RSA_H_
+
+#include <inttypes.h>
+
+#define RSA1024NUMBYTES 128  /* 1024 bit key length */
+#define RSA2048NUMBYTES 256  /* 2048 bit key length */
+#define RSA4096NUMBYTES 512  /* 4096 bit key length */
+#define RSA8192NUMBYTES 1024  /* 8192 bit key length */
+
+#define RSA1024NUMWORDS (RSA1024NUMBYTES / sizeof(uint32_t))
+#define RSA2048NUMWORDS (RSA2048NUMBYTES / sizeof(uint32_t))
+#define RSA4096NUMWORDS (RSA4096NUMBYTES / sizeof(uint32_t))
+#define RSA8192NUMWORDS (RSA8192NUMBYTES / sizeof(uint32_t))
+
+typedef struct RSAPublicKey {
+  int len;  /* Length of n[] in number of uint32_t */
+  uint32_t n0inv;  /* -1 / n[0] mod 2^32 */
+  uint32_t* n;  /* modulus as little endian array */
+  uint32_t* rr; /* R^2 as little endian array */
+} RSAPublicKey;
+
+/* Verify a RSA PKCS1.5 signature [sig] of [sig_type] and length [sig_len]
+ * against an expected [hash] using [key]. Returns 0 on failure, 1 on success.
+ */
+int RSA_verify(const RSAPublicKey *key,
+               const uint8_t* sig,
+               const int sig_len,
+               const uint8_t sig_type,
+               const uint8_t* hash);
+
+#endif  /* VBOOT_REFERENCE_RSA_H_ */