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/* 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.
*
* Some utility functions for use with RSA signature verification.
*/
#ifndef VBOOT_REFERENCE_RSA_UTILITY_H_
#define VBOOT_REFERENCE_RSA_UTILITY_H_
#include "rsa.h"
/* Returns the size of a pre-processed RSA public key in bytes with algorithm
* [algorithm]. */
int RSAProcessedKeySize(int algorithm);
/* Allocate a new RSAPublicKey structure and initialize its pointer fields to
* NULL */
RSAPublicKey* RSAPublicKeyNew(void);
/* Deep free the contents of [key]. */
void RSAPublicKeyFree(RSAPublicKey* key);
/* Create a RSAPublic key structure from binary blob [buf] of length
* [len].
*
* Caller owns the returned key and must free it.
*/
RSAPublicKey* RSAPublicKeyFromBuf(const uint8_t* buf, int len);
/* Perform RSA signature verification on [buf] of length [len] against expected
* signature [sig] using signature algorithm [algorithm]. The public key used
* for verification can either be in the form of a pre-process key blob
* [key_blob] or RSAPublicKey structure [key]. One of [key_blob] or [key] must
* be non-NULL, and the other NULL or the function will fail.
*
* Returns 1 on verification success, 0 on verification failure or invalid
* arguments.
*
* Note: This function is for use in the firmware and assumes all pointers point
* to areas in the memory of the right size.
*
*/
int RSAVerifyBinary_f(const uint8_t* key_blob,
const RSAPublicKey* key,
const uint8_t* buf,
uint64_t len,
const uint8_t* sig,
int algorithm);
/* Version of RSAVerifyBinary_f() where instead of the raw binary blob
* of data, its digest is passed as the argument. */
int RSAVerifyBinaryWithDigest_f(const uint8_t* key_blob,
const RSAPublicKey* key,
const uint8_t* digest,
const uint8_t* sig,
int algorithm);
#endif /* VBOOT_REFERENCE_RSA_UTILITY_H_ */
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