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/* Copyright (c) 2014 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_2RSA_H_
#define VBOOT_REFERENCE_2RSA_H_
#include "2crypto.h"
#include "2return_codes.h"
#include "2struct.h"
struct vb2_workbuf;
/* Public key structure in RAM */
struct vb2_public_key {
uint32_t arrsize; /* Length of n[] and rr[] in number of uint32_t */
uint32_t n0inv; /* -1 / n[0] mod 2^32 */
const uint32_t *n; /* Modulus as little endian array */
const uint32_t *rr; /* R^2 as little endian array */
enum vb2_signature_algorithm sig_alg; /* Signature algorithm */
enum vb2_hash_algorithm hash_alg; /* Hash algorithm */
const char *desc; /* Description */
uint32_t version; /* Key version */
const struct vb2_id *id; /* Key ID */
};
/**
* Convert vb2_crypto_algorithm to vb2_signature_algorithm.
*
* @param algorithm Crypto algorithm (vb2_crypto_algorithm)
*
* @return The signature algorithm for that crypto algorithm, or
* VB2_SIG_INVALID if the crypto algorithm or its corresponding signature
* algorithm is invalid or not supported.
*/
enum vb2_signature_algorithm vb2_crypto_to_signature(uint32_t algorithm);
/**
* Return the size of a RSA signature
*
* @param sig_alg Signature algorithm
* @return The size of the signature in bytes, or 0 if error.
*/
uint32_t vb2_rsa_sig_size(enum vb2_signature_algorithm sig_alg);
/**
* Return the size of a pre-processed RSA public key.
*
* @param sig_alg Signature algorithm
* @return The size of the preprocessed key in bytes, or 0 if error.
*/
uint32_t vb2_packed_key_size(enum vb2_signature_algorithm sig_alg);
/* Size of work buffer sufficient for vb2_rsa_verify_digest() worst case */
#define VB2_VERIFY_RSA_DIGEST_WORKBUF_BYTES (3 * 1024)
/**
* Verify a RSA PKCS1.5 signature against an expected hash digest.
*
* @param key Key to use in signature verification
* @param sig Signature to verify (destroyed in process)
* @param digest Digest of signed data
* @param wb Work buffer
* @return VB2_SUCCESS, or non-zero if error.
*/
vb2_error_t vb2_rsa_verify_digest(const struct vb2_public_key *key,
uint8_t *sig, const uint8_t *digest,
const struct vb2_workbuf *wb);
#endif /* VBOOT_REFERENCE_2RSA_H_ */
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