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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.
*
* Host-side functions for verified boot.
*/
#ifndef VBOOT_REFERENCE_HOST_SIGNATURE_H_
#define VBOOT_REFERENCE_HOST_SIGNATURE_H_
#include "host_key.h"
#include "utility.h"
#include "vboot_struct.h"
struct vb2_private_key;
struct vb2_signature;
/**
* Initialize a signature struct.
*
* @param sig Structure to initialize
* @param sig_data Pointer to signature data buffer (after sig)
* @param sig_size Size of signature data buffer in bytes
* @param data_size Amount of data signed in bytes
*/
void vb2_init_signature(struct vb2_signature *sig, uint8_t *sig_data,
uint32_t sig_size, uint32_t data_size);
/**
* Allocate a new signature.
*
* @param sig_size Size of signature in bytes
* @param data_size Amount of data signed in bytes
*
* @return The signature or NULL if error. Caller must free() it.
*/
struct vb2_signature *vb2_alloc_signature(uint32_t sig_size,
uint32_t data_size);
/**
* Copy a signature.
*
* @param dest Destination signature
* @param src Source signature
*
* @return VB2_SUCCESS, or non-zero if error. */
int vb2_copy_signature(struct vb2_signature *dest,
const struct vb2_signature *src);
/**
* Calculate a SHA-512 digest-only signature.
*
* @param data Pointer to data to hash
* @param size Length of data in bytes
*
* @return The signature, or NULL if error. Caller must free() it.
*/
struct vb2_signature *vb2_sha512_signature(const uint8_t *data, uint32_t size);
/**
* Calculate a signature for the data using the specified key.
*
* @param data Pointer to data to sign
* @param size Length of data in bytes
* @param key Private key to use to sign data
*
* @return The signature, or NULL if error. Caller must free() it.
*/
struct vb2_signature *vb2_calculate_signature(
const uint8_t *data, uint32_t size,
const struct vb2_private_key *key);
/**
* Calculate a signature for the data using an external signer.
*
* @param data Pointer to data to sign
* @param size Length of data in bytes
* @param key_file Name of file containing private key
* @param key_algorithm Key algorithm
* @param external_signer Path to external signer program
*
* @return The signature, or NULL if error. Caller must free() it.
*/
struct vb2_signature *vb2_external_signature(const uint8_t *data,
uint32_t size,
const char *key_file,
uint32_t key_algorithm,
const char *external_signer);
#endif /* VBOOT_REFERENCE_HOST_SIGNATURE_H_ */
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