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/*
* Copyright (c) 2013, Google Inc.
*
* (C) Copyright 2008 Semihalf
*
* (C) Copyright 2000-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _RSA_H
#define _RSA_H
#include <errno.h>
#include <image.h>
#if IMAGE_ENABLE_SIGN
/**
* sign() - calculate and return signature for given input data
*
* @info: Specifies key and FIT information
* @data: Pointer to the input data
* @data_len: Data length
* @sigp: Set to an allocated buffer holding the signature
* @sig_len: Set to length of the calculated hash
*
* This computes input data signature according to selected algorithm.
* Resulting signature value is placed in an allocated buffer, the
* pointer is returned as *sigp. The length of the calculated
* signature is returned via the sig_len pointer argument. The caller
* should free *sigp.
*
* @return: 0, on success, -ve on error
*/
int rsa_sign(struct image_sign_info *info,
const struct image_region region[],
int region_count, uint8_t **sigp, uint *sig_len);
/**
* add_verify_data() - Add verification information to FDT
*
* Add public key information to the FDT node, suitable for
* verification at run-time. The information added depends on the
* algorithm being used.
*
* @info: Specifies key and FIT information
* @keydest: Destination FDT blob for public key data
* @return: 0, on success, -ve on error
*/
int rsa_add_verify_data(struct image_sign_info *info, void *keydest);
#else
static inline int rsa_sign(struct image_sign_info *info,
const struct image_region region[], int region_count,
uint8_t **sigp, uint *sig_len)
{
return -ENXIO;
}
static inline int rsa_add_verify_data(struct image_sign_info *info,
void *keydest)
{
return -ENXIO;
}
#endif
#if IMAGE_ENABLE_VERIFY
/**
* rsa_verify() - Verify a signature against some data
*
* Verify a RSA PKCS1.5 signature against an expected hash.
*
* @info: Specifies key and FIT information
* @data: Pointer to the input data
* @data_len: Data length
* @sig: Signature
* @sig_len: Number of bytes in signature
* @return 0 if verified, -ve on error
*/
int rsa_verify(struct image_sign_info *info,
const struct image_region region[], int region_count,
uint8_t *sig, uint sig_len);
#else
static inline int rsa_verify(struct image_sign_info *info,
const struct image_region region[], int region_count,
uint8_t *sig, uint sig_len)
{
return -ENXIO;
}
#endif
#endif
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