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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2020, Alexandru Gagniuc <mr.nuke.me@gmail.com>.
*/
#ifndef _ECDSA_H
#define _ECDSA_H
#include <errno.h>
#include <image.h>
#include <linux/kconfig.h>
/**
* crypto_algo API impementation for ECDSA;
* @see "struct crypto_algo"
* @{
*/
/**
* 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 ecdsa_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. I just copypasted this from rsa.h.
*
* @info: Specifies key and FIT information
* @keydest: Destination FDT blob for public key data
* @return: node offset within the FDT blob where the data was written on
* success, -ENOSPC if the keydest FDT blob ran out of space, other -ve
* value on other error
*/
int ecdsa_add_verify_data(struct image_sign_info *info, void *keydest);
/**
* verify() - Verify a signature against some data
*
* @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 ecdsa_verify(struct image_sign_info *info,
const struct image_region region[], int region_count,
uint8_t *sig, uint sig_len);
/** @} */
#define ECDSA256_BYTES (256 / 8)
#endif
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