95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2020, Alexandru Gagniuc <mr.nuke.me@gmail.com>.
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*/
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#ifndef _ECDSA_H
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#define _ECDSA_H
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#include <errno.h>
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#include <image.h>
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#include <linux/kconfig.h>
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/**
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* crypto_algo API impementation for ECDSA;
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* @see "struct crypto_algo"
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* @{
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*/
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#if IMAGE_ENABLE_SIGN
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/**
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* sign() - calculate and return signature for given input data
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*
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* @info: Specifies key and FIT information
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* @data: Pointer to the input data
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* @data_len: Data length
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* @sigp: Set to an allocated buffer holding the signature
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* @sig_len: Set to length of the calculated hash
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*
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* This computes input data signature according to selected algorithm.
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* Resulting signature value is placed in an allocated buffer, the
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* pointer is returned as *sigp. The length of the calculated
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* signature is returned via the sig_len pointer argument. The caller
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* should free *sigp.
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*
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* @return: 0, on success, -ve on error
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*/
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int ecdsa_sign(struct image_sign_info *info, const struct image_region region[],
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int region_count, uint8_t **sigp, uint *sig_len);
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/**
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* add_verify_data() - Add verification information to FDT
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*
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* Add public key information to the FDT node, suitable for
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* verification at run-time. The information added depends on the
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* algorithm being used. I just copypasted this from rsa.h.
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*
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* @info: Specifies key and FIT information
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* @keydest: Destination FDT blob for public key data
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* @return: 0, on success, -ENOSPC if the keydest FDT blob ran out of space,
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* other -ve value on error
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*/
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int ecdsa_add_verify_data(struct image_sign_info *info, void *keydest);
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#else
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static inline
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int ecdsa_sign(struct image_sign_info *info, const struct image_region region[],
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int region_count, uint8_t **sigp, uint *sig_len)
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{
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return -ENXIO;
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}
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static inline
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int ecdsa_add_verify_data(struct image_sign_info *info, void *keydest)
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{
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return -ENXIO;
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}
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#endif
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#if IMAGE_ENABLE_VERIFY_ECDSA
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/**
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* verify() - Verify a signature against some data
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*
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* @info: Specifies key and FIT information
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* @data: Pointer to the input data
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* @data_len: Data length
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* @sig: Signature
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* @sig_len: Number of bytes in signature
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* @return 0 if verified, -ve on error
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*/
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int ecdsa_verify(struct image_sign_info *info,
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const struct image_region region[], int region_count,
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uint8_t *sig, uint sig_len);
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#else
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static inline
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int ecdsa_verify(struct image_sign_info *info,
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const struct image_region region[], int region_count,
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uint8_t *sig, uint sig_len)
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{
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return -ENXIO;
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}
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#endif
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/** @} */
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#define ECDSA256_BYTES (256 / 8)
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#endif
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