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lib: Add support for ECDSA image signing
mkimage supports rsa2048, and rsa4096 signatures. With newer silicon now supporting hardware-accelerated ECDSA, it makes sense to expand signing support to elliptic curves. Implement host-side ECDSA signing and verification with libcrypto. Device-side implementation of signature verification is beyond the scope of this patch. Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
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/* SPDX-License-Identifier: GPL-2.0+ */ | ||
/* | ||
* Copyright (c) 2020, Alexandru Gagniuc <mr.nuke.me@gmail.com>. | ||
*/ | ||
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#ifndef _ECDSA_H | ||
#define _ECDSA_H | ||
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#include <errno.h> | ||
#include <image.h> | ||
#include <linux/kconfig.h> | ||
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/** | ||
* crypto_algo API impementation for ECDSA; | ||
* @see "struct crypto_algo" | ||
* @{ | ||
*/ | ||
#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 ecdsa_sign(struct image_sign_info *info, const struct image_region region[], | ||
int region_count, uint8_t **sigp, uint *sig_len); | ||
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/** | ||
* 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: 0, on success, -ENOSPC if the keydest FDT blob ran out of space, | ||
* other -ve value on error | ||
*/ | ||
int ecdsa_add_verify_data(struct image_sign_info *info, void *keydest); | ||
#else | ||
static inline | ||
int ecdsa_sign(struct image_sign_info *info, const struct image_region region[], | ||
int region_count, uint8_t **sigp, uint *sig_len) | ||
{ | ||
return -ENXIO; | ||
} | ||
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static inline | ||
int ecdsa_add_verify_data(struct image_sign_info *info, void *keydest) | ||
{ | ||
return -ENXIO; | ||
} | ||
#endif | ||
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#if IMAGE_ENABLE_VERIFY_ECDSA | ||
/** | ||
* 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); | ||
#else | ||
static inline | ||
int ecdsa_verify(struct image_sign_info *info, | ||
const struct image_region region[], int region_count, | ||
uint8_t *sig, uint sig_len) | ||
{ | ||
return -ENXIO; | ||
} | ||
#endif | ||
/** @} */ | ||
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#define ECDSA256_BYTES (256 / 8) | ||
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#endif |
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