1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2020, Alexandru Gagniuc <mr.nuke.me@gmail.com>.
11 #include <linux/kconfig.h>
14 * crypto_algo API impementation for ECDSA;
15 * @see "struct crypto_algo"
19 * sign() - calculate and return signature for given input data
21 * @info: Specifies key and FIT information
22 * @data: Pointer to the input data
23 * @data_len: Data length
24 * @sigp: Set to an allocated buffer holding the signature
25 * @sig_len: Set to length of the calculated hash
27 * This computes input data signature according to selected algorithm.
28 * Resulting signature value is placed in an allocated buffer, the
29 * pointer is returned as *sigp. The length of the calculated
30 * signature is returned via the sig_len pointer argument. The caller
33 * @return: 0, on success, -ve on error
35 int ecdsa_sign(struct image_sign_info *info, const struct image_region region[],
36 int region_count, uint8_t **sigp, uint *sig_len);
39 * add_verify_data() - Add verification information to FDT
41 * Add public key information to the FDT node, suitable for
42 * verification at run-time. The information added depends on the
43 * algorithm being used. I just copypasted this from rsa.h.
45 * @info: Specifies key and FIT information
46 * @keydest: Destination FDT blob for public key data
47 * @return: 0, on success, -ENOSPC if the keydest FDT blob ran out of space,
48 * other -ve value on error
50 int ecdsa_add_verify_data(struct image_sign_info *info, void *keydest);
53 * verify() - Verify a signature against some data
55 * @info: Specifies key and FIT information
56 * @data: Pointer to the input data
57 * @data_len: Data length
59 * @sig_len: Number of bytes in signature
60 * @return 0 if verified, -ve on error
62 int ecdsa_verify(struct image_sign_info *info,
63 const struct image_region region[], int region_count,
64 uint8_t *sig, uint sig_len);
67 #define ECDSA256_BYTES (256 / 8)