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Define a UCLASS API for verifying ECDSA signatures. Unlike UCLASS_MOD_EXP, which focuses strictly on modular exponentiation, the ECDSA class focuses on verification. This is done so that it better aligns with mach-specific implementations, such as stm32mp. Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
40 lines
1.2 KiB
C
40 lines
1.2 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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#include <dm/device.h>
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/**
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* struct ecdsa_public_key - ECDSA public key properties
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*
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* The struct has pointers to the (x, y) curve coordinates to an ECDSA public
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* key, as well as the name of the ECDSA curve. The size of the key is inferred
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* from the 'curve_name'
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*/
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struct ecdsa_public_key {
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const char *curve_name; /* Name of curve, e.g. "prime256v1" */
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const void *x; /* x coordinate of public key */
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const void *y; /* y coordinate of public key */
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unsigned int size_bits; /* key size in bits, derived from curve name */
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};
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struct ecdsa_ops {
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/**
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* Verify signature of hash against given public key
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*
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* @dev: ECDSA Device
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* @pubkey: ECDSA public key
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* @hash: Hash of binary image
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* @hash_len: Length of hash in bytes
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* @signature: Signature in a raw (R, S) point pair
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* @sig_len: Length of signature in bytes
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*
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* This function verifies that the 'signature' of the given 'hash' was
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* signed by the private key corresponding to 'pubkey'.
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*/
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int (*verify)(struct udevice *dev, const struct ecdsa_public_key *pubkey,
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const void *hash, size_t hash_len,
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const void *signature, size_t sig_len);
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};
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