87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
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/*
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* ECC parameters for ECDSA
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*
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* Copyright (c) 2017, NVIDIA Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_ECDSA_
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#define _CRYPTO_ECDSA_
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#include <crypto/ecc.h>
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#include <crypto/akcipher.h>
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/**
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* DOC: ECDSA Helper Functions
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*
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* To use ECDSA as a akcipher, following functions should be used
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* along with ECDSA private/public keys. The keys are mentioned as
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* a packet private-public key and can be set with API functions
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* crypto_akcipher_set_priv_key() & crypto_akcipher_set_pub_key().
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*/
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/**
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* struct ecdsa - define an ECDSA private or public key
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*
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* @curve_id: ECC curve id the keys are based on
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* @key: Private or public ECDSA key. Private key shall be a valid
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* number as per curve's prime. Public key is expressed by
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* valid affine coordinates Qx & Qy.
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* @key_size: Size of ECDSA private/public key
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*/
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struct ecdsa {
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unsigned char curve_id;
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unsigned char key[2 * ECC_MAX_DIGIT_BYTES];
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unsigned short key_size;
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};
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/**
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* crypto_ecdsa_parse_pub_key() - parse and obtain ECDSA public key
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* @buf: Buffer holding ECDDA packet key that should be parsed
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* to get ECDSA public key
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* @len: Length of the packet private-public key buffer
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* @params: Buffer allocated by the caller that is filled with
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* ECDSA public key
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*
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* This routine parses packet key from @buf and obtains version, curve id,
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* private key and public key. It checks for correct version and supported
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* curve id. It copies public key from the public key location in given
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* ECDSA packet key to @params.
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*
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* Return: -EINVAL on errors, 0 on success
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*/
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int crypto_ecdsa_parse_pub_key(const char *buf, unsigned int len,
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struct ecdsa *params);
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/**
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* crypto_ecdsa_parse_priv_key() - parse and obtain ECDSA private key
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* @buf: Buffer holding ECDDA packet key that should be parsed
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* to get ECDSA private key
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* @len: Length of the packet private-public key buffer
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* @params: Buffer allocated by the caller that is filled with
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* ECDSA private key
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*
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* Return: -EINVAL on errors, 0 on success
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*/
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int crypto_ecdsa_parse_priv_key(const char *buf, unsigned int len,
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struct ecdsa *params);
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/**
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* ecdsa_supported_curve() - check supported curve
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* @curve_id: ECC curve id as defined by kernel
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*
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* Return: 0 for un-supported curve, ECC DIGITS for curve on success
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*/
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unsigned int ecdsa_supported_curve(unsigned int curve_id);
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void ecdsa_parse_msg_hash(struct akcipher_request *req, u64 *msg,
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unsigned int ndigits);
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int ecdsa_get_rnd_bytes(u8 *rdata, unsigned int dlen);
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#endif /* _CRYPTO_ECDSA_ */
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