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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/crypto/internal/rsa.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * RSA internal helpers

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 *

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 * Copyright (c) 2015, Intel Corporation

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 * Authors: Tadeusz Struk <[email protected]>

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 */

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#ifndef _RSA_HELPER_

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#define _RSA_HELPER_

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#include <linux/types.h>

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#include <crypto/akcipher.h>

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/**

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 * rsa_key - RSA key structure

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 * @n           : RSA modulus raw byte stream

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 * @e           : RSA public exponent raw byte stream

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 * @d           : RSA private exponent raw byte stream

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 * @p           : RSA prime factor p of n raw byte stream

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 * @q           : RSA prime factor q of n raw byte stream

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 * @dp          : RSA exponent d mod (p - 1) raw byte stream

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 * @dq          : RSA exponent d mod (q - 1) raw byte stream

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 * @qinv        : RSA CRT coefficient q^(-1) mod p raw byte stream

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 * @n_sz        : length in bytes of RSA modulus n

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 * @e_sz        : length in bytes of RSA public exponent

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 * @d_sz        : length in bytes of RSA private exponent

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 * @p_sz        : length in bytes of p field

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 * @q_sz        : length in bytes of q field

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 * @dp_sz       : length in bytes of dp field

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 * @dq_sz       : length in bytes of dq field

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 * @qinv_sz     : length in bytes of qinv field

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 */

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struct rsa_key {

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	const u8 *n;

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	const u8 *e;

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	const u8 *d;

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	const u8 *p;

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	const u8 *q;

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	const u8 *dp;

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	const u8 *dq;

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	const u8 *qinv;

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	size_t n_sz;

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	size_t e_sz;

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	size_t d_sz;

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	size_t p_sz;

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	size_t q_sz;

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	size_t dp_sz;

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	size_t dq_sz;

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	size_t qinv_sz;

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};

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int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,

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		      unsigned int key_len);

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int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,

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		       unsigned int key_len);

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#define RSA_PUB (true)

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#define RSA_PRIV (false)

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static inline int rsa_set_key(struct crypto_akcipher *child,

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			      unsigned int *key_size, bool is_pubkey,

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			      const void *key, unsigned int keylen)

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{

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	int err;

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	*key_size = 0;

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	if (is_pubkey)

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		err = crypto_akcipher_set_pub_key(child, key, keylen);

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	else

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		err = crypto_akcipher_set_priv_key(child, key, keylen);

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	if (err)

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		return err;

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	/* Find out new modulus size from rsa implementation */

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	err = crypto_akcipher_maxsize(child);

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	if (err > PAGE_SIZE)

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		return -ENOTSUPP;

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	*key_size = err;

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	return 0;

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}

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extern struct crypto_template rsa_pkcs1pad_tmpl;

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extern struct crypto_template rsassa_pkcs1_tmpl;

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#endif

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