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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* RSA internal helpers
*
* Copyright (c) 2015, Intel Corporation
* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
*/
#ifndef _RSA_HELPER_
#define _RSA_HELPER_
#include <linux/types.h>
#include <crypto/akcipher.h>
/**
* rsa_key - RSA key structure
* @n : RSA modulus raw byte stream
* @e : RSA public exponent raw byte stream
* @d : RSA private exponent raw byte stream
* @p : RSA prime factor p of n raw byte stream
* @q : RSA prime factor q of n raw byte stream
* @dp : RSA exponent d mod (p - 1) raw byte stream
* @dq : RSA exponent d mod (q - 1) raw byte stream
* @qinv : RSA CRT coefficient q^(-1) mod p raw byte stream
* @n_sz : length in bytes of RSA modulus n
* @e_sz : length in bytes of RSA public exponent
* @d_sz : length in bytes of RSA private exponent
* @p_sz : length in bytes of p field
* @q_sz : length in bytes of q field
* @dp_sz : length in bytes of dp field
* @dq_sz : length in bytes of dq field
* @qinv_sz : length in bytes of qinv field
*/
struct rsa_key {
const u8 *n;
const u8 *e;
const u8 *d;
const u8 *p;
const u8 *q;
const u8 *dp;
const u8 *dq;
const u8 *qinv;
size_t n_sz;
size_t e_sz;
size_t d_sz;
size_t p_sz;
size_t q_sz;
size_t dp_sz;
size_t dq_sz;
size_t qinv_sz;
};
int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
unsigned int key_len);
int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
unsigned int key_len);
#define RSA_PUB (true)
#define RSA_PRIV (false)
static inline int rsa_set_key(struct crypto_akcipher *child,
unsigned int *key_size, bool is_pubkey,
const void *key, unsigned int keylen)
{
int err;
*key_size = 0;
if (is_pubkey)
err = crypto_akcipher_set_pub_key(child, key, keylen);
else
err = crypto_akcipher_set_priv_key(child, key, keylen);
if (err)
return err;
/* Find out new modulus size from rsa implementation */
err = crypto_akcipher_maxsize(child);
if (err > PAGE_SIZE)
return -ENOTSUPP;
*key_size = err;
return 0;
}
extern struct crypto_template rsa_pkcs1pad_tmpl;
extern struct crypto_template rsassa_pkcs1_tmpl;
#endif
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