87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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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 <tadeusz.struk@intel.com>
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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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