1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * RSA internal helpers
4 *
5 * Copyright (c) 2015, Intel Corporation
6 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
7 */
8#ifndef _RSA_HELPER_
9#define _RSA_HELPER_
10#include <linux/types.h>
11#include <crypto/akcipher.h>
12
13/**
14 * rsa_key - RSA key structure
15 * @n : RSA modulus raw byte stream
16 * @e : RSA public exponent raw byte stream
17 * @d : RSA private exponent raw byte stream
18 * @p : RSA prime factor p of n raw byte stream
19 * @q : RSA prime factor q of n raw byte stream
20 * @dp : RSA exponent d mod (p - 1) raw byte stream
21 * @dq : RSA exponent d mod (q - 1) raw byte stream
22 * @qinv : RSA CRT coefficient q^(-1) mod p raw byte stream
23 * @n_sz : length in bytes of RSA modulus n
24 * @e_sz : length in bytes of RSA public exponent
25 * @d_sz : length in bytes of RSA private exponent
26 * @p_sz : length in bytes of p field
27 * @q_sz : length in bytes of q field
28 * @dp_sz : length in bytes of dp field
29 * @dq_sz : length in bytes of dq field
30 * @qinv_sz : length in bytes of qinv field
31 */
32struct rsa_key {
33 const u8 *n;
34 const u8 *e;
35 const u8 *d;
36 const u8 *p;
37 const u8 *q;
38 const u8 *dp;
39 const u8 *dq;
40 const u8 *qinv;
41 size_t n_sz;
42 size_t e_sz;
43 size_t d_sz;
44 size_t p_sz;
45 size_t q_sz;
46 size_t dp_sz;
47 size_t dq_sz;
48 size_t qinv_sz;
49};
50
51int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
52 unsigned int key_len);
53
54int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
55 unsigned int key_len);
56
57#define RSA_PUB (true)
58#define RSA_PRIV (false)
59
60static inline int rsa_set_key(struct crypto_akcipher *child,
61 unsigned int *key_size, bool is_pubkey,
62 const void *key, unsigned int keylen)
63{
64 int err;
65
66 *key_size = 0;
67
68 if (is_pubkey)
69 err = crypto_akcipher_set_pub_key(tfm: child, key, keylen);
70 else
71 err = crypto_akcipher_set_priv_key(tfm: child, key, keylen);
72 if (err)
73 return err;
74
75 /* Find out new modulus size from rsa implementation */
76 err = crypto_akcipher_maxsize(tfm: child);
77 if (err > PAGE_SIZE)
78 return -ENOTSUPP;
79
80 *key_size = err;
81 return 0;
82}
83
84extern struct crypto_template rsa_pkcs1pad_tmpl;
85extern struct crypto_template rsassa_pkcs1_tmpl;
86#endif
87

source code of linux/include/crypto/internal/rsa.h