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1/*
2 * RSA key extract helper
3 *
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 */
13#include <linux/kernel.h>
14#include <linux/export.h>
15#include <linux/err.h>
16#include <linux/fips.h>
17#include <crypto/internal/rsa.h>
18#include "rsapubkey-asn1.h"
19#include "rsaprivkey-asn1.h"
20
21int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
22 const void *value, size_t vlen)
23{
24 struct rsa_key *key = context;
25
26 key->n = mpi_read_raw_data(value, vlen);
27
28 if (!key->n)
29 return -ENOMEM;
30
31 /* In FIPS mode only allow key size 2K & 3K */
32 if (fips_enabled && (mpi_get_size(key->n) != 256 &&
33 mpi_get_size(key->n) != 384)) {
34 pr_err("RSA: key size not allowed in FIPS mode\n");
35 mpi_free(key->n);
36 key->n = NULL;
37 return -EINVAL;
38 }
39 return 0;
40}
41
42int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
43 const void *value, size_t vlen)
44{
45 struct rsa_key *key = context;
46
47 key->e = mpi_read_raw_data(value, vlen);
48
49 if (!key->e)
50 return -ENOMEM;
51
52 return 0;
53}
54
55int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
56 const void *value, size_t vlen)
57{
58 struct rsa_key *key = context;
59
60 key->d = mpi_read_raw_data(value, vlen);
61
62 if (!key->d)
63 return -ENOMEM;
64
65 /* In FIPS mode only allow key size 2K & 3K */
66 if (fips_enabled && (mpi_get_size(key->d) != 256 &&
67 mpi_get_size(key->d) != 384)) {
68 pr_err("RSA: key size not allowed in FIPS mode\n");
69 mpi_free(key->d);
70 key->d = NULL;
71 return -EINVAL;
72 }
73 return 0;
74}
75
76static void free_mpis(struct rsa_key *key)
77{
78 mpi_free(key->n);
79 mpi_free(key->e);
80 mpi_free(key->d);
81 key->n = NULL;
82 key->e = NULL;
83 key->d = NULL;
84}
85
86/**
87 * rsa_free_key() - frees rsa key allocated by rsa_parse_key()
88 *
89 * @rsa_key: struct rsa_key key representation
90 */
91void rsa_free_key(struct rsa_key *key)
92{
93 free_mpis(key);
94}
95EXPORT_SYMBOL_GPL(rsa_free_key);
96
97/**
98 * rsa_parse_pub_key() - extracts an rsa public key from BER encoded buffer
99 * and stores it in the provided struct rsa_key
100 *
101 * @rsa_key: struct rsa_key key representation
102 * @key: key in BER format
103 * @key_len: length of key
104 *
105 * Return: 0 on success or error code in case of error
106 */
107int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
108 unsigned int key_len)
109{
110 int ret;
111
112 free_mpis(rsa_key);
113 ret = asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
114 if (ret < 0)
115 goto error;
116
117 return 0;
118error:
119 free_mpis(rsa_key);
120 return ret;
121}
122EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
123
124/**
125 * rsa_parse_pub_key() - extracts an rsa private key from BER encoded buffer
126 * and stores it in the provided struct rsa_key
127 *
128 * @rsa_key: struct rsa_key key representation
129 * @key: key in BER format
130 * @key_len: length of key
131 *
132 * Return: 0 on success or error code in case of error
133 */
134int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
135 unsigned int key_len)
136{
137 int ret;
138
139 free_mpis(rsa_key);
140 ret = asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
141 if (ret < 0)
142 goto error;
143
144 return 0;
145error:
146 free_mpis(rsa_key);
147 return ret;
148}
149EXPORT_SYMBOL_GPL(rsa_parse_priv_key);
1/*
2 * RSA key extract helper
3 *
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 */
13#include <linux/kernel.h>
14#include <linux/export.h>
15#include <linux/err.h>
16#include <linux/fips.h>
17#include <crypto/internal/rsa.h>
18#include "rsapubkey.asn1.h"
19#include "rsaprivkey.asn1.h"
20
21int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
22 const void *value, size_t vlen)
23{
24 struct rsa_key *key = context;
25 const u8 *ptr = value;
26 size_t n_sz = vlen;
27
28 /* invalid key provided */
29 if (!value || !vlen)
30 return -EINVAL;
31
32 if (fips_enabled) {
33 while (n_sz && !*ptr) {
34 ptr++;
35 n_sz--;
36 }
37
38 /* In FIPS mode only allow key size 2K and higher */
39 if (n_sz < 256) {
40 pr_err("RSA: key size not allowed in FIPS mode\n");
41 return -EINVAL;
42 }
43 }
44
45 key->n = value;
46 key->n_sz = vlen;
47
48 return 0;
49}
50
51int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
52 const void *value, size_t vlen)
53{
54 struct rsa_key *key = context;
55
56 /* invalid key provided */
57 if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
58 return -EINVAL;
59
60 key->e = value;
61 key->e_sz = vlen;
62
63 return 0;
64}
65
66int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
67 const void *value, size_t vlen)
68{
69 struct rsa_key *key = context;
70
71 /* invalid key provided */
72 if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
73 return -EINVAL;
74
75 key->d = value;
76 key->d_sz = vlen;
77
78 return 0;
79}
80
81int rsa_get_p(void *context, size_t hdrlen, unsigned char tag,
82 const void *value, size_t vlen)
83{
84 struct rsa_key *key = context;
85
86 /* invalid key provided */
87 if (!value || !vlen || vlen > key->n_sz)
88 return -EINVAL;
89
90 key->p = value;
91 key->p_sz = vlen;
92
93 return 0;
94}
95
96int rsa_get_q(void *context, size_t hdrlen, unsigned char tag,
97 const void *value, size_t vlen)
98{
99 struct rsa_key *key = context;
100
101 /* invalid key provided */
102 if (!value || !vlen || vlen > key->n_sz)
103 return -EINVAL;
104
105 key->q = value;
106 key->q_sz = vlen;
107
108 return 0;
109}
110
111int rsa_get_dp(void *context, size_t hdrlen, unsigned char tag,
112 const void *value, size_t vlen)
113{
114 struct rsa_key *key = context;
115
116 /* invalid key provided */
117 if (!value || !vlen || vlen > key->n_sz)
118 return -EINVAL;
119
120 key->dp = value;
121 key->dp_sz = vlen;
122
123 return 0;
124}
125
126int rsa_get_dq(void *context, size_t hdrlen, unsigned char tag,
127 const void *value, size_t vlen)
128{
129 struct rsa_key *key = context;
130
131 /* invalid key provided */
132 if (!value || !vlen || vlen > key->n_sz)
133 return -EINVAL;
134
135 key->dq = value;
136 key->dq_sz = vlen;
137
138 return 0;
139}
140
141int rsa_get_qinv(void *context, size_t hdrlen, unsigned char tag,
142 const void *value, size_t vlen)
143{
144 struct rsa_key *key = context;
145
146 /* invalid key provided */
147 if (!value || !vlen || vlen > key->n_sz)
148 return -EINVAL;
149
150 key->qinv = value;
151 key->qinv_sz = vlen;
152
153 return 0;
154}
155
156/**
157 * rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the
158 * provided struct rsa_key, pointers to the raw key as is,
159 * so that the caller can copy it or MPI parse it, etc.
160 *
161 * @rsa_key: struct rsa_key key representation
162 * @key: key in BER format
163 * @key_len: length of key
164 *
165 * Return: 0 on success or error code in case of error
166 */
167int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
168 unsigned int key_len)
169{
170 return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
171}
172EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
173
174/**
175 * rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the
176 * provided struct rsa_key, pointers to the raw key
177 * as is, so that the caller can copy it or MPI parse it,
178 * etc.
179 *
180 * @rsa_key: struct rsa_key key representation
181 * @key: key in BER format
182 * @key_len: length of key
183 *
184 * Return: 0 on success or error code in case of error
185 */
186int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
187 unsigned int key_len)
188{
189 return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
190}
191EXPORT_SYMBOL_GPL(rsa_parse_priv_key);