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
rsa_get_n(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)21 int 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
rsa_get_e(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)51 int 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
rsa_get_d(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)66 int 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
rsa_get_p(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)81 int 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
rsa_get_q(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)96 int 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
rsa_get_dp(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)111 int 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
rsa_get_dq(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)126 int 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
rsa_get_qinv(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)141 int 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 */
rsa_parse_pub_key(struct rsa_key * rsa_key,const void * key,unsigned int key_len)167 int 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 }
172 EXPORT_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 */
rsa_parse_priv_key(struct rsa_key * rsa_key,const void * key,unsigned int key_len)186 int 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 }
191 EXPORT_SYMBOL_GPL(rsa_parse_priv_key);
192
