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Linux/crypto/rsa_helper.c

  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 
 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 (!*ptr && n_sz) {
 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 
 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 
 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 
 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 
 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 
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 
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 
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  */
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  */
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 

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