2 * RSA key extract helper
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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)
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"
21 int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
22 const void *value, size_t vlen)
24 struct rsa_key *key = context;
25 const u8 *ptr = value;
28 /* invalid key provided */
33 while (!*ptr && n_sz) {
38 /* In FIPS mode only allow key size 2K & 3K */
39 if (n_sz != 256 && n_sz != 384) {
40 pr_err("RSA: key size not allowed in FIPS mode\n");
51 int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
52 const void *value, size_t vlen)
54 struct rsa_key *key = context;
56 /* invalid key provided */
57 if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
66 int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
67 const void *value, size_t vlen)
69 struct rsa_key *key = context;
71 /* invalid key provided */
72 if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
82 * rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the
83 * provided struct rsa_key, pointers to the raw key as is,
84 * so that the caller can copy it or MPI parse it, etc.
86 * @rsa_key: struct rsa_key key representation
87 * @key: key in BER format
88 * @key_len: length of key
90 * Return: 0 on success or error code in case of error
92 int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
95 return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
97 EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
100 * rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the
101 * provided struct rsa_key, pointers to the raw key
102 * as is, so that the caller can copy it or MPI parse it,
105 * @rsa_key: struct rsa_key key representation
106 * @key: key in BER format
107 * @key_len: length of key
109 * Return: 0 on success or error code in case of error
111 int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
112 unsigned int key_len)
114 return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
116 EXPORT_SYMBOL_GPL(rsa_parse_priv_key);