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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - crypto/rsa_helper.c
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
;
26 key
->n
= mpi_read_raw_data(value
, vlen
);
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");
42 int rsa_get_e(void *context
, size_t hdrlen
, unsigned char tag
,
43 const void *value
, size_t vlen
)
45 struct rsa_key
*key
= context
;
47 key
->e
= mpi_read_raw_data(value
, vlen
);
55 int rsa_get_d(void *context
, size_t hdrlen
, unsigned char tag
,
56 const void *value
, size_t vlen
)
58 struct rsa_key
*key
= context
;
60 key
->d
= mpi_read_raw_data(value
, vlen
);
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");
76 static void free_mpis(struct rsa_key
*key
)
87 * rsa_free_key() - frees rsa key allocated by rsa_parse_key()
89 * @rsa_key: struct rsa_key key representation
91 void rsa_free_key(struct rsa_key
*key
)
95 EXPORT_SYMBOL_GPL(rsa_free_key
);
98 * rsa_parse_pub_key() - extracts an rsa public key from BER encoded buffer
99 * and stores it in the provided struct rsa_key
101 * @rsa_key: struct rsa_key key representation
102 * @key: key in BER format
103 * @key_len: length of key
105 * Return: 0 on success or error code in case of error
107 int rsa_parse_pub_key(struct rsa_key
*rsa_key
, const void *key
,
108 unsigned int key_len
)
113 ret
= asn1_ber_decoder(&rsapubkey_decoder
, rsa_key
, key
, key_len
);
122 EXPORT_SYMBOL_GPL(rsa_parse_pub_key
);
125 * rsa_parse_pub_key() - extracts an rsa private key from BER encoded buffer
126 * and stores it in the provided struct rsa_key
128 * @rsa_key: struct rsa_key key representation
129 * @key: key in BER format
130 * @key_len: length of key
132 * Return: 0 on success or error code in case of error
134 int rsa_parse_priv_key(struct rsa_key
*rsa_key
, const void *key
,
135 unsigned int key_len
)
140 ret
= asn1_ber_decoder(&rsaprivkey_decoder
, rsa_key
, key
, key_len
);
149 EXPORT_SYMBOL_GPL(rsa_parse_priv_key
);