2015-06-16 20:31:01 +03:00
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/*
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* RSA key extract helper
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*
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* Copyright (c) 2015, Intel Corporation
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/fips.h>
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#include <crypto/internal/rsa.h>
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2015-10-08 19:26:55 +03:00
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#include "rsapubkey-asn1.h"
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#include "rsaprivkey-asn1.h"
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2015-06-16 20:31:01 +03:00
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int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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2016-06-14 16:14:58 +03:00
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const u8 *ptr = value;
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size_t n_sz = vlen;
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2015-06-16 20:31:01 +03:00
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2016-06-14 16:14:58 +03:00
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/* invalid key provided */
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if (!value || !vlen)
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2015-06-16 20:31:01 +03:00
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return -EINVAL;
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2016-06-14 16:14:58 +03:00
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if (fips_enabled) {
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2017-11-27 10:16:49 +03:00
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while (n_sz && !*ptr) {
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2016-06-14 16:14:58 +03:00
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ptr++;
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n_sz--;
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}
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2016-08-23 11:09:32 +03:00
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/* In FIPS mode only allow key size 2K and higher */
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if (n_sz < 256) {
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2016-06-14 16:14:58 +03:00
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pr_err("RSA: key size not allowed in FIPS mode\n");
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return -EINVAL;
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}
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2015-06-16 20:31:01 +03:00
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}
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2016-06-14 16:14:58 +03:00
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key->n = value;
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key->n_sz = vlen;
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2015-06-16 20:31:01 +03:00
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return 0;
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}
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int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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2016-06-14 16:14:58 +03:00
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/* invalid key provided */
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if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
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return -EINVAL;
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2015-06-16 20:31:01 +03:00
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2016-06-14 16:14:58 +03:00
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key->e = value;
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key->e_sz = vlen;
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2015-06-16 20:31:01 +03:00
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return 0;
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}
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int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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2016-06-14 16:14:58 +03:00
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/* invalid key provided */
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if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
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2015-06-16 20:31:01 +03:00
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return -EINVAL;
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2016-06-14 16:14:58 +03:00
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key->d = value;
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key->d_sz = vlen;
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2015-06-16 20:31:01 +03:00
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2016-06-14 16:14:58 +03:00
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return 0;
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2015-06-16 20:31:01 +03:00
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}
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2016-07-04 19:21:38 +03:00
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int rsa_get_p(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->p = value;
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key->p_sz = vlen;
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return 0;
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}
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int rsa_get_q(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->q = value;
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key->q_sz = vlen;
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return 0;
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}
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int rsa_get_dp(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->dp = value;
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key->dp_sz = vlen;
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return 0;
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}
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int rsa_get_dq(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->dq = value;
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key->dq_sz = vlen;
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return 0;
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}
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int rsa_get_qinv(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->qinv = value;
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key->qinv_sz = vlen;
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return 0;
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}
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2015-06-16 20:31:01 +03:00
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/**
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2016-06-14 16:14:58 +03:00
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* rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the
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* provided struct rsa_key, pointers to the raw key as is,
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* so that the caller can copy it or MPI parse it, etc.
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2015-06-16 20:31:01 +03:00
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*
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* @rsa_key: struct rsa_key key representation
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* @key: key in BER format
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* @key_len: length of key
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*
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* Return: 0 on success or error code in case of error
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*/
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2015-10-08 19:26:55 +03:00
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int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
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unsigned int key_len)
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2015-06-16 20:31:01 +03:00
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{
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2016-06-14 16:14:58 +03:00
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return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
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2015-06-16 20:31:01 +03:00
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}
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2015-10-08 19:26:55 +03:00
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EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
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/**
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2016-06-14 16:14:58 +03:00
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* rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the
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* provided struct rsa_key, pointers to the raw key
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* as is, so that the caller can copy it or MPI parse it,
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* etc.
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2015-10-08 19:26:55 +03:00
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*
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* @rsa_key: struct rsa_key key representation
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* @key: key in BER format
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* @key_len: length of key
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*
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* Return: 0 on success or error code in case of error
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*/
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int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
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unsigned int key_len)
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{
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2016-06-14 16:14:58 +03:00
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return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
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2015-10-08 19:26:55 +03:00
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}
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EXPORT_SYMBOL_GPL(rsa_parse_priv_key);
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