linux/crypto/rsa_helper.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

187 lines
4.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* RSA key extract helper
*
* Copyright (c) 2015, Intel Corporation
* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/fips.h>
#include <crypto/internal/rsa.h>
#include "rsapubkey.asn1.h"
#include "rsaprivkey.asn1.h"
int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
const u8 *ptr = value;
size_t n_sz = vlen;
/* invalid key provided */
if (!value || !vlen)
return -EINVAL;
if (fips_enabled) {
while (n_sz && !*ptr) {
ptr++;
n_sz--;
}
/* In FIPS mode only allow key size 2K and higher */
if (n_sz < 256) {
pr_err("RSA: key size not allowed in FIPS mode\n");
return -EINVAL;
}
}
key->n = value;
key->n_sz = vlen;
return 0;
}
int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
return -EINVAL;
key->e = value;
key->e_sz = vlen;
return 0;
}
int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
return -EINVAL;
key->d = value;
key->d_sz = vlen;
return 0;
}
int rsa_get_p(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !vlen || vlen > key->n_sz)
return -EINVAL;
key->p = value;
key->p_sz = vlen;
return 0;
}
int rsa_get_q(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !vlen || vlen > key->n_sz)
return -EINVAL;
key->q = value;
key->q_sz = vlen;
return 0;
}
int rsa_get_dp(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !vlen || vlen > key->n_sz)
return -EINVAL;
key->dp = value;
key->dp_sz = vlen;
return 0;
}
int rsa_get_dq(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !vlen || vlen > key->n_sz)
return -EINVAL;
key->dq = value;
key->dq_sz = vlen;
return 0;
}
int rsa_get_qinv(void *context, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen)
{
struct rsa_key *key = context;
/* invalid key provided */
if (!value || !vlen || vlen > key->n_sz)
return -EINVAL;
key->qinv = value;
key->qinv_sz = vlen;
return 0;
}
/**
* rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the
* provided struct rsa_key, pointers to the raw key as is,
* so that the caller can copy it or MPI parse it, etc.
*
* @rsa_key: struct rsa_key key representation
* @key: key in BER format
* @key_len: length of key
*
* Return: 0 on success or error code in case of error
*/
int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
unsigned int key_len)
{
return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
}
EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
/**
* rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the
* provided struct rsa_key, pointers to the raw key
* as is, so that the caller can copy it or MPI parse it,
* etc.
*
* @rsa_key: struct rsa_key key representation
* @key: key in BER format
* @key_len: length of key
*
* Return: 0 on success or error code in case of error
*/
int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
unsigned int key_len)
{
return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
}
EXPORT_SYMBOL_GPL(rsa_parse_priv_key);