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/*
* RSA key extract helper
*
* Copyright (c) 2015, Intel Corporation
* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
*
* 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.
*
*/
#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 (!*ptr && n_sz) {
ptr++;
n_sz--;
}
/* In FIPS mode only allow key size 2K & 3K */
if (n_sz != 256 && n_sz != 384) {
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;
}
/**
* 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);
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