linux/crypto/rsa_helper.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * RSA key extract helper
   4 *
   5 * Copyright (c) 2015, Intel Corporation
   6 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
   7 */
   8#include <linux/kernel.h>
   9#include <linux/export.h>
  10#include <linux/err.h>
  11#include <linux/fips.h>
  12#include <crypto/internal/rsa.h>
  13#include "rsapubkey.asn1.h"
  14#include "rsaprivkey.asn1.h"
  15
  16int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
  17              const void *value, size_t vlen)
  18{
  19        struct rsa_key *key = context;
  20        const u8 *ptr = value;
  21        size_t n_sz = vlen;
  22
  23        /* invalid key provided */
  24        if (!value || !vlen)
  25                return -EINVAL;
  26
  27        if (fips_enabled) {
  28                while (n_sz && !*ptr) {
  29                        ptr++;
  30                        n_sz--;
  31                }
  32
  33                /* In FIPS mode only allow key size 2K and higher */
  34                if (n_sz < 256) {
  35                        pr_err("RSA: key size not allowed in FIPS mode\n");
  36                        return -EINVAL;
  37                }
  38        }
  39
  40        key->n = value;
  41        key->n_sz = vlen;
  42
  43        return 0;
  44}
  45
  46int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
  47              const void *value, size_t vlen)
  48{
  49        struct rsa_key *key = context;
  50
  51        /* invalid key provided */
  52        if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
  53                return -EINVAL;
  54
  55        key->e = value;
  56        key->e_sz = vlen;
  57
  58        return 0;
  59}
  60
  61int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
  62              const void *value, size_t vlen)
  63{
  64        struct rsa_key *key = context;
  65
  66        /* invalid key provided */
  67        if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
  68                return -EINVAL;
  69
  70        key->d = value;
  71        key->d_sz = vlen;
  72
  73        return 0;
  74}
  75
  76int rsa_get_p(void *context, size_t hdrlen, unsigned char tag,
  77              const void *value, size_t vlen)
  78{
  79        struct rsa_key *key = context;
  80
  81        /* invalid key provided */
  82        if (!value || !vlen || vlen > key->n_sz)
  83                return -EINVAL;
  84
  85        key->p = value;
  86        key->p_sz = vlen;
  87
  88        return 0;
  89}
  90
  91int rsa_get_q(void *context, size_t hdrlen, unsigned char tag,
  92              const void *value, size_t vlen)
  93{
  94        struct rsa_key *key = context;
  95
  96        /* invalid key provided */
  97        if (!value || !vlen || vlen > key->n_sz)
  98                return -EINVAL;
  99
 100        key->q = value;
 101        key->q_sz = vlen;
 102
 103        return 0;
 104}
 105
 106int rsa_get_dp(void *context, size_t hdrlen, unsigned char tag,
 107               const void *value, size_t vlen)
 108{
 109        struct rsa_key *key = context;
 110
 111        /* invalid key provided */
 112        if (!value || !vlen || vlen > key->n_sz)
 113                return -EINVAL;
 114
 115        key->dp = value;
 116        key->dp_sz = vlen;
 117
 118        return 0;
 119}
 120
 121int rsa_get_dq(void *context, size_t hdrlen, unsigned char tag,
 122               const void *value, size_t vlen)
 123{
 124        struct rsa_key *key = context;
 125
 126        /* invalid key provided */
 127        if (!value || !vlen || vlen > key->n_sz)
 128                return -EINVAL;
 129
 130        key->dq = value;
 131        key->dq_sz = vlen;
 132
 133        return 0;
 134}
 135
 136int rsa_get_qinv(void *context, size_t hdrlen, unsigned char tag,
 137                 const void *value, size_t vlen)
 138{
 139        struct rsa_key *key = context;
 140
 141        /* invalid key provided */
 142        if (!value || !vlen || vlen > key->n_sz)
 143                return -EINVAL;
 144
 145        key->qinv = value;
 146        key->qinv_sz = vlen;
 147
 148        return 0;
 149}
 150
 151/**
 152 * rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the
 153 *                       provided struct rsa_key, pointers to the raw key as is,
 154 *                       so that the caller can copy it or MPI parse it, etc.
 155 *
 156 * @rsa_key:    struct rsa_key key representation
 157 * @key:        key in BER format
 158 * @key_len:    length of key
 159 *
 160 * Return:      0 on success or error code in case of error
 161 */
 162int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
 163                      unsigned int key_len)
 164{
 165        return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
 166}
 167EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
 168
 169/**
 170 * rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the
 171 *                        provided struct rsa_key, pointers to the raw key
 172 *                        as is, so that the caller can copy it or MPI parse it,
 173 *                        etc.
 174 *
 175 * @rsa_key:    struct rsa_key key representation
 176 * @key:        key in BER format
 177 * @key_len:    length of key
 178 *
 179 * Return:      0 on success or error code in case of error
 180 */
 181int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
 182                       unsigned int key_len)
 183{
 184        return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
 185}
 186EXPORT_SYMBOL_GPL(rsa_parse_priv_key);
 187
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