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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * RSA key extract helper4 *5 * Copyright (c) 2015, Intel Corporation6 * 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 the153 * 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 representation157 * @key: key in BER format158 * @key_len: length of key159 *160 * Return: 0 on success or error code in case of error161 */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 the171 * provided struct rsa_key, pointers to the raw key172 * as is, so that the caller can copy it or MPI parse it,173 * etc.174 *175 * @rsa_key: struct rsa_key key representation176 * @key: key in BER format177 * @key_len: length of key178 *179 * Return: 0 on success or error code in case of error180 */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