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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