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https://github.com/torvalds/linux
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5a7de97309
Return the raw key with no other processing so that the caller can copy it or MPI parse it, etc. The scope is to have only one ANS.1 parser for all RSA implementations. Update the RSA software implementation so that it does the MPI conversion on top. Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* RSA key extract helper
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*
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* Copyright (c) 2015, Intel Corporation
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/fips.h>
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#include <crypto/internal/rsa.h>
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#include "rsapubkey-asn1.h"
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#include "rsaprivkey-asn1.h"
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int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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const u8 *ptr = value;
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size_t n_sz = vlen;
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/* invalid key provided */
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if (!value || !vlen)
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return -EINVAL;
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if (fips_enabled) {
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while (!*ptr && n_sz) {
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ptr++;
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n_sz--;
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}
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/* In FIPS mode only allow key size 2K & 3K */
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if (n_sz != 256 && n_sz != 384) {
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pr_err("RSA: key size not allowed in FIPS mode\n");
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return -EINVAL;
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}
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}
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key->n = value;
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key->n_sz = vlen;
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return 0;
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}
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int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->e = value;
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key->e_sz = vlen;
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return 0;
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}
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int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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/* invalid key provided */
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if (!value || !key->n_sz || !vlen || vlen > key->n_sz)
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return -EINVAL;
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key->d = value;
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key->d_sz = vlen;
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return 0;
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}
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/**
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* rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the
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* provided struct rsa_key, pointers to the raw key as is,
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* so that the caller can copy it or MPI parse it, etc.
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*
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* @rsa_key: struct rsa_key key representation
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* @key: key in BER format
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* @key_len: length of key
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*
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* Return: 0 on success or error code in case of error
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*/
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int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
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unsigned int key_len)
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{
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return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len);
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}
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EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
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/**
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* rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the
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* provided struct rsa_key, pointers to the raw key
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* as is, so that the caller can copy it or MPI parse it,
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* etc.
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*
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* @rsa_key: struct rsa_key key representation
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* @key: key in BER format
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* @key_len: length of key
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*
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* Return: 0 on success or error code in case of error
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*/
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int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
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unsigned int key_len)
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{
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return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len);
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}
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EXPORT_SYMBOL_GPL(rsa_parse_priv_key);
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