122 lines
2.6 KiB
C
122 lines
2.6 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 "rsakey-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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key->n = mpi_read_raw_data(value, vlen);
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if (!key->n)
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return -ENOMEM;
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/* In FIPS mode only allow key size 2K & 3K */
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if (fips_enabled && (mpi_get_size(key->n) != 256 &&
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mpi_get_size(key->n) != 384)) {
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pr_err("RSA: key size not allowed in FIPS mode\n");
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mpi_free(key->n);
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key->n = NULL;
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return -EINVAL;
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}
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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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key->e = mpi_read_raw_data(value, vlen);
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if (!key->e)
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return -ENOMEM;
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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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key->d = mpi_read_raw_data(value, vlen);
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if (!key->d)
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return -ENOMEM;
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/* In FIPS mode only allow key size 2K & 3K */
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if (fips_enabled && (mpi_get_size(key->d) != 256 &&
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mpi_get_size(key->d) != 384)) {
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pr_err("RSA: key size not allowed in FIPS mode\n");
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mpi_free(key->d);
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key->d = NULL;
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return -EINVAL;
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}
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return 0;
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}
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static void free_mpis(struct rsa_key *key)
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{
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mpi_free(key->n);
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mpi_free(key->e);
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mpi_free(key->d);
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key->n = NULL;
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key->e = NULL;
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key->d = NULL;
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}
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/**
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* rsa_free_key() - frees rsa key allocated by rsa_parse_key()
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*
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* @rsa_key: struct rsa_key key representation
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*/
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void rsa_free_key(struct rsa_key *key)
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{
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free_mpis(key);
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}
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EXPORT_SYMBOL_GPL(rsa_free_key);
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/**
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* rsa_parse_key() - extracts an rsa key from BER encoded buffer
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* and stores it in the provided struct rsa_key
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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_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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int ret;
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free_mpis(rsa_key);
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ret = asn1_ber_decoder(&rsakey_decoder, rsa_key, key, key_len);
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if (ret < 0)
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goto error;
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return 0;
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error:
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free_mpis(rsa_key);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rsa_parse_key);
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