linux-imx

/*

 * RSA key extract helper

 *

 * Copyright (c) 2015, Intel Corporation

 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the Free

 * Software Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 */

#include <linux/kernel.h>

#include <linux/export.h>

#include <linux/err.h>

#include <linux/fips.h>

#include <crypto/internal/rsa.h>

#include "rsapubkey.asn1.h"

#include "rsaprivkey.asn1.h"

​

int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,

          const void *value, size_t vlen)

{

    struct rsa_key *key = context;

    const u8 *ptr = value;

    size_t n_sz = vlen;

​

    /* invalid key provided */

    if (!value || !vlen)

        return -EINVAL;

​

    if (fips_enabled) {

        while (n_sz && !*ptr) {

            ptr++;

            n_sz--;

        }

​

        /* In FIPS mode only allow key size 2K and higher */

        if (n_sz < 256) {

            pr_err("RSA: key size not allowed in FIPS mode\n");

            return -EINVAL;

        }

    }

​

    key->n = value;

    key->n_sz = vlen;

​

    return 0;

}

​

int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,

          const void *value, size_t vlen)

{

    struct rsa_key *key = context;

​

    /* invalid key provided */

    if (!value || !key->n_sz || !vlen || vlen > key->n_sz)

        return -EINVAL;

​

    key->e = value;

    key->e_sz = vlen;

​

    return 0;