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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/crypto/openssl/enc_provider/des3.c */
/*
* Copyright (C) 2009 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "crypto_int.h"
#include <openssl/evp.h>
#define DES3_BLOCK_SIZE 8
#define DES3_KEY_SIZE 24
#define DES3_KEY_BYTES 21
static krb5_error_code
validate(krb5_key key, const krb5_data *ivec, const krb5_crypto_iov *data,
size_t num_data, krb5_boolean *empty)
{
size_t input_length = iov_total_length(data, num_data, FALSE);
if (key->keyblock.length != DES3_KEY_SIZE)
return(KRB5_BAD_KEYSIZE);
if ((input_length%DES3_BLOCK_SIZE) != 0)
return(KRB5_BAD_MSIZE);
if (ivec && (ivec->length != 8))
return(KRB5_BAD_MSIZE);
*empty = (input_length == 0);
return 0;
}
static krb5_error_code
k5_des3_encrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
size_t num_data)
{
int ret, olen = DES3_BLOCK_SIZE;
unsigned char iblock[DES3_BLOCK_SIZE], oblock[DES3_BLOCK_SIZE];
struct iov_cursor cursor;
EVP_CIPHER_CTX ciph_ctx;
krb5_boolean empty;
ret = validate(key, ivec, data, num_data, &empty);
if (ret != 0 || empty)
return ret;
EVP_CIPHER_CTX_init(&ciph_ctx);
ret = EVP_EncryptInit_ex(&ciph_ctx, EVP_des_ede3_cbc(), NULL,
key->keyblock.contents,
(ivec) ? (unsigned char*)ivec->data : NULL);
if (!ret)
return KRB5_CRYPTO_INTERNAL;
EVP_CIPHER_CTX_set_padding(&ciph_ctx,0);
k5_iov_cursor_init(&cursor, data, num_data, DES3_BLOCK_SIZE, FALSE);
while (k5_iov_cursor_get(&cursor, iblock)) {
ret = EVP_EncryptUpdate(&ciph_ctx, oblock, &olen,
(unsigned char *)iblock, DES3_BLOCK_SIZE);
if (!ret)
break;
k5_iov_cursor_put(&cursor, oblock);
}
if (ivec != NULL)
memcpy(ivec->data, oblock, DES3_BLOCK_SIZE);
EVP_CIPHER_CTX_cleanup(&ciph_ctx);
zap(iblock, sizeof(iblock));
zap(oblock, sizeof(oblock));
if (ret != 1)
return KRB5_CRYPTO_INTERNAL;
return 0;
}
static krb5_error_code
k5_des3_decrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
size_t num_data)
{
int ret, olen = DES3_BLOCK_SIZE;
unsigned char iblock[DES3_BLOCK_SIZE], oblock[DES3_BLOCK_SIZE];
struct iov_cursor cursor;
EVP_CIPHER_CTX ciph_ctx;
krb5_boolean empty;
ret = validate(key, ivec, data, num_data, &empty);
if (ret != 0 || empty)
return ret;
EVP_CIPHER_CTX_init(&ciph_ctx);
ret = EVP_DecryptInit_ex(&ciph_ctx, EVP_des_ede3_cbc(), NULL,
key->keyblock.contents,
(ivec) ? (unsigned char*)ivec->data : NULL);
if (!ret)
return KRB5_CRYPTO_INTERNAL;
EVP_CIPHER_CTX_set_padding(&ciph_ctx,0);
k5_iov_cursor_init(&cursor, data, num_data, DES3_BLOCK_SIZE, FALSE);
while (k5_iov_cursor_get(&cursor, iblock)) {
ret = EVP_DecryptUpdate(&ciph_ctx, oblock, &olen,
(unsigned char *)iblock, DES3_BLOCK_SIZE);
if (!ret)
break;
k5_iov_cursor_put(&cursor, oblock);
}
if (ivec != NULL)
memcpy(ivec->data, iblock, DES3_BLOCK_SIZE);
EVP_CIPHER_CTX_cleanup(&ciph_ctx);
zap(iblock, sizeof(iblock));
zap(oblock, sizeof(oblock));
if (ret != 1)
return KRB5_CRYPTO_INTERNAL;
return 0;
}
const struct krb5_enc_provider krb5int_enc_des3 = {
DES3_BLOCK_SIZE,
DES3_KEY_BYTES, DES3_KEY_SIZE,
k5_des3_encrypt,
k5_des3_decrypt,
NULL,
krb5int_des_init_state,
krb5int_default_free_state
};
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