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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/crypto/yarrow/ycipher.c
*
* Copyright (C) 2001, 2007 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.
*
*
*
* Routines to implement krb5 cipher operations.
*/
#include "k5-int.h"
#include "yarrow.h"
#include "ycipher.h"
#include "enc_provider.h"
#include "assert.h"
int
krb5int_yarrow_cipher_init
(CIPHER_CTX *ctx,
unsigned const char * key)
{
size_t keybytes, keylength;
const struct krb5_enc_provider *enc = &yarrow_enc_provider;
krb5_error_code ret;
krb5_data randombits;
krb5_keyblock keyblock;
keybytes = enc->keybytes;
keylength = enc->keylength;
assert (keybytes == CIPHER_KEY_SIZE);
krb5_k_free_key(NULL, ctx->key);
ctx->key = NULL;
keyblock.contents = malloc(keylength);
keyblock.length = keylength;
if (keyblock.contents == NULL)
return (YARROW_NOMEM);
randombits.data = (char *) key;
randombits.length = keybytes;
ret = enc->make_key(&randombits, &keyblock);
if (ret != 0)
goto cleanup;
ret = krb5_k_create_key(NULL, &keyblock, &ctx->key);
cleanup:
free(keyblock.contents);
if (ret)
return YARROW_FAIL;
return YARROW_OK;
}
int krb5int_yarrow_cipher_encrypt_block
(CIPHER_CTX *ctx, const unsigned char *in,
unsigned char *out)
{
krb5_error_code ret;
krb5_data ind, outd;
const struct krb5_enc_provider *enc = &yarrow_enc_provider;
ind.data = (char *) in;
ind.length = CIPHER_BLOCK_SIZE;
outd.data = (char *) out;
outd.length = CIPHER_BLOCK_SIZE;
ret = enc->encrypt(ctx->key, 0, &ind, &outd);
if (ret)
return YARROW_FAIL;
return YARROW_OK;
}
void
krb5int_yarrow_cipher_final
(CIPHER_CTX *ctx)
{
krb5_k_free_key(NULL, ctx->key);
ctx->key = NULL;
}
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