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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* lib/crypto/krb/enc_raw.c */
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/*
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* Copyright 2008 by the Massachusetts Institute of Technology.
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* All Rights Reserved.
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*
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* Export of this software from the United States of America may
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* require a specific license from the United States Government.
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* It is the responsibility of any person or organization contemplating
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* export to obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of M.I.T. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. Furthermore if you modify this software you must label
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* your software as modified software and not distribute it in such a
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* fashion that it might be confused with the original M.I.T. software.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*/
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#include "crypto_int.h"
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unsigned int
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krb5int_raw_crypto_length(const struct krb5_keytypes *ktp,
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krb5_cryptotype type)
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{
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switch (type) {
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case KRB5_CRYPTO_TYPE_PADDING:
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return ktp->enc->block_size;
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default:
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return 0;
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}
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}
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krb5_error_code
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krb5int_raw_encrypt(const struct krb5_keytypes *ktp, krb5_key key,
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krb5_keyusage usage, const krb5_data *ivec,
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krb5_crypto_iov *data, size_t num_data)
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{
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krb5_crypto_iov *padding;
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size_t i;
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unsigned int blocksize, plainlen = 0, padsize = 0;
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blocksize = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_PADDING);
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for (i = 0; i < num_data; i++) {
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krb5_crypto_iov *iov = &data[i];
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if (iov->flags == KRB5_CRYPTO_TYPE_DATA)
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plainlen += iov->data.length;
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}
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if (blocksize != 0) {
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/* Check that the input data is correctly padded */
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if (plainlen % blocksize)
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padsize = blocksize - (plainlen % blocksize);
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}
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padding = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
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if (padsize && (padding == NULL || padding->data.length < padsize))
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return KRB5_BAD_MSIZE;
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if (padding != NULL) {
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memset(padding->data.data, 0, padsize);
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padding->data.length = padsize;
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}
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return ktp->enc->encrypt(key, ivec, data, num_data);
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}
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krb5_error_code
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krb5int_raw_decrypt(const struct krb5_keytypes *ktp, krb5_key key,
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krb5_keyusage usage, const krb5_data *ivec,
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krb5_crypto_iov *data, size_t num_data)
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{
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size_t i;
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unsigned int blocksize = 0; /* enc block size, not confounder len */
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unsigned int cipherlen = 0;
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/* E(Confounder | Plaintext | Pad) | Checksum */
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blocksize = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_PADDING);
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for (i = 0; i < num_data; i++) {
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const krb5_crypto_iov *iov = &data[i];
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if (ENCRYPT_DATA_IOV(iov))
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cipherlen += iov->data.length;
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}
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if (blocksize == 0) {
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/* Check for correct input length in CTS mode */
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if (ktp->enc->block_size != 0 && cipherlen < ktp->enc->block_size)
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return KRB5_BAD_MSIZE;
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} else {
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/* Check that the input data is correctly padded */
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if (cipherlen % blocksize != 0)
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return KRB5_BAD_MSIZE;
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}
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return ktp->enc->decrypt(key, ivec, data, num_data);
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}
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