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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/crypto/aead.h
*
* Copyright 2008, 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.
*/
#include "k5-int.h"
#include "cksumtypes.h"
/* AEAD helpers */
krb5_crypto_iov *
krb5int_c_locate_iov(krb5_crypto_iov *data,
size_t num_data,
krb5_cryptotype type);
krb5_error_code
krb5int_c_make_checksum_iov(const struct krb5_cksumtypes *cksum,
krb5_key key,
krb5_keyusage usage,
const krb5_crypto_iov *data,
size_t num_data,
krb5_data *cksum_data);
const struct krb5_cksumtypes *
krb5int_c_find_checksum_type(krb5_cksumtype cksumtype);
#define ENCRYPT_CONF_IOV(_iov) ((_iov)->flags == KRB5_CRYPTO_TYPE_HEADER)
#define ENCRYPT_DATA_IOV(_iov) ((_iov)->flags == KRB5_CRYPTO_TYPE_DATA || \
(_iov)->flags == KRB5_CRYPTO_TYPE_PADDING)
#define ENCRYPT_IOV(_iov) (ENCRYPT_CONF_IOV(_iov) || ENCRYPT_DATA_IOV(_iov))
#define SIGN_IOV(_iov) (ENCRYPT_IOV(_iov) || \
(_iov)->flags == KRB5_CRYPTO_TYPE_SIGN_ONLY )
struct iov_block_state {
size_t iov_pos; /* index into iov array */
size_t data_pos; /* index into iov contents */
unsigned int ignore_header : 1; /* have/should we process HEADER */
unsigned int include_sign_only : 1; /* should we process SIGN_ONLY blocks */
unsigned int pad_to_boundary : 1; /* should we zero fill blocks until next buffer */
};
#define IOV_BLOCK_STATE_INIT(_state) ((_state)->iov_pos = \
(_state)->data_pos = \
(_state)->ignore_header = \
(_state)->include_sign_only = \
(_state)->pad_to_boundary = 0)
krb5_boolean
krb5int_c_iov_get_block(unsigned char *block,
size_t block_size,
const krb5_crypto_iov *data,
size_t num_data,
struct iov_block_state *iov_state);
krb5_boolean
krb5int_c_iov_put_block(const krb5_crypto_iov *data,
size_t num_data,
unsigned char *block,
size_t block_size,
struct iov_block_state *iov_state);
krb5_error_code
krb5int_c_iov_decrypt_stream(const struct krb5_aead_provider *aead,
const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
krb5_key key,
krb5_keyusage keyusage,
const krb5_data *ivec,
krb5_crypto_iov *data,
size_t num_data);
krb5_error_code
krb5int_c_decrypt_aead_compat(const struct krb5_aead_provider *aead,
const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
krb5_key key, krb5_keyusage usage,
const krb5_data *ivec, const krb5_data *input,
krb5_data *output);
krb5_error_code
krb5int_c_encrypt_aead_compat(const struct krb5_aead_provider *aead,
const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
krb5_key key, krb5_keyusage usage,
const krb5_data *ivec, const krb5_data *input,
krb5_data *output);
void
krb5int_c_encrypt_length_aead_compat(const struct krb5_aead_provider *aead,
const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
size_t inputlen, size_t *length);
krb5_error_code
krb5int_c_padding_length(const struct krb5_aead_provider *aead,
const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
size_t data_length,
unsigned int *pad_length);
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