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/*
* $Source$
* $Author$
* $Id$
*
* Copyright 1989,1990,1991 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. 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.
*
*
* Encryption interface-related declarations
*/
#ifndef KRB5_ENCRYPTION__
#define KRB5_ENCRYPTION__
typedef struct _krb5_keyblock {
krb5_keytype keytype;
int length;
krb5_octet *contents;
} krb5_keyblock;
typedef struct _krb5_checksum {
krb5_cksumtype checksum_type; /* checksum type */
int length;
krb5_octet *contents;
} krb5_checksum;
typedef struct _krb5_encrypt_block {
struct _krb5_cryptosystem_entry *crypto_entry;
krb5_keyblock *key;
krb5_pointer priv; /* for private use, e.g. DES
key schedules */
} krb5_encrypt_block;
typedef struct _krb5_enc_data {
krb5_enctype etype;
krb5_kvno kvno;
krb5_data ciphertext;
} krb5_enc_data;
#include <krb5/widen.h>
/* could be used in a table to find an etype and initialize a block */
typedef struct _krb5_cryptosystem_entry {
krb5_error_code (*encrypt_func) NPROTOTYPE((krb5_const_pointer /* in */,
krb5_pointer /* out */,
const size_t,
krb5_encrypt_block *,
krb5_pointer));
krb5_error_code (*decrypt_func) NPROTOTYPE((krb5_const_pointer /* in */,
krb5_pointer /* out */,
const size_t,
krb5_encrypt_block *,
krb5_pointer));
krb5_error_code (*process_key) NPROTOTYPE((krb5_encrypt_block *,
const krb5_keyblock *));
krb5_error_code (*finish_key) NPROTOTYPE((krb5_encrypt_block *));
krb5_error_code (*string_to_key) NPROTOTYPE((const krb5_keytype,
krb5_keyblock *,
const krb5_data *,
const krb5_data *));
krb5_error_code (*init_random_key) NPROTOTYPE((const krb5_keyblock *,
krb5_pointer *));
krb5_error_code (*finish_random_key) NPROTOTYPE((krb5_pointer *));
krb5_error_code (*random_key) NPROTOTYPE((krb5_pointer,
krb5_keyblock **));
int block_length;
int pad_minimum; /* needed for cksum size computation */
int keysize;
krb5_enctype proto_enctype; /* encryption type,
(assigned protocol number AND
table index) */
krb5_keytype proto_keytype; /* key type,
(assigned protocol number AND
table index) */
} krb5_cryptosystem_entry;
#include <krb5/narrow.h>
typedef struct _krb5_cs_table_entry {
krb5_cryptosystem_entry *system;
krb5_pointer random_sequence; /* from init_random_key() */
} krb5_cs_table_entry;
/* could be used in a table to find a sumtype */
typedef struct _krb5_checksum_entry {
krb5_error_code (*sum_func) NPROTOTYPE ((krb5_pointer /* in */,
size_t /* in_length */,
krb5_pointer /* key/seed */,
size_t /* key/seed size */,
krb5_checksum * /* out_cksum */));
int checksum_length; /* length of stuff returned by
sum_func */
unsigned int is_collision_proof:1;
unsigned int uses_key:1;
} krb5_checksum_entry;
/* per Kerberos v5 protocol spec */
#define KEYTYPE_NULL 0x0000
#define KEYTYPE_DES 0x0001 /* Data Encryption Standard,
FIPS 46,81 */
#define ETYPE_NULL 0x0000
#define ETYPE_DES_CBC_CRC 0x0001 /* DES cbc mode with CRC-32 */
#define ETYPE_DES_CBC_MD4 0x0002 /* DES cbc mode with RSA-MD4 */
#define ETYPE_DES_CBC_MD5 0x0003 /* DES cbc mode with RSA-MD5 */
#define CKSUMTYPE_CRC32 0x0001
#define CKSUMTYPE_RSA_MD4 0x0002
#define CKSUMTYPE_RSA_MD4_DES 0x0003
#define CKSUMTYPE_DESCBC 0x0004
/* des-mac */
/* des-mac-k */
#define CKSUMTYPE_RSA_MD5 0x0007
#define CKSUMTYPE_RSA_MD5_DES 0x0008
/* macros to determine if a type is a local type */
#define KEYTYPE_IS_LOCAL(keytype) (keytype & 0x8000)
#define ETYPE_IS_LOCAL(etype) (etype & 0x8000)
#define CKSUMTYPE_IS_LOCAL(cksumtype) (cksumtype & 0x8000)
#ifndef krb5_roundup
/* round x up to nearest multiple of y */
#define krb5_roundup(x, y) ((((x) + (y) - 1)/(y))*(y))
#endif /* roundup */
/* macro function definitions to help clean up code */
#define krb5_encrypt_size(length, crypto) \
krb5_roundup((length)+(crypto)->pad_minimum, (crypto)->block_length)
/* This array is indexed by encryption type */
extern krb5_cs_table_entry *krb5_csarray[];
extern int krb5_max_cryptosystem; /* max entry in array */
/* This array is indexed by key type, and has (should have) pointers to
the same entries as krb5_csarray */
/* XXX what if a given keytype works for several etypes? */
extern krb5_cs_table_entry *krb5_keytype_array[];
extern int krb5_max_keytype; /* max entry in array */
/* This array is indexed by checksum type */
extern krb5_checksum_entry *krb5_cksumarray[];
extern int krb5_max_cksum; /* max entry in array */
#define valid_etype(etype) ((etype <= krb5_max_cryptosystem) && (etype > 0) && krb5_csarray[etype])
#define valid_keytype(ktype) ((ktype <= krb5_max_keytype) && (ktype > 0) && krb5_keytype_array[ktype])
#define valid_cksumtype(cktype) ((cktype <= krb5_max_cksum) && (cktype > 0) && krb5_cksumarray[cktype])
#define is_coll_proof_cksum(cktype) (krb5_cksumarray[cktype]->is_collision_proof)
#define is_keyed_cksum(cktype) (krb5_cksumarray[cktype]->uses_key)
/* set up *eblockp to use etype */
#define krb5_use_cstype(eblockp, etype) (eblockp)->crypto_entry = krb5_csarray[(etype)]->system
/* ...or keytype */
#define krb5_use_keytype(eblockp, keytype) (eblockp)->crypto_entry = krb5_keytype_array[(keytype)]->system
#define krb5_encrypt(inptr, outptr, size, eblock, ivec) (*(eblock)->crypto_entry->encrypt_func)(inptr, outptr, size, eblock, ivec)
#define krb5_decrypt(inptr, outptr, size, eblock, ivec) (*(eblock)->crypto_entry->decrypt_func)(inptr, outptr, size, eblock, ivec)
#define krb5_process_key(eblock, key) (*(eblock)->crypto_entry->process_key)(eblock, key)
#define krb5_finish_key(eblock) (*(eblock)->crypto_entry->finish_key)(eblock)
#define krb5_string_to_key(eblock, keytype, keyblock, data, princ) (*(eblock)->crypto_entry->string_to_key)(keytype, keyblock, data, princ)
#define krb5_init_random_key(eblock, keyblock, ptr) (*(eblock)->crypto_entry->init_random_key)(keyblock, ptr)
#define krb5_finish_random_key(eblock, ptr) (*(eblock)->crypto_entry->finish_random_key)(ptr)
#define krb5_random_key(eblock, ptr, keyblock) (*(eblock)->crypto_entry->random_key)(ptr, keyblock)
/*
* Here's the stuff for the checksum switch:
*/
#define krb5_checksum_size(ctype) (krb5_cksumarray[ctype]->checksum_length)
#define krb5_calculate_checksum(ctype, in, in_length, seed, seed_length, outcksum) ((*krb5_cksumarray[ctype]->sum_func)(in, in_length, seed, seed_length, outcksum))
#endif /* KRB5_ENCRYPTION__ */
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