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/*
 *  linux/include/linux/sunrpc/gss_krb5_types.h
 *
 *  Adapted from MIT Kerberos 5-1.2.1 lib/include/krb5.h,
 *  lib/gssapi/krb5/gssapiP_krb5.h, and others
 *
 *  Copyright (c) 2000 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Andy Adamson   <andros@umich.edu>
 *  Bruce Fields   <bfields@umich.edu>
 */


/*
 * Copyright 1995 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 <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/sunrpc/gss_asn1.h>

struct krb5_ctx {
        int                     initiate; /* 1 = initiating, 0 = accepting */
        int                     seed_init;
        unsigned char           seed[16];
        int                     signalg;
        int                     sealalg;
        struct crypto_tfm       *enc;
        struct crypto_tfm       *seq;
        s32                     endtime;
        u32                     seq_send;
        u32                     seq_recv;
        struct xdr_netobj       mech_used;
};

#define KG_TOK_MIC_MSG    0x0101
#define KG_TOK_WRAP_MSG   0x0201

enum sgn_alg {
        SGN_ALG_DES_MAC_MD5 = 0x0000,
        SGN_ALG_MD2_5 = 0x0001,
        SGN_ALG_DES_MAC = 0x0002,
        SGN_ALG_3 = 0x0003,             /* not published */
        SGN_ALG_HMAC_MD5 = 0x0011,      /* microsoft w2k; no support */
        SGN_ALG_HMAC_SHA1_DES3_KD = 0x0004
};
enum seal_alg {
        SEAL_ALG_NONE = 0xffff,
        SEAL_ALG_DES = 0x0000,
        SEAL_ALG_1 = 0x0001,            /* not published */
        SEAL_ALG_MICROSOFT_RC4 = 0x0010,/* microsoft w2k; no support */
        SEAL_ALG_DES3KD = 0x0002
};

#define RSA_MD5_CKSUM_LENGTH 16

#define CKSUMTYPE_CRC32                 0x0001
#define CKSUMTYPE_RSA_MD4               0x0002
#define CKSUMTYPE_RSA_MD4_DES           0x0003
#define CKSUMTYPE_DESCBC                0x0004
#define CKSUMTYPE_RSA_MD5               0x0007
#define CKSUMTYPE_RSA_MD5_DES           0x0008
#define CKSUMTYPE_NIST_SHA              0x0009
#define CKSUMTYPE_HMAC_SHA1_DES3        0x000c

/* from gssapi_err_krb5.h */
#define KG_CCACHE_NOMATCH                        (39756032L)
#define KG_KEYTAB_NOMATCH                        (39756033L)
#define KG_TGT_MISSING                           (39756034L)
#define KG_NO_SUBKEY                             (39756035L)
#define KG_CONTEXT_ESTABLISHED                   (39756036L)
#define KG_BAD_SIGN_TYPE                         (39756037L)
#define KG_BAD_LENGTH                            (39756038L)
#define KG_CTX_INCOMPLETE                        (39756039L)
#define KG_CONTEXT                               (39756040L)
#define KG_CRED                                  (39756041L)
#define KG_ENC_DESC                              (39756042L)
#define KG_BAD_SEQ                               (39756043L)
#define KG_EMPTY_CCACHE                          (39756044L)
#define KG_NO_CTYPES                             (39756045L)

#define KV5M_PRINCIPAL                           (-1760647423L)
#define KV5M_KEYBLOCK                            (-1760647421L)
#define KV5M_CHECKSUM                            (-1760647420L)
#define KV5M_ADDRESS                             (-1760647390L)
#define KV5M_AUTHENTICATOR                       (-1760647410L)
#define KV5M_AUTH_CONTEXT                        (-1760647383L)
#define KV5M_AUTHDATA                            (-1760647414L)
#define KV5M_GSS_OID                             (-1760647372L)
#define KV5M_GSS_QUEUE                           (-1760647371L)

/* per Kerberos v5 protocol spec crypto types from the wire.
 * these get mapped to linux kernel crypto routines.  
 */

#define ENCTYPE_NULL            0x0000
#define ENCTYPE_DES_CBC_CRC     0x0001  /* DES cbc mode with CRC-32 */
#define ENCTYPE_DES_CBC_MD4     0x0002  /* DES cbc mode with RSA-MD4 */
#define ENCTYPE_DES_CBC_MD5     0x0003  /* DES cbc mode with RSA-MD5 */
#define ENCTYPE_DES_CBC_RAW     0x0004  /* DES cbc mode raw */
/* XXX deprecated? */
#define ENCTYPE_DES3_CBC_SHA    0x0005  /* DES-3 cbc mode with NIST-SHA */
#define ENCTYPE_DES3_CBC_RAW    0x0006  /* DES-3 cbc mode raw */
#define ENCTYPE_DES_HMAC_SHA1   0x0008
#define ENCTYPE_DES3_CBC_SHA1   0x0010
#define ENCTYPE_UNKNOWN         0x01ff

s32
krb5_make_checksum(s32 cksumtype,
                   struct xdr_netobj *input,
                   struct xdr_netobj *cksum);

u32
krb5_make_token(struct krb5_ctx *context_handle, int qop_req,
        struct xdr_netobj * input_message_buffer,
        struct xdr_netobj * output_message_buffer, int toktype);

u32
krb5_read_token(struct krb5_ctx *context_handle,
          struct xdr_netobj *input_token_buffer,
          struct xdr_netobj *message_buffer,
          int *qop_state, int toktype);

u32
krb5_encrypt(struct crypto_tfm * key,
             void *iv, void *in, void *out, int length);

u32
krb5_decrypt(struct crypto_tfm * key,
             void *iv, void *in, void *out, int length);

s32
krb5_make_seq_num(struct crypto_tfm * key,
                int direction,
                s32 seqnum, unsigned char *cksum, unsigned char *buf);

s32
krb5_get_seq_num(struct crypto_tfm * key,
               unsigned char *cksum,
               unsigned char *buf, int *direction, s32 * seqnum);