string_to_key.c   [plain text]

/*
 * Copyright (C) 1998 by the FundsXpress, INC.
 * 
 * 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 FundsXpress. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  FundsXpress makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "k5-int.h"
#include "etypes.h"

krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key_with_params(krb5_context context,
				 krb5_enctype enctype,
				 const krb5_data *string,
				 const krb5_data *salt,
				 const krb5_data *params,
				 krb5_keyblock *key);


krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key(krb5_context context, krb5_enctype enctype,
		     const krb5_data *string, const krb5_data *salt,
		     krb5_keyblock *key)
{
    return krb5_c_string_to_key_with_params(context, enctype, string, salt,
					    NULL, key);
}

krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key_with_params(krb5_context context, krb5_enctype enctype,
				 const krb5_data *string,
				 const krb5_data *salt,
				 const krb5_data *params, krb5_keyblock *key)
{
    int i;
    krb5_error_code ret;
    const struct krb5_enc_provider *enc;
    size_t keybytes, keylength;

    for (i=0; i<krb5_enctypes_length; i++) {
	if (krb5_enctypes_list[i].etype == enctype)
	    break;
    }

    if (i == krb5_enctypes_length)
	return(KRB5_BAD_ENCTYPE);

    enc = krb5_enctypes_list[i].enc;
/* xxx AFS string2key function is indicated by a special length  in
 * the salt in much of the code.  However only the DES enctypes can
 * deal with this.  Using s2kparams would be a much better solution.*/
    if (salt && salt->length == SALT_TYPE_AFS_LENGTH) {
	switch (enctype) {
	case ENCTYPE_DES_CBC_CRC:
	case ENCTYPE_DES_CBC_MD4:
	case ENCTYPE_DES_CBC_MD5:
	    break;
	default:
	    return (KRB5_CRYPTO_INTERNAL);
	}
    }

    keybytes = enc->keybytes;
    keylength = enc->keylength;

    if ((key->contents = (krb5_octet *) malloc(keylength)) == NULL)
	return(ENOMEM);

    key->magic = KV5M_KEYBLOCK;
    key->enctype = enctype;
    key->length = keylength;

    ret = (*krb5_enctypes_list[i].str2key)(enc, string, salt, params, key);
    if (ret) {
	memset(key->contents, 0, keylength);
	free(key->contents);
    }

    return(ret);
}