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Diffstat (limited to 'crypto/heimdal/lib/gssapi/wrap.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/wrap.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/wrap.c b/crypto/heimdal/lib/gssapi/wrap.c new file mode 100644 index 0000000..98ee689 --- /dev/null +++ b/crypto/heimdal/lib/gssapi/wrap.c @@ -0,0 +1,169 @@ +/* + * Copyright (c) 1997, 1998 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "gssapi_locl.h" + +RCSID("$Id: wrap.c,v 1.10 1999/12/02 17:05:04 joda Exp $"); + +OM_uint32 gss_wrap_size_limit ( + OM_uint32 * minor_status, + const gss_ctx_id_t context_handle, + int conf_req_flag, + gss_qop_t qop_req, + OM_uint32 req_output_size, + OM_uint32 * max_input_size + ) +{ + size_t len, total_len, padlength; + padlength = 8 - (req_output_size % 8); + len = req_output_size + 8 + padlength + 22; + gssapi_krb5_encap_length(len, &len, &total_len); + *max_input_size = (OM_uint32)total_len; + return GSS_S_COMPLETE; +} + +OM_uint32 gss_wrap + (OM_uint32 * minor_status, + const gss_ctx_id_t context_handle, + int conf_req_flag, + gss_qop_t qop_req, + const gss_buffer_t input_message_buffer, + int * conf_state, + gss_buffer_t output_message_buffer + ) +{ + u_char *p; + struct md5 md5; + u_char hash[16]; + des_key_schedule schedule; + des_cblock key; + des_cblock zero; + int i; + int32_t seq_number; + size_t len, total_len, padlength; + + padlength = 8 - (input_message_buffer->length % 8); + len = input_message_buffer->length + 8 + padlength + 22; + gssapi_krb5_encap_length (len, &len, &total_len); + + output_message_buffer->length = total_len; + output_message_buffer->value = malloc (total_len); + if (output_message_buffer->value == NULL) + return GSS_S_FAILURE; + + p = gssapi_krb5_make_header(output_message_buffer->value, + len, + "\x02\x01"); + + + /* SGN_ALG */ + memcpy (p, "\x00\x00", 2); + p += 2; + /* SEAL_ALG */ + if(conf_req_flag) + memcpy (p, "\x00\x00", 2); + else + memcpy (p, "\xff\xff", 2); + p += 2; + /* Filler */ + memcpy (p, "\xff\xff", 2); + p += 2; + + /* fill in later */ + memset (p, 0, 16); + p += 16; + + /* confounder + data + pad */ + des_new_random_key((des_cblock*)p); + memcpy (p + 8, input_message_buffer->value, + input_message_buffer->length); + memset (p + 8 + input_message_buffer->length, padlength, padlength); + + /* checksum */ + md5_init (&md5); + md5_update (&md5, p - 24, 8); + md5_update (&md5, p, input_message_buffer->length + padlength + 8); + md5_finito (&md5, hash); + + memset (&zero, 0, sizeof(zero)); + gss_krb5_getsomekey(context_handle, &key); + des_set_key (&key, schedule); + des_cbc_cksum ((des_cblock *)hash, + (des_cblock *)hash, sizeof(hash), schedule, &zero); + memcpy (p - 8, hash, 8); + + /* sequence number */ + krb5_auth_getlocalseqnumber (gssapi_krb5_context, + context_handle->auth_context, + &seq_number); + + p -= 16; + p[0] = (seq_number >> 0) & 0xFF; + p[1] = (seq_number >> 8) & 0xFF; + p[2] = (seq_number >> 16) & 0xFF; + p[3] = (seq_number >> 24) & 0xFF; + memset (p + 4, + (context_handle->more_flags & LOCAL) ? 0 : 0xFF, + 4); + + des_set_key (&key, schedule); + des_cbc_encrypt ((des_cblock *)p, (des_cblock *)p, 8, + schedule, (des_cblock *)(p + 8), DES_ENCRYPT); + + krb5_auth_setlocalseqnumber (gssapi_krb5_context, + context_handle->auth_context, + ++seq_number); + + /* encrypt the data */ + p += 16; + + if(conf_req_flag) { + gss_krb5_getsomekey(context_handle, &key); + for (i = 0; i < sizeof(key); ++i) + key[i] ^= 0xf0; + des_set_key (&key, schedule); + memset (&zero, 0, sizeof(zero)); + des_cbc_encrypt ((des_cblock *)p, + (des_cblock *)p, + 8 + input_message_buffer->length + padlength, + schedule, + &zero, + DES_ENCRYPT); + + memset (key, 0, sizeof(key)); + memset (schedule, 0, sizeof(schedule)); + } + if(conf_state != NULL) + *conf_state = conf_req_flag; + return GSS_S_COMPLETE; +} |
