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re-organize and add 3DES code

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@9004 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
2000-08-27 04:26:12 +00:00
parent 2662f930e7
commit 8180bca1d4
6 changed files with 1288 additions and 106 deletions
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282
lib/gssapi/wrap.c
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@@ -35,7 +35,24 @@
RCSID("$Id$");
OM_uint32 gss_wrap_size_limit (
static OM_uint32
sub_wrap_size (
OM_uint32 req_output_size,
OM_uint32 * max_input_size,
int blocksize,
int extrasize
)
{
size_t len, total_len, padlength;
padlength = blocksize - (req_output_size % blocksize);
len = req_output_size + 8 + padlength + extrasize;
gssapi_krb5_encap_length(len, &len, &total_len);
*max_input_size = (OM_uint32)total_len;
return GSS_S_COMPLETE;
}
OM_uint32
gss_wrap_size_limit (
OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
@@ -44,36 +61,58 @@ OM_uint32 gss_wrap_size_limit (
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;
krb5_keyblock *key;
OM_uint32 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = sub_wrap_size(req_output_size, max_input_size, 8, 22);
break;
case KEYTYPE_DES3 :
ret = sub_wrap_size(req_output_size, max_input_size, 8, 34);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}
OM_uint32 gss_wrap
static OM_uint32
wrap_des
(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
gss_buffer_t output_message_buffer,
krb5_keyblock *key
)
{
u_char *p;
MD5_CTX md5;
u_char hash[16];
des_key_schedule schedule;
des_cblock key;
des_cblock deskey;
des_cblock zero;
int i;
int32_t seq_number;
size_t len, total_len, padlength;
size_t len, total_len, padlength, datalen;
padlength = 8 - (input_message_buffer->length % 8);
len = input_message_buffer->length + 8 + padlength + 22;
datalen = input_message_buffer->length + padlength + 8;
len = datalen + 22;
gssapi_krb5_encap_length (len, &len, &total_len);
output_message_buffer->length = total_len;
@@ -83,8 +122,7 @@ OM_uint32 gss_wrap
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01");
"\x02\x01"); /* TOK_ID */
/* SGN_ALG */
memcpy (p, "\x00\x00", 2);
@@ -112,12 +150,12 @@ OM_uint32 gss_wrap
/* checksum */
MD5Init (&md5);
MD5Update (&md5, p - 24, 8);
MD5Update (&md5, p, input_message_buffer->length + padlength + 8);
MD5Update (&md5, p, datalen);
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
gss_krb5_getsomekey(context_handle, &key);
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
memcpy (p - 8, hash, 8);
@@ -136,7 +174,7 @@ OM_uint32 gss_wrap
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)(p + 8), DES_ENCRYPT);
@@ -148,22 +186,218 @@ OM_uint32 gss_wrap
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);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
for (i = 0; i < sizeof(deskey); ++i)
deskey[i] ^= 0xf0;
des_set_key (&deskey, schedule);
memset (&zero, 0, sizeof(zero));
des_cbc_encrypt ((void *)p,
(void *)p,
8 + input_message_buffer->length + padlength,
datalen,
schedule,
&zero,
DES_ENCRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
}
if(conf_state != NULL)
*conf_state = conf_req_flag;
return GSS_S_COMPLETE;
}
static OM_uint32
wrap_des3
(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,
krb5_keyblock *key
)
{
u_char *p;
u_char seq[8];
int32_t seq_number;
size_t len, total_len, padlength, datalen;
u_int32_t ret;
krb5_crypto crypto;
Checksum cksum;
krb5_data encdata;
padlength = 8 - (input_message_buffer->length % 8);
datalen = input_message_buffer->length + padlength + 8;
len = datalen + 34;
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"); /* TOK_ID */
/* SGN_ALG */
memcpy (p, "\x04\x00", 2); /* HMAC SHA1 DES3-KD */
p += 2;
/* SEAL_ALG */
if(conf_req_flag)
memcpy (p, "\x02\x00", 2); /* DES3-KD */
else
memcpy (p, "\xff\xff", 2);
p += 2;
/* Filler */
memcpy (p, "\xff\xff", 2);
p += 2;
/* calculate checksum (the above + confounder + data + pad) */
memcpy (p + 20, p - 8, 8);
des_new_random_key((des_cblock*)(p + 28));
memcpy (p + 28 + 8, input_message_buffer->value,
input_message_buffer->length);
memset (p + 28 + 8 + input_message_buffer->length, padlength, padlength);
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_create_checksum (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SIGN,
p + 20,
datalen + 8,
&cksum);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
/* zero out SND_SEQ + SGN_CKSUM in case */
memset (p, 0, 28);
memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
free_Checksum (&cksum);
/* sequence number */
krb5_auth_getlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
&seq_number);
seq[0] = (seq_number >> 0) & 0xFF;
seq[1] = (seq_number >> 8) & 0xFF;
seq[2] = (seq_number >> 16) & 0xFF;
seq[3] = (seq_number >> 24) & 0xFF;
memset (seq + 4,
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
ret = krb5_crypto_init(gssapi_krb5_context, key, ETYPE_DES3_CBC_NONE,
&crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_encrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
seq, 8, &encdata);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (encdata.length == 8);
memcpy (p, encdata.data, encdata.length);
krb5_data_free (&encdata);
krb5_auth_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
/* encrypt the data */
p += 28;
if(conf_req_flag) {
krb5_data tmp;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_encrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
p, datalen, &tmp);
krb5_crypto_destroy(gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (tmp.length == datalen);
memcpy (p, tmp.data, datalen);
krb5_data_free(&tmp);
}
if(conf_state != NULL)
*conf_state = conf_req_flag;
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
)
{
krb5_keyblock *key;
OM_uint32 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = wrap_des (minor_status, context_handle, conf_req_flag,
qop_req, input_message_buffer, conf_state,
output_message_buffer, key);
break;
case KEYTYPE_DES3 :
ret = wrap_des3 (minor_status, context_handle, conf_req_flag,
qop_req, input_message_buffer, conf_state,
output_message_buffer, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}