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md2.c
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/* md2.c - MD2 Message-Digest Algorithm
* Copyright (C) 2014 Dmitry Eremin-Solenikov
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include
<config.h>
#include
"g10lib.h"
#include
"cipher.h"
#include
"bithelp.h"
#include
"bufhelp.h"
#include
"hash-common.h"
typedef
struct
{
gcry_md_block_ctx_t
bctx
;
unsigned
char
C
[
16
];
unsigned
char
L
;
unsigned
char
X
[
48
];
}
MD2_CONTEXT
;
static
const
unsigned
char
S
[]
=
{
0x29
,
0x2E
,
0x43
,
0xC9
,
0xA2
,
0xD8
,
0x7C
,
0x01
,
0x3D
,
0x36
,
0x54
,
0xA1
,
0xEC
,
0xF0
,
0x06
,
0x13
,
0x62
,
0xA7
,
0x05
,
0xF3
,
0xC0
,
0xC7
,
0x73
,
0x8C
,
0x98
,
0x93
,
0x2B
,
0xD9
,
0xBC
,
0x4C
,
0x82
,
0xCA
,
0x1E
,
0x9B
,
0x57
,
0x3C
,
0xFD
,
0xD4
,
0xE0
,
0x16
,
0x67
,
0x42
,
0x6F
,
0x18
,
0x8A
,
0x17
,
0xE5
,
0x12
,
0xBE
,
0x4E
,
0xC4
,
0xD6
,
0xDA
,
0x9E
,
0xDE
,
0x49
,
0xA0
,
0xFB
,
0xF5
,
0x8E
,
0xBB
,
0x2F
,
0xEE
,
0x7A
,
0xA9
,
0x68
,
0x79
,
0x91
,
0x15
,
0xB2
,
0x07
,
0x3F
,
0x94
,
0xC2
,
0x10
,
0x89
,
0x0B
,
0x22
,
0x5F
,
0x21
,
0x80
,
0x7F
,
0x5D
,
0x9A
,
0x5A
,
0x90
,
0x32
,
0x27
,
0x35
,
0x3E
,
0xCC
,
0xE7
,
0xBF
,
0xF7
,
0x97
,
0x03
,
0xFF
,
0x19
,
0x30
,
0xB3
,
0x48
,
0xA5
,
0xB5
,
0xD1
,
0xD7
,
0x5E
,
0x92
,
0x2A
,
0xAC
,
0x56
,
0xAA
,
0xC6
,
0x4F
,
0xB8
,
0x38
,
0xD2
,
0x96
,
0xA4
,
0x7D
,
0xB6
,
0x76
,
0xFC
,
0x6B
,
0xE2
,
0x9C
,
0x74
,
0x04
,
0xF1
,
0x45
,
0x9D
,
0x70
,
0x59
,
0x64
,
0x71
,
0x87
,
0x20
,
0x86
,
0x5B
,
0xCF
,
0x65
,
0xE6
,
0x2D
,
0xA8
,
0x02
,
0x1B
,
0x60
,
0x25
,
0xAD
,
0xAE
,
0xB0
,
0xB9
,
0xF6
,
0x1C
,
0x46
,
0x61
,
0x69
,
0x34
,
0x40
,
0x7E
,
0x0F
,
0x55
,
0x47
,
0xA3
,
0x23
,
0xDD
,
0x51
,
0xAF
,
0x3A
,
0xC3
,
0x5C
,
0xF9
,
0xCE
,
0xBA
,
0xC5
,
0xEA
,
0x26
,
0x2C
,
0x53
,
0x0D
,
0x6E
,
0x85
,
0x28
,
0x84
,
0x09
,
0xD3
,
0xDF
,
0xCD
,
0xF4
,
0x41
,
0x81
,
0x4D
,
0x52
,
0x6A
,
0xDC
,
0x37
,
0xC8
,
0x6C
,
0xC1
,
0xAB
,
0xFA
,
0x24
,
0xE1
,
0x7B
,
0x08
,
0x0C
,
0xBD
,
0xB1
,
0x4A
,
0x78
,
0x88
,
0x95
,
0x8B
,
0xE3
,
0x63
,
0xE8
,
0x6D
,
0xE9
,
0xCB
,
0xD5
,
0xFE
,
0x3B
,
0x00
,
0x1D
,
0x39
,
0xF2
,
0xEF
,
0xB7
,
0x0E
,
0x66
,
0x58
,
0xD0
,
0xE4
,
0xA6
,
0x77
,
0x72
,
0xF8
,
0xEB
,
0x75
,
0x4B
,
0x0A
,
0x31
,
0x44
,
0x50
,
0xB4
,
0x8F
,
0xED
,
0x1F
,
0x1A
,
0xDB
,
0x99
,
0x8D
,
0x33
,
0x9F
,
0x11
,
0x83
,
0x14
};
static
void
permute
(
unsigned
char
*
X
,
const
unsigned
char
*
buf
)
{
int
i
,
j
;
unsigned
char
t
;
memcpy
(
X
+
16
,
buf
,
16
);
for
(
i
=
0
;
i
<
16
;
i
++
)
X
[
32
+
i
]
=
X
[
16
+
i
]
^
X
[
i
];
t
=
0
;
for
(
i
=
0
;
i
<
18
;
i
++
)
{
for
(
j
=
0
;
j
<
48
;
j
++
)
{
t
=
X
[
j
]
^
S
[
t
];
X
[
j
]
=
t
;
}
t
+=
i
;
}
}
static
unsigned
int
transform_blk
(
void
*
c
,
const
unsigned
char
*
data
)
{
MD2_CONTEXT
*
ctx
=
c
;
int
j
;
for
(
j
=
0
;
j
<
16
;
j
++
)
{
ctx
->
C
[
j
]
^=
S
[
data
[
j
]
^
ctx
->
L
];
ctx
->
L
=
ctx
->
C
[
j
];
}
permute
(
ctx
->
X
,
data
);
return
/* burn stack */
4
+
5
*
sizeof
(
void
*
);
}
static
unsigned
int
transform
(
void
*
c
,
const
unsigned
char
*
data
,
size_t
nblks
)
{
unsigned
int
burn
;
do
{
burn
=
transform_blk
(
c
,
data
);
data
+=
64
;
}
while
(
--
nblks
);
return
burn
;
}
static
void
md2_init
(
void
*
context
,
unsigned
int
flags
)
{
MD2_CONTEXT
*
ctx
=
context
;
(
void
)
flags
;
memset
(
ctx
,
0
,
sizeof
(
*
ctx
));
ctx
->
bctx
.
blocksize
=
16
;
ctx
->
bctx
.
bwrite
=
transform
;
}
static
void
md2_final
(
void
*
context
)
{
MD2_CONTEXT
*
hd
=
context
;
unsigned
int
burn
;
_gcry_md_block_write
(
hd
,
NULL
,
0
);
/* flush */
;
/* pad */
memset
(
hd
->
bctx
.
buf
+
hd
->
bctx
.
count
,
16
-
hd
->
bctx
.
count
,
16
-
hd
->
bctx
.
count
);
burn
=
transform_blk
(
hd
,
hd
->
bctx
.
buf
);
permute
(
hd
->
X
,
hd
->
C
);
}
static
byte
*
md2_read
(
void
*
context
)
{
MD2_CONTEXT
*
hd
=
(
MD2_CONTEXT
*
)
context
;
return
hd
->
X
;
}
static
byte
asn
[
18
]
=
/* Object ID is 1.2.840.113549.2.2 */
{
0x30
,
0x20
,
0x30
,
0x0c
,
0x06
,
0x08
,
0x2a
,
0x86
,
0x48
,
0x86
,
0xf7
,
0x0d
,
0x02
,
0x02
,
0x05
,
0x00
,
0x04
,
0x10
};
static
gcry_md_oid_spec_t
oid_spec_md2
[]
=
{
/* iso.member-body.us.rsadsi.digestAlgorithm.md2 */
{
"1.2.840.113549.2.2"
},
{
NULL
},
};
gcry_md_spec_t
_gcry_digest_spec_md2
=
{
GCRY_MD_MD2
,
{
0
,
0
},
"MD2"
,
asn
,
DIM
(
asn
),
oid_spec_md2
,
16
,
md2_init
,
_gcry_md_block_write
,
md2_final
,
md2_read
,
NULL
,
sizeof
(
MD2_CONTEXT
)
};
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Expires
Mon, Dec 23, 5:30 PM (2 h, 24 m)
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Storage Handle
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Attached To
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