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/* camellia-glue.c - Glue for the Camellia cipher
* Copyright (C) 2007 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GNUPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/* I put the GnuPG-specific stuff in this file to keep the
camellia.c/camellia.h files exactly as provided by NTT. If they
update their code, this should make it easier to bring the changes
in. - dshaw */
#include <config.h>
#include <sys/types.h>
#include <string.h>
#include "types.h"
#include "cipher.h"
#include "algorithms.h"
#include "util.h"
#include "errors.h"
#include "camellia.h"
typedef struct
{
int keybitlength;
KEY_TABLE_TYPE keytable;
} CAMELLIA_context;
static const char *selftest(void);
static void
burn_stack(int bytes)
{
char buf[128];
wipememory(buf,sizeof buf);
bytes -= sizeof buf;
if (bytes > 0)
burn_stack (bytes);
}
static int
camellia_setkey(void *c, const byte *key, unsigned keylen)
{
CAMELLIA_context *ctx=c;
static int initialized=0;
static const char *selftest_failed=NULL;
if(keylen!=32)
return G10ERR_WRONG_KEYLEN;
if(!initialized)
{
initialized=1;
selftest_failed=selftest();
if(selftest_failed)
log_error("%s\n",selftest_failed);
}
if(selftest_failed)
return G10ERR_SELFTEST_FAILED;
ctx->keybitlength=keylen*8;
Camellia_Ekeygen(ctx->keybitlength,key,ctx->keytable);
burn_stack
((19+34+34)*sizeof(u32)+2*sizeof(void*) /* camellia_setup256 */
+(4+32)*sizeof(u32)+2*sizeof(void*) /* camellia_setup192 */
+0+sizeof(int)+2*sizeof(void*) /* Camellia_Ekeygen */
+3*2*sizeof(void*) /* Function calls. */
);
return 0;
}
static void
camellia_encrypt(void *c, byte *outbuf, const byte *inbuf)
{
CAMELLIA_context *ctx=c;
Camellia_EncryptBlock(ctx->keybitlength,inbuf,ctx->keytable,outbuf);
burn_stack
(sizeof(int)+2*sizeof(unsigned char *)+sizeof(KEY_TABLE_TYPE)
+4*sizeof(u32)
+2*sizeof(u32*)+4*sizeof(u32)
+2*2*sizeof(void*) /* Function calls. */
);
}
static void
camellia_decrypt(void *c, byte *outbuf, const byte *inbuf)
{
CAMELLIA_context *ctx=c;
Camellia_DecryptBlock(ctx->keybitlength,inbuf,ctx->keytable,outbuf);
burn_stack
(sizeof(int)+2*sizeof(unsigned char *)+sizeof(KEY_TABLE_TYPE)
+4*sizeof(u32)
+2*sizeof(u32*)+4*sizeof(u32)
+2*2*sizeof(void*) /* Function calls. */
);
}
static const char *
selftest(void)
{
CAMELLIA_context ctx;
byte scratch[16];
/* These test vectors are from RFC-3713 */
const byte plaintext[]=
{
0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10
};
const byte key_256[]=
{
0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,
0x98,0x76,0x54,0x32,0x10,0x00,0x11,0x22,0x33,0x44,0x55,
0x66,0x77,0x88,0x99,0xaa,0xbb,0xcc,0xdd,0xee,0xff
};
const byte ciphertext_256[]=
{
0x9a,0xcc,0x23,0x7d,0xff,0x16,0xd7,0x6c,
0x20,0xef,0x7c,0x91,0x9e,0x3a,0x75,0x09
};
camellia_setkey(&ctx,key_256,sizeof(key_256));
camellia_encrypt(&ctx,scratch,plaintext);
if(memcmp(scratch,ciphertext_256,sizeof(ciphertext_256))!=0)
return "CAMELLIA-256 test encryption failed.";
camellia_decrypt(&ctx,scratch,scratch);
if(memcmp(scratch,plaintext,sizeof(plaintext))!=0)
return "CAMELLIA-256 test decryption failed.";
return NULL;
}
const char *
camellia_get_info(int algo, size_t *keylen,
size_t *blocksize, size_t *contextsize,
int (**r_setkey)(void *c, const byte *key, unsigned keylen),
void (**r_encrypt)(void *c, byte *outbuf, const byte *inbuf),
void (**r_decrypt)(void *c, byte *outbuf, const byte *inbuf)
)
{
*keylen = 256;
*blocksize = CAMELLIA_BLOCK_SIZE;
*contextsize = sizeof (CAMELLIA_context);
*r_setkey = camellia_setkey;
*r_encrypt = camellia_encrypt;
*r_decrypt = camellia_decrypt;
if(algo==CIPHER_ALGO_CAMELLIA)
return "CAMELLIA";
return NULL;
}
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