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-rw-r--r--cipher/camellia-glue.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/cipher/camellia-glue.c b/cipher/camellia-glue.c
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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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+/* 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;
+}