[PATCH 12/41] serpent: Ad-hoc debugging facility
Ian Jackson
ijackson at chiark.greenend.org.uk
Thu Jul 25 18:40:38 BST 2013
Provide an ad-hoc debugging facility in serpent.c.
If the "#if 0" is changed to "#if 1", the key material, plaintext and
ciphertext of all Serpent operations is printed in hex to stderr.
We provide a new header file hexdebug.h to facilitate this. And we
use this new header file in the "#if 0" debugging in transform_setkey.
No functional change.
Signed-off-by: Ian Jackson <ijackson at chiark.greenend.org.uk>
---
hexdebug.h | 15 +++++++++++++++
serpent.c | 31 +++++++++++++++++++++++++++++++
transform.c | 5 ++---
3 files changed, 48 insertions(+), 3 deletions(-)
create mode 100644 hexdebug.h
diff --git a/hexdebug.h b/hexdebug.h
new file mode 100644
index 0000000..4139f72
--- /dev/null
+++ b/hexdebug.h
@@ -0,0 +1,15 @@
+#ifndef HEXDEBUG_H
+#define HEXDEBUG_H
+
+#include <stdio.h>
+#include <sys/types.h>
+
+static inline void hexdebug(FILE *file, const void *buffer, size_t len)
+{
+ const uint8_t *array=buffer;
+ size_t i;
+ for (i=0; i<len; i++)
+ fprintf(file,"%02x",array[i]);
+}
+
+#endif /*HEXDEBUG_H*/
diff --git a/serpent.c b/serpent.c
index 6407c57..7c58505 100644
--- a/serpent.c
+++ b/serpent.c
@@ -22,6 +22,7 @@
#include <stdint.h>
+#include "hexdebug.h"
#include "serpent.h"
#include "serpentsboxes.h"
@@ -41,6 +42,26 @@
#endif /* !defined(SERPENT_BIGENDIAN) */
+#if 0
+
+#include <stdio.h>
+
+static void SERP_DEBUG(const char *str1,
+ const void *ary, int sz,
+ const char *str2)
+{
+ fprintf(stderr,"%s",str1);
+ hexdebug(stderr,ary,sz);
+ fprintf(stderr,"%s",str2);
+}
+
+#else
+
+#define SERP_DEBUG(str1,aryv,sz,str2) /*empty*/
+
+#endif
+
+
static uint32_t serpent_get_32bit(const uint8_t *basep,
int lenbytes, int offset)
{
@@ -65,6 +86,8 @@ void SERPENT_DECORATE(makekey)(struct keyInstance *key, int keyLen,
uint32_t j;
uint32_t w[132],k[132];
+ SERP_DEBUG("SERPENT makekey ",keyMaterial,keyLen/8,"\n");
+
for(i=0; i<keyLen/32; i++)
w[i]=serpent_get_32bit(keyMaterial, keyLen/8, i*4);
if(keyLen<256)
@@ -125,6 +148,8 @@ void SERPENT_DECORATE(encrypt)(struct keyInstance *key,
register uint32_t x0, x1, x2, x3;
register uint32_t y0, y1, y2, y3;
+ SERP_DEBUG("SERPENT encrypt ",plaintext,16," ->");
+
x0=serpent_get_32bit(plaintext,16,+0);
x1=serpent_get_32bit(plaintext,16,+4);
x2=serpent_get_32bit(plaintext,16,+8);
@@ -234,6 +259,8 @@ void SERPENT_DECORATE(encrypt)(struct keyInstance *key,
serpent_put_32bit(ciphertext,16,+4, x1);
serpent_put_32bit(ciphertext,16,+8, x2);
serpent_put_32bit(ciphertext,16,12, x3);
+
+ SERP_DEBUG(" ",ciphertext,16,"\n");
}
void SERPENT_DECORATE(decrypt)(struct keyInstance *key,
@@ -243,6 +270,8 @@ void SERPENT_DECORATE(decrypt)(struct keyInstance *key,
register uint32_t x0, x1, x2, x3;
register uint32_t y0, y1, y2, y3;
+ SERP_DEBUG("SERPENT decrypt ",ciphertext,16," ->");
+
x0=serpent_get_32bit(ciphertext,16,+0);
x1=serpent_get_32bit(ciphertext,16,+4);
x2=serpent_get_32bit(ciphertext,16,+8);
@@ -352,4 +381,6 @@ void SERPENT_DECORATE(decrypt)(struct keyInstance *key,
serpent_put_32bit(plaintext,16,+4, x1);
serpent_put_32bit(plaintext,16,+8, x2);
serpent_put_32bit(plaintext,16,12, x3);
+
+ SERP_DEBUG(" ",plaintext,16,"\n");
}
diff --git a/transform.c b/transform.c
index a0665ad..281e667 100644
--- a/transform.c
+++ b/transform.c
@@ -13,6 +13,7 @@
#include "util.h"
#include "serpent.h"
#include "unaligned.h"
+#include "hexdebug.h"
/* Required key length in bytes */
#define REQUIRED_KEYLEN ((512+64+32)/8)
@@ -49,10 +50,8 @@ static bool_t transform_setkey(void *sst, uint8_t *key, int32_t keylen)
#if 0
{
- int i;
printf("Setting key to: ");
- for (i=0; i<keylen; i++)
- printf("%02x",key[i]);
+ hexdebug(stdout,key,keylen);
printf("\n");
}
#endif /* 0 */
--
1.7.2.5
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