From 341fcb5192bf89436681566074087a4b25bafadb Mon Sep 17 00:00:00 2001
From: Pekka Riikonen <priikone@silcnet.org>
Date: Sat, 21 Jul 2007 12:57:12 +0000
Subject: [PATCH] 	Added silc_hex2data and silc_data2hex.

---
 lib/silcutil/silcutil.c               | 58 +++++++++++++++++++++++++++
 lib/silcutil/silcutil.h               | 32 +++++++++++++++
 lib/silcutil/tests/test_silcstrutil.c | 16 +++++++-
 3 files changed, 104 insertions(+), 2 deletions(-)

diff --git a/lib/silcutil/silcutil.c b/lib/silcutil/silcutil.c
index 5cd09db0..0333e630 100644
--- a/lib/silcutil/silcutil.c
+++ b/lib/silcutil/silcutil.c
@@ -630,3 +630,61 @@ void silc_hexdump(const unsigned char *data, SilcUInt32 data_len,
       break;
   }
 }
+
+/* Convert hex string to data.  Each hex number must have two characters. */
+
+SilcBool silc_hex2data(const char *hex, unsigned char *data,
+		       SilcUInt32 data_size, SilcUInt32 *ret_data_len)
+{
+  char *cp = (char *)hex;
+  unsigned char l, h;
+  int i;
+
+  if (data_size < strlen(hex) / 2)
+    return FALSE;
+
+  for (i = 0; i < strlen(hex) / 2; i++) {
+    h = *cp++;
+    l = *cp++;
+
+    h -= h < 'A' ? '0' : 'A' - 10;
+    l -= l < 'A' ? '0' : 'A' - 10;
+
+    data[i] = (h << 4) | (l & 0xf);
+  }
+
+  if (ret_data_len)
+    *ret_data_len = i;
+
+  SILC_LOG_HEXDUMP(("len %d", i), data, i);
+
+  return TRUE;
+}
+
+/* Converts binary data to HEX string */
+
+SilcBool silc_data2hex(const unsigned char *data, SilcUInt32 data_len,
+		       char *hex, SilcUInt32 hex_size)
+{
+  unsigned char l, h;
+  char *cp = hex;
+  int i;
+
+  if (hex_size - 1 < data_len * 2)
+    return FALSE;
+
+  memset(hex, 0, hex_size);
+
+  for (i = 0; i < data_len; i++) {
+    l = data[i];
+    h = l >> 4;
+    l &= 0xf;
+
+    *cp++ = h + (h > 9 ? 'A' - 10 : '0');
+    *cp++ = l + (l > 9 ? 'A' - 10 : '0');
+  }
+
+  SILC_LOG_DEBUG(("HEX string: '%s'", hex));
+
+  return TRUE;
+}
diff --git a/lib/silcutil/silcutil.h b/lib/silcutil/silcutil.h
index c6b0d43f..300c0a43 100644
--- a/lib/silcutil/silcutil.h
+++ b/lib/silcutil/silcutil.h
@@ -449,4 +449,36 @@ char *silc_get_real_name();
 void silc_hexdump(const unsigned char *data, SilcUInt32 data_len,
 		  FILE *output);
 
+/****f* silcutil/SilcUtilAPI/silc_hex2data
+ *
+ * SYNOPSIS
+ *
+ *    SilcBool silc_hex2data(const char *hex, unsigned char *data,
+ *                           SilcUInt32 data_size, SilcUInt32 *ret_data_len);
+ *
+ * DESCRIPTION
+ *
+ *    Converts HEX character string to binary data.  Each HEX numbers must
+ *    have two characters in the `hex' string.
+ *
+ ***/
+SilcBool silc_hex2data(const char *hex, unsigned char *data,
+		       SilcUInt32 data_size, SilcUInt32 *ret_data_len);
+
+/****f* silcutil/SilcUtilAPI/silc_data2hex
+ *
+ * SYNOPSIS
+ *
+ *    SilcBool silc_data2hex(const unsigned char *data, SilcUInt32 data_len,
+ *                           char *hex, SilcUInt32 hex_size);
+ *
+ * DESCRIPTION
+ *
+ *    Converts binary data to HEX string.  This NULL terminates the `hex'
+ *    buffer automatically.
+ *
+ ***/
+SilcBool silc_data2hex(const unsigned char *data, SilcUInt32 data_len,
+		       char *hex, SilcUInt32 hex_size);
+
 #endif	/* !SILCUTIL_H */
diff --git a/lib/silcutil/tests/test_silcstrutil.c b/lib/silcutil/tests/test_silcstrutil.c
index 0673199e..d8bef756 100644
--- a/lib/silcutil/tests/test_silcstrutil.c
+++ b/lib/silcutil/tests/test_silcstrutil.c
@@ -53,9 +53,12 @@ int main(int argc, char **argv)
 {
   SilcBool success = FALSE;
   unsigned char *s1, *s2, *s3, *s4;
-  int l, opt;
+  unsigned char t[16];
+  char h[32 + 1];
+  int l, opt, i;
+  SilcUInt32 len;
 
-  while ((opt = getopt(argc, argv, "hVd")) != EOF) {
+  while ((opt = getopt(argc, argv, "hVd:")) != EOF) {
       switch(opt) {
         case 'h':
           printf("usage: test_silcstrutil\n");
@@ -162,6 +165,15 @@ int main(int argc, char **argv)
     goto err;
   SILC_LOG_DEBUG(("Regex not found (Ok)"));
 
+  /* HEX to data, data to HEX tests */
+  for (i = 0; i < sizeof(t); i++)
+    t[i] = i;
+  silc_data2hex(t, sizeof(t), h, sizeof(h));
+  silc_hex2data(h, t, sizeof(t), &len);
+  silc_snprintf(h, sizeof(h), "010203ffabdef9ab");
+  silc_hex2data(h, t, sizeof(t), &len);
+  silc_data2hex(t, sizeof(t), h, sizeof(h));
+
   success = TRUE;
 
  err:
-- 
2.24.0