Changeset 4672:c4e84aa74620 in roaraudio

Timestamp:

12/20/10 18:23:56 (13 years ago)

Author:

phi

Branch:

default

Phase:

public

Message:

added function to generate nonce

Files:

• include/libroar/random.h (modified) (1 diff)
• libroar/random.c (modified) (1 diff)

include/libroar/random.h

@@ -46 +46 @@
 #define ROAR_RANDOM_VERY_STRONG  5
 
+int roar_random_gen_nonce(void * buffer, size_t len);
+
 int roar_random_gen(void * buffer, size_t len, int quality);
 

libroar/random.c

@@ -50 +50 @@
 
  inited = 1;
+}
+
+#define TIGER_BLOCKLEN  55
+#define TIGER_DIGESTLEN (3*8)
+
+int roar_random_gen_nonce(void * buffer, size_t len) {
+ static uint32_t buf[14];
+ static int inited = 0;
+ static int idx = 0;
+ volatile pid_t pid = getpid();
+ size_t i, writelen;
+ void * off = buf;
+
+ roar_random_init();
+
+ if ( !inited ) {
+  for (i = 0; i < (sizeof(buf)/sizeof(*buf)); i++) {
+#ifdef ROAR_HAVE_RAND
+   buf[i] = rand() + pid;
+#else
+   buf[i] = pid;
+#endif
+  }
+
+  roar_hash_buffer(off,                 buf, TIGER_BLOCKLEN, ROAR_HT_TIGER);
+  roar_hash_buffer(off+TIGER_DIGESTLEN, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER);
+
+  inited = 1;
+ }
+
+ while (len) {
+
+#ifdef ROAR_HAVE_TIME
+  buf[12] += time(NULL);
+#endif
+
+#ifdef ROAR_HAVE_RAND
+  buf[12] += rand();
+#endif
+
+  buf[12] += pid;
+  buf[13] += pid;
+
+  off = buf;
+  if ( idx ) {
+   off += TIGER_DIGESTLEN;
+   idx  = 0;
+  } else {
+   idx  = 1;
+  }
+
+  roar_hash_buffer(off, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER);
+
+  writelen = len >= TIGER_DIGESTLEN ? TIGER_DIGESTLEN : len;
+  memcpy(buffer, off, writelen);
+
+  buffer += writelen;
+  len    -= writelen;
+ }
+
+ return 0;
 }