1 files changed, 112 insertions, 0 deletions
diff --git a/collect.c b/collect.c
new file mode 100644
index 0000000..e800edd
--- /dev/null
+++ b/collect.c
@@ -0,0 +1,112 @@
+/*
+ * Collect various pieces of randomness
+ */
+
+static char rcsid[] = "$Header: /home/sater/bridge/bigdeal/RCS/collect.c,v 1.7 2000/08/25 15:55:26 sater Exp $";
+
+#include "types.h"
+#include "rmd160.h"
+#include "bigdeal.h"
+#include <stdio.h>
+
+static dword MDbuf[RMDdwords];		/* Contains state of RIPEMD-160 */
+static byte variousbytes[64];
+static int vbytesindex;
+
+int nrandombits;			/* Collected bits of randomness */
+static int nhashbytes;			/* Number of bytes hashed */
+
+#ifdef BIGDEALX
+extern FILE *flog;
+#endif
+
+void
+collect_start()
+/*
+ * Set everything to zero, and init the hashing engine
+ */
+{
+
+	MDinit(MDbuf);
+	vbytesindex = 0;
+	nhashbytes = 0;
+	nrandombits = 0;
+}
+
+static void
+collect_byte(byte b)
+/*
+ * Throw another byte into the machine. If it fills up the buffer run the 
+ * buffer through the hashing engine
+ */
+{
+	dword X[16];
+	int i;
+	byte *bp;
+
+	nhashbytes++;
+	variousbytes[vbytesindex++] = b;
+	if (vbytesindex == 64) {
+		bp = variousbytes;
+		for (i=0; i<16; i++) {
+			X[i] = BYTES_TO_DWORD(bp);
+			bp += 4;
+		}
+		compress(MDbuf, X);
+		vbytesindex = 0;
+#ifdef BIGDEALX
+		if (flog)
+			fprintf(flog, "compressed another 64 bytes\n");
+#endif
+	}
+}
+
+void
+collect_more(byte *bp, int nbytes, int entropybits)
+/*
+ * Throw a bunch of information into the machine.
+ * The user supplies a hopefully pessimistic estimate of the entropy
+ */
+{
+
+	nrandombits += entropybits;
+#ifdef BIGDEALX
+	if (flog) {
+		int i;
+
+		fprintf(flog, "collect_more(");
+		for (i=0; i < nbytes; i++)
+			fprintf(flog, "%02x", bp[i]);
+		fprintf(flog, ", %d, %d) -> %d\n", nbytes, entropybits, nrandombits);
+	}
+#endif
+	while(nbytes > 0) {
+		collect_byte(*bp);
+		nbytes--;
+		bp++;
+	}
+}
+
+void
+collect_finish(byte *hash)
+/*
+ * Halt the hashing engine
+ * Extract the result into hash[]
+ */
+{
+	int i;
+
+	MDfinish(MDbuf, variousbytes, nhashbytes, 0);
+#ifdef BIGDEALX
+	if (flog)
+		fprintf(flog, "collected %d random bits, from %d bytes of data\n",
+			nrandombits, nhashbytes);
+
+#endif
+	for (i=0; i<RMDbytes; i+=4) {
+		hash[i]   =  MDbuf[i>>2];         /* implicit cast to byte  */
+		hash[i+1] = (MDbuf[i>>2] >>  8);  /*  extracts the 8 least  */
+		hash[i+2] = (MDbuf[i>>2] >> 16);  /*  significant bits.     */
+		hash[i+3] = (MDbuf[i>>2] >> 24);
+	}
+}