1 files changed, 121 insertions, 0 deletions
diff --git a/sys/dev/randomdev/hash.c b/sys/dev/randomdev/hash.c
new file mode 100644
index 0000000..fd169c9
--- /dev/null
+++ b/sys/dev/randomdev/hash.c
@@ -0,0 +1,121 @@
+/*-
+ * Copyright (c) 2000 Mark R V Murray
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/queue.h>
+#include <sys/libkern.h>
+#include <sys/mbuf.h>
+#include <sys/random.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <crypto/blowfish/blowfish.h>
+
+#include <dev/randomdev/hash.h>
+#include <dev/randomdev/yarrow.h>
+
+/* initialise the hash by copying in some supplied data */
+void
+yarrow_hash_init(struct yarrowhash *context, void *data, size_t size)
+{
+	size_t count;
+
+	count = size > KEYSIZE ? KEYSIZE : size;
+	memset(context->hash, 0xff, KEYSIZE);
+	memcpy(context->hash, data, count);
+}
+
+/* Do a Davies-Meyer hash using a block cipher.
+ * H_0 = I
+ * H_i = E_M_i(H_i-1) ^ H_i-1
+ */
+void
+yarrow_hash_iterate(struct yarrowhash *context, void *data, size_t size)
+{
+	u_char keybuffer[KEYSIZE], temp[KEYSIZE];
+	size_t count;
+	int iteration, last, i;
+
+	iteration = 0;
+	last = 0;
+	for (;;) {
+		if (size <= KEYSIZE)
+			last = 1;
+		count = size > KEYSIZE ? KEYSIZE : size;
+		memcpy(keybuffer, &((u_char *)data)[iteration], count);
+		memset(&keybuffer[KEYSIZE - count], 0xff, count);
+		BF_set_key(&context->hashkey, count,
+			&((u_char *)data)[iteration]);
+		BF_cbc_encrypt(context->hash, temp, KEYSIZE, &context->hashkey,
+			context->ivec, BF_ENCRYPT);
+		for (i = 0; i < KEYSIZE; i++)
+			context->hash[i] ^= temp[i];
+		if (last)
+			break;
+		iteration += KEYSIZE;
+		size -= KEYSIZE;
+	}
+}
+
+/* Conclude by returning a pointer to the data */
+void
+yarrow_hash_finish(struct yarrowhash *context, void *buf)
+{
+	memcpy(buf, context->hash, sizeof(context->hash));
+}
+
+/* Initialise the encryption routine by setting up the key schedule */
+void
+yarrow_encrypt_init(struct yarrowkey *context, void *data, size_t size)
+{
+	size_t count;
+
+	count = size > KEYSIZE ? KEYSIZE : size;
+	BF_set_key(&context->key, size, data);
+}
+
+/* Encrypt the supplied data using the key schedule preset in the context */
+void
+yarrow_encrypt(struct yarrowkey *context, void *d_in, void *d_out, size_t size)
+{
+	size_t count;
+	int iteration, last;
+
+	last = 0;
+	for (iteration = 0;; iteration += KEYSIZE) {
+		if (size <= KEYSIZE)
+			last = 1;
+		count = size > KEYSIZE ? KEYSIZE : size;
+		BF_cbc_encrypt(&((u_char *)d_in)[iteration],
+			&((u_char *)d_out)[iteration], count, &context->key,
+			context->ivec, BF_ENCRYPT);
+		if (last)
+			break;
+		size -= KEYSIZE;
+	}
+}