From 7e12e96ec6601dd5f20f498e38126499c99f8705 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Sun, 9 Sep 2001 00:26:37 +0200
Subject: [PATCH] * des.c (des_fix_parity): New function.
Rev: src/nettle/des.c:1.4
Rev: src/nettle/des.h:1.6
---
des.c | 9 +++++++++
des.h | 30 +++++++++++++++++++++++++++++-
2 files changed, 38 insertions(+), 1 deletion(-)
diff --git a/des.c b/des.c
index c95f08b6..28f4f503 100644
--- a/des.c
+++ b/des.c
@@ -52,6 +52,15 @@ static char parity[] = {
#include "parity.h"
};
+void
+des_fix_parity(unsigned length, uint8_t *dst,
+ const uint8_t *src)
+{
+ unsigned i;
+ for (i = 0; i<length; i++)
+ dst[i] = src[i] ^ (parity[src[i]] == 8);
+}
+
int
des_set_key(struct des_ctx *ctx, const uint8_t *key)
{
diff --git a/des.h b/des.h
index 51d65f02..9903f034 100644
--- a/des.h
+++ b/des.h
@@ -1,6 +1,6 @@
/* des.h
*
- * The des block cipher.
+ * The des block cipher. And triple des.
*/
/* nettle, low-level cryptographics library
@@ -65,4 +65,32 @@ des_decrypt(struct des_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
+void
+des_fix_parity(unsigned length, uint8_t *dst,
+ const uint8_t *src);
+
+#define DES3_KEY_SIZE 24
+#define DES3_BLOCK_SIZE DES_BLOCK_SIZE
+
+struct des3_ctx
+{
+ struct des_ctx des[3];
+ enum des_error status;
+};
+
+
+/* On success, returns 1 and sets ctx->status to DES_OK (zero). On
+ * error, returns 0 and sets ctx->status accordingly. */
+int
+des3_set_key(struct des3_ctx *ctx, const uint8_t *key);
+
+void
+des3_encrypt(struct des3_ctx *ctx,
+ unsigned length, uint8_t *dst,
+ const uint8_t *src);
+void
+des3_decrypt(struct des3_ctx *ctx,
+ unsigned length, uint8_t *dst,
+ const uint8_t *src);
+
#endif /* NETTLE_DES_H_INCLUDED */
--
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