+SHACAL-[1,2]

[avr-crypto-lib.git] / shacal1_enc.c

diff --git a/shacal1_enc.c b/shacal1_enc.c
new file mode 100644 (file)
index 0000000..82fb722
--- /dev/null
+++ b/shacal1_enc.c
@@ -0,0 +1,36 @@
+/**
+ * \file       shacal1_enc.c
+ * \author     Daniel Otte
+ * \date       2008-05-06
+ * \par License:
+ * GPL
+ * \brief SHACAL1 encryption only implementation.
+ * 
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "sha1.h"
+#include "shacal1_enc.h"
+
+void shacal1_enc(void* buffer, void* key, uint16_t keysize_b){
+       sha1_ctx_t ctx, t_ctx;
+       uint8_t i;
+       memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
+       
+       uint8_t keybuffer[SHA1_BLOCK_BITS/8];
+       memset(keybuffer, 0, SHA1_BLOCK_BITS/8);
+       if(keysize_b>SHA1_BLOCK_BITS)
+               keysize_b=SHA1_BLOCK_BITS;
+       memcpy(keybuffer, key, (keysize_b+7)/8);
+       
+       memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
+       sha1_ctx2hash((sha1_hash_t*)(&(ctx.h[0])), &t_ctx);
+       memcpy(t_ctx.h, ctx.h, SHA1_HASH_BITS/8);
+       sha1_nextBlock(&ctx, keybuffer);
+       for(i=0; i<5; ++i)
+               ctx.h[i] -= t_ctx.h[i];
+       sha1_ctx2hash(buffer, &ctx);
+}
+
+