20060303a

1 files changed, 48 insertions, 0 deletions

diff --git a/libsec/port/desECB.c b/libsec/port/desECB.c
new file mode 100644
index 00000000..a9ad0018
--- /dev/null
+++ b/libsec/port/desECB.c
@@ -0,0 +1,48 @@
+#include "os.h"
+#include <mp.h>
+#include <libsec.h>
+
+// I wasn't sure what to do when the buffer was not
+// a multiple of 8.  I did what lacy's cryptolib did
+// to be compatible, but it looks dangerous to me
+// since its encrypting plain text with the key. -- presotto
+
+void
+desECBencrypt(uchar *p, int len, DESstate *s)
+{
+	int i;
+	uchar tmp[8];
+
+	for(; len >= 8; len -= 8){
+		block_cipher(s->expanded, p, 0);
+		p += 8;
+	}
+	
+	if(len > 0){
+		for (i=0; i<8; i++)
+			tmp[i] = i;
+		block_cipher(s->expanded, tmp, 0);
+		for (i = 0; i < len; i++)
+			p[i] ^= tmp[i];
+	}
+}
+
+void
+desECBdecrypt(uchar *p, int len, DESstate *s)
+{
+	int i;
+	uchar tmp[8];
+
+	for(; len >= 8; len -= 8){
+		block_cipher(s->expanded, p, 1);
+		p += 8;
+	}
+	
+	if(len > 0){
+		for (i=0; i<8; i++)
+			tmp[i] = i;
+		block_cipher(s->expanded, tmp, 0);
+		for (i = 0; i < len; i++)
+			p[i] ^= tmp[i];
+	}
+}