--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cfb_decrypt.c	Mon May 31 18:21:40 2004 +0000
@@ -0,0 +1,48 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtomcrypt.org
+ */
+#include "mycrypt.h"
+
+#ifdef CFB
+
+int cfb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CFB *cfb)
+{
+   int err;
+
+   _ARGCHK(pt != NULL);
+   _ARGCHK(ct != NULL);
+   _ARGCHK(cfb != NULL);
+
+   if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
+       return err;
+   }
+
+   /* is blocklen/padlen valid? */
+   if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
+       cfb->padlen   < 0 || cfb->padlen   > (int)sizeof(cfb->pad)) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   while (len-- > 0) {
+       if (cfb->padlen == cfb->blocklen) {
+          cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key);
+          cfb->padlen = 0;
+       }
+       cfb->pad[cfb->padlen] = *ct;
+       *pt = *ct ^ cfb->IV[cfb->padlen];
+       ++pt; 
+       ++ct;
+       ++cfb->padlen;
+   }
+   return CRYPT_OK;
+}
+
+#endif
+