--- /dev/null
+/* 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.
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ofb_start.c
+ OFB implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef LTC_OFB_MODE
+
+/**
+ Initialize a OFB context
+ @param cipher The index of the cipher desired
+ @param IV The initialization vector
+ @param key The secret key
+ @param keylen The length of the secret key (octets)
+ @param num_rounds Number of rounds in the cipher desired (0 for default)
+ @param ofb The OFB state to initialize
+ @return CRYPT_OK if successful
+*/
+int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
+ int keylen, int num_rounds, symmetric_OFB *ofb)
+{
+ int x, err;
+
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(key != NULL);
+ LTC_ARGCHK(ofb != NULL);
+
+ if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* copy details */
+ ofb->cipher = cipher;
+ ofb->blocklen = cipher_descriptor[cipher].block_length;
+ for (x = 0; x < ofb->blocklen; x++) {
+ ofb->IV[x] = IV[x];
+ }
+
+ /* init the cipher */
+ ofb->padlen = ofb->blocklen;
+ return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key);
+}
+
+#endif
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */