dropbear: ofb_encrypt.c comparison

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+:7faae8f46238
+/* 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 OFB
+int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb)
+{
+int err;
+_ARGCHK(pt != NULL);
+_ARGCHK(ct != NULL);
+_ARGCHK(ofb != NULL);
+if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
+return err;
+}
+/* is blocklen/padlen valid? */
+if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) ||
+ofb->padlen   < 0 || ofb->padlen   > (int)sizeof(ofb->IV)) {
+return CRYPT_INVALID_ARG;
+}
+while (len-- > 0) {
+if (ofb->padlen == ofb->blocklen) {
+cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key);
+ofb->padlen = 0;
+}
+*ct++ = *pt++ ^ ofb->IV[ofb->padlen++];
+}
+return CRYPT_OK;
+}
+#endif

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