dropbear: ocb_encrypt_authenticate

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--1:000000000000
+: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
+*/
+/* OCB Implementation by Tom St Denis */
+#include "mycrypt.h"
+#ifdef OCB_MODE
+int ocb_encrypt_authenticate_memory(int cipher,
+const unsigned char *key,    unsigned long keylen,
+const unsigned char *nonce,
+const unsigned char *pt,     unsigned long ptlen,
+unsigned char *ct,
+unsigned char *tag,    unsigned long *taglen)
+{
+int err;
+ocb_state ocb;
+_ARGCHK(key    != NULL);
+_ARGCHK(nonce  != NULL);
+_ARGCHK(pt     != NULL);
+_ARGCHK(ct     != NULL);
+_ARGCHK(tag    != NULL);
+_ARGCHK(taglen != NULL);
+if ((err = ocb_init(&ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
+return err;
+}
+while (ptlen > (unsigned long)ocb.block_len) {
+if ((err = ocb_encrypt(&ocb, pt, ct)) != CRYPT_OK) {
+return err;
+}
+ptlen   -= ocb.block_len;
+pt      += ocb.block_len;
+ct      += ocb.block_len;
+}
+return ocb_done_encrypt(&ocb, pt, ptlen, ct, tag, taglen);
+}
+#endif

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