--- /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 xcbc_process.c
+ XCBC Support, process blocks with XCBC
+*/
+
+#ifdef LTC_XCBC
+
+/** Process data through XCBC-MAC
+ @param xcbc The XCBC-MAC state
+ @param in Input data to process
+ @param inlen Length of input in octets
+ Return CRYPT_OK on success
+*/
+int xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen)
+{
+ int err;
+#ifdef LTC_FAST
+ int x;
+#endif
+
+ LTC_ARGCHK(xcbc != NULL);
+ LTC_ARGCHK(in != NULL);
+
+ /* check structure */
+ if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
+ (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
+ return CRYPT_INVALID_ARG;
+ }
+
+#ifdef LTC_FAST
+ if (xcbc->buflen == 0) {
+ while (inlen > (unsigned long)xcbc->blocksize) {
+ for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) {
+ *(LTC_FAST_TYPE_PTR_CAST(&(xcbc->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(in[x])));
+ }
+ cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
+ in += xcbc->blocksize;
+ inlen -= xcbc->blocksize;
+ }
+ }
+#endif
+
+ while (inlen) {
+ if (xcbc->buflen == xcbc->blocksize) {
+ cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
+ xcbc->buflen = 0;
+ }
+ xcbc->IV[xcbc->buflen++] ^= *in++;
+ --inlen;
+ }
+ return CRYPT_OK;
+}
+
+#endif
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */
+