--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pmac_process.c	Mon May 31 18:21:40 2004 +0000
@@ -0,0 +1,62 @@
+/* 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
+ */
+
+/* PMAC implementation by Tom St Denis */
+#include "mycrypt.h"
+
+#ifdef PMAC
+
+int pmac_process(pmac_state *state, const unsigned char *buf, unsigned long len)
+{
+   int err, n, x;
+   unsigned char Z[MAXBLOCKSIZE];
+
+   _ARGCHK(state != NULL);
+   _ARGCHK(buf   != NULL);
+   if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
+      return err;
+   }
+
+   if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
+       (state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   while (len != 0) { 
+       /* ok if the block is full we xor in prev, encrypt and replace prev */
+       if (state->buflen == state->block_len) {
+          pmac_shift_xor(state);
+          for (x = 0; x < state->block_len; x++) {
+              Z[x] = state->Li[x] ^ state->block[x];
+          }
+          cipher_descriptor[state->cipher_idx].ecb_encrypt(Z, Z, &state->key);
+          for (x = 0; x < state->block_len; x++) {
+              state->checksum[x] ^= Z[x];
+          }
+          state->buflen = 0;
+       }
+
+       /* add bytes */
+       n = MIN(len, (unsigned long)(state->block_len - state->buflen));
+       memcpy(state->block + state->buflen, buf, n);
+       state->buflen += n;
+       len           -= n;
+       buf           += n;
+   }
+
+#ifdef CLEAN_STACK
+   zeromem(Z, sizeof(Z));
+#endif
+
+   return CRYPT_OK;
+}
+
+#endif