dropbear: omac_process.c comparison

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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
+*/
+/* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */
+#include "mycrypt.h"
+#ifdef OMAC
+int omac_process(omac_state *state, const unsigned char *buf, unsigned long len)
+{
+int err, n, x;
+_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->blklen > (int)sizeof(state->block)) || (state->buflen > state->blklen)) {
+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->blklen) {
+for (x = 0; x < state->blklen; x++) {
+state->block[x] ^= state->prev[x];
+}
+cipher_descriptor[state->cipher_idx].ecb_encrypt(state->block, state->prev, &state->key);
+state->buflen = 0;
+}
+/* add bytes */
+n = MIN(len, (unsigned long)(state->blklen - state->buflen));
+memcpy(state->block + state->buflen, buf, n);
+state->buflen += n;
+len           -= n;
+buf           += n;
+}
+return CRYPT_OK;
+}
+#endif

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