58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* ZMap Copyright 2013 Regents of the University of Michigan
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <assert.h>
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#include <string.h>
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#include "../lib/rijndael-alg-fst.h"
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#include "../lib/random.h"
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#include "../lib/logger.h"
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#define AES_ROUNDS 10
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#define AES_BLOCK_WORDS 4
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#define AES_KEY_BYTES 16
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#define OUTPUT_BYTES 16
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static uint32_t aes_input[AES_BLOCK_WORDS];
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static uint32_t aes_sched[(AES_ROUNDS+1)*4];
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static uint8_t aes_output[OUTPUT_BYTES];
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static int init = 0;
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void aesrand_init(uint32_t seed)
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{
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memset(&aes_input, 0, sizeof(aes_input));
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uint8_t key[AES_KEY_BYTES];
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if (seed) {
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memset(key, 0, AES_KEY_BYTES*sizeof(uint8_t));
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memcpy(key, &seed, sizeof(uint32_t));
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} else {
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if (!random_bytes(key, AES_KEY_BYTES)) {
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log_fatal("aesrand", "couldn't get random bytes");
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}
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}
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if (rijndaelKeySetupEnc(aes_sched, key, AES_KEY_BYTES*8) != AES_ROUNDS) {
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log_fatal("aesrand", "could not initialize AES key");
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}
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memset(aes_output, 0, OUTPUT_BYTES*sizeof(uint8_t));
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init = 1;
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}
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uint64_t aesrand_getword(void)
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{
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assert(init);
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memcpy(aes_input, aes_output, sizeof(aes_input));
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rijndaelEncrypt(aes_sched, AES_ROUNDS,
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(uint8_t *)aes_input, aes_output);
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uint64_t retval;
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memcpy(&retval, aes_output, sizeof(retval));
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return retval;
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}
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