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Double aesrand_getword() performance by using full 128 bits #801

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merged 1 commit into from Mar 2, 2024
Merged

Double aesrand_getword() performance by using full 128 bits #801

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13 changes: 12 additions & 1 deletion src/aesrand.c
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Expand Up @@ -8,6 +8,7 @@

#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>

Expand All @@ -28,6 +29,7 @@ struct aesrand {
uint32_t input[AES_BLOCK_WORDS];
uint32_t sched[(AES_ROUNDS + 1) * 4];
uint8_t output[OUTPUT_BYTES];
bool remaining;
};

static aesrand_t *_aesrand_init(uint8_t *key)
Expand All @@ -38,6 +40,7 @@ static aesrand_t *_aesrand_init(uint8_t *key)
log_fatal("aesrand", "could not initialize AES key");
}
memset(aes->output, 0, OUTPUT_BYTES);
aes->remaining = false;
return aes;
}

Expand All @@ -62,10 +65,18 @@ aesrand_t *aesrand_init_from_random(void)

uint64_t aesrand_getword(aesrand_t *aes)
{
uint64_t retval;

if (aes->remaining) {
memcpy(&retval, &aes->output[sizeof(retval)], sizeof(retval));
aes->remaining = false;
return retval;
}

memcpy(aes->input, aes->output, sizeof(aes->input));
rijndaelEncrypt(aes->sched, AES_ROUNDS, (uint8_t *)aes->input,
aes->output);
uint64_t retval;
memcpy(&retval, aes->output, sizeof(retval));
aes->remaining = true;
return retval;
}