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1 | /*
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2 | rand256.c
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3 |
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4 | Created: Oct 2000 by Philip Homburg <philip@f-mnx.phicoh.com>
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5 |
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6 | Generate 256-bit random numbers
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7 | */
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8 |
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9 | #include <sha2.h>
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10 | #include "inet.h"
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11 | #include "rand256.h"
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12 |
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13 | PRIVATE u32_t base_bits[8];
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14 |
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15 | PUBLIC void init_rand256(bits)
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16 | u8_t bits[32];
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17 | {
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18 | memcpy(base_bits, bits, sizeof(base_bits));
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19 | }
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20 |
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21 | PUBLIC void rand256(bits)
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22 | u8_t bits[32];
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23 | {
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24 | u32_t a;
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25 | SHA256_CTX ctx;
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26 |
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27 | a= ++base_bits[0];
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28 | if (a == 0)
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29 | base_bits[1]++;
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30 | SHA256_Init(&ctx);
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31 | SHA256_Update(&ctx, (unsigned char *)base_bits, sizeof(base_bits));
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32 | SHA256_Final(bits, &ctx);
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33 | }
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34 |
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35 | /*
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36 | * $PchId: rand256.c,v 1.1 2005/06/28 14:13:43 philip Exp $
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37 | */
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