d48555b36a
git-subtree-dir: src/secp256k1 git-subtree-split: ad2028f9890ca40bdd32055aa0fe5c1c9af0e485
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/**********************************************************************
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* Copyright (c) 2013, 2014 Pieter Wuille *
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
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**********************************************************************/
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#ifndef _SECP256K1_TESTRAND_IMPL_H_
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#define _SECP256K1_TESTRAND_IMPL_H_
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#include <stdint.h>
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#include <string.h>
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#include "testrand.h"
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static uint32_t secp256k1_Rz = 11, secp256k1_Rw = 11;
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SECP256K1_INLINE static void secp256k1_rand_seed(uint64_t v) {
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secp256k1_Rz = v >> 32;
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secp256k1_Rw = v;
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if (secp256k1_Rz == 0 || secp256k1_Rz == 0x9068ffffU) {
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secp256k1_Rz = 111;
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}
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if (secp256k1_Rw == 0 || secp256k1_Rw == 0x464fffffU) {
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secp256k1_Rw = 111;
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}
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}
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SECP256K1_INLINE static uint32_t secp256k1_rand32(void) {
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secp256k1_Rz = 36969 * (secp256k1_Rz & 0xFFFF) + (secp256k1_Rz >> 16);
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secp256k1_Rw = 18000 * (secp256k1_Rw & 0xFFFF) + (secp256k1_Rw >> 16);
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return (secp256k1_Rw << 16) + (secp256k1_Rw >> 16) + secp256k1_Rz;
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}
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static void secp256k1_rand256(unsigned char *b32) {
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for (int i=0; i<8; i++) {
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uint32_t r = secp256k1_rand32();
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b32[i*4 + 0] = (r >> 0) & 0xFF;
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b32[i*4 + 1] = (r >> 8) & 0xFF;
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b32[i*4 + 2] = (r >> 16) & 0xFF;
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b32[i*4 + 3] = (r >> 24) & 0xFF;
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}
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}
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static void secp256k1_rand256_test(unsigned char *b32) {
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int bits=0;
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memset(b32, 0, 32);
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while (bits < 256) {
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uint32_t ent = secp256k1_rand32();
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int now = 1 + ((ent % 64)*((ent >> 6) % 32)+16)/31;
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uint32_t val = 1 & (ent >> 11);
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while (now > 0 && bits < 256) {
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b32[bits / 8] |= val << (bits % 8);
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now--;
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bits++;
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}
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}
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}
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#endif
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