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Add 64-bit integer utilities

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Greg Maxwell
2015-08-05 16:17:50 +02:00
committed by Andrew Poelstra
parent e34ceb333b
commit efc61dc0ca
5 changed files with 102 additions and 3 deletions
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19
src/testrand_impl.h
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@@ -1,5 +1,5 @@
/**********************************************************************
* Copyright (c) 2013-2015 Pieter Wuille *
* Copyright (c) 2013-2015 Pieter Wuille, Gregory Maxwell *
* Distributed under the MIT software license, see the accompanying *
* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
**********************************************************************/
@@ -107,4 +107,21 @@ static void secp256k1_rand256_test(unsigned char *b32) {
secp256k1_rand_bytes_test(b32, 32);
}
SECP256K1_INLINE static int64_t secp256k1_rands64(uint64_t min, uint64_t max) {
uint64_t range;
uint64_t r;
uint64_t clz;
VERIFY_CHECK(max >= min);
if (max == min) {
return min;
}
range = max - min;
clz = secp256k1_clz64_var(range);
do {
r = ((uint64_t)secp256k1_rand32() << 32) | secp256k1_rand32();
r >>= clz;
} while (r > range);
return min + (int64_t)r;
}
#endif /* SECP256K1_TESTRAND_IMPL_H */