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add chacha20 function

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This commit is contained in:
Andrew Poelstra
2018-04-03 22:06:07 +00:00
committed by Tim Ruffing
parent 3cdc02ef8a
commit a1f16a0a53
5 changed files with 309 additions and 0 deletions
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src/scalar_low_impl.h
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@@ -123,4 +123,9 @@ static SECP256K1_INLINE void secp256k1_scalar_cmov(secp256k1_scalar *r, const se
*r = (*r & mask0) | (*a & mask1);
}
SECP256K1_INLINE static void secp256k1_scalar_chacha20(secp256k1_scalar *r1, secp256k1_scalar *r2, const unsigned char *seed, uint64_t n) {
*r1 = (seed[0] + n) % EXHAUSTIVE_TEST_ORDER;
*r2 = (seed[1] + n) % EXHAUSTIVE_TEST_ORDER;
}
#endif /* SECP256K1_SCALAR_REPR_IMPL_H */