frost/secp256k1-zkp
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add chacha20 function

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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.h
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@@ -117,4 +117,7 @@ static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r, const secp256k1_
/** If flag is true, set *r equal to *a; otherwise leave it. Constant-time. Both *r and *a must be initialized.*/
static void secp256k1_scalar_cmov(secp256k1_scalar *r, const secp256k1_scalar *a, int flag);
/** Generate two scalars from a 32-byte seed and an integer using the chacha20 stream cipher */
static void secp256k1_scalar_chacha20(secp256k1_scalar *r1, secp256k1_scalar *r2, const unsigned char *seed, uint64_t idx);
#endif /* SECP256K1_SCALAR_H */