diff options
Diffstat (limited to 'crypto/secp256k1/secp256.go')
| -rw-r--r-- | crypto/secp256k1/secp256.go | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/secp256k1/secp256.go b/crypto/secp256k1/secp256.go index 97b4bd8da..4999c5c95 100644 --- a/crypto/secp256k1/secp256.go +++ b/crypto/secp256k1/secp256.go @@ -58,10 +58,14 @@ import ( var ( context *C.secp256k1_context N *big.Int + HalfN *big.Int ) func init() { N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16) + // N / 2 == 57896044618658097711785492504343953926418782139537452191302581570759080747168 + HalfN, _ = new(big.Int).SetString("7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0", 16) + // around 20 ms on a modern CPU. context = C.secp256k1_context_create(3) // SECP256K1_START_SIGN | SECP256K1_START_VERIFY C.secp256k1_context_set_illegal_callback(context, C.callbackFunc(C.secp256k1GoPanicIllegal), nil) |