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| author | Gustav Simonsson <gustav.simonsson@gmail.com> | 2015-11-27 22:40:29 +0800 |
|---|---|---|
| committer | Jeffrey Wilcke <geffobscura@gmail.com> | 2016-02-18 17:08:11 +0800 |
| commit | 371871d685d54b916aef28de689d6f0af7822083 (patch) | |
| tree | e704b02ba2ffd2d1164001885fba15106b0f7d94 /crypto/secp256k1/secp256.go | |
| parent | aa36a6ae4f24f07e2c470a21c93ff37ad5861982 (diff) | |
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parmas, crypto, core, core/vm: homestead consensus protocol changes
* change gas cost for contract creating txs
* invalidate signature with s value greater than secp256k1 N / 2
* OOG contract creation if not enough gas to store code
* new difficulty adjustment algorithm
* new DELEGATECALL op code
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) |