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crypto: add btcec fallback for sign/recover without cgo (#3680)

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* vendor: add github.com/btcsuite/btcd/btcec

* crypto: add btcec fallback for sign/recover without cgo

This commit adds a non-cgo fallback implementation of secp256k1
operations.

* crypto, core/vm: remove wrappers for sha256, ripemd160
This commit is contained in:
Felix Lange
2017-02-18 09:24:12 +01:00
committed by Jeffrey Wilcke
parent bf21549faa
commit 9b0af51386
32 changed files with 3929 additions and 224 deletions
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10
crypto/secp256k1/secp256.go
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@ -42,17 +42,9 @@ import (
"unsafe"
)
var (
context *C.secp256k1_context
N *big.Int
HalfN *big.Int
)
var context *C.secp256k1_context
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_sign_verify()
C.secp256k1_context_set_illegal_callback(context, C.callbackFunc(C.secp256k1GoPanicIllegal), nil)