github.com/fisco-bcos/crypto@v0.0.0-20200202032121-bd8ab0b5d4f1/elliptic/secp256k1.go (about)

     1  package elliptic
     2  
     3  import (
     4  	"math/big"
     5  )
     6  
     7  var secp256k1 *CurveParams
     8  
     9  func initSecp256k1() {
    10  	secp256k1 = &CurveParams{Name: "secp256k1"}
    11  	secp256k1.P, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f", 16)
    12  	secp256k1.N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
    13  	secp256k1.A = new(big.Int)
    14  	secp256k1.B = new(big.Int).SetInt64(7)
    15  	secp256k1.Gx, _ = new(big.Int).SetString("79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798", 16)
    16  	secp256k1.Gy, _ = new(big.Int).SetString("483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8", 16)
    17  	secp256k1.BitSize = 256
    18  }
    19  
    20  // Secp256k1 returns a Curve which implements secp256k1 (see SEC 2, section 2.4.1)
    21  //
    22  // The cryptographic operations do not use constant-time algorithms.
    23  func Secp256k1() Curve {
    24  	initonce.Do(initAll)
    25  	return secp256k1
    26  }