yaole
91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
package sm2
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import (
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"crypto/elliptic"
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"math/big"
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"xdx.jelly/xgcl/gmath"
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"xdx.jelly/xgcl/internal/kdf"
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"xdx.jelly/xgcl/sm/sm2/ec256"
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)
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const (
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// ECCRefMaxBits c.f. GMT 0018
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ECCRefMaxBits = 512
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// ECCRefMaxLen c.f. GMT 0018
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ECCRefMaxLen = (ECCRefMaxBits + 7) >> 3
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// ECCStrict UnmarshalBinary的时候是否要求数据严格遵循GMT0018格式, 也就是要求
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// bits按大端存储，并且等于密钥长度即256
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ECCStrict = false
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)
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var one = new(big.Int).SetInt64(1)
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var (
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sm2Curve elliptic.Curve
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// byteSize is the Bytes of prime, module...
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byteSize int
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// orderN the order of Group of points on the curve
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orderN *big.Int
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// byteOfN is the ByteSize - long of N of byte slice
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byteOfN []byte
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// nMinusOne N-1
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nMinusOne *big.Int
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// Curve256 export the curve param.
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Curve256 = ec256.Curve256
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)
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func init() {
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// Choose the curve
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// if the curve changed to a 384-bits curve,
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// just sm2Curve = ec.EC384()
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sm2Curve = ec256.CurveSM2()
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byteSize = (sm2Curve.Params().BitSize + 7) / 8
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orderN = new(big.Int).Set(sm2Curve.Params().N)
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byteOfN = gmath.BigIntToNByte(orderN, byteSize)
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nMinusOne = new(big.Int).Sub(orderN, gmath.BigInt1)
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// must after sm2Curve and byteSize
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initPrecompute()
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// for key exchange constants
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initKeyExchange()
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}
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// ByteSize 返回SM2的密钥大小
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func ByteSize() int {
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return byteSize
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}
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// OrderN return the order of point group
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func OrderN() *big.Int {
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return orderN
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}
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// Curve return the sm2 curve (interface)
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func Curve() elliptic.Curve {
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return sm2Curve
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}
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// Prime return the p of field charactor
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func Prime() *big.Int {
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return sm2Curve.Params().P
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}
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// BaseX return the x of base point
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func BaseX() *big.Int {
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return sm2Curve.Params().Gx
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}
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// BaseY return the y of base point
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func BaseY() *big.Int {
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return sm2Curve.Params().Gy
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}
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var Kdf = kdf.SMKDF.Kdf
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