124 lines
3.2 KiB
Go
124 lines
3.2 KiB
Go
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package sm2util
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import (
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"encoding/hex"
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"errors"
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"math/big"
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"github.com/tjfoc/gmsm/sm2"
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)
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var (
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ErrPrivateKeyIsNil = errors.New("private key is nil")
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ErrPublicAndKeysNotMatch = errors.New("public and private keys don't match")
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)
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func CheckSm2KeyPair(priv *sm2.PrivateKey, pub *sm2.PublicKey) (pubHex string, err error) {
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if priv == nil {
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return "", ErrPrivateKeyIsNil
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}
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if pub == nil {
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pub = &priv.PublicKey
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return PublicKeyToHex(pub), nil
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}
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pubHex = PublicKeyToHex(pub)
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if pubHex != PublicKeyToHex(&priv.PublicKey) {
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return "", ErrPublicAndKeysNotMatch
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}
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return
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}
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/* From: https://github.com/tjfoc/gmsm/issues/207 */
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// 国密sm2 非对称加密算法 （对标rsa使用场景）
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//
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// ParsePublicKey 公钥字符串还原为 sm2.PublicKey 对象(与java中org.bouncycastle.crypto生成的公私钥完全互通使用)
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func ParsePublicKey(publicKeyStr string) (*sm2.PublicKey, error) {
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publicKeyBytes, err := hex.DecodeString(publicKeyStr)
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if err != nil {
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return nil, err
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}
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// 提取 x 和 y 坐标字节切片
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curve := sm2.P256Sm2().Params()
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byteLen := (curve.BitSize + 7) / 8
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xBytes := publicKeyBytes[1 : byteLen+1]
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yBytes := publicKeyBytes[byteLen+1 : 2*byteLen+1]
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// 将字节切片转换为大整数
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x := new(big.Int).SetBytes(xBytes)
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y := new(big.Int).SetBytes(yBytes)
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// 创建 sm2.PublicKey 对象
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publicKey := &sm2.PublicKey{
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Curve: curve,
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X: x,
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Y: y,
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}
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return publicKey, nil
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}
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// 国密 非对称加密算法
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//
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// ParsePublicKey 公钥字符串还原为 sm2.PublicKey 对象(与java中org.bouncycastle.crypto生成的公私钥完全互通使用)
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func ParsePublicKeyByXY(xHex, yHex string) (*sm2.PublicKey, error) {
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xBytes, err := hex.DecodeString(xHex)
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if err != nil {
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return nil, err
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}
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yBytes, err := hex.DecodeString(yHex)
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if err != nil {
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return nil, err
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}
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// 提取 x 和 y 坐标字节切片
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curve := sm2.P256Sm2().Params()
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// byteLen := (curve.BitSize + 7) / 8
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// 将字节切片转换为大整数
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x := new(big.Int).SetBytes(xBytes)
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y := new(big.Int).SetBytes(yBytes)
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// 创建 sm2.PublicKey 对象
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publicKey := &sm2.PublicKey{
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Curve: curve,
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X: x,
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Y: y,
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}
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return publicKey, nil
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}
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func PublicKeyToHex(pk *sm2.PublicKey) (pubKeyString string) {
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bs := append([]byte{byte(4)}, pk.X.Bytes()...)
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bs = append(bs, pk.Y.Bytes()...)
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return hex.EncodeToString(bs)
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}
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func PublicKeyToXYHex(pk *sm2.PublicKey) (x, y string) {
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x = hex.EncodeToString(pk.X.Bytes())
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y = hex.EncodeToString(pk.Y.Bytes())
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return x, y
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}
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// 将私钥字符串反序列化转为私钥对象:
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// ParsePrivateKey 私钥还原为 sm2.PrivateKey对象(与java中org.bouncycastle.crypto生成的公私钥完全互通使用)
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func ParsePrivateKey(privateKeyStr string, publicKey *sm2.PublicKey) (*sm2.PrivateKey, error) {
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privateKeyBytes, err := hex.DecodeString(privateKeyStr)
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if err != nil {
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return nil, err
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}
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// 将字节切片转换为大整数
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d := new(big.Int).SetBytes(privateKeyBytes)
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// 创建 sm2.PrivateKey 对象
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privateKey := &sm2.PrivateKey{
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PublicKey: *publicKey,
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D: d,
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}
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return privateKey, nil
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}
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func PrivateKeyToHex(pk *sm2.PrivateKey) (d string) {
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d = hex.EncodeToString(pk.D.Bytes())
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return d
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}
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/**/
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