golang实现RSA2的签名与验签函数

使用非对称加密算法，实现签名与验签

package tools

import (
    "crypto"
    "crypto/rand"
    "crypto/rsa"
    "crypto/sha256"
    "crypto/x509"
    "encoding/base64"
    "encoding/pem"
    "errors"
)

// RSA2私钥签名
func Rsa2PriSign(signContent string, privateKey string, hash crypto.Hash) string {
    shaNew := hash.New()
    shaNew.Write([]byte(signContent))
    hashed := shaNew.Sum(nil)
    priKey, err := ParsePrivateKey(privateKey)
    if err != nil {
        return ""
    }

    signature, err := rsa.SignPKCS1v15(rand.Reader, priKey, hash, hashed)
    if err != nil {
        return ""
    }
    return base64.StdEncoding.EncodeToString(signature)
}

// 解析私钥
func ParsePrivateKey(privateKey string) (*rsa.PrivateKey, error) {
    block, _ := pem.Decode([]byte(privateKey))
    if block == nil {
        return nil, errors.New("私钥信息错误！")
    }
    priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
    if err != nil {
        return nil, err
    }
    return priKey, nil
}

// RSA2公钥验证签名
func Rsa2PubCheckSign(signContent, sign, publicKey string, hash crypto.Hash) bool {
    hashed := sha256.Sum256([]byte(signContent))
    pubKey, err := ParsePublicKey(publicKey)
    if err != nil {
        return false
    }
    sig, _ := base64.StdEncoding.DecodeString(sign)
    err = rsa.VerifyPKCS1v15(pubKey, hash, hashed[:], sig)
    if err != nil {
        return false
    }
    return true
}

// 解析公钥
func ParsePublicKey(publicKey string) (*rsa.PublicKey, error) {
    block, _ := pem.Decode([]byte(publicKey))
    if block == nil {
        return nil, errors.New("公钥信息错误！")
    }
    pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
    if err != nil {
        return nil, err
    }
    return pubKey.(*rsa.PublicKey), nil
}

测试用例

package tools

import (
    "crypto"
    "log"
    "testing"
)

const (
    // 私钥
    PRIVATE_KEY = `
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
`
    // 私钥
    PUBLIC_KEY = `
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvSa9KsScy+ZuFTiPLE7Z
wMacmxmA6A8fu0jiPluliLwutgROTTZp3g9HmW1CuYt+ZoQH9t0JzHHNFu9yCetJ
dt5TrpQx9bBovTsh8h/ZQOPsyo0pnKqi5G3x1Azvbzs6yTU8voz6xVT90/DVJcd7
1osTsn+7ajEZccfa35tl5DBdF95thWeyMz5p6ayFMUEU10HBUYmYTUzi4dvXcZUZ
vLOIOPMHoCTXcX98EmGqUvsLWpx8mscaA5llZMg+ZXnT5OH+HW9ncfz7DqXiON3y
o1BrNPdmN+Y4SI9dWrADUzGJO6u58OwncCphUsYqnlG2jd4n0JhjpA2WGD4c6zqJ
JQIDAQAB
-----END PUBLIC KEY-----
`
)

func TestRsa2Rsa2PriSign(t *testing.T) {
    //原内容
    str := "F78691A5-2963-42D2-A0C7-3A4F31CF5EB6"
    //生成签名
    sig := Rsa2PriSign(str, PRIVATE_KEY, crypto.SHA256)
    log.Println(sig)
    //验证原内容与签名是否一致
    res := Rsa2PubCheckSign(str, sig, PUBLIC_KEY, crypto.SHA256)
    log.Println(res)
}

 验证成功！