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99 lines
2.6 KiB
99 lines
2.6 KiB
4 years ago
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package common
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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"sort"
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"strings"
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)
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const (
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PEM_BEGIN = "-----BEGIN RSA PRIVATE KEY-----\n"
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PEM_END = "\n-----END RSA PRIVATE KEY-----"
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)
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func CreateSign(allParams map[string]string, privateKey string, signType string) string {
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signContent := GetSignContent(allParams)
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return Sign(signContent, privateKey, signType)
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}
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func Sign(signContent string, privateKey string, signType string) string {
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if signType == "RSA" {
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return RsaSign(signContent, privateKey, crypto.SHA1)
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} else if signType == "RSA2" {
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return RsaSign(signContent, privateKey, crypto.SHA256)
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} else {
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panic(errors.New("signType错误"))
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}
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}
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func RsaSign(signContent string, privateKey string, hash crypto.Hash) string {
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shaNew := hash.New()
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shaNew.Write([]byte(signContent))
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hashed := shaNew.Sum(nil)
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priKey, err := ParsePrivateKey(privateKey)
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if err != nil {
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panic(err)
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}
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signature, err := rsa.SignPKCS1v15(rand.Reader, priKey, hash, hashed)
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if err != nil {
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panic(err)
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}
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return base64.StdEncoding.EncodeToString(signature)
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}
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func ParsePrivateKey(privateKey string)(*rsa.PrivateKey, error) {
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privateKey = FormatPrivateKey(privateKey)
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// 2、解码私钥字节，生成加密对象
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block, _ := pem.Decode([]byte(privateKey))
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if block == nil {
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return nil, errors.New("私钥信息错误！")
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}
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// 3、解析DER编码的私钥，生成私钥对象
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priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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return nil, err
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}
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return priKey, nil
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}
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func FormatPrivateKey(privateKey string) string {
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if !strings.HasPrefix(privateKey, PEM_BEGIN) {
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privateKey = PEM_BEGIN + privateKey
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}
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if !strings.HasSuffix(privateKey, PEM_END) {
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privateKey = privateKey + PEM_END
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}
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return privateKey
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}
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/**
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1.筛选并排序
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获取所有请求参数，不包括字节类型参数，如文件、字节流，剔除sign字段，剔除值为空的参数，并按照参数名ASCII码递增排序（字母升序排序），
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如果遇到相同字符则按照第二个字符的键值ASCII码递增排序，以此类推。
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2.拼接
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将排序后的参数与其对应值，组合成“参数=参数值”的格式，并且把这些参数用&字符连接起来，此时生成的字符串为待签名字符串。
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*/
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func GetSignContent(allParams map[string]string) string {
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keys := make([]string, 0, len(allParams))
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var result []string
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for k := range allParams {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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for _, key := range keys {
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val := allParams[key]
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if len(val) > 0 {
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result = append(result, key + "=" + val)
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}
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}
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return strings.Join(result, "&")
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}
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