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SOP/sop-sdk/sdk-go/common/SignUtil.go

99 lines
2.6 KiB

4 years ago
package common
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"sort"
"strings"
)
const (
PEM_BEGIN = "-----BEGIN RSA PRIVATE KEY-----\n"
PEM_END = "\n-----END RSA PRIVATE KEY-----"
)
func CreateSign(allParams map[string]string, privateKey string, signType string) string {
signContent := GetSignContent(allParams)
return Sign(signContent, privateKey, signType)
}
func Sign(signContent string, privateKey string, signType string) string {
if signType == "RSA" {
return RsaSign(signContent, privateKey, crypto.SHA1)
} else if signType == "RSA2" {
return RsaSign(signContent, privateKey, crypto.SHA256)
} else {
panic(errors.New("signType错误"))
}
}
func RsaSign(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 {
panic(err)
}
signature, err := rsa.SignPKCS1v15(rand.Reader, priKey, hash, hashed)
if err != nil {
panic(err)
}
return base64.StdEncoding.EncodeToString(signature)
}
func ParsePrivateKey(privateKey string)(*rsa.PrivateKey, error) {
privateKey = FormatPrivateKey(privateKey)
// 2、解码私钥字节,生成加密对象
block, _ := pem.Decode([]byte(privateKey))
if block == nil {
return nil, errors.New("私钥信息错误!")
}
// 3、解析DER编码的私钥,生成私钥对象
priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return priKey, nil
}
func FormatPrivateKey(privateKey string) string {
if !strings.HasPrefix(privateKey, PEM_BEGIN) {
privateKey = PEM_BEGIN + privateKey
}
if !strings.HasSuffix(privateKey, PEM_END) {
privateKey = privateKey + PEM_END
}
return privateKey
}
/**
1.筛选并排序
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
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
2.拼接
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
*/
func GetSignContent(allParams map[string]string) string {
keys := make([]string, 0, len(allParams))
var result []string
for k := range allParams {
keys = append(keys, k)
}
sort.Strings(keys)
for _, key := range keys {
val := allParams[key]
if len(val) > 0 {
result = append(result, key + "=" + val)
}
}
return strings.Join(result, "&")
}