處理微信支付退款結果通知時，需要對傳回資料進行AES-256-ECB解密，golang标準庫未支援AES ECB加解密，特此記錄。
一、解密方式
解密步驟如下
對加密串A做base64解碼，得到加密串B
對商戶key做md5，得到32位小寫key* ( key設定路徑：微信商戶平台(pay.weixin.qq.com)–>賬戶設定–>API安全–>密鑰設定 )
用key*對加密串B做AES-256-ECB解密
二、Golang 示例代碼
package main
import (
"encoding/base64"
"fmt"
"strings"
"github.com/nanjishidu/gomini/gocrypto"
)
func main() {
var (
paykey = "ziR0QKsTUfMOuochC9RfCdmfHECorQAP"
req_info = `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`
)
b, err := base64.StdEncoding.DecodeString(req_info)
if err != nil {
fmt.Println(b, err)
return
}
gocrypto.SetAesKey(strings.ToLower(gocrypto.Md5(paykey)))
plaintext, err := gocrypto.AesECBDecrypt(b)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(string(plaintext))
}
三、Golang 第三方庫
支援常見加解密
github.com/nanjishidu/gomini/gocrypto