用该库生成的publicKey和privateKey，publickKey交给服务端，服务端经过tutool库进行SM2加密后（均采用C1C3C2模式）得到的密文，用该库进

有遇到过使用该库SM2生成publicKey交由后端，后端java用hutool库加密后的密文，该库无法解密的同仁吗？ about dart_sm HOT 2 CLOSED

esummer commented on August 15, 2024

有遇到过使用该库SM2生成publicKey交由后端，后端java用hutool库加密后的密文，该库无法解密的同仁吗？

from dart_sm.

Comments (2)

luckykellan commented on August 15, 2024 1

Hutool的密文前面是04开头，需要将04去掉后使用dart_sm解密
同样，使用dart_sm.SM2加密后的密文，也需要手动增加04前缀后再使用Hutool解密

dart

  final keypair = SM2.generateKeyPair();
  final publicKey = keypair.publicKey; //041f46ff512b1091d59809565688ec76cff14e25740d63621ebdecbe9cdda294087239b67f210bcaf0aeae19e1158d7d3dc84d3be55e85a110611cba820ecca584
  final privateKey = keypair.privateKey; //a4751815dfcc307847632680f862d291f9284fb6b54aeb30c9450368ac53c0f5

java

 val sm2 = SmUtil.sm2("a4751815dfcc307847632680f862d291f9284fb6b54aeb30c9450368ac53c0f5","041f46ff512b1091d59809565688ec76cff14e25740d63621ebdecbe9cdda294087239b67f210bcaf0aeae19e1158d7d3dc84d3be55e85a110611cba820ecca584")
 val data = "123";
 val encrypt = sm2.encryptHex(data, KeyType.PublicKey) //04b6c1b407e82a865f733225c20b20d9cd6c15f2f57097f6bcce2e1a01c5a6edb6cc7046451103ced92f0982a82fa2dd0e567f313525de6dd9a541504b8f752796d99e3b7e1bb9198320c0c92926cf5aa6292907c8a4d85e61ecbeda5c502578eb04c330

回到dart解密

 // 这里注意，如果密文前两位是04，需要把04删除后解密
 final cipherText = 'd57726870661ad2bd5aea0b56c532bfea83523b4747e9ae7a739186ba0c1ee040a4d4f92c46481119069b7dd43c6d774364feb74100b497fbc0a64f58720d8ebbf0e81c4b3b647d29299d3fa43b190798060fbae88a2b5809bb72c82626e587ec1da8a';
 final plainText = SM2.decrypt(cipherText, privateKey2);
 print("plainText: $plainText"); //123