HarmonyOS SM4加解密相关代码案例有没有？

Question

如题：HarmonyOS SM4加解密相关代码案例有没有？

Answer 1

SM4的相关demo如下：

import cryptoFramework from '@ohos.security.cryptoFramework';
import buffer from '@ohos.buffer'; // 加密消息 

async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('SM4_128|ECB|PKCS7');
  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
  let encryptData = await cipher.doFinal(plainText);
  return encryptData;
} // 解密消息 

async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
  let decoder = cryptoFramework.createCipher('SM4_128|ECB|PKCS7');
  await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
  let decryptData = await decoder.doFinal(cipherText);
  return decryptData;
}

async function genSymKeyByData(symKeyData: Uint8Array) {
  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
  let symGenerator = cryptoFramework.createSymKeyGenerator('SM4_128');
  let symKey = await symGenerator.convertKey(symKeyBlob);
  console.info('convertKey success');
  return symKey;
}

async function main() { //服务器传入的密钥 
  let keyData =
    "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAMTW+419MhK4O1IjKxpG4JCouhIpgplQjYHPQ5VzA......Dxiz23k21Zs="; // 先对密钥进行base64解码，获取密钥Uint8Array对象 
  let base64 = new util.Base64Helper();
  let keyDatabase64 = base64.decodeSync(keyData); // 密钥Uint8Array 生成密钥 
  let symKey = await genSymKeyByData(keyDatabase64); // 此处为明文 
  let message = "This is a test"; // 把明文字符串按utf-8解码为Uint8Array 
  let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) }; // 加密消息
  let encryptText = await encryptMessagePromise(symKey, plainText); // 解密消息 
  let decryptText = await decryptMessagePromise(symKey, encryptText);
  if (plainText.data.toString() === decryptText.data.toString()) {
    console.info('decrypt ok');
    console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
  } else {
    console.error('decrypt failed');
  }
}

import cryptoFramework from '@ohos.security.cryptoFramework';
import buffer from '@ohos.buffer'; // 加密消息 

async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('SM4_128|ECB|PKCS7');
  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
  let encryptData = await cipher.doFinal(plainText);
  return encryptData;
} // 解密消息

async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
  let decoder = cryptoFramework.createCipher('SM4_128|ECB|PKCS7');
  await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
  let decryptData = await decoder.doFinal(cipherText);
  return decryptData;
}

async function genSymKeyByData(symKeyData: Uint8Array) {
  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
  let symGenerator = cryptoFramework.createSymKeyGenerator('SM4_128');
  let symKey = await symGenerator.convertKey(symKeyBlob);
  console.info('convertKey success');
  return symKey;
}

async function main() { //服务器传入的密钥
  let keyData =
    "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAMTW+419MhK4O1IjKxpG4JCouhIpgplQjYHPQ5VzA......Dxiz23k21Zs="; // 先对密钥进行base64解码，获取密钥Uint8Array对象 
  let base64 = new util.Base64Helper();
  let keyDatabase64 = base64.decodeSync(keyData); // 密钥Uint8Array 生成密钥
  let symKey =
    await genSymKeyByData(keyDatabase64); // 此处为明文 let message = "This is a test"; // 把明文字符串按utf-8解码为Uint8Array 
  let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) }; // 加密消息 
  let encryptText = await encryptMessagePromise(symKey, plainText); // 解密消息 
  let decryptText = await decryptMessagePromise(symKey, encryptText);
  if (plainText.data.toString() === decryptText.data.toString()) {
    console.info('decrypt ok');
    console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
  } else {
    console.error('decrypt failed');
  }
}

相关SM4参考指南：【 https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/crypto-sm4-sym-encrypt-decrypt-ecb-V5 】

相关随机生成SM4参考指南： 【 https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/crypto-generate-sym-key-randomly-V5\#随机生成sm4密钥 】

相关SM4规格参考指南： 【 https://developer.huawei.com/consumer/cn/doc/harmonyos-guides/crypto-sym-encrypt-decrypt-spec-V5\#sm4 】