harmony 鸿蒙Encryption and Decryption with an SM4 Symmetric Key (GCM Mode) (ArkTS)

2025-06-12
浏览 (5)

Encryption and Decryption with an SM4 Symmetric Key (GCM Mode) (ArkTS)

For details about the algorithm specifications, see SM4.

Encryption

Call cryptoFramework.createSymKeyGenerator and SymKeyGenerator.generateSymKey to generate a 128-bit SM4 symmetric key (SymKey).

In addition to the example in this topic, SM4 and Randomly Generating a Symmetric Key may help you better understand how to generate an SM4 symmetric key. Note that the input parameters in the reference documents may be different from those in the example below.

Call cryptoFramework.createCipher with the string parameter ‘SM4_128|GCM|PKCS7’ to create a Cipher instance for encryption. The key type is SM4_128, block cipher mode is GCM, and the padding mode is PKCS7.
Call Cipher.init to initialize the Cipher instance. In the Cipher.init API, set opMode to CryptoMode.ENCRYPT_MODE (encryption), key to SymKey (the key for encryption), and params to GcmParamsSpec corresponding to the GCM mode.
Call Cipher.update to pass in the data to be encrypted (plaintext).

Currently, the amount of data to be passed in by a single Cipher.update is not limited. You can determine how to pass in data based on the data volume.

If a small amount of data is to be encrypted, you can use Cipher.doFinal immediately after Cipher.init.
If a large amount of data is to be encrypted, you can call Cipher.update multiple times to pass in the data by segment.
Call Cipher.doFinal to obtain the encrypted data.
- If data has been passed in by Cipher.update, pass in null in the data parameter of Cipher.doFinal.
- The output of Cipher.doFinal may be null. To avoid exceptions, always check whether the result is null before accessing specific data.
Obtain GcmParamsSpec.authTag as the authentication information for decryption. In GCM mode, extract the last 16 bytes from the encrypted data as the authentication information for initializing the Cipher instance in decryption. In the example, authTag is of 16 bytes.

Decryption

Call cryptoFramework.createCipher with the string parameter ‘SM4_128|GCM|PKCS7’ to create a Cipher instance for decryption. The key type is SM4_128, block cipher mode is GCM, and the padding mode is PKCS7.
Call Cipher.init to initialize the Cipher instance. In the Cipher.init API, set opMode to CryptoMode.DECRYPT_MODE (decryption), key to SymKey (the key for decryption), and params to GcmParamsSpec corresponding to the GCM mode.
Call Cipher.update to pass in the data to be decrypted (ciphertext).
Call Cipher.doFinal to obtain the decrypted data.
Example (using asynchronous APIs):

  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
  import { buffer } from '@kit.ArkTS';

  function generateRandom(len: number) {
    let rand = cryptoFramework.createRandom();
    let generateRandSync = rand.generateRandomSync(len);
    return generateRandSync;
  }

  function genGcmParamsSpec() {
    let ivBlob = generateRandom(12); // 12 bytes
    let arr = [1, 2, 3, 4, 5, 6, 7, 8]; // 8 bytes
    let dataAad = new Uint8Array(arr);
    let aadBlob: cryptoFramework.DataBlob = { data: dataAad };
    arr = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; // 16 bytes
    let dataTag = new Uint8Array(arr);
    let tagBlob: cryptoFramework.DataBlob = {
      data: dataTag
    }; 
    // Obtain the GCM authTag from the Cipher.doFinal result in encryption and fill it in the params parameter of Cipher.init in decryption.
    let gcmParamsSpec: cryptoFramework.GcmParamsSpec = {
      iv: ivBlob,
      aad: aadBlob,
      authTag: tagBlob,
      algName: "GcmParamsSpec"
    };
    return gcmParamsSpec;
  }

  let gcmParams = genGcmParamsSpec();

  // Encrypt the message.
  async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
    let cipher = cryptoFramework.createCipher('SM4_128|GCM|PKCS7');
    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, gcmParams);
    let encryptUpdate = await cipher.update(plainText);
    // In GCM mode, pass in null in Cipher.doFinal in encryption. Obtain the tag data and fill it in the gcmParams object.
    gcmParams.authTag = await cipher.doFinal(null);
    return encryptUpdate;
  }
  // Decrypt the message.
  async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
    let decoder = cryptoFramework.createCipher('SM4_128|GCM|PKCS7');
    await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, gcmParams);
    let decryptUpdate = await decoder.update(cipherText);
    // In GCM mode, pass in null in Cipher.doFinal in decryption. Verify the tag data passed in Cipher.init. If the verification fails, an exception will be thrown.
    let decryptData = await decoder.doFinal(null);
    if (decryptData === null) {
      console.info('GCM decrypt success, decryptData is null');
    }
    return decryptUpdate;
  }
  async function genSymKeyByData(symKeyData: Uint8Array) {
    let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
    let sm4Generator = cryptoFramework.createSymKeyGenerator('SM4_128');
    let symKey = await sm4Generator.convertKey(symKeyBlob);
    console.info('convertKey success');
    return symKey;
  }
  async function main() {
    let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
    let symKey = await genSymKeyByData(keyData);
    let message = "This is a test";
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
    let encryptText = await encryptMessagePromise(symKey, plainText);
    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');
    }
  }

Example (using synchronous APIs):

  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
  import { buffer } from '@kit.ArkTS';

  function generateRandom(len: number) {
    let rand = cryptoFramework.createRandom();
    let generateRandSync = rand.generateRandomSync(len);
    return generateRandSync;
  }

  function genGcmParamsSpec() {
    let ivBlob = generateRandom(12); // 12 bytes
    let arr = [1, 2, 3, 4, 5, 6, 7, 8]; // 8 bytes
    let dataAad = new Uint8Array(arr);
    let aadBlob: cryptoFramework.DataBlob = { data: dataAad };
    arr = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; // 16 bytes
    let dataTag = new Uint8Array(arr);
    let tagBlob: cryptoFramework.DataBlob = {
      data: dataTag
    };
    // Obtain the GCM authTag from the Cipher.doFinal result in encryption and fill it in the params parameter of Cipher.init in decryption.
    let gcmParamsSpec: cryptoFramework.GcmParamsSpec = {
      iv: ivBlob,
      aad: aadBlob,
      authTag: tagBlob,
      algName: "GcmParamsSpec"
    };
    return gcmParamsSpec;
  }

  let gcmParams = genGcmParamsSpec();

  // Encrypt the message.
  function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
    let cipher = cryptoFramework.createCipher('SM4_128|GCM|PKCS7');
    cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, gcmParams);
    let encryptUpdate = cipher.updateSync(plainText);
    // In GCM mode, pass in null in Cipher.doFinal in encryption. Obtain the tag data and fill it in the gcmParams object.
    gcmParams.authTag = cipher.doFinalSync(null);
    return encryptUpdate;
  }
  // Decrypt the message.
  function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
    let decoder = cryptoFramework.createCipher('SM4_128|GCM|PKCS7');
    decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, gcmParams);
    let decryptUpdate = decoder.updateSync(cipherText);
    // In GCM mode, pass in null in Cipher.doFinal in decryption. Verify the tag data passed in Cipher.init. If the verification fails, an exception will be thrown.
    let decryptData = decoder.doFinalSync(null);
    if (decryptData === null) {
      console.info('GCM decrypt success, decryptData is null');
    }
    return decryptUpdate;
  }
  function genSymKeyByData(symKeyData: Uint8Array) {
    let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
    let sm4Generator = cryptoFramework.createSymKeyGenerator('SM4_128');
    let symKey = sm4Generator.convertKeySync(symKeyBlob);
    console.info('convertKeySync success');
    return symKey;
  }
  function main() {
    let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
    let symKey = genSymKeyByData(keyData);
    let message = "This is a test";
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
    let encryptText = encryptMessage(symKey, plainText);
    let decryptText = decryptMessage(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');
    }
  }