AES加密工具类封装
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2022-05-09 20:25:23
import android.util.Base64;import java.security.MessageDigest;import java.security.spec.AlgorithmParameterSpec;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;public class AES64 { pri....
import android.util.Base64; import java.security.MessageDigest; import java.security.spec.AlgorithmParameterSpec; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; public class AES64 { private final Cipher cipher; private final SecretKeySpec key; private AlgorithmParameterSpec spec; // 密钥 public static final String SEED_16_CHARACTER = "更换成自己的密钥"; public AES64() throws Exception { // hash password with SHA-256 and crop the output to 128-bit for key MessageDigest digest = MessageDigest.getInstance("SHA-256");//AES-256-CBC digest.update(SEED_16_CHARACTER.getBytes("UTF-8")); byte[] keyBytes = new byte[32]; System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length); cipher = Cipher.getInstance("AES/CBC/PKCS7Padding"); key = new SecretKeySpec(keyBytes, "AES"); spec = getIV(); } public AlgorithmParameterSpec getIV() { byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; IvParameterSpec ivParameterSpec; ivParameterSpec = new IvParameterSpec(iv); return ivParameterSpec; } /** * 加密 * @param plainText * @return * @throws Exception */ public String encrypt(String plainText) throws Exception { cipher.init(Cipher.ENCRYPT_MODE, key, spec); byte[] encrypted = cipher.doFinal(plainText.trim().getBytes("UTF-8")); String encryptedText = new String(Base64.encode(encrypted, Base64.DEFAULT), "UTF-8"); encryptedText = encryptedText.replace("\n", ""); return encryptedText; } /** * 解密 * @param cryptedText * @return * @throws Exception */ public String decrypt(String cryptedText) throws Exception { cipher.init(Cipher.DECRYPT_MODE, key, spec); byte[] bytes = Base64.decode(cryptedText, Base64.DEFAULT); byte[] decrypted = cipher.doFinal(bytes); String decryptedText = new String(decrypted, "UTF-8"); return decryptedText; } }
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