官方教程https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/getPhoneNumber.html
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<dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcprov-jdk15on</artifactId> <version>1.57</version> </dependency>
import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.util.Arrays; import org.bouncycastle.util.encoders.Base64; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import java.security.Key; import java.security.Security; /** * 微信工具类 */ public class WechatDecryptDataUtil { public static void main(String[] args) { String result = decryptData( "sDXrUftQyBSyY7M4Ro4Xvjl8amI2agPjUWkcJXTJx6qsqaeetGdE7bp7P7V95aU7TS6O6l9cSznKhw5dhvkjSE+2vH19SntKxvfNtWUJigVKgzB28ACPjROC/4tidR4mMjJO81HX9pMCjusMVdYy0YzlYvvtCgTUNIOHNByMSB5fJ+vXIMnw==", "9y9P6RqKVZiWg==", "Yi1SGcsMg==" ); System.out.println("result = " + result); } public static String decryptData(String encryptDataB64, String sessionKeyB64, String ivB64) { return new String( decryptOfDiyIV( Base64.decode(encryptDataB64), Base64.decode(sessionKeyB64), Base64.decode(ivB64) ) ); } private static final String KEY_ALGORITHM = "AES"; private static final String ALGORITHM_STR = "AES/CBC/PKCS7Padding"; private static Key key; private static Cipher cipher; private static void init(byte[] keyBytes) { // 若是密钥不足16位,那么就补足. 这个if 中的内容很重要 int base = 16; if (keyBytes.length % base != 0) { int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0); byte[] temp = new byte[groups * base]; Arrays.fill(temp, (byte) 0); System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length); keyBytes = temp; } // 初始化 Security.addProvider(new BouncyCastleProvider()); // 转化成JAVA的密钥格式 key = new SecretKeySpec(keyBytes, KEY_ALGORITHM); try { // 初始化cipher cipher = Cipher.getInstance(ALGORITHM_STR, "BC"); } catch (Exception e) { e.printStackTrace(); } } /** * 解密方法 * * @param encryptedData 要解密的字符串 * @param keyBytes 解密密钥 * @param ivs 自定义对称解密算法初始向量 iv * @return 解密后的字节数组 */ private static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes, byte[] ivs) { byte[] encryptedText = null; init(keyBytes); try { cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs)); encryptedText = cipher.doFinal(encryptedData); } catch (Exception e) { e.printStackTrace(); } return encryptedText; } }