package com.dji.sample.droneairport.utils.SM2;
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import org.bouncycastle.crypto.InvalidCipherTextException;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.security.NoSuchAlgorithmException;
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import java.util.Base64;
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import java.util.Map;
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public class Utils {
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/**
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* get key pair
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*/
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public static Map<String, String> createKeyPair() throws NoSuchAlgorithmException {
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return SecretCommon.createKeyPair();
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}
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/**
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* encrypt
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*
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* @param plainText 需加密的明文字符串
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* @param publicKey 公钥
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*/
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public static String encrypt(String plainText, String publicKey) throws IOException, InvalidCipherTextException {
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publicKey=ensurePrefix(publicKey);
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return encrypt(plainText, publicKey, ModeTypeConstant.BASE);
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}
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/**
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* encrypt
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*
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* @param plainText 需加密的明文字符串
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* @param publicKey 公钥
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* @param modeType base:标准；bc：BC模式
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*/
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public static String encrypt(String plainText, String publicKey, String modeType) throws IOException, InvalidCipherTextException {
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return SecretCommon.encrypt(plainText, publicKey, ModeTypeConstant.getMode(modeType));
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}
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/**
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* decrypt
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*
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* @param cipherText 需加密的字符串
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* @param privateKey 私钥
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*/
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public static String decrypt(String cipherText, String privateKey) throws InvalidCipherTextException, UnsupportedEncodingException {
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cipherText = ensurePrefix(cipherText);
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return decrypt(cipherText, privateKey, ModeTypeConstant.BASE);
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}
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/**
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* decrypt
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*
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* @param cipherText 需加密的字符串
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* @param privateKey 私钥
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* @param modeType base:标准；bc：BC模式
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*/
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public static String decrypt(String cipherText, String privateKey, String modeType) throws InvalidCipherTextException, UnsupportedEncodingException {
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return SecretCommon.decrypt(cipherText, privateKey, ModeTypeConstant.getMode(modeType));
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}
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public static String ensurePrefix(String input) {
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// 检查字符串是否以 "04" 开头
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if (!input.startsWith("04")) {
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return "04" + input; // 添加前缀
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}
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return input; // 原样返回
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}
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// 将 Hex 格式的字符串转换为字节数组
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public static byte[] hexToBytes(String hex) {
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int length = hex.length();
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byte[] data = new byte[length / 2];
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for (int i = 0; i < length; i += 2) {
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data[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4)
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+ Character.digit(hex.charAt(i + 1), 16));
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}
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return data;
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}
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// 将 DER 格式的字节数组转换为 Base64 编码的字符串
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public static String convertDerToBase64(byte[] derKey) {
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return Base64.getEncoder().encodeToString(derKey);
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}
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// 将 Base64 编码的字符串转换为 Hex 格式的字符串
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public static String convertBase64ToHex(String base64Key) throws Exception {
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// 将 Base64 解码为 DER 编码的字节数组
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byte[] derBytes = Base64.getDecoder().decode(base64Key);
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// 将 DER 编码的字节数组转换为 Hex 格式的字符串
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return bytesToHex(derBytes);
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}
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// 将字节数组转换为 Hex 格式的字符串
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private static String bytesToHex(byte[] bytes) {
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StringBuilder hexString = new StringBuilder();
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for (byte b : bytes) {
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String hex = Integer.toHexString(0xff & b);
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if (hex.length() == 1) {
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hexString.append('0');
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}
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hexString.append(hex);
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}
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return hexString.toString().toUpperCase(); // Convert to uppercase for consistency
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}
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public static String hexToBase64(String hexString) {
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// 将 Hex 字符串转换为字节数组
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byte[] bytes = hexStringToByteArray(hexString);
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// 将字节数组转换为 Base64 字符串
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return Base64.getEncoder().encodeToString(bytes);
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}
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private static byte[] hexStringToByteArray(String hexString) {
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int len = hexString.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4)
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+ Character.digit(hexString.charAt(i+1), 16));
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}
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return data;
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}
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}
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