Base64编码和解码
- DES加密后密文长度是8个整数倍
- 加密后比明文长度变长，所以编码表找不到对应字符，乱码
- 使用Base64编码和解密：从Apache现在
1.加密后密文使用Base64编码
2.解密前对密文解码
public static String encode(byte[] data) {StringBuffer sb = new StringBuffer();int len = data.length;int i = 0;int b1, b2, b3;while (i < len) {b1 = data[i++] & 0xff;if (i == len) {sb.append(base64EncodeChars[b1 >>> 2]);sb.append(base64EncodeChars[(b1 & 0x3) << 4]);sb.append("==");break;}b2 = data[i++] & 0xff;if (i == len) {sb.append(base64EncodeChars[b1 >>> 2]);sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);sb.append("=");break;}b3 = data[i++] & 0xff;sb.append(base64EncodeChars[b1 >>> 2]);sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);sb.append(base64EncodeChars[b3 & 0x3f]);}return sb.toString();}public static byte[] decode(String str) throws UnsupportedEncodingException {StringBuffer sb = new StringBuffer();byte[] data = str.getBytes("US-ASCII");int len = data.length;int i = 0;int b1, b2, b3, b4;while (i < len) {/* b1 */do {b1 = base64DecodeChars[data[i++]];} while (i < len && b1 == -1);if (b1 == -1) break;/* b2 */do {b2 = base64DecodeChars[data[i++]];} while (i < len && b2 == -1);if (b2 == -1) break;sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));/* b3 */do {b3 = data[i++];if (b3 == 61) return sb.toString().getBytes("ISO-8859-1");b3 = base64DecodeChars[b3];} while (i < len && b3 == -1);if (b3 == -1) break;sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));/* b4 */do {b4 = data[i++];if (b4 == 61) return sb.toString().getBytes("ISO-8859-1");b4 = base64DecodeChars[b4];} while (i < len && b4 == -1);if (b4 == -1) break;sb.append((char) (((b3 & 0x03) << 6) | b4));}return sb.toString().getBytes("ISO-8859-1");}
转载于:https://www.cnblogs.com/nangongyibin/p/10391651.html