最近做了一个移动项目,是有java服务器和ios客户端类型的项目,客户端是要加密登录才行的,找了一下aes加密,比较aes效率安全高,但aes虽然和des差不多,却是des的升级版。所以复杂些,要想java和ios中aes保持一致也要难些,解决问题就可以,没有绝对的安全。所以用了des很方便的就实现了java和ios的加密一致。下面是完整代码,可以直接使用,支持中英文的哦。
///////////////////java代码//////////////////////////
1.Java端的DES加密和解密的实现代码
public class DES { private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 }; public static String encryptDES(String encryptString, String encryptKey) throws Exception { IvParameterSpec zeroIv = new IvParameterSpec(iv); SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES"); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv); byte[] encryptedData = cipher.doFinal(encryptString.getBytes()); return Base64.encode(encryptedData); } public static String decryptDES(String decryptString, String decryptKey) throws Exception { byte[] byteMi = Base64.decode(decryptString); IvParameterSpec zeroIv = new IvParameterSpec(iv); SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES"); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, key, zeroIv); byte decryptedData[] = cipher.doFinal(byteMi); return new String(decryptedData); } }
上述代码用到了一个Base64的编码类,其代码的实现方式如下:
public class Base64 { private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" .toCharArray(); /** * data[]进行编码 * * @param data * @return */ public static String encode(byte[] data) { int start = 0; int len = data.length; StringBuffer buf = new StringBuffer(data.length * 3 / 2); int end = len - 3; int i = start; int n = 0; while (i <= end) { int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff); buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append(legalChars[(d >> 6) & 63]); buf.append(legalChars[d & 63]); i += 3; if (n++ >= 14) { n = 0; buf.append(" "); } } if (i == start + len - 2) { int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8); buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append(legalChars[(d >> 6) & 63]); buf.append("="); } else if (i == start + len - 1) { int d = (((int) data[i]) & 0x0ff) << 16; buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append("=="); } return buf.toString(); } public static byte[] decode(String s) { ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { decode(s, bos); } catch (IOException e) { throw new RuntimeException(); } byte[] decodedBytes = bos.toByteArray(); try { bos.close(); bos = null; } catch (IOException ex) { System.err.println("Error while decoding BASE64: " + ex.toString()); } return decodedBytes; } private static void decode(String s, OutputStream os) throws IOException { int i = 0; int len = s.length(); while (true) { while (i < len && s.charAt(i) <= ' ') i++; if (i == len) break; int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3))); os.write((tri >> 16) & 255); if (s.charAt(i + 2) == '=') break; os.write((tri >> 8) & 255); if (s.charAt(i + 3) == '=') break; os.write(tri & 255); i += 4; } } private static int decode(char c) { if (c >= 'A' && c <= 'Z') return ((int) c) - 65; else if (c >= 'a' && c <= 'z') return ((int) c) - 97 + 26; else if (c >= '0' && c <= '9') return ((int) c) - 48 + 26 + 26; else switch (c) { case '+': return 62; case '/': return 63; case '=': return 0; default: throw new RuntimeException("unexpected code: " + c); } } }
java将byte的二进制转换成16进制的方法
/**将二进制转换成16进制 * @param buf * @return String */ public static String parseByte2HexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); }
////////////////////////ios des实现代码/////////////////////////////////
2.Objective-c在iOS上实现的DES加密和解密算法:
const Byte iv[] = {1,2,3,4,5,6,7,8}; +(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key { NSString *ciphertext = nil; NSData *textData = [plainText dataUsingEncoding:NSUTF8StringEncoding]; NSUInteger dataLength = [textData length]; unsigned char buffer[1024]; memset(buffer, 0, sizeof(char)); size_t numBytesEncrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES, kCCOptionPKCS7Padding, [key UTF8String], kCCKeySizeDES, iv, [textData bytes], dataLength, buffer, 1024, &numBytesEncrypted); if (cryptStatus == kCCSuccess) { NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted]; ciphertext = [Base64 encode:data]; } return ciphertext; } +(NSString *)decryptUseDES:(NSString *)cipherText key:(NSString *)key { NSString *plaintext = nil; NSData *cipherdata = [Base64 decode:cipherText]; unsigned char buffer[1024]; memset(buffer, 0, sizeof(char)); size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES, kCCOptionPKCS7Padding, [key UTF8String], kCCKeySizeDES, iv, [cipherdata bytes], [cipherdata length], buffer, 1024, &numBytesDecrypted); if(cryptStatus == kCCSuccess) { NSData *plaindata = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted]; plaintext = [[NSString alloc]initWithData:plaindata encoding:NSUTF8StringEncoding]; } return plaintext; }
Objective-c的一个二进制转换为16进制的方法
+(NSString *) parseByte2HexString:(Byte *) bytes { NSMutableString *hexStr = [[NSMutableString alloc]init]; int i = 0; if(bytes) { while (bytes[i] != '\0') { NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16进制数 if([hexByte length]==1) [hexStr appendFormat:@"0%@", hexByte]; else [hexStr appendFormat:@"%@", hexByte]; i++; } } NSLog(@"bytes 的16进制数为:%@",hexStr); return hexStr; } +(NSString *) parseByteArray2HexString:(Byte[]) bytes { NSMutableString *hexStr = [[NSMutableString alloc]init]; int i = 0; if(bytes) { while (bytes[i] != '\0') { NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16进制数 if([hexByte length]==1) [hexStr appendFormat:@"0%@", hexByte]; else [hexStr appendFormat:@"%@", hexByte]; i++; } } NSLog(@"bytes 的16进制数为:%@",hexStr); return hexStr; }
objective-c 实现的Base64工具对象
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; @interface Base64() +(int)char2Int:(char)c; @end @implementation Base64 +(NSString *)encode:(NSData *)data { if (data.length == 0) return nil; char *characters = malloc(data.length * 3 / 2); if (characters == NULL) return nil; int end = data.length - 3; int index = 0; int charCount = 0; int n = 0; while (index <= end) { int d = (((int)(((char *)[data bytes])[index]) & 0x0ff) << 16) | (((int)(((char *)[data bytes])[index + 1]) & 0x0ff) << 8) | ((int)(((char *)[data bytes])[index + 2]) & 0x0ff); characters[charCount++] = encodingTable[(d >> 18) & 63]; characters[charCount++] = encodingTable[(d >> 12) & 63]; characters[charCount++] = encodingTable[(d >> 6) & 63]; characters[charCount++] = encodingTable[d & 63]; index += 3; if(n++ >= 14) { n = 0; characters[charCount++] = ' '; } } if(index == data.length - 2) { int d = (((int)(((char *)[data bytes])[index]) & 0x0ff) << 16) | (((int)(((char *)[data bytes])[index + 1]) & 255) << 8); characters[charCount++] = encodingTable[(d >> 18) & 63]; characters[charCount++] = encodingTable[(d >> 12) & 63]; characters[charCount++] = encodingTable[(d >> 6) & 63]; characters[charCount++] = '='; } else if(index == data.length - 1) { int d = ((int)(((char *)[data bytes])[index]) & 0x0ff) << 16; characters[charCount++] = encodingTable[(d >> 18) & 63]; characters[charCount++] = encodingTable[(d >> 12) & 63]; characters[charCount++] = '='; characters[charCount++] = '='; } NSString * rtnStr = [[NSString alloc] initWithBytesNoCopy:characters length:charCount encoding:NSUTF8StringEncoding freeWhenDone:YES]; return rtnStr; } +(NSData *)decode:(NSString *)data { if(data == nil || data.length <= 0) { return nil; } NSMutableData *rtnData = [[NSMutableData alloc]init]; int slen = data.length; int index = 0; while (true) { while (index < slen && [data characterAtIndex:index] <= ' ') { index++; } if (index >= slen || index + 3 >= slen) { break; } int byte = ([self char2Int:[data characterAtIndex:index]] << 18) + ([self char2Int:[data characterAtIndex:index + 1]] << 12) + ([self char2Int:[data characterAtIndex:index + 2]] << 6) + [self char2Int:[data characterAtIndex:index + 3]]; Byte temp1 = (byte >> 16) & 255; [rtnData appendBytes:&temp1 length:1]; if([data characterAtIndex:index + 2] == '=') { break; } Byte temp2 = (byte >> 8) & 255; [rtnData appendBytes:&temp2 length:1]; if([data characterAtIndex:index + 3] == '=') { break; } Byte temp3 = byte & 255; [rtnData appendBytes:&temp3 length:1]; index += 4; } return rtnData; } +(int)char2Int:(char)c { if (c >= 'A' && c <= 'Z') { return c - 65; } else if (c >= 'a' && c <= 'z') { return c - 97 + 26; } else if (c >= '0' && c <= '9') { return c - 48 + 26 + 26; } else { switch(c) { case '+': return 62; case '/': return 63; case '=': return 0; default: return -1; } } } @end
///////////////////////////测试///////////////////////////////////
3.Java端的测试代码如下:
String plaintext = "abcd";
String ciphertext = DES.encryptDES(plaintext, "20120401");
System.out.println("明文:" + plaintext);
System.out.println("密钥:" + "20120401");
System.out.println("密文:" + ciphertext);
System.out.println("解密后:" + DES.decryptDES(ciphertext, "20120401"));
输出结果:
明文:abcd
密钥:20120401
密文:W7HR43/usys=
解密后:abcd
4.Objective-c端的测试代码如下:
NSString *plaintext = @"abcd";
NSString *ciphertext = [EncryptUtil encryptUseDES:plaintext key"20120401"];
NSLog(@"明文:%@",plaintext);
NSLog(@"秘钥:%@",@"20120401");
NSLog(@"密文:%@",ciphertext);
输出结果:
2012-04-05 12:00:47.348 TestEncrypt[806:f803] 明文:abcd
2012-04-05 12:00:47.350 TestEncrypt[806:f803] 秘钥:20120401
2012-04-05 12:00:47.350 TestEncrypt[806:f803] 密文:W7HR43/usys=
哈哈加解密结果一致,成功了!