PHP 代码如下：
<?php/** * 加密解密 字符串 * @param string $string 原字符串 * @param string $auth_key 加密的KEY * @param string $operation 加密解密的开关 ENCODE：加密， DECODE：解密 * @return string|mixed */function authCode($string, $auth_key, $operation='ENCODE') {$key = md5($auth_key);$key_length = strlen($key);//base64_decode 默认是 iso-8859-1 转 UTF-8 用 utf8_decode(base64_decode($string))$string = $operation == 'DECODE' ? utf8_decode(base64_decode($string)) : substr(md5($string.$key), 0, 8).$string;$string_length = strlen($string);$rndkey = $box = array();$result = '';for($i = 0; $i <= 255; $i++) {$rndkey[$i] = ord($key[$i % $key_length]);$box[$i] = $i;}for($j = $i = 0; $i < 256; $i++) {$j = ($j + $box[$i] + $rndkey[$i]) % 256;$tmp = $box[$i];$box[$i] = $box[$j];$box[$j] = $tmp;}for($a = $j = $i = 0; $i < $string_length; $i++) {$a = ($a + 1) % 256;$j = ($j + $box[$a]) % 256;$tmp = $box[$a];$box[$a] = $box[$j];$box[$j] = $tmp;$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));}if($operation == 'DECODE') {if(substr($result, 0, 8) == substr(md5(substr($result, 8).$key), 0, 8)) {return substr($result, 8);} else {return '';}} else {//base64_encode 默认是 iso-8859-1 转 UTF-8 用 base64_encode(utf8_encode($result))return str_replace('=', '',base64_encode(utf8_encode($result)));}}$key = "123";$string = "test";$a = authCode($string, $key);var_dump($a);var_dump(authCode($a, $key,'DECODE'));?>
objective-c 代码如下:
//// Base64.h// Base64//// Created by wangzhongbin on 13-7-5.// Copyright (c) 2013年 iOS Group. All rights reserved.//#import <Foundation/Foundation.h>@interface NSData (Base64)+ (NSData *)dataWithBase64EncodedString:(NSString *)string;- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth;- (NSString *)base64EncodedString;@end@interface NSString (Base64)+ (NSString *)stringWithBase64EncodedString:(NSString *)string encoding:(NSStringEncoding)encoding;+ (NSString *)stringWithBase64EncodedString:(NSString *)string;- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth;- (NSString *)base64EncodedString:(NSStringEncoding)encoding;- (NSString *)base64EncodedString;- (NSString *)base64DecodedString:(NSStringEncoding)encoding;- (NSString *)base64DecodedString;- (NSData *)base64DecodedData;- (NSString *)authCodeEncoded:(NSString *)key encoding:(NSStringEncoding)encoding;- (NSString *)authCodeEncoded:(NSString *)key;- (NSString *)authCodeDecoded:(NSString *)key encoding:(NSStringEncoding)encoding;- (NSString *)authCodeDecoded:(NSString *)key;@end//// Base64.m// Base64//// Created by wangzhongbin on 13-7-5.// Copyright (c) 2013年 iOS Group. All rights reserved.//#import "Base64.h"#import <CommonCrypto/CommonDigest.h>#import <Availability.h>#if !__has_feature(objc_arc)#error This library requires automatic reference counting#endiftypedef enum {NSStringAuthCodeEncoded,NSStringAuthCodeDecoded} NSStringAuthCode;@implementation NSData (Base64)+ (NSData *)dataWithBase64EncodedString:(NSString *)string{const char lookup[] ={99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 62, 99, 99, 99, 63,52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 99, 99, 99, 99, 99, 99,99, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 99, 99, 99, 99, 99,99, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 99, 99, 99, 99, 99};NSData *inputData = [string dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];long long inputLength = [inputData length];const unsigned char *inputBytes = [inputData bytes];long long maxOutputLength = (inputLength / 4 + 1) * 3;NSMutableData *outputData = [NSMutableData dataWithLength:maxOutputLength];unsigned char *outputBytes = (unsigned char *)[outputData mutableBytes];int accumulator = 0;long long outputLength = 0;unsigned char accumulated[] = {0, 0, 0, 0};for (long long i = 0; i < inputLength; i++){unsigned char decoded = lookup[inputBytes[i] & 0x7F];if (decoded != 99){accumulated[accumulator] = decoded;if (accumulator == 3){outputBytes[outputLength++] = (accumulated[0] << 2) | (accumulated[1] >> 4);outputBytes[outputLength++] = (accumulated[1] << 4) | (accumulated[2] >> 2);outputBytes[outputLength++] = (accumulated[2] << 6) | accumulated[3];}accumulator = (accumulator + 1) % 4;}}//handle left-over dataif (accumulator > 0) outputBytes[outputLength] = (accumulated[0] << 2) | (accumulated[1] >> 4);if (accumulator > 1) outputBytes[++outputLength] = (accumulated[1] << 4) | (accumulated[2] >> 2);if (accumulator > 2) outputLength++;//truncate data to match actual output lengthoutputData.length = outputLength;return outputLength? outputData: nil;}- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth{//ensure wrapWidth is a multiple of 4wrapWidth = (wrapWidth / 4) * 4;const char lookup[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";long long inputLength = [self length];const unsigned char *inputBytes = [self bytes];long long maxOutputLength = (inputLength / 3 + 1) * 4;maxOutputLength += wrapWidth? (maxOutputLength / wrapWidth) * 2: 0;unsigned char *outputBytes = (unsigned char *)malloc(maxOutputLength);long long i;long long outputLength = 0;for (i = 0; i < inputLength – 2; i += 3){outputBytes[outputLength++] = lookup[(inputBytes[i] & 0xFC) >> 2];outputBytes[outputLength++] = lookup[((inputBytes[i] & 0x03) << 4) | ((inputBytes[i + 1] & 0xF0) >> 4)];outputBytes[outputLength++] = lookup[((inputBytes[i + 1] & 0x0F) << 2) | ((inputBytes[i + 2] & 0xC0) >> 6)];outputBytes[outputLength++] = lookup[inputBytes[i + 2] & 0x3F];//add line breakif (wrapWidth && (outputLength + 2) % (wrapWidth + 2) == 0){outputBytes[outputLength++] = '\r';outputBytes[outputLength++] = '\n';}}//handle left-over dataif (i == inputLength – 2){// = terminatoroutputBytes[outputLength++] = lookup[(inputBytes[i] & 0xFC) >> 2];outputBytes[outputLength++] = lookup[((inputBytes[i] & 0x03) << 4) | ((inputBytes[i + 1] & 0xF0) >> 4)];outputBytes[outputLength++] = lookup[(inputBytes[i + 1] & 0x0F) << 2];outputBytes[outputLength++] = '=';}else if (i == inputLength – 1){// == terminatoroutputBytes[outputLength++] = lookup[(inputBytes[i] & 0xFC) >> 2];outputBytes[outputLength++] = lookup[(inputBytes[i] & 0x03) << 4];outputBytes[outputLength++] = '=';outputBytes[outputLength++] = '=';}if (outputLength >= 4){//truncate data to match actual output lengthoutputBytes = realloc(outputBytes, outputLength);return [[NSString alloc] initWithBytesNoCopy:outputByteslength:outputLengthencoding:NSASCIIStringEncodingfreeWhenDone:YES];}else if (outputBytes){free(outputBytes);}return nil;}- (NSString *)base64EncodedString{return [self base64EncodedStringWithWrapWidth:0];}@end@implementation NSString (Base64)+ (NSString *)stringWithBase64EncodedString:(NSString *)string encoding:(NSStringEncoding)encoding{NSData *data = [NSData dataWithBase64EncodedString:string];if (data){return [[self alloc] initWithData:data encoding:encoding];}return nil;}+ (NSString *)stringWithBase64EncodedString:(NSString *)string{return [self stringWithBase64EncodedString:string encoding:NSUTF8StringEncoding];}- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth{NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];return [data base64EncodedStringWithWrapWidth:wrapWidth];}- (NSString *)base64EncodedString:(NSStringEncoding)encoding{NSData *data = [self dataUsingEncoding:encoding allowLossyConversion:YES];return [data base64EncodedString];}- (NSString *)base64EncodedString{return [self base64EncodedString:NSUTF8StringEncoding];}- (NSString *)base64DecodedString:(NSStringEncoding)encoding{return [NSString stringWithBase64EncodedString:self encoding:encoding];}- (NSString *)base64DecodedString{return [NSString stringWithBase64EncodedString:self];}- (NSData *)base64DecodedData{return [NSData dataWithBase64EncodedString:self];}- (NSString *)md5 {const char *concat_str = [self UTF8String];unsigned char result[CC_MD5_DIGEST_LENGTH];CC_MD5(concat_str, strlen(concat_str), result);NSMutableString *hash = [NSMutableString string];for (int i = 0; i < 16; i++)[hash appendFormat:@"%02x", result[i]];return [hash lowercaseString];}- (NSString *)authCode:(NSString *)auth_key operation:(NSStringAuthCode)operation encoding:(NSStringEncoding)encoding;{NSMutableArray *rndkey = [NSMutableArray array];NSMutableArray *box = [NSMutableArray array];NSMutableString *result = [NSMutableString string];NSString *key = [auth_key md5];NSUInteger key_length = key.length;NSString *string = (operation == NSStringAuthCodeDecoded) ? [self base64DecodedString:encoding] : [NSString stringWithFormat:@"%@%@",[[[NSString stringWithFormat:@"%@%@",self,key] md5] substringToIndex:8],self];NSUInteger string_length = string.length;for(int i = 0; i <= 255; i++) {[rndkey addObject:[NSNumber numberWithUnsignedShort:[key characterAtIndex:i%key_length]]];[box addObject:[NSNumber numberWithUnsignedShort:i]];}int j = 0;for(int i = 0; i < 256; i++) {unsigned short b = [[box objectAtIndex:i] unsignedShortValue];unsigned short r = [[rndkey objectAtIndex:i] unsignedShortValue];j = (j + b + r) % 256;[box replaceObjectAtIndex:i withObject:[box objectAtIndex:j]];[box replaceObjectAtIndex:j withObject:[NSNumber numberWithUnsignedShort:b]];}int a = 0;j = 0;for(int i = 0; i < string_length; i++) {a = (a + 1) % 256;unsigned short b = [[box objectAtIndex:a] unsignedShortValue];j = (j + b) % 256;[box replaceObjectAtIndex:a withObject:[box objectAtIndex:j]];[box replaceObjectAtIndex:j withObject:[NSNumber numberWithUnsignedShort:b]];unsigned short sc = [string characterAtIndex:i];unsigned short bi = [[box objectAtIndex:(([[box objectAtIndex:a] unsignedShortValue] + [[box objectAtIndex:j] unsignedShortValue]) % 256)] unsignedShortValue];unsigned short k = sc ^ bi;[result appendFormat:@"%C",k];}if(operation == NSStringAuthCodeDecoded) {NSString *start = [result substringToIndex:8];NSString *end = [[[NSString stringWithFormat:@"%@%@",[result substringFromIndex:8],key] md5] substringToIndex:8];if([start isEqualToString:end]){return [result substringFromIndex:8];}else{return nil;}} else {return [[result base64EncodedString:encoding] stringByReplacingOccurrencesOfString:@"=" withString:@""];}}- (NSString *)authCodeEncoded:(NSString *)key encoding:(NSStringEncoding)encoding{return [self authCode:key operation:NSStringAuthCodeEncoded encoding:encoding];}- (NSString *)authCodeEncoded:(NSString *)key{return [self authCodeEncoded:key encoding:NSUTF8StringEncoding];}- (NSString *)authCodeDecoded:(NSString *)key encoding:(NSStringEncoding)encoding{return [self authCode:key operation:NSStringAuthCodeDecoded encoding:encoding];}- (NSString *)authCodeDecoded:(NSString *)key{return [self authCodeDecoded:key encoding:NSUTF8StringEncoding];}@end NSString *key = @"123";NSString *string = @"test";NSString *a = [string authCodeEncoded:key];NSLog(@"%@",a);NSLog(@"%@",[a authCodeDecoded:key]);
，有的旅行时为了寻找逝去的年华，重温青春的惆怅。
