AES加密(兼容php，java，objective-c)

http://ju.outofmemory.cn/entry/156674

这些天开发android,ios的客户端需要与服务端用php开发的api进行数据交互。为了高大上一些决定用aes加密，但是问题就来了，因为aes有好几种模式，每种模式在各种语言下都是差异化的表现方式，探索了许久终于找到合适他们三种语言的的一套方案。

php：

php的代码就比较简单，几行就搞定

static $iv = 'AESAPPCLIENT_KEY';//16或16的倍数长个char

//$privateKey是加密 解密需要的密钥

function aesEncode($data,$privateKey){

$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $privateKey, $data, MCRYPT_MODE_CBC,$iv);

return rtrim((base64_encode($encrypted)));

}

function aesDecode($data,$privateKey){

$encryptedData = base64_decode($data);

$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $privateKey, $encryptedData, MCRYPT_MODE_CBC,$iv);

return rtrim($decrypted);

}

加密后末尾莫名多了些东东 就用rtrim()去掉了

java:

主要注意要补零

public class ToolsUtils {

private final static String IVKEY = “AESAPPCLIENT_KEY”;

public static String encrypt(String data,String key) {

try {

Cipher cipher = Cipher.getInstance(“AES/CBC/NoPadding”);

int blockSize = cipher.getBlockSize();

SecretKeySpec keyspec = new SecretKeySpec(fullZore(key,blockSize), “AES”);

IvParameterSpec ivspec = new IvParameterSpec(fullZore(IVKEY,blockSize));

cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

byte[] encrypted = cipher.doFinal(fullZore(data,blockSize));

return new String(Base64.encode(encrypted, Base64.DEFAULT)).trim();

} catch (Exception e) {

e.printStackTrace();

return “”;

}

}

public static String decrypt(String data,String key) {

try {

Cipher cipher = Cipher.getInstance(“AES/CBC/NoPadding”);

int blockSize = cipher.getBlockSize();

SecretKeySpec keyspec = new SecretKeySpec(fullZore(key,blockSize), “AES”);

IvParameterSpec ivspec = new IvParameterSpec(fullZore(IVKEY,blockSize));

cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

byte[] decrypted = cipher.doFinal(Base64. decode(data, Base64.DEFAULT));

return new String(decrypted).trim();

} catch (Exception e) {

e.printStackTrace();

return “”;

}

}

public static byte[] fullZore(String data,int blockSize){

byte[] dataBytes = data.getBytes();

int plaintextLength = dataBytes.length;

if (plaintextLength % blockSize != 0) {

plaintextLength = plaintextLength + (blockSize – (plaintextLength % blockSize));

}

byte[] plaintext = new byte[plaintextLength];

System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

return plaintext;

}

}

objective-c:

也是主要注意要补零

NSData+AES.h

#import <Foundation/Foundation.h>

#import <Foundation/Foundation.h>

#import <CommonCrypto/CommonCryptor.h>

@interface NSData (AES)

– (NSData *)AES128EncryptWithKey:(NSString *)key iv:(NSString *)iv;

– (NSData *)AES128DecryptWithKey:(NSString *)key iv:(NSString *)iv;

– (NSString *)base64Encoding;

+ (id)dataWithBase64EncodedString:(NSString *)string;

@end

NSData+AES.m

#import "NSData+AES.h"

static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

@implementation NSData (AES)

– (NSData *)AES128EncryptWithKey:(NSString *)key iv:(NSString *)iv

{

char keyPtr[kCCKeySizeAES128+1];

bzero(keyPtr, sizeof(keyPtr));

[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

char ivPtr[kCCKeySizeAES128+1];

bzero(ivPtr, sizeof(ivPtr));

[iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];

NSUInteger dataLength = [self length];

int diff = kCCKeySizeAES128 – (dataLength % kCCKeySizeAES128);

int newSize = 0;

if(diff > 0)

{

newSize = dataLength + diff;

}

char dataPtr[newSize];

memcpy(dataPtr, [self bytes], [self length]);

for(int i = 0; i < diff; i++)

{

dataPtr[i + dataLength] = 0x00;

}

size_t bufferSize = newSize + kCCBlockSizeAES128;

void *buffer = malloc(bufferSize);

size_t numBytesEncrypted = 0;

CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,

kCCAlgorithmAES128,

0x00, //No padding

keyPtr,

kCCKeySizeAES128,

ivPtr,

dataPtr,

sizeof(dataPtr),

buffer,

bufferSize,

&numBytesEncrypted);

if(cryptStatus == kCCSuccess)

{

return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];

}

return nil;

}

– (NSData *)AES128DecryptWithKey:(NSString *)key iv:(NSString *)iv

{

char keyPtr[kCCKeySizeAES128+1];

bzero(keyPtr, sizeof(keyPtr));

[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

char ivPtr[kCCKeySizeAES128+1];

bzero(ivPtr, sizeof(ivPtr));

[iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];

NSUInteger dataLength = [self length];

size_t bufferSize = dataLength + kCCBlockSizeAES128;

void *buffer = malloc(bufferSize);

size_t numBytesEncrypted = 0;

CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,

kCCAlgorithmAES128,

0x00, //No padding

keyPtr,

kCCKeySizeAES128,

ivPtr,

[self bytes],

dataLength,

buffer,

bufferSize,

&numBytesEncrypted);

if(cryptStatus == kCCSuccess)

{

return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];

}

return nil;

}

+ (id)dataWithBase64EncodedString:(NSString *)string;

{

if (string == nil)

[NSException raise:NSInvalidArgumentException format:nil];

if ([string length] == 0)

return [NSData data];

static char *decodingTable = NULL;

if (decodingTable == NULL)

{

decodingTable = malloc(256);

if (decodingTable == NULL)

return nil;

memset(decodingTable, CHAR_MAX, 256);

NSUInteger i;

for (i = 0; i < 64; i++)

decodingTable[(short)encodingTable[i]] = i;

}

const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];

if (characters == NULL) // Not an ASCII string!

return nil;

char *bytes = malloc((([string length] + 3) / 4) * 3);

if (bytes == NULL)

return nil;

NSUInteger length = 0;

NSUInteger i = 0;

while (YES)

{

char buffer[4];

short bufferLength;

for (bufferLength = 0; bufferLength < 4; i++)

{

if (characters[i] == ‘\0’)

break;

if (isspace(characters[i]) || characters[i] == ‘=’)

continue;

buffer[bufferLength] = decodingTable[(short)characters[i]];

if (buffer[bufferLength++] == CHAR_MAX) // Illegal character!

{

free(bytes);

return nil;

}

}

if (bufferLength == 0)

break;

if (bufferLength == 1) // At least two characters are needed to produce one byte!

{

free(bytes);

return nil;

}

// Decode the characters in the buffer to bytes.

bytes[length++] = (buffer[0] << 2) | (buffer[1] >> 4);

if (bufferLength > 2)

bytes[length++] = (buffer[1] << 4) | (buffer[2] >> 2);

if (bufferLength > 3)

bytes[length++] = (buffer[2] << 6) | buffer[3];

}

bytes = realloc(bytes, length);

return [NSData dataWithBytesNoCopy:bytes length:length];

}

– (NSString *)base64Encoding

{

if ([self length] == 0)

return @””;

char *characters = malloc((([self length] + 2) / 3) * 4);

if (characters == NULL)

return nil;

NSUInteger length = 0;

NSUInteger i = 0;

while (i < [self length])

{

char buffer[3] = {0,0,0};

short bufferLength = 0;

while (bufferLength < 3 && i < [self length]) buffer[bufferLength++] = ((char *)[self bytes])[i++]; // Encode the bytes in the buffer to four characters, including padding “=” characters if necessary. characters[length++] = encodingTable[(buffer[0] & 0xFC)
>> 2];

characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];

if (bufferLength > 1)

characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];

else characters[length++] = ‘=’;

if (bufferLength > 2)

characters[length++] = encodingTable[buffer[2] & 0x3F];

else characters[length++] = ‘=’;

}

return [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSUTF8StringEncoding freeWhenDone:YES];

}

@end