IOS加密 AES 256算法(EncryptAndDecrypt.h)
【摘要】
EncryptAndDecrypt.h#import <Foundation/Foundation.h> @class NSString; @interface NSData (Encryption) - (NSData *)AES256EncryptWithKey:(NSData *)key; //加密 - (NSDa...
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EncryptAndDecrypt.h
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#import <Foundation/Foundation.h>
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@class NSString;
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@interface NSData (Encryption)
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- (NSData *)AES256EncryptWithKey:(NSData *)key; //加密
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- (NSData *)AES256DecryptWithKey:(NSData *)key; //解密
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- (NSString *)newStringInBase64FromData; //追加64编码
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+ (NSString*)base64encode:(NSString*)str; //同上64编码
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+(NSData*)stringToByte:(NSString*)string;
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+(NSString*)byteToString:(NSData*)data;
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@end
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///EncryptAndDecrypt.m
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#import "EncryptAndDecrypt.h"
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#import <CommonCrypto/CommonCrypto.h>
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static char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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@implementation NSData (Encryption)
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- (NSData *)AES256EncryptWithKey:(NSData *)key //加密
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{
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//AES256加密，密钥应该是32位的
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const void * keyPtr2 = [key bytes];
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char (*keyPtr)[32] = keyPtr2;
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//对于块加密算法，输出大小总是等于或小于输入大小加上一个块的大小
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//所以在下边需要再加上一个块的大小
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NSUInteger dataLength = [self length];
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size_t bufferSize = dataLength + kCCBlockSizeAES128;
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void *buffer = malloc(bufferSize);
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size_t numBytesEncrypted = 0;
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CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
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kCCOptionPKCS7Padding/*这里就是刚才说到的PKCS7Padding填充了*/| kCCOptionECBMode,
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[key bytes], kCCKeySizeAES256,
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NULL,/* 初始化向量(可选) */
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[self bytes], dataLength,/*输入*/
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buffer, bufferSize,/* 输出 */
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&numBytesEncrypted);
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if (cryptStatus == kCCSuccess) {
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return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
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}
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free(buffer);//释放buffer
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return nil;
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}
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- (NSData *)AES256DecryptWithKey:(NSData *)key //解密
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{
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//同理，解密中，密钥也是32位的
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const void * keyPtr2 = [key bytes];
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char (*keyPtr)[32] = keyPtr2;
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//对于块加密算法，输出大小总是等于或小于输入大小加上一个块的大小
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//所以在下边需要再加上一个块的大小
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NSUInteger dataLength = [self length];
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size_t bufferSize = dataLength + kCCBlockSizeAES128;
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void *buffer = malloc(bufferSize);
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size_t numBytesDecrypted = 0;
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CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
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kCCOptionPKCS7Padding/*这里就是刚才说到的PKCS7Padding填充了*/| kCCOptionECBMode,
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keyPtr, kCCKeySizeAES256,
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NULL,/* 初始化向量(可选) */
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[self bytes], dataLength,/* 输入 */
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buffer, bufferSize,/* 输出 */
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&numBytesDecrypted);
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if (cryptStatus == kCCSuccess) {
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return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
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}
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free(buffer);
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return nil;
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}
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- (NSString *)newStringInBase64FromData //追加64编码
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{
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NSMutableString *dest = [[NSMutableString alloc] initWithString:@""];
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unsigned char * working = (unsigned char *)[self bytes];
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int srcLen = [self length];
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for (int i=0; i<srcLen; i += 3) {
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for (int nib=0; nib<4; nib++) {
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int byt = (nib == 0)?0:nib-1;
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int ix = (nib+1)*2;
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if (i+byt >= srcLen) break;
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unsigned char curr = ((working[i+byt] << (8-ix)) & 0x3F);
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if (i+nib < srcLen) curr |= ((working[i+nib] >> ix) & 0x3F);
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[dest appendFormat:@"%c", base64[curr]];
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}
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}
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return dest;
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}
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+ (NSString*)base64encode:(NSString*)str
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{
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if ([str length] == 0)
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return @"";
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const char *source = [str UTF8String];
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int strlength = strlen(source);
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char *characters = malloc(((strlength + 2) / 3) * 4);
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if (characters == NULL)
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return nil;
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NSUInteger length = 0;
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NSUInteger i = 0;
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while (i < strlength) {
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char buffer[3] = {0,0,0};
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short bufferLength = 0;
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while (bufferLength < 3 && i < strlength)
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buffer[bufferLength++] = source[i++];
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characters[length++] = base64[(buffer[0] & 0xFC) >> 2];
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characters[length++] = base64[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
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if (bufferLength > 1)
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characters[length++] = base64[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
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else characters[length++] = '=';
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if (bufferLength > 2)
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characters[length++] = base64[buffer[2] & 0x3F];
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else characters[length++] = '=';
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}
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NSString *g = [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES];
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return g;
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}
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+(NSData*)stringToByte:(NSString*)string
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{
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NSString *hexString=[[string uppercaseString] stringByReplacingOccurrencesOfString:@" " withString:@""];
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if ([hexString length]%2!=0) {
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return nil;
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}
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Byte tempbyt[1]={0};
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NSMutableData* bytes=[NSMutableData data];
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for(int i=0;i<[hexString length];i++)
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{
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unichar hex_char1 = [hexString characterAtIndex:i]; 两位16进制数中的第一位(高位*16)
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int int_ch1;
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if(hex_char1 >= '0' && hex_char1 <='9')
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int_ch1 = (hex_char1-48)*16; 0 的Ascll - 48
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else if(hex_char1 >= 'A' && hex_char1 <='F')
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int_ch1 = (hex_char1-55)*16; A 的Ascll - 65
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else
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return nil;
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i++;
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unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位)
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int int_ch2;
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if(hex_char2 >= '0' && hex_char2 <='9')
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int_ch2 = (hex_char2-48); 0 的Ascll - 48
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else if(hex_char2 >= 'A' && hex_char2 <='F')
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int_ch2 = hex_char2-55; A 的Ascll - 65
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else
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return nil;
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tempbyt[0] = int_ch1+int_ch2; ///将转化后的数放入Byte数组里
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[bytes appendBytes:tempbyt length:1];
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}
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return bytes;
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}
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+(NSString*)byteToString:(NSData*)data
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{
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Byte *plainTextByte = (Byte *)[data bytes];
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NSString *hexStr=@"";
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for(int i=0;i<[data length];i++)
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{
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NSString *newHexStr = [NSString stringWithFormat:@"%x",plainTextByte[i]&0xff];///16进制数
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if([newHexStr length]==1)
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hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
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else
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hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
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}
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return hexStr;
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}
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@end
使用
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-(void)Jiami
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{
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NSString *plainText = @"AES中国";//明文
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NSData *plainTextData = [plainText dataUsingEncoding:NSUTF8StringEncoding];
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NSString *keyStr = @"12345678901234567890123456789012";
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NSData *keyDataStr = [keyStr dataUsingEncoding:NSUTF8StringEncoding];
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NSData *cipherTextData = [plainTextData AES256EncryptWithKey:keyDataStr];
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NSString *hexStr = [NSData byteToString:cipherTextData];
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NSLog(@"密文:%@",hexStr);
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[self Jiemi:hexStr];
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}
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-(void)Jiemi:(NSString *)hexString
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{
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NSString *keyStr = @"12345678901234567890123456789012";
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NSData *keyDataStr = [keyStr dataUsingEncoding:NSUTF8StringEncoding];
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NSData *data = [NSData stringToByte:hexString];
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/
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NSData *datas = [data AES256DecryptWithKey:keyDataStr];
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NSLog([[NSString alloc]initWithData:datas encoding:NSUTF8StringEncoding]);
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}
http://blog.csdn.net/pjk1129/article/details/8489550
文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。
原文链接：zzzili.blog.csdn.net/article/details/8610060
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