iOS的3DES加密写法

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加密

+ (NSString *)encrypt3DES:(NSString *)src key:(NSString *)key{

constvoid *vplainText;

size_t plainTextBufferSize;

NSData* data = [srcdataUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

plainTextBufferSize = [data length];

vplainText = (constvoid *)[data bytes];

CCCryptorStatus ccStatus;

uint8_t *bufferPtr =NULL;

size_t bufferPtrSize =0;

size_t movedBytes =0;

bufferPtrSize = (plainTextBufferSize + kCCBlockSizeDES) & ~(kCCBlockSizeDES -1);

bufferPtr = malloc( bufferPtrSize *sizeof(uint8_t));

memset((void *)bufferPtr,0x0, bufferPtrSize);

constvoid *vkey = (constvoid *)[key UTF8String];

ccStatus = CCCrypt(kCCEncrypt,

kCCAlgorithmDES,

kCCOptionPKCS7Padding |kCCOptionECBMode,

vkey,

kCCKeySizeDES,

nil,

vplainText,

plainTextBufferSize,

(void *)bufferPtr,

bufferPtrSize,

&movedBytes);

NSData *myData = [NSDatadataWithBytes:(constvoid *)bufferPtr length:(NSUInteger)movedBytes];

return [selfNSDataToHexString:myData];

}

解密

+ (NSString *)decrypt3DES:(NSString *)src key:(NSString *)key{

constvoid *vplainText;

size_t plainTextBufferSize;

NSData *EncryptData = [selfhexStrToNSData:src];

plainTextBufferSize = [EncryptData length];

vplainText = [EncryptData bytes];

CCCryptorStatus ccStatus;

uint8_t *bufferPtr =NULL;

size_t bufferPtrSize =0;

size_t movedBytes =0;

bufferPtrSize = (plainTextBufferSize + kCCBlockSizeDES) & ~(kCCBlockSizeDES -1);

bufferPtr = malloc( bufferPtrSize *sizeof(uint8_t));

memset((void *)bufferPtr,0x0, bufferPtrSize);

constvoid *vkey = (constvoid *)[key UTF8String];

ccStatus = CCCrypt(kCCDecrypt,

kCCAlgorithmDES,

kCCOptionPKCS7Padding |kCCOptionECBMode,

vkey,

kCCKeySizeDES,

nil,

vplainText,

plainTextBufferSize,

(void *)bufferPtr,

bufferPtrSize,

&movedBytes);

NSData *dataBuf = [NSDatadataWithBytes:(constvoid *)bufferPtr length:(NSUInteger)movedBytes];

return [[NSStringalloc] initWithData:dataBuf

encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)]

;

}

//十六进制字符串转化为二进制

- (NSData *)hexStrToNSData:(NSString *)hexStr{

NSMutableData* data = [NSMutableDatadata];

for (int i =0; i+2 <= hexStr.length; i+=2) {

NSRange range =NSMakeRange(i, 2);

NSString* ch = [hexStrsubstringWithRange:range];

NSScanner* scanner = [NSScannerscannerWithString:ch];

unsignedint intValue;

[scanner scanHexInt:&intValue];

[data appendBytes:&intValuelength:1];

}

return data;

}

//二进制转化为十六进制

- (NSString *)NSDataToHexString:(NSData *)data{

if (data ==nil) {

returnnil;

}

NSMutableString* hexString = [NSMutableStringstring];

constunsigned char *p = [databytes];

for (int i=0; i < [datalength]; i++) {

[hexString appendFormat:@"%02x", *p++];

}

return [hexStringuppercaseString];

}

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