//
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// Copyright © 2018年 dahua. All rights reserved.
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//
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#import "NSData+SHA256.h"
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#import <CommonCrypto/CommonDigest.h>
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#import <CommonCrypto/CommonCrypto.h>
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@implementation NSData (SHA256)
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- (NSData *)lc_SHA256Data
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{
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const char *cstr = [self bytes];
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NSData *data = [NSData dataWithBytes:cstr length:self.length];
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uint8_t digest[CC_SHA256_DIGEST_LENGTH];
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CC_SHA256(data.bytes, (CC_LONG)data.length, digest);
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NSData *result = [NSData dataWithBytes:digest length:CC_SHA256_DIGEST_LENGTH];
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return result;
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}
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- (NSData *)reverseData {
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const char *bytes = [self bytes];
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int idx = (int)[self length] - 1;
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char *reversedBytes = calloc(sizeof(char),[self length]);
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for (int i = 0; i < [self length]; i++) {
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reversedBytes[idx--] = bytes[i];
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}
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NSData *reversedData = [NSData dataWithBytes:reversedBytes length:[self length]];
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free(reversedBytes);
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return reversedData;
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}
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- (NSString *)data2Str
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{
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NSData *data = self;
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if (!data || [data length] == 0) {
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return @"";
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}
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NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];
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[data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
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unsigned char *dataBytes = (unsigned char*)bytes;
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for (NSInteger i = 0; i < byteRange.length; i++) {
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NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
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if ([hexStr length] == 2) {
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[string appendString:hexStr];
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} else {
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[string appendFormat:@"0%@", hexStr];
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}
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}
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}];
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return string;
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}
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- (NSData *)AES256CBCOperation:(uint32_t)operation keyData:(NSData *)key ivData:(NSData *)iv
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{
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char keyPtr[kCCKeySizeAES256 + 1];
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bzero(keyPtr, sizeof(keyPtr));
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const void* tempkey = [key bytes];
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NSLog(@"%ld", strlen(tempkey));
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memcpy(keyPtr,tempkey,kCCKeySizeAES256);
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// IV
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char ivPtr[kCCBlockSizeAES128 + 1];
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bzero(ivPtr, sizeof(ivPtr));
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memcpy(ivPtr,[iv bytes],kCCBlockSizeAES128);
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size_t bufferSize = [self length] + kCCBlockSizeAES128;
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void *buffer = malloc(bufferSize);
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size_t numBytesEncrypted = 0;
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CCCryptorStatus cryptorStatus = CCCrypt(operation, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, ivPtr, [self bytes], [self length], buffer, bufferSize, &numBytesEncrypted);
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if(cryptorStatus == kCCSuccess)
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{
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NSLog(@"AES256operation Success %u", operation);
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return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
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}else
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{
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NSLog(@"AES256operation Error %u", operation);
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}
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free(buffer);
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return nil;
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}
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//将NSString转换成十六进制的字符串则可使用如下方式:
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- (NSString *)lc_convertToHexString {
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if (self == nil) {
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return nil;
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}
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NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[self length]];
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[self enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
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unsigned char *dataBytes = (unsigned char*)bytes;
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for (NSInteger i = 0; i < byteRange.length; i++) {
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NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
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if ([hexStr length] == 2) {
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[string appendString:hexStr];
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} else {
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[string appendFormat:@"0%@", hexStr];
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}
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}
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}];
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return string;
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}
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@end
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