//
// MD5Value.h
// iOSEdu
//
// Created by ninglihuan on 16/2/26.
// Copyright © 2016年 ninglihuan. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonDigest.h>
#define FileHashDefaultChunkSizeForReadingData 1024*8 // 8K
@interface MD5Value : NSObject
// 计算 NSData 的 MD5 值
+(NSString*)getMD5WithData:(NSData*)data;
// 计算字符串的 MD5 值，
+(NSString*)getmd5WithString:(NSString*)string;
// 计算大文件的 MD5 值
+(NSString*)getFileMD5WithPath:(NSString*)path;
@end
// MD5Value.m
// iOSEdu //
// Created by ninglihuan on 16/2/26.
// Copyright © 2016年 ninglihuan. All rights reserved. //
#import "MD5Value.h"
@implementation MD5Value
+ (NSString*)getmd5WithString:(NSString *)string { const char* original_str=[string UTF8String];
unsigned char digist[CC_MD5_DIGEST_LENGTH]; //CC_MD5_DIGEST_LENGTH = 16
CC_MD5(original_str, strlen(original_str), digist);
NSMutableString* outPutStr = [NSMutableString stringWithCapacity:10]; for(int i =0; i<CC_MD5_DIGEST_LENGTH;i++){
[outPutStr appendFormat:@"%02x", digist[i]];// 小写 x 表示输出的是小写 MD5 ，大写 X 表示输出的是大写 MD5
} return [outPutStr lowercaseString];
}
+ (NSString*)getMD5WithData:(NSData *)data{ const char* original_str = (const char *)[data bytes];
unsigned char digist[CC_MD5_DIGEST_LENGTH]; //CC_MD5_DIGEST_LENGTH = 16
CC_MD5(original_str, strlen(original_str), digist);
NSMutableString* outPutStr = [NSMutableString stringWithCapacity:10]; for(int i =0; i<CC_MD5_DIGEST_LENGTH;i++){
[outPutStr appendFormat:@"%02x",digist[i]];// 小写 x 表示输出的是小写 MD5 ，大写 X 表示输出的是大写 MD5
}
// 也可以定义一个字节数组来接收计算得到的 MD5 值
// Byte byte[16];
// CC_MD5(original_str, strlen(original_str), byte);
// NSMutableString* outPutStr = [NSMutableString stringWithCapacity:10];
// for(int i = 0; i<CC_MD5_DIGEST_LENGTH;i++){
// [outPutStr appendFormat:@"%02x",byte[i]];
// }
// [temp release];
return [outPutStr lowercaseString];
}
+(NSString*)getFileMD5WithPath:(NSString*)path
{ return (__bridge NSString *)FileMD5HashCreateWithPath((__bridge CFStringRef)path,FileHashDefaultChunkSizeForReadingData);
}
CFStringRef FileMD5HashCreateWithPath(CFStringRef filePath,
size_t chunkSizeForReadingData) {
// Declare needed variables
CFStringRef result = NULL;
CFReadStreamRef readStream = NULL;
// Get the file URL
CFURLRef fileURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
(CFStringRef)filePath,
kCFURLPOSIXPathStyle,
(Boolean)false);
CC_MD5_CTX hashObject; bool hasMoreData = true; bool didSucceed; if (!fileURL) goto done;
// Create and open the read stream
readStream = CFReadStreamCreateWithFile(kCFAllocatorDefault,
(CFURLRef)fileURL); if (!readStream) goto done;
didSucceed = (bool)CFReadStreamOpen(readStream); if (!didSucceed) goto done;
// Initialize the hash object
CC_MD5_Init(&hashObject);
// Make sure chunkSizeForReadingData is valid
if (!chunkSizeForReadingData) {
chunkSizeForReadingData = FileHashDefaultChunkSizeForReadingData;
} // Feed the data to the hash object
while (hasMoreData) {
uint8_t buffer[chunkSizeForReadingData];
CFIndex readBytesCount = CFReadStreamRead(readStream,
(UInt8 *)buffer,
(CFIndex)sizeof(buffer)); if (readBytesCount == -1)break; if (readBytesCount == 0) {
hasMoreData =false; continue;
}
CC_MD5_Update(&hashObject,(const void *)buffer,(CC_LONG)readBytesCount);
} // Check if the read operation succeeded
didSucceed = !hasMoreData; // Compute the hash digest
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5_Final(digest, &hashObject); // Abort if the read operation failed
if (!didSucceed) goto done; // Compute the string result
char hash[2 *sizeof(digest) + 1]; for (size_t i =0; i < sizeof(digest); ++i) {
snprintf(hash + (2 * i),3, "%02x", (int)(digest[i]));
}
result = CFStringCreateWithCString(kCFAllocatorDefault,
(const char *)hash,
kCFStringEncodingUTF8);
done: if (readStream) {
CFReadStreamClose(readStream);
CFRelease(readStream);
} if (fileURL) {
CFRelease(fileURL);
} return result;
} @end
