//
// MD5Value.h
// iOSEdu
//
// Created by littest on 16/2/26.
// Copyright © 2016年 littest. 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 littest on 16/2/26.
// Copyright © 2016年 littest. 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:@"x", 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:@"x",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:@"x",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,
"x", (
int)(digest[i]));
}
result =
CFStringCreateWithCString(kCFAllocatorDefault,
(const char *
)hash,
kCFStringEncodingUTF8);
done:
if (readStream) {
CFReadStreamClose(readStream);
CFRelease(readStream);
}
if (fileURL) {
CFRelease(fileURL);
}
return result;
}
@end
转载于:https://www.cnblogs.com/ningmengcao-ios/p/5769709.html
相关资源：MD5 C 实现 对文件计算MD5值
