iOS - 获取文件MD5 ：

最新推荐文章于 2022-04-03 17:03:09 发布

原创最新推荐文章于 2022-04-03 17:03:09 发布 · 3.2k 阅读

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#MD5 #文件MD5

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本文介绍如何使用Objective-C编程语言通过指定路径创建并计算文件的MD5哈希值，包括导入必要的头文件、实现核心计算逻辑及最终结果输出。

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1.首先导入头文件：

#include <CommonCrypto/CommonDigest.h>

2.具体实现方法.

CFStringRef FileMD5HashCreateWithPath(CFStringRef filePath) {
    
    // Declare needed variables
    CFStringRef result = NULL;
    CFReadStreamRef readStream = NULL;
    
    // Get the file URL
    CFURLRef fileURL =
    CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
                                  (CFStringRef)filePath,
                                  kCFURLPOSIXPathStyle,
                                  (Boolean)false);
    if (!fileURL) goto done;
    
    // Create and open the read stream
    readStream = CFReadStreamCreateWithFile(kCFAllocatorDefault,
                                            (CFURLRef)fileURL);
    if (!readStream) goto done;
    bool didSucceed = (bool)CFReadStreamOpen(readStream);
    if (!didSucceed) goto done;
    
    // Initialize the hash object
    CC_MD5_CTX hashObject;
    CC_MD5_Init(&hashObject);
    
    
    // Feed the data to the hash object
    bool hasMoreData = true;
    while (hasMoreData) {
        uint8_t buffer[4096];
        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);
    }
    
    NSLog(@"MD5// %@",result);
    
    return result;
}

3.实现此方法：

FileMD5HashCreateWithPath((__bridge CFStringRef)([[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"test.txt.zip"]));