iOS使用MD5 - 字符串加密至MD5&获取文件MD5

iOS 字符串加密至MD5

#import <CommonCrypto/CommonDigest.h>

+ (NSString *) md5:(NSString *)str 
{
    const char *cStr = [str UTF8String];
    unsigned char result[16];
    CC_MD5( cStr, strlen(cStr), result );
    return [NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
                           result[0], result[1], result[2], result[3], 
                           result[4], result[5], result[6], result[7],
                           result[8], result[9], result[10], result[11],
                           result[12], result[13], result[14], result[15]
  ];
}

iPhone处理大文件检测MD5的代码

+(NSString*)fileMD5:(NSString*)path
{
    NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
    if( handle== nil ) return @"ERROR GETTING FILE MD5"; // file didnt exist
 
    CC_MD5_CTX md5;
 
    CC_MD5_Init(&md5);
 
    BOOL done = NO;
    while(!done)
    {
        NSData* fileData = [handle readDataOfLength: CHUNK_SIZE ];
        CC_MD5_Update(&md5, [fileData bytes], [fileData length]);
        if( [fileData length] == 0 ) done = YES;
    }
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5_Final(digest, &md5);
    NSString* s = [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
                   digest[0], digest[1], 
                   digest[2], digest[3],
                   digest[4], digest[5],
                   digest[6], digest[7],
                   digest[8], digest[9],
                   digest[10], digest[11],
                   digest[12], digest[13],
                   digest[14], digest[15]];
    return s;
}