Calculate MD5 Value

////MD5Value.h//iosedu////Created by Littest on 16/2/26.//copyright©2016 year littest. All rights reserved.//#import<Foundation/Foundation.h>#import<CommonCrypto/CommonDigest.h>#defineFilehashdefaultchunksizeforreadingdata 1024*8//8K@interfaceMd5value:nsobject//calculates the MD5 value of a nsdata+ (nsstring*) Getmd5withdata: (nsdata*) data;//computes the MD5 value of the string,+ (nsstring*) getmd5withstring: (nsstring*)string;//calculate the MD5 value of a large file+ (nsstring*) Getfilemd5withpath: (nsstring*) path;@end

////MD5VALUE.M//iosedu////Created by Littest on 16/2/26.//copyright©2016 year littest. All rights reserved.//#import "MD5Value.h"@implementationMd5value+ (nsstring*) getmd5withstring: (NSString *)string{        Const Char* original_str=[stringutf8string]; unsignedCharDigist[cc_md5_digest_length];//cc_md5_digest_length =cc_md5 (Original_str, strlen (ORIGINAL_STR), digist); Nsmutablestring* Outputstr = [nsmutablestring stringwithcapacity:Ten];  for(inti =0; i<cc_md5_digest_length;i++) {[Outputstr AppendFormat:@"%02x", Digist[i]];//lowercase x indicates that the output is lowercase MD5, and uppercase x indicates that the output is uppercase MD5            }        return[Outputstr lowercasestring]; }+ (nsstring*) Getmd5withdata: (NSData *) data{Const Char* Original_str = (Const Char*) [data bytes]; unsignedCharDigist[cc_md5_digest_length];//cc_md5_digest_length =cc_md5 (Original_str, strlen (ORIGINAL_STR), digist); Nsmutablestring* Outputstr = [nsmutablestring stringwithcapacity:Ten];  for(inti =0; i<cc_md5_digest_length;i++) {[Outputstr AppendFormat:@"%02x", Digist[i]];//lowercase x indicates that the output is lowercase MD5, and uppercase x indicates that the output is uppercase MD5            }                //You can also define a byte array to receive the computed MD5 value//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 variablescfstringref Result=NULL; Cfreadstreamref Readstream=NULL; //Get the file URLcfurlref FileURL=Cfurlcreatewithfilesystempath (Kcfallocatordefault,                                                                    (cfstringref) FilePath, Kcfurlposixpathstyle, (Boolean)false);        Cc_md5_ctx Hashobject; BOOLHasmoredata =true; BOOLDidsucceed; if(!fileurl)GotoDone ; //Create and open the read streamReadstream=Cfreadstreamcreatewithfile (Kcfallocatordefault,        (cfurlref) FileURL); if(!readstream)GotoDone ; Didsucceed= (BOOL) Cfreadstreamopen (Readstream); if(!didsucceed)GotoDone ; //Initialize the hash objectCc_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) /c6>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 succeededDidsucceed= !Hasmoredata; //Compute the Hash digestunsignedCharDigest[cc_md5_digest_length]; Cc_md5_final (Digest,&hashobject); //Abort If the read operation failed        if(!didsucceed)GotoDone ; //Compute The string result        Charhash[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); }        returnresult; }@end

Calculate MD5 Value