SHA1 hash difference between c# windows store app and Objective-c iOS -

my windows store app on surface pro uses sha1 send hashed password server. wanted same thing ios app different results , don't know why.

i tried different encoding (nsascii utf8 unicode) when converting nsstrings cstring no prevail.

c# windows store app - surface pro

/// <summary>     /// literal copy of values web config machinekey     /// </summary>     const string validationkey = "6db51f17c529ad3cabec50b3c89cb21f4f1422f58a5b42d0e8db8cb5cda146511891c1baf47f8d29401e3400267682b202b7da146511891c1baf47f8d29401e3";      public static string hmacsha1(string basestring)     {         var crypt = macalgorithmprovider.openalgorithm("hmac_sha1");         var buffer = cryptographicbuffer.createfrombytearray(encoding.unicode.getbytes(basestring));         var keybuffer = windows.security.cryptography.cryptographicbuffer.createfrombytearray(hextobyte(validationkey));         var key = crypt.createkey(keybuffer);         var sigbuffer = cryptographicengine.sign(key, buffer);         string signature = cryptographicbuffer.encodetobase64string(sigbuffer);         return signature;     }      //     // hextobyte     //   converts hexadecimal string byte array. used convert encryption     // key values configuration.     //     private static byte[] hextobyte(string hexstring)     {         byte[] returnbytes = new byte[hexstring.length / 2];         (int = 0; < returnbytes.length; i++)             returnbytes[i] = convert.tobyte(hexstring.substring(i * 2, 2), 16);         return returnbytes;     } 

objective-c ios

//hash password nsstring *secret = @"6db51f17c529ad3cabec50b3c89cb21f4f1422f58a5b42d0e8db8cb5cda146511891c1baf47f8d29401e3400267682b202b7da146511891c1baf47f8d29401e3"; nsstring *data = password; const char *ckey = [secret cstringusingencoding:nsasciistringencoding]; const char *cdata = [data cstringusingencoding:nsasciistringencoding]; unsigned char chmac[cc_sha1_digest_length]; cchmac(kcchmacalgsha1, ckey, strlen(ckey), cdata, strlen(cdata), chmac); nsdata *hmac = [[nsdata alloc] initwithbytes:chmac length:sizeof(chmac)]; nsstring *signature = [hmac base64encodedstringwithoptions:0];   nsstring *clientpassword = signature; 

so genius helped me figure out. in c# code password encoded unicode can seen in line:

encoding.unicode.getbytes(basestring) 

that means should have changed nsascii encoding line in objective-c to:

const char *cpassword = [password cstringusingencoding:nsunicodestringencoding]; 

now comes tricky. unicode encodes string 'welkom123' this: w/0e/0l/0k/0o/0m/01/02/03/0. means can't use strlen(cdata) determine length of cdata because stop counting when encountering /0, length has been wrong whole time. had replace strlen(cdata) (password.length * 2).

but outcome still not right. key had become hexadecimal data in c# code. nsdata should used create cchmac. code turns nsstring nsdata hexadecimal values:

int len = (int)([inputstring length] / 2);    // target length unsigned char *buf = malloc(len); unsigned char *whole_byte = buf; char byte_chars[3] = {'\0','\0','\0'};  int i; (i=0; < [inputstring length] / 2; i++) {     byte_chars[0] = [inputstring characteratindex:i*2];     byte_chars[1] = [inputstring characteratindex:i*2+1];     *whole_byte = strtol(byte_chars, null, 16);     whole_byte++; }  nsdata *data = [nsdata datawithbytes:buf length:len]; free( buf ); return data; 

in end total code this:

-(nsdictionary *)authenticatewithusername:(nsstring *)username andpassword:(nsstring *)password andsyncurl:(nsstring *)syncurl { nsstring *key = @"6db51f17c529ad3cabec50b3c89cb21f4f1422f58a5b42d0e8db8cb5cda146511891c1baf47f8d29401e3400267682b202b7da146511891c1baf47f8d29401e3"; nsdata *data = [self stringtohexdata:key]; const char *cpassword = [password cstringusingencoding:nsunicodestringencoding]; unsigned char chmac[cc_sha1_digest_length]; cchmac(kcchmacalgsha1, data.bytes, data.length, cpassword, (password.length * 2), chmac); nsdata *hmac = [[nsdata alloc] initwithbytes:chmac length:sizeof(chmac)]; nsstring *hashedpassword = [hmac base64encodedstringwithoptions:0];  nsstring *clientpassword = hashedpassword;  // code here left out readability sake  return dict; }  - (nsdata *) stringtohexdata:(nsstring *)inputstring { int len = (int)([inputstring length] / 2);    // target length unsigned char *buf = malloc(len); unsigned char *whole_byte = buf; char byte_chars[3] = {'\0','\0','\0'};  int i; (i=0; < [inputstring length] / 2; i++) {     byte_chars[0] = [inputstring characteratindex:i*2];     byte_chars[1] = [inputstring characteratindex:i*2+1];     *whole_byte = strtol(byte_chars, null, 16);     whole_byte++; }  nsdata *data = [nsdata datawithbytes:buf length:len]; free( buf ); return data; }