NSString * md5( NSString *str )

 

const char *cStr = [str UTF8String];

 

unsigned char result[CC_MD5_DIGEST_LENGTH];

 

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]];