iPhone MD5

#import <CommonCrypto/CommonDigest.h>

- (NSString *)uniqueIDFromString:(NSString *)source

{

const char *src = [[source lowercaseString] UTF8String];

unsigned char result[CC_MD5_DIGEST_LENGTH];

CC_MD5(src, strlen(src), result);

NSString *ret = [[[NSString alloc] initWithFormat:@"%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]

  ] autorelease];

return ret;

}