/* * Creates a MD5 based hash of a password * * To validate a entered password, use the previously calculated * password hash as salt, and then compare the result. If identical * then the password matches. * * While encoding a password the salt should be 8 randomly selected * characters from the base64 alphabet, for example generated as follows: *    char salt[9]; *    to64(salt, rand(), 4); *    to64(salt+4, rand(), 4); *    salt[0] = '\0'; */char *crypt_md5(const char *pw, const char *salt);/* MD5 hash without salt */char *md5sum(const char *s);