-compatibility with the MIT Kerberos library. DES_read_pw_string()
-is also available under the name EVP_read_pw_string().
-
-DES_read_pw_string() writes the string specified by I<prompt> to
-standard output, turns echo off and reads in input string from the
-terminal. The string is returned in I<buf>, which must have space for
-at least I<length> bytes. If I<verify> is set, the user is asked for
-the password twice and unless the two copies match, an error is
-returned. A return code of -1 indicates a system error, 1 failure due
-to use interaction, and 0 is success.
-
-DES_read_password() does the same and converts the password to a DES
-key by calling DES_string_to_key(); DES_read_2password() operates in
-the same way as DES_read_password() except that it generates two keys
-by using the DES_string_to_2key() function. DES_string_to_key() is
-available for backward compatibility with the MIT library. New
-applications should use a cryptographic hash function. The same
-applies for DES_string_to_2key().