OpenSSL and RSA :: digital signature

[josecarlosmissias]

Hello! everyone,
I need to digitally sign text files, how to do this, follow my requirements:

1 - apply the MD5 one-way function only once in the entire file. The result will be a code of 128 bits or 16 ASCII characters, corresponding to a 32 digit hexadecimal number. Should be used in the calculations the hexadecimal number, considering it as a single block;

2 - create a private key of 1024 bits, equivalent to a 256-digit hexadecimal number, known only from a developer;

3 - encrypt the hex code generated as provided in Section 1, using the key referred to in item 2, the RSA public key;

4 - with the outcome of the procedure described in item 3 will retrieve a hexadecimal number with up to 256 digits to be reported in field 02 of the registry type EAD.


Can someone help me?

[wysota]

How is this related to Qt?

[josecarlosmissias]

How is this related to Qt?

In helping QT Creator 1.3.1 cites "QSSL Namespace" most do not find any example or tutorial on how to use. I believe this supports the Namaspace my requirements. Sorry if my question poorly formulated.

[wysota]

Qt uses OpenSSL only for https. If you want to use other forms of encryption, you need to use OpenSSL API directly or use one of the wrappers available for it.

[josecarlosmissias]

Qt uses OpenSSL only for https. If you want to use other forms of encryption, you need to use OpenSSL API directly or use one of the wrappers available for it.

Do you know any example or Tutorial? I would be very grateful.

[wysota]

http://www.openssl.org