Error encrypting string data

[Ralf Schneider]

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Am Freitag, 18. Juli 2003 13:20 schrieb Werner Koch:
> To convert a string into an MPI, use this:
>
>    gcry_mpi_t a;
>    int rc;
>    const char string[] =3D "Is that all you've got to show for seven "
>                          "and a half million years' work?";
>
>    rc =3D gcry_mpi_scan (&a, GCRYMPI_FMT_USG, string, strlen (string));
>    if (rc)
>       bug ("oops: mpi_scan failed: %s\n", gpg_strerror (rc));
>
>    foo (a)
>    gcry_mpi_release (a);
>

Hi Werner,

thank you very much for your code snippet. After a small correction=20
(gcry_mpi_scan expects a pointer to size_t instead of a size_t value) it=20
worked fine.

Now, I have another conversion problem :-) I want to store the keys I gener=
ate=20
with gcry_ac_key_pair_generate in a database. My idea was to encode them=20
base64 and store them in a VARCHAR field.=20

So, the problem is: How can I convert the key of type gcry_ac_key_t to a=20
representation that I can encode to a base64 string (for example a byte=20
array)?

> However, using this is not secure as proper padding is required for
> most public key algorithms; see the HAC for details.

What is the HAC? Where can I find it?

Best regards,
Ralf.
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