[erlang-questions] public_key usage...

[Peter W. Morreale]

On Mon, 2011-04-25 at 21:49 +0530, Banibrata Dutta wrote:
> On Mon, Apr 25, 2011 at 9:40 PM, Peter W. Morreale
> <pmorreale@REDACTED> wrote:
>         
>         Does anyone have some example code showing usage of
>         public_key:sign and public_key:verify()?  
>         
>         I'm having a very difficult time getting the following to
>         work: 
>                 Cert2 = "-----BEGIN CERTIFICATE-----\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\n-----END CERTIFICATE-----",
>         
>                 Text = "some text",
>         
>                 Pb = list_to_binary(Cert2),
>                 PemEntries = public_key:pem_decode(Pb),
>                 RSAPubKey = public_key:pem_entry_decode(hd(PemEntries)),
>         
>                 Msg = list_to_binary(Text),
>                 C = public_key:sign(Msg, sha, RSAPubKey),
>                 io:fwrite("sign: ~p~n", [C]),
>         
>         
>         
>         I'm generating "escript: exception error: function_clause".
>         
> 
> No first hand experience but since I'd like to do something like this
> shortly, looked around and found this thread:
> http://erlang.org/pipermail/erlang-questions/2011-January/055880.html
> Does that help ? 
> 

A little, but only in the sense that I should be using public_key:[d|
e]ncrypt_public().  

If I replace public_key:sign() with:

 C = public_key:encrypt_public(Msg, RSAPubKey), 

I get similar results.

Thanks
-PWM