[erlang-questions] public_key:pem_decode/1 and public_key:verify/4

[Joakim G.]

Thanks, I see.

I'm using keys as defined in:
https://gitweb.torproject.org/tor.git?a=blob_plain;hb=HEAD;f=doc/spec/tor-spec.txt

That is:

"For a public-key cipher, we use RSA with 1024-bit keys and a fixed
exponent of 65537.  We use OAEP-MGF1 padding, with SHA-1 as its digest
function.  We leave the optional "Label" parameter unset. (For OAEP
padding, see ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf)"

I only have the public keys to work with. Not a surprise. :-)

I will see if I can find more info on this.

Cheers
/Jocke

On 2011-01-19 14:21, Ingela Andin wrote:
> Hi!
> 
> All possible PEM-types are not supported by public_key, the currently
> supported types are mainly a result of what we need
> for the ssl-application. More types may of course be added if there is
> a need. You are welcome to contribute PEM-types that may be of common
> use.
> 
> If you want the public part of your own rsa-key it is included in the
> private-key and you can  decode that file with public_key and
> pick out the public part.
> 
> Regards Ingela Erlang/OTP team - Ericsson AB
> 
> 
> 2011/1/19 caox <caox@REDACTED>:
>> Maybe the asn1 type of your key file is not supported by public_key.  You can check it and use openssl to convert the key format.
>>
>> 在 2011-1-19，下午5:23， Joakim G. 写道：
>>
>>> Hi all,
>>> It seems that public_key:pem_decode/1 can't decode public
>>> keys.
>>>
>>> I wanted use public_key:verify/4 to verify a digital signature
>>> and for that I used public_key:pem_decode/1 to extract the
>>> public key.
>>>
>>> 26> {ok, Bin} = file:read_file("key.pub").
>>> {ok,<<"-----BEGIN RSA PUBLIC
>>> KEY-----\nMIGJAoGBAKhhZ8RrKaA0RWhjXJlSpTHd7/h6Luww9qeyUkEqBQyiCooZZGCYNle5C9TfRVJDUuxz"...>>}
>>> 27> rp(Bin).
>>> <<"-----BEGIN RSA PUBLIC
>>> KEY-----\nMIGJAoGBAKhhZ8RrKaA0RWhjXJlSpTHd7/h6Luww9qeyUkEqBQyiCooZZGCYNle5\nC9TfRVJDUuxzigvXuTh0tlba+9AyIe2hxAztjs43pSKy5VnnJlSjMBVDay8XmNjh\nlUxid/ZV2hDkKlwHDCnZjdZpeXqdtGbZ7o3N7wOBzJSRQ7kqzQHXAgMBAAE=\n-----END
>>> RSA PUBLIC KEY-----\n">>
>>> ok
>>> 28> public_key:pem_decode(Bin).
>>> []
>>>
>>> That was a surprise.
>>>
>>> Cheers
>>> /Jocke
>>>
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