[openssl-users] base64 decode in C

[Prashant Bapat]

Hi,

My problem is if the string that I want to decode start with null
terminated char (as in a SSH pubkey), the base64_decode does not return
anything at all. The encoded string itself does not have null terminated
chars but rather the decoded result. The "buffer" being returned is empty.
How to overcome this ?

Also my C is relatively rusty, it would be great help if someone could look
look at my code and suggest what I'm doing wrong.

Also, I tried to use the EVP_DecodeBlock function with same result. It
decodes everything except the SSH pubkey.

Thanks.
--Prashant

On 18 March 2015 at 22:56, Scott Neugroschl <scott_n at xypro.com> wrote:

>  I believe the SSH pubkey is binary data, not ASCII, so strlen() will not
> work on it if it has embedded NUL chars.
>
> As Dave Thompson suggested, instead of strlen(), use the length returned
> from BIO_read.
>
>
>
>
>
> *From:* openssl-users [mailto:openssl-users-bounces at openssl.org] *On
> Behalf Of *Prashant Bapat
> *Sent:* Wednesday, March 18, 2015 8:08 AM
> *To:* openssl-users
> *Subject:* Re: [openssl-users] base64 decode in C
>
>
>
> Hi Dave and Walter,
>
>
>
> Thanks for our reply.
>
>
>
> I'm not doing anything different for the ssh pubkey. I'm able to decode it
> using the "openssl enc -base64 -d -A" command. But not using the C program.
>
>
>
> Attaching my entire code here. After getting the base64 decoded I'm
> calculating the MD5 sum and printing it. This works for a regular string
> but not for SSH pubkey.
>
>
>
> Thanks again.
>
>
>
> --Prashant
>
>
>
> On 18 March 2015 at 18:04, Walter H. <Walter.H at mathemainzel.info> wrote:
>
> Hi,
>
> before calling this function,
> remove any whitespace;
>
> Walter
>
>
>
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