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RE: Workaround in 0.6.0


Thanks for the quick reply.  For details on the "b" mode of fopen, please see:



With the mode specifiers above the file is open as a text file. In order to open a file as a binary file, a "b" character has to be included in the mode string. This additional "b" character can either be appended at the end of the string (thus making the following compound modes: "rb", "wb", "ab", "r+b", "w+b", "a+b") or be inserted between the letter and the "+" sign for the mixed modes ("rb+", "wb+", "ab+").

For a reference to our reasoning for opening the file as binary:


(see the answer)

If there may be any inconsistencies or oversights with this solution, please let me know.



-----Original Message-----
From: Andreas Schneider [mailto:asn@xxxxxxxxxxxxxx]
Sent: Thursday, August 23, 2012 10:27 AM
To: libssh@xxxxxxxxxx
Subject: Re: Workaround in 0.6.0

On Thursday 23 August 2012 06:59:43 you wrote:

> Hello,


> Wanted to point out the following to the LibSSH group.


> My colleague and I were able to successfully build LibSSH 0.6.0 with a

> few adjustments to the build project.  However, when we attempted to

> utilize the library, we were receiving errors on attempts to authorize

> with a private key.  After much digging around and debugging, we were

> able to find out that the following conditionals were failing:


> ssh_pki_import_privkey_file


>     if (size != sb.st_size) {


> ssh_pki_import_pubkey_file


>     if (size != sb.st_size) {


> We found that the difference was only one byte in length.  After some

> research, we realized that the newline in our private key file was

> being counted as 2 bytes (\r\n) in the following function:


>     rc = stat(filename, &sb);


> However, the following:


>     size = fread(key_buf, 1, sb.st_size, file);


> Was counting the newline as one byte.  In order to solve this issue,

> we simply opened the file with the "binary" option included:


>     file = fopen(filename, "rb");

b is a mode from the windows function?

I don't see it in the linux manpage but adding it doesn't result in an error.

I think we're fine adding it.

                -- andreas


Andreas Schneider                   GPG-ID: F33E3FC6

www.cryptomilk.org<http://www.cryptomilk.org>                asn@xxxxxxxxxxxxxx<mailto:asn@xxxxxxxxxxxxxx>

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