Compile gcrypt for Vala - c

Question

I'm try to compile a code write in Vala using a .vapi of libgcrypt.
I installed the library in the system and i run a test in c. The code write in C compiles without errors:
I typed the following command to compile the C code:
gcc -o main main.c -l gcrypt
The code runs perfectly.
But, the following code write in Vala don't compile using the command:
valac --pkg gcrypt --Xcc=-lgcrypt main.vala
The main.vala is
using GCrypt;
public static int main(string[] args)
{
Hash h;
Hash.open(out h, Hash.Algorithm.MD5, Hash.Flag.SECURE);
return 0;
}
I don't know what i doing wrong.
EDITED:
Sorry for not post the error, but there is:
Loaded package /usr/share/vala-0.30/vapi/glib-2.0.vapi'
Loaded package /usr/share/vala-0.30/vapi/gobject-2.0.vapi'
Loaded package /usr/share/vala-0.30/vapi/gcrypt.vapi'
cc -o '/home/kyul/Documents/Codes/Vala/test_gcrypt/main' '/home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c' -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lgobject-2.0 -lglib-2.0 '-lgcrypt'
/home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c: In function ‘_vala_main’:
/home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c:22:38: error: ‘GCRY_MD_FLAGSECURE’ undeclared (first use in this function)
gcry_md_open (&_tmp0_, GCRY_MD_MD5, GCRY_MD_FLAGSECURE);
^
/home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c:22:38: note: each undeclared identifier is reported only once for each function it appears in
error: cc exited with status 256
Compilation failed: 1 error(s), 0 warning(s)

Answer 1

Most likely You are missing the .vapi file.
$ wget https://raw.githubusercontent.com/nemequ/vala-extra-vapis/master/gcrypt.vapi
$ patch < gcrypt.patch
$ valac --vapidir=. --pkg gcrypt --Xcc=-lgcrypt main.vala
$ ./main
$ echo $?
0
I've never used gcrypt api from vala before and had to patch gcrypt.vapi for Your example to work, but the patch is trivial:
--- gcrypt.vapi
+++ gcrypt.vapi
## -619,7 +619,7 ##
public Error get_oid (uchar[] buffer);
}
- [CCode (cname = "enum gcry_md_flags", cprefix = "GCRY_MD_FLAG")]
+ [CCode (cname = "enum gcry_md_flags", cprefix = "GCRY_MD_FLAG_")]
public enum Flag {
SECURE,
HMAC
Update: concerning Your cipher errors, obviously the Cipher class is missing free_function mapping:
--- a/gcrypt.vapi 2016-02-22 21:40:34.458977385 +0200
+++ b/gcrypt.vapi 2016-02-22 21:39:59.662976449 +0200
## -560,7 +560,7 ##
CBC_MAC /* Enable CBC message auth. code (MAC). */
}
[Compact]
- [CCode (cname = "gcry_cipher_hd_t", lower_case_cprefix = "gcry_cipher_")]
+ [CCode (cname = "struct gcry_cipher_handle", lower_case_cprefix = "gcry_cipher_", free_function = "gcry_cipher_close")]
public class Cipher {
public static Error open (out Cipher cipher, Algorithm algo, Mode mode, Flag flags);
public void close ();