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use error::ErrorStack;
use ffi;
use libc::{c_int, c_char, c_void};
use std::fmt;
use std::ptr;
use bio::MemBioSlice;
use bn::BigNumRef;
use {cvt, cvt_p};
use types::OpenSslTypeRef;
use util::{CallbackState, invoke_passwd_cb_old};
type_!(Dsa, DsaRef, ffi::DSA, ffi::DSA_free);
impl DsaRef {
private_key_to_pem!(ffi::PEM_write_bio_DSAPrivateKey);
public_key_to_pem!(ffi::PEM_write_bio_DSA_PUBKEY);
private_key_to_der!(ffi::i2d_DSAPrivateKey);
public_key_to_der!(ffi::i2d_DSAPublicKey);
pub fn size(&self) -> Option<u32> {
if self.q().is_some() {
unsafe { Some(ffi::DSA_size(self.as_ptr()) as u32) }
} else {
None
}
}
pub fn p(&self) -> Option<&BigNumRef> {
unsafe {
let p = compat::pqg(self.as_ptr())[0];
if p.is_null() {
None
} else {
Some(BigNumRef::from_ptr(p as *mut _))
}
}
}
pub fn q(&self) -> Option<&BigNumRef> {
unsafe {
let q = compat::pqg(self.as_ptr())[1];
if q.is_null() {
None
} else {
Some(BigNumRef::from_ptr(q as *mut _))
}
}
}
pub fn g(&self) -> Option<&BigNumRef> {
unsafe {
let g = compat::pqg(self.as_ptr())[2];
if g.is_null() {
None
} else {
Some(BigNumRef::from_ptr(g as *mut _))
}
}
}
pub fn has_public_key(&self) -> bool {
unsafe { !compat::keys(self.as_ptr())[0].is_null() }
}
pub fn has_private_key(&self) -> bool {
unsafe { !compat::keys(self.as_ptr())[1].is_null() }
}
}
impl Dsa {
pub fn generate(bits: u32) -> Result<Dsa, ErrorStack> {
unsafe {
let dsa = Dsa(try!(cvt_p(ffi::DSA_new())));
try!(cvt(ffi::DSA_generate_parameters_ex(dsa.0,
bits as c_int,
ptr::null(),
0,
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut())));
try!(cvt(ffi::DSA_generate_key(dsa.0)));
Ok(dsa)
}
}
private_key_from_pem!(Dsa, ffi::PEM_read_bio_DSAPrivateKey);
private_key_from_der!(Dsa, ffi::d2i_DSAPrivateKey);
public_key_from_pem!(Dsa, ffi::PEM_read_bio_DSA_PUBKEY);
public_key_from_der!(Dsa, ffi::d2i_DSAPublicKey);
#[deprecated(since = "0.9.2", note = "use private_key_from_pem_callback")]
pub fn private_key_from_pem_cb<F>(buf: &[u8], pass_cb: F) -> Result<Dsa, ErrorStack>
where F: FnOnce(&mut [c_char]) -> usize
{
ffi::init();
let mut cb = CallbackState::new(pass_cb);
let mem_bio = try!(MemBioSlice::new(buf));
unsafe {
let cb_ptr = &mut cb as *mut _ as *mut c_void;
let dsa = try!(cvt_p(ffi::PEM_read_bio_DSAPrivateKey(mem_bio.as_ptr(),
ptr::null_mut(),
Some(invoke_passwd_cb_old::<F>),
cb_ptr)));
Ok(Dsa(dsa))
}
}
}
impl fmt::Debug for Dsa {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "DSA")
}
}
#[cfg(ossl110)]
mod compat {
use std::ptr;
use ffi::{self, BIGNUM, DSA};
pub unsafe fn pqg(d: *const DSA) -> [*const BIGNUM; 3] {
let (mut p, mut q, mut g) = (ptr::null(), ptr::null(), ptr::null());
ffi::DSA_get0_pqg(d, &mut p, &mut q, &mut g);
[p, q, g]
}
pub unsafe fn keys(d: *const DSA) -> [*const BIGNUM; 2] {
let (mut pub_key, mut priv_key) = (ptr::null(), ptr::null());
ffi::DSA_get0_key(d, &mut pub_key, &mut priv_key);
[pub_key, priv_key]
}
}
#[cfg(ossl10x)]
mod compat {
use ffi::{BIGNUM, DSA};
pub unsafe fn pqg(d: *const DSA) -> [*const BIGNUM; 3] {
[(*d).p, (*d).q, (*d).g]
}
pub unsafe fn keys(d: *const DSA) -> [*const BIGNUM; 2] {
[(*d).pub_key, (*d).priv_key]
}
}
#[cfg(test)]
mod test {
use symm::Cipher;
use super::*;
#[test]
pub fn test_generate() {
Dsa::generate(1024).unwrap();
}
#[test]
pub fn test_password() {
let key = include_bytes!("../test/dsa-encrypted.pem");
Dsa::private_key_from_pem_passphrase(key, b"mypass").unwrap();
}
#[test]
fn test_to_password() {
let key = Dsa::generate(2048).unwrap();
let pem = key.private_key_to_pem_passphrase(Cipher::aes_128_cbc(), b"foobar").unwrap();
Dsa::private_key_from_pem_passphrase(&pem, b"foobar").unwrap();
assert!(Dsa::private_key_from_pem_passphrase(&pem, b"fizzbuzz").is_err());
}
#[test]
pub fn test_password_callback() {
let mut password_queried = false;
let key = include_bytes!("../test/dsa-encrypted.pem");
Dsa::private_key_from_pem_callback(key, |password| {
password_queried = true;
password[..6].copy_from_slice(b"mypass");
Ok(6)
})
.unwrap();
assert!(password_queried);
}
}