based on public PR

PR: sfackler#2077
issue: sfackler#2059

It works!

fmt

openssl-sys/build/run_bindgen.rs

@@ -32,6 +32,7 @@ const INCLUDES: &str = "
 #include <openssl/sha.h>
 #include <openssl/ssl.h>
 #include <openssl/stack.h>
+#include <openssl/store.h>
 #include <openssl/x509.h>
 #include <openssl/x509_vfy.h>
 #include <openssl/x509v3.h>

openssl-sys/src/handwritten/mod.rs

@@ -29,6 +29,7 @@ pub use self::sha::*;
 pub use self::srtp::*;
 pub use self::ssl::*;
 pub use self::stack::*;
+pub use self::store::*;
 pub use self::tls1::*;
 pub use self::types::*;
 pub use self::x509::*;
@@ -66,6 +67,7 @@ mod sha;
 mod srtp;
 mod ssl;
 mod stack;
+mod store;
 mod tls1;
 mod types;
 mod x509;

openssl-sys/src/handwritten/store.rs

@@ -0,0 +1,35 @@
+use super::super::*;
+use libc::*;
+
+pub enum OSSL_STORE_CTX {}
+
+pub enum OSSL_STORE_INFO {}
+
+pub const OSSL_STORE_INFO_PUBKEY: c_int = 3;
+pub const OSSL_STORE_INFO_PKEY: c_int = 4;
+pub const OSSL_STORE_INFO_CERT: c_int = 5;
+pub const OSSL_STORE_INFO_CRL: c_int = 6;
+
+extern "C" {
+    pub fn OSSL_STORE_open(
+        uri: *const c_char,
+        // const UI_METHOD *ui_method,
+        ui_method: *const c_void,
+        ui_data: *const c_void,
+        // OSSL_STORE_post_process_info_fn post_process,
+        post_process: *const c_void,
+        post_process_data: *const c_void,
+    ) -> *mut OSSL_STORE_CTX;
+
+    pub fn OSSL_STORE_load(ctx: *mut OSSL_STORE_CTX) -> *mut OSSL_STORE_INFO;
+
+    pub fn OSSL_STORE_INFO_get_type(store_info: *mut OSSL_STORE_INFO) -> c_int;
+
+    pub fn OSSL_STORE_INFO_get1_PUBKEY(store_info: *mut OSSL_STORE_INFO) -> *mut EVP_PKEY;
+
+    pub fn OSSL_STORE_INFO_get1_PKEY(store_info: *mut OSSL_STORE_INFO) -> *mut EVP_PKEY;
+
+    pub fn OSSL_STORE_INFO_free(store_info: *mut OSSL_STORE_INFO);
+
+    pub fn OSSL_STORE_close(ctx: *mut OSSL_STORE_CTX) -> c_int;
+}

openssl/src/lib.rs

@@ -184,6 +184,7 @@ pub mod sign;
 pub mod srtp;
 pub mod ssl;
 pub mod stack;
+pub mod store;
 pub mod string;
 pub mod symm;
 pub mod version;

openssl/src/store.rs

@@ -0,0 +1,51 @@
+use foreign_types::ForeignType;
+
+use std::ffi::CString;
+use std::ptr;
+
+use crate::cvt_p;
+use crate::error::ErrorStack;
+use crate::pkey::{PKey, Private};
+
+pub struct Store(*mut ffi::OSSL_STORE_CTX);
+
+impl Drop for Store {
+    fn drop(&mut self) {
+        unsafe {
+            ffi::OSSL_STORE_close(self.0);
+        }
+    }
+}
+
+impl Store {
+    pub fn private_key_from_uri(uri: &str) -> Result<Option<PKey<Private>>, ErrorStack> {
+        let uri = CString::new(uri).unwrap();
+        unsafe {
+            let store = cvt_p(ffi::OSSL_STORE_open(
+                uri.as_ptr(),
+                ptr::null(),
+                ptr::null(),
+                ptr::null(),
+                ptr::null(),
+            ))
+            .map(|p| Store(p))?;
+
+            let mut store_info = cvt_p(ffi::OSSL_STORE_load(store.0))?;
+
+            while store_info != ptr::null_mut() {
+                let type_ = ffi::OSSL_STORE_INFO_get_type(store_info);
+                if type_ == ffi::OSSL_STORE_INFO_PKEY {
+                    let pkey_ptr = cvt_p(ffi::OSSL_STORE_INFO_get1_PKEY(store_info))?;
+                    return Ok(Some(PKey::from_ptr(pkey_ptr)));
+                }
+
+                ffi::OSSL_STORE_INFO_free(store_info);
+
+                store_info = cvt_p(ffi::OSSL_STORE_load(store.0))?;
+            }
+
+            // error?
+            Ok(None)
+        }
+    }
+}