Add X509_NAME_hash_ex to X509NameRef

Add the ability to call X509_NAME_hash_ex so that we can also get hashes
from issuer names, and not just X509 Certificate subject names.

Author: oscarh

openssl-sys/src/handwritten/x509.rs

@@ -285,6 +285,13 @@ extern "C" {
 
     pub fn X509_NAME_new() -> *mut X509_NAME;
     pub fn X509_NAME_cmp(x: *const X509_NAME, y: *const X509_NAME) -> c_int;
+    #[cfg(ossl300)]
+    pub fn X509_NAME_hash_ex(
+        x: *const X509_NAME,
+        ctx: *mut OSSL_LIB_CTX,
+        propq: *const c_char,
+        ok: *mut c_int,
+    ) -> c_ulong;
     pub fn X509_NAME_free(x: *mut X509_NAME);
 
     pub fn X509_new() -> *mut X509;

openssl/src/x509/mod.rs

@@ -31,6 +31,7 @@ use crate::conf::ConfRef;
 use crate::error::ErrorStack;
 use crate::ex_data::Index;
 use crate::hash::{DigestBytes, MessageDigest};
+use crate::lib_ctx::LibCtxRef;
 use crate::nid::Nid;
 use crate::pkey::{HasPrivate, HasPublic, PKey, PKeyRef, Public};
 use crate::ssl::SslRef;
@@ -1218,6 +1219,34 @@ impl Stackable for X509Name {
 }
 
 impl X509NameRef {
+    /// Returns the hash of the X509 name
+    #[corresponds(X509_NAME_hash)]
+    pub fn hash(&self, ctx: Option<LibCtxRef>, propq: Option<&str>) -> Result<u32, ErrorStack> {
+        let ctx_ref = ctx.map_or(ptr::null_mut(), |ctx| ctx.as_ptr());
+
+        let cstr;
+        let propq = if let Some(propq) = propq {
+            cstr = CString::new(propq).unwrap();
+            cstr.as_ptr()
+        } else {
+            ptr::null()
+        };
+
+        let mut ok: c_int = 0;
+        let hash;
+
+        #[allow(clippy::unnecessary_cast)]
+        unsafe {
+            hash = ffi::X509_NAME_hash_ex(self.as_ptr(), ctx_ref, propq, &mut ok) as u32;
+        }
+
+        if ok != 1 {
+            return Err(ErrorStack::get());
+        }
+
+        Ok(hash)
+    }
+
     /// Returns the name entries by the nid.
     pub fn entries_by_nid(&self, nid: Nid) -> X509NameEntries<'_> {
         X509NameEntries {