Add public key PEM read function.

openssl-sys/src/lib.rs

@@ -485,6 +485,8 @@ extern "C" {
                              user_data: *mut c_void) -> *mut X509_REQ;
     pub fn PEM_read_bio_PrivateKey(bio: *mut BIO, out: *mut *mut EVP_PKEY, callback: Option<PasswordCallback>,
                              user_data: *mut c_void) -> *mut X509;
+    pub fn PEM_read_bio_PUBKEY(bio: *mut BIO, out: *mut *mut EVP_PKEY, callback: Option<PasswordCallback>,
+                             user_data: *mut c_void) -> *mut X509;
 
     pub fn PEM_write_bio_PrivateKey(bio: *mut BIO, pkey: *mut EVP_PKEY, cipher: *const EVP_CIPHER,
                                     kstr: *mut c_char, klen: c_int,

openssl/src/crypto/pkey.rs

@@ -96,6 +96,22 @@ impl PKey {
         }
     }
 
+    /// Reads public key from PEM, takes ownership of handle
+    pub fn public_key_from_pem<R>(reader: &mut R) -> Result<PKey, SslError> where R: Read {
+        let mut mem_bio = try!(MemBio::new());
+        try!(io::copy(reader, &mut mem_bio).map_err(StreamError));
+
+        unsafe {
+            let evp = try_ssl_null!(ffi::PEM_read_bio_PUBKEY(mem_bio.get_handle(),
+                                                                 ptr::null_mut(),
+                                                                 None, ptr::null_mut()));
+            Ok(PKey {
+                evp:   evp,
+                parts: Parts::Public,
+            })
+        }
+    }
+
     fn _tostr(&self, f: unsafe extern "C" fn(*mut ffi::RSA, *const *mut u8) -> c_int) -> Vec<u8> {
         unsafe {
             let rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
@@ -466,6 +482,16 @@ mod tests {
         super::PKey::private_key_from_pem(&mut file).unwrap();
     }
 
+    #[test]
+    fn test_public_key_from_pem() {
+        let key_path = Path::new("test/key.pem.pub");
+        let mut file = File::open(&key_path)
+            .ok()
+            .expect("Failed to open `test/key.pem.pub`");
+
+        super::PKey::public_key_from_pem(&mut file).unwrap();
+    }
+
     #[test]
     fn test_encrypt() {
         let mut k0 = super::PKey::new();

openssl/test/key.pem.pub

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr1bXMptaIgOL9PVL8a7W
+KG/C8+IbxP018eMBQZT0SnPQmXp0Q8Aai/F+AEDE7b5sO5U7WdxU4GRYw0wqkQNF
+si78KNfoj2ZMlx6NRfl4UKuzrpGTPgQxuKDYedngPpWcbmW4P3zEL2Y7b18n9NJr
+atRUzH1Zh/ReRO525Xadu58aviPw1Mzgse7cKyzb03Gll9noLnYNIIpO8jL+QyrD
+8qNmfacmR20U0a6XDTtmsmk7AitGETICbTT0KRf+oAP0yIHoonllPpNLUEPZQjrp
+ClS/S/wKdj7gaq9TaMbHULhFMjbCV8cuPu//rUAuWp3riaznZGOVQyn3Dp2CB3ad
+yQIDAQAB
+-----END PUBLIC KEY-----