Merge pull request #2017 from johntyner/feature/cipher-ctx-clone

Add openssl::cipher_ctx::CipherCtx::clone

Author: sfackler

openssl-sys/src/handwritten/evp.rs

@@ -271,6 +271,8 @@ const_ptr_api! {
 extern "C" {
     pub fn EVP_CIPHER_CTX_new() -> *mut EVP_CIPHER_CTX;
     pub fn EVP_CIPHER_CTX_free(ctx: *mut EVP_CIPHER_CTX);
+    pub fn EVP_CIPHER_CTX_copy(dst: *mut EVP_CIPHER_CTX, src: *const EVP_CIPHER_CTX) -> c_int;
+
     pub fn EVP_MD_CTX_copy_ex(dst: *mut EVP_MD_CTX, src: *const EVP_MD_CTX) -> c_int;
     #[cfg(ossl111)]
     pub fn EVP_MD_CTX_reset(ctx: *mut EVP_MD_CTX) -> c_int;

openssl/src/cipher_ctx.rs

@@ -105,6 +105,14 @@ impl CipherCtx {
 }
 
 impl CipherCtxRef {
+    #[corresponds(EVP_CIPHER_CTX_copy)]
+    pub fn copy(&mut self, src: &CipherCtxRef) -> Result<(), ErrorStack> {
+        unsafe {
+            cvt(ffi::EVP_CIPHER_CTX_copy(self.as_ptr(), src.as_ptr()))?;
+            Ok(())
+        }
+    }
+
     /// Initializes the context for encryption.
     ///
     /// Normally this is called once to set all of the cipher, key, and IV. However, this process can be split up