1 files changed, 30 insertions, 0 deletions
diff --git a/lib/crypto/c_src/cipher.h b/lib/crypto/c_src/cipher.h
new file mode 100644
index 0000000000..25cb53e2e0
--- /dev/null
+++ b/lib/crypto/c_src/cipher.h
@@ -0,0 +1,30 @@
+#ifndef E_CIPHER_H__
+#define E_CIPHER_H__ 1
+
+#include "common.h"
+
+struct cipher_type_t {
+    union {
+	const char* str;    /* before init */
+	ERL_NIF_TERM atom;  /* after init */
+    }type;
+    union {
+	const EVP_CIPHER* (*funcp)(void); /* before init, NULL if notsup */
+	const EVP_CIPHER* p;              /* after init, NULL if notsup */
+    }cipher;
+    const size_t key_len;      /* != 0 to also match on key_len */
+};
+
+#ifdef HAVE_EVP_AES_CTR
+extern ErlNifResourceType* evp_cipher_ctx_rtype;
+struct evp_cipher_ctx {
+    EVP_CIPHER_CTX* ctx;
+};
+
+void evp_cipher_ctx_dtor(ErlNifEnv* env, struct evp_cipher_ctx* ctx);
+#endif
+
+void init_cipher_types(ErlNifEnv* env);
+struct cipher_type_t* get_cipher_type(ERL_NIF_TERM type, size_t key_len);
+
+#endif /* E_CIPHER_H__ */