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diff --git a/include/git2/sys/credential.h b/include/git2/sys/credential.h
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+++ b/include/git2/sys/credential.h
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+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_sys_git_credential_h__
+#define INCLUDE_sys_git_credential_h__
+
+#include "git2/common.h"
+#include "git2/credential.h"
+
+/**
+ * @file git2/sys/cred.h
+ * @brief Git credentials low-level implementation
+ * @defgroup git_credential Git credentials low-level implementation
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/**
+ * The base structure for all credential types
+ */
+struct git_credential {
+	git_credential_t credtype; /**< A type of credential */
+
+	/** The deallocator for this type of credentials */
+	void GIT_CALLBACK(free)(git_credential *cred);
+};
+
+/** A plaintext username and password */
+struct git_credential_userpass_plaintext {
+	git_credential parent; /**< The parent credential */
+	char *username;        /**< The username to authenticate as */
+	char *password;        /**< The password to use */
+};
+
+/** Username-only credential information */
+struct git_credential_username {
+	git_credential parent; /**< The parent credential */
+	char username[1];      /**< The username to authenticate as */
+};
+
+/**
+ * A ssh key from disk
+ */
+struct git_credential_ssh_key {
+	git_credential parent; /**< The parent credential */
+	char *username;        /**< The username to authenticate as */
+	char *publickey;       /**< The path to a public key */
+	char *privatekey;      /**< The path to a private key */
+	char *passphrase;      /**< Passphrase to decrypt the private key */
+};
+
+/**
+ * Keyboard-interactive based ssh authentication
+ */
+struct git_credential_ssh_interactive {
+	git_credential parent; /**< The parent credential */
+	char *username;        /**< The username to authenticate as */
+
+	/**
+	 * Callback used for authentication.
+	 */
+	git_credential_ssh_interactive_cb prompt_callback;
+
+	void *payload;         /**< Payload passed to prompt_callback */
+};
+
+/**
+ * A key with a custom signature function
+ */
+struct git_credential_ssh_custom {
+	git_credential parent; /**< The parent credential */
+	char *username;        /**< The username to authenticate as */
+	char *publickey;       /**< The public key data */
+	size_t publickey_len;  /**< Length of the public key */
+
+	/**
+	 * Callback used to sign the data.
+	 */
+	git_credential_sign_cb sign_callback;
+
+	void *payload;         /**< Payload passed to prompt_callback */
+};
+
+GIT_END_DECL
+
+#endif