Diff: wolfssl/wolfcrypt/chacha20_poly1305.h

Revision:

4:1b0d80432c79

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wolfssl/wolfcrypt/chacha20_poly1305.h	Thu Apr 28 00:57:21 2016 +0000
@@ -0,0 +1,81 @@
+/* chacha20_poly1305.h
+ *
+ * Copyright (C) 2006-2016 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+ */
+
+
+/* This implementation of the ChaCha20-Poly1305 AEAD is based on "ChaCha20
+ * and Poly1305 for IETF protocols" (draft-irtf-cfrg-chacha20-poly1305-10):
+ * https://tools.ietf.org/html/draft-irtf-cfrg-chacha20-poly1305-10
+ */
+
+#ifndef WOLF_CRYPT_CHACHA20_POLY1305_H
+#define WOLF_CRYPT_CHACHA20_POLY1305_H
+
+#include <wolfssl/wolfcrypt/types.h>
+
+#if defined(HAVE_CHACHA) && defined(HAVE_POLY1305)
+
+#ifdef __cplusplus
+    extern "C" {
+#endif
+
+#define CHACHA20_POLY1305_AEAD_KEYSIZE      32
+#define CHACHA20_POLY1305_AEAD_IV_SIZE      12
+#define CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE 16
+
+enum {
+    CHACHA20_POLY_1305_ENC_TYPE = 8    /* cipher unique type */
+};
+
+    /*
+     * The IV for this implementation is 96 bits to give the most flexibility.
+     *
+     * Some protocols may have unique per-invocation inputs that are not
+     * 96-bit in length. For example, IPsec may specify a 64-bit nonce. In
+     * such a case, it is up to the protocol document to define how to
+     * transform the protocol nonce into a 96-bit nonce, for example by
+     * concatenating a constant value.
+     */
+
+WOLFSSL_API
+int wc_ChaCha20Poly1305_Encrypt(
+                const byte inKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
+                const byte inIV[CHACHA20_POLY1305_AEAD_IV_SIZE],
+                const byte* inAAD, const word32 inAADLen,
+                const byte* inPlaintext, const word32 inPlaintextLen,
+                byte* outCiphertext,
+                byte outAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE]);
+
+WOLFSSL_API
+int wc_ChaCha20Poly1305_Decrypt(
+                const byte inKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
+                const byte inIV[CHACHA20_POLY1305_AEAD_IV_SIZE],
+                const byte* inAAD, const word32 inAADLen,
+                const byte* inCiphertext, const word32 inCiphertextLen,
+                const byte inAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE],
+                byte* outPlaintext);
+
+#ifdef __cplusplus
+    } /* extern "C" */
+#endif
+
+#endif /* HAVE_CHACHA && HAVE_POLY1305 */
+#endif /* WOLF_CRYPT_CHACHA20_POLY1305_H */
+