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1 files changed, 83 insertions, 0 deletions

diff --git a/wolfssl/wolfcrypt/chacha.h b/wolfssl/wolfcrypt/chacha.h
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+/* chacha.h
+ *
+ * Copyright (C) 2006-2020 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
+ */
+
+/*!
+    \file wolfssl/wolfcrypt/chacha.h
+*/
+
+
+#ifndef WOLF_CRYPT_CHACHA_H
+#define WOLF_CRYPT_CHACHA_H
+
+#include <wolfssl/wolfcrypt/types.h>
+
+#ifdef HAVE_CHACHA
+
+#ifdef __cplusplus
+    extern "C" {
+#endif
+
+/* Size of the IV */
+#define CHACHA_IV_WORDS    3
+#define CHACHA_IV_BYTES    (CHACHA_IV_WORDS * sizeof(word32))
+
+/* Size of ChaCha chunks */
+#define CHACHA_CHUNK_WORDS 16
+#define CHACHA_CHUNK_BYTES (CHACHA_CHUNK_WORDS * sizeof(word32))
+
+#ifdef WOLFSSL_X86_64_BUILD
+#if defined(USE_INTEL_SPEEDUP) && !defined(NO_CHACHA_ASM)
+    #define USE_INTEL_CHACHA_SPEEDUP
+    #define HAVE_INTEL_AVX1
+#endif
+#endif
+
+enum {
+	CHACHA_ENC_TYPE = WC_CIPHER_CHACHA,    /* cipher unique type */
+    CHACHA_MAX_KEY_SZ = 32,
+};
+
+typedef struct ChaCha {
+    word32 X[CHACHA_CHUNK_WORDS];           /* state of cipher */
+    word32 left;                            /* number of bytes leftover */
+#ifdef HAVE_INTEL_AVX1
+    /* vpshufd reads 16 bytes but we only use bottom 4. */
+    byte extra[12];
+#endif
+} ChaCha;
+
+/**
+  * IV(nonce) changes with each record
+  * counter is for what value the block counter should start ... usually 0
+  */
+WOLFSSL_API int wc_Chacha_SetIV(ChaCha* ctx, const byte* inIv, word32 counter);
+
+WOLFSSL_API int wc_Chacha_Process(ChaCha* ctx, byte* cipher, const byte* plain,
+                              word32 msglen);
+WOLFSSL_API int wc_Chacha_SetKey(ChaCha* ctx, const byte* key, word32 keySz);
+
+#ifdef __cplusplus
+    } /* extern "C" */
+#endif
+
+#endif /* HAVE_CHACHA */
+#endif /* WOLF_CRYPT_CHACHA_H */
+