Diff: wolfcrypt/src/chacha20_poly1305.c

Revision:

3:6f956bdb3073

Parent:

2:28278596c2a2

Child:

4:1b0d80432c79

diff -r 28278596c2a2 -r 6f956bdb3073 wolfcrypt/src/chacha20_poly1305.c
--- a/wolfcrypt/src/chacha20_poly1305.c	Tue Jul 21 11:37:09 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,275 +0,0 @@
-/* chacha.c
- *
- * Copyright (C) 2006-2015 wolfSSL Inc.
- *
- * This file is part of wolfSSL. (formerly known as CyaSSL)
- *
- * 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 02110-1301, USA
- */
-
-
-#ifdef HAVE_CONFIG_H
-    #include <config.h>
-#endif
-
-#include <wolfssl/wolfcrypt/settings.h>
-
-#if defined(HAVE_CHACHA) && defined(HAVE_POLY1305)
-
-#include <wolfssl/wolfcrypt/chacha20_poly1305.h>
-#include <wolfssl/wolfcrypt/error-crypt.h>
-#include <wolfssl/wolfcrypt/logging.h>
-#include <wolfssl/wolfcrypt/chacha.h>
-#include <wolfssl/wolfcrypt/poly1305.h>
-
-#ifdef NO_INLINE
-#include <wolfssl/wolfcrypt/misc.h>
-#else
-#include <wolfcrypt/src/misc.c>
-#endif
-
-#ifdef CHACHA_AEAD_TEST
-#include <stdio.h>
-#endif
-
-#define CHACHA20_POLY1305_AEAD_INITIAL_COUNTER  0
-#define CHACHA20_POLY1305_MAC_PADDING_ALIGNMENT 16
-
-static void word32ToLittle64(const word32 inLittle32, byte outLittle64[8]);
-static int calculateAuthTag(
-                  const byte inAuthKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
-                  const byte* inAAD, const word32 inAADLen,
-                  const byte *inCiphertext, const word32 inCiphertextLen,
-                  byte outAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE]);
-
-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])
-{
-    int err;
-    byte poly1305Key[CHACHA20_POLY1305_AEAD_KEYSIZE];
-    ChaCha chaChaCtx;
-
-    /* Validate function arguments */
-
-    if (!inKey || !inIV ||
-        !inPlaintext || !inPlaintextLen ||
-        !outCiphertext ||
-        !outAuthTag)
-    {
-        return BAD_FUNC_ARG;
-    }
-
-    XMEMSET(poly1305Key, 0, sizeof(poly1305Key));
-
-    /* Create the Poly1305 key */
-    err = wc_Chacha_SetKey(&chaChaCtx, inKey, CHACHA20_POLY1305_AEAD_KEYSIZE);
-    if (err != 0) return err;
-
-    err = wc_Chacha_SetIV(&chaChaCtx, inIV,
-                           CHACHA20_POLY1305_AEAD_INITIAL_COUNTER);
-    if (err != 0) return err;
-
-    err = wc_Chacha_Process(&chaChaCtx, poly1305Key, poly1305Key,
-                             CHACHA20_POLY1305_AEAD_KEYSIZE);
-    if (err != 0) return err;
-
-    /* Encrypt the plaintext using ChaCha20 */
-    err = wc_Chacha_Process(&chaChaCtx, outCiphertext, inPlaintext,
-                            inPlaintextLen);
-    /* Calculate the Poly1305 auth tag */
-    if (err == 0)
-        err = calculateAuthTag(poly1305Key,
-                               inAAD, inAADLen,
-                               outCiphertext, inPlaintextLen,
-                               outAuthTag);
-    ForceZero(poly1305Key, sizeof(poly1305Key));
-
-    return err;
-}
-
-
-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)
-{
-    int err;
-    byte poly1305Key[CHACHA20_POLY1305_AEAD_KEYSIZE];
-    ChaCha chaChaCtx;
-    byte calculatedAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE];
-
-    /* Validate function arguments */
-
-    if (!inKey || !inIV ||
-        !inCiphertext || !inCiphertextLen ||
-        !inAuthTag ||
-        !outPlaintext)
-    {
-        return BAD_FUNC_ARG;
-    }
-
-    XMEMSET(calculatedAuthTag, 0, sizeof(calculatedAuthTag));
-    XMEMSET(poly1305Key, 0, sizeof(poly1305Key));
-
-    /* Create the Poly1305 key */
-    err = wc_Chacha_SetKey(&chaChaCtx, inKey, CHACHA20_POLY1305_AEAD_KEYSIZE);
-    if (err != 0) return err;
-
-    err = wc_Chacha_SetIV(&chaChaCtx, inIV,
-                           CHACHA20_POLY1305_AEAD_INITIAL_COUNTER);
-    if (err != 0) return err;
-
-    err = wc_Chacha_Process(&chaChaCtx, poly1305Key, poly1305Key,
-                             CHACHA20_POLY1305_AEAD_KEYSIZE);
-    if (err != 0) return err;
-
-    /* Calculate the Poly1305 auth tag */
-    err = calculateAuthTag(poly1305Key,
-                           inAAD, inAADLen,
-                           inCiphertext, inCiphertextLen,
-                           calculatedAuthTag);
-
-    /* Compare the calculated auth tag with the received one */
-    if (err == 0 && ConstantCompare(inAuthTag, calculatedAuthTag,
-                                    CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE) != 0)
-    {
-        err = MAC_CMP_FAILED_E;
-    }
-
-    /* Decrypt the received ciphertext */
-    if (err == 0)
-        err = wc_Chacha_Process(&chaChaCtx, outPlaintext, inCiphertext,
-                                inCiphertextLen);
-    ForceZero(poly1305Key, sizeof(poly1305Key));
-
-    return err;
-}
-
-
-static int calculateAuthTag(
-                const byte inAuthKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
-                const byte *inAAD, const word32 inAADLen,
-                const byte *inCiphertext, const word32 inCiphertextLen,
-                 byte outAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE])
-{
-    int err;
-    Poly1305 poly1305Ctx;
-    byte padding[CHACHA20_POLY1305_MAC_PADDING_ALIGNMENT - 1];
-    word32 paddingLen;
-    byte little64[8];
-
-    XMEMSET(padding, 0, sizeof(padding));
-
-    /* Initialize Poly1305 */
-
-    err = wc_Poly1305SetKey(&poly1305Ctx, inAuthKey,
-                            CHACHA20_POLY1305_AEAD_KEYSIZE);
-    if (err)
-    {
-        return err;
-    }
-
-    /* Create the authTag by MAC'ing the following items: */
-
-    /* -- AAD */
-
-    if (inAAD && inAADLen)
-    {
-        err = wc_Poly1305Update(&poly1305Ctx, inAAD, inAADLen);
-
-        /* -- padding1: pad the AAD to 16 bytes */
-
-        paddingLen = -inAADLen & (CHACHA20_POLY1305_MAC_PADDING_ALIGNMENT - 1);
-        if (paddingLen)
-        {
-            err += wc_Poly1305Update(&poly1305Ctx, padding, paddingLen);
-        }
-
-        if (err)
-        {
-            return err;
-        }
-    }
-
-    /* -- Ciphertext */
-
-    err = wc_Poly1305Update(&poly1305Ctx, inCiphertext, inCiphertextLen);
-    if (err)
-    {
-        return err;
-    }
-
-    /* -- padding2: pad the ciphertext to 16 bytes */
-
-    paddingLen = -inCiphertextLen &
-                                  (CHACHA20_POLY1305_MAC_PADDING_ALIGNMENT - 1);
-    if (paddingLen)
-    {
-        err = wc_Poly1305Update(&poly1305Ctx, padding, paddingLen);
-        if (err)
-        {
-            return err;
-        }
-    }
-
-    /* -- AAD length as a 64-bit little endian integer */
-
-    word32ToLittle64(inAADLen, little64);
-
-    err = wc_Poly1305Update(&poly1305Ctx, little64, sizeof(little64));
-    if (err)
-    {
-        return err;
-    }
-
-    /* -- Ciphertext length as a 64-bit little endian integer */
-
-    word32ToLittle64(inCiphertextLen, little64);
-
-    err = wc_Poly1305Update(&poly1305Ctx, little64, sizeof(little64));
-    if (err)
-    {
-        return err;
-    }
-
-    /* Finalize the auth tag */
-
-    err = wc_Poly1305Final(&poly1305Ctx, outAuthTag);
-
-    return err;
-}
-
-
-static void word32ToLittle64(const word32 inLittle32, byte outLittle64[8])
-{
-    XMEMSET(outLittle64, 0, 8);
-
-    outLittle64[0] = (inLittle32 & 0x000000FF);
-    outLittle64[1] = (inLittle32 & 0x0000FF00) >> 8;
-    outLittle64[2] = (inLittle32 & 0x00FF0000) >> 16;
-    outLittle64[3] = (inLittle32 & 0xFF000000) >> 24;
-}
-
-
-#endif /* HAVE_CHACHA && HAVE_POLY1305 */
-