Diff: wolfcrypt/src/cmac.c

Revision:

17:ff9d1e86ad5f

Parent:

16:048e5e270a58

diff -r 048e5e270a58 -r ff9d1e86ad5f wolfcrypt/src/cmac.c
--- a/wolfcrypt/src/cmac.c	Tue Nov 19 14:32:16 2019 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,216 +0,0 @@
-/* cmac.c
- *
- * Copyright (C) 2006-2017 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
- */
-
-
-#ifdef HAVE_CONFIG_H
-    #include <config.h>
-#endif
-
-#include <wolfssl/wolfcrypt/settings.h>
-
-#if defined(WOLFSSL_CMAC) && !defined(NO_AES) && defined(WOLFSSL_AES_DIRECT)
-
-#if defined(HAVE_FIPS) && \
-	defined(HAVE_FIPS_VERSION) && (HAVE_FIPS_VERSION >= 2)
-
-    /* set NO_WRAPPERS before headers, use direct internal f()s not wrappers */
-    #define FIPS_NO_WRAPPERS
-
-    #ifdef USE_WINDOWS_API
-        #pragma code_seg(".fipsA$n")
-        #pragma const_seg(".fipsB$n")
-    #endif
-#endif
-
-#ifdef NO_INLINE
-    #include <wolfssl/wolfcrypt/misc.h>
-#else
-    #define WOLFSSL_MISC_INCLUDED
-    #include <wolfcrypt/src/misc.c>
-#endif
-
-#include <wolfssl/wolfcrypt/error-crypt.h>
-#include <wolfssl/wolfcrypt/aes.h>
-#include <wolfssl/wolfcrypt/cmac.h>
-
-
-static void ShiftAndXorRb(byte* out, byte* in)
-{
-    int i, j, xorRb;
-    int mask = 0, last = 0;
-    byte Rb = 0x87;
-
-    xorRb = (in[0] & 0x80) != 0;
-
-    for (i = 1, j = AES_BLOCK_SIZE - 1; i <= AES_BLOCK_SIZE; i++, j--) {
-        last = (in[j] & 0x80) ? 1 : 0;
-        out[j] = (byte)((in[j] << 1) | mask);
-        mask = last;
-        if (xorRb) {
-            out[j] ^= Rb;
-            Rb = 0;
-        }
-    }
-}
-
-
-int wc_InitCmac(Cmac* cmac, const byte* key, word32 keySz,
-                int type, void* unused)
-{
-    int ret;
-
-    (void)unused;
-
-    if (cmac == NULL || key == NULL || keySz == 0 || type != WC_CMAC_AES)
-        return BAD_FUNC_ARG;
-
-    XMEMSET(cmac, 0, sizeof(Cmac));
-    ret = wc_AesSetKey(&cmac->aes, key, keySz, NULL, AES_ENCRYPTION);
-    if (ret == 0) {
-        byte l[AES_BLOCK_SIZE];
-
-        XMEMSET(l, 0, AES_BLOCK_SIZE);
-        wc_AesEncryptDirect(&cmac->aes, l, l);
-        ShiftAndXorRb(cmac->k1, l);
-        ShiftAndXorRb(cmac->k2, cmac->k1);
-        ForceZero(l, AES_BLOCK_SIZE);
-    }
-    return ret;
-}
-
-
-int wc_CmacUpdate(Cmac* cmac, const byte* in, word32 inSz)
-{
-    if ((cmac == NULL) || (in == NULL && inSz != 0))
-        return BAD_FUNC_ARG;
-
-    while (inSz != 0) {
-        word32 add = min(inSz, AES_BLOCK_SIZE - cmac->bufferSz);
-        XMEMCPY(&cmac->buffer[cmac->bufferSz], in, add);
-
-        cmac->bufferSz += add;
-        in += add;
-        inSz -= add;
-
-        if (cmac->bufferSz == AES_BLOCK_SIZE && inSz != 0) {
-            if (cmac->totalSz != 0)
-                xorbuf(cmac->buffer, cmac->digest, AES_BLOCK_SIZE);
-            wc_AesEncryptDirect(&cmac->aes,
-                                cmac->digest,
-                                cmac->buffer);
-            cmac->totalSz += AES_BLOCK_SIZE;
-            cmac->bufferSz = 0;
-        }
-    }
-
-    return 0;
-}
-
-
-int wc_CmacFinal(Cmac* cmac, byte* out, word32* outSz)
-{
-    const byte* subKey;
-
-    if (cmac == NULL || out == NULL || outSz == NULL)
-        return BAD_FUNC_ARG;
-
-    if (*outSz < WC_CMAC_TAG_MIN_SZ || *outSz > WC_CMAC_TAG_MAX_SZ)
-        return BUFFER_E;
-
-    if (cmac->bufferSz == AES_BLOCK_SIZE) {
-        subKey = cmac->k1;
-    }
-    else {
-        word32 remainder = AES_BLOCK_SIZE - cmac->bufferSz;
-
-        if (remainder == 0)
-            remainder = AES_BLOCK_SIZE;
-
-        if (remainder > 1)
-            XMEMSET(cmac->buffer + AES_BLOCK_SIZE - remainder, 0, remainder);
-        cmac->buffer[AES_BLOCK_SIZE - remainder] = 0x80;
-        subKey = cmac->k2;
-    }
-    xorbuf(cmac->buffer, cmac->digest, AES_BLOCK_SIZE);
-    xorbuf(cmac->buffer, subKey, AES_BLOCK_SIZE);
-    wc_AesEncryptDirect(&cmac->aes, cmac->digest, cmac->buffer);
-
-    XMEMCPY(out, cmac->digest, *outSz);
-
-    ForceZero(cmac, sizeof(Cmac));
-
-    return 0;
-}
-
-
-int wc_AesCmacGenerate(byte* out, word32* outSz,
-                       const byte* in, word32 inSz,
-                       const byte* key, word32 keySz)
-{
-    Cmac cmac;
-    int ret;
-
-    if (out == NULL || (in == NULL && inSz > 0) || key == NULL || keySz == 0)
-        return BAD_FUNC_ARG;
-
-    ret = wc_InitCmac(&cmac, key, keySz, WC_CMAC_AES, NULL);
-    if (ret != 0)
-        return ret;
-
-    ret = wc_CmacUpdate(&cmac, in, inSz);
-    if (ret != 0)
-        return ret;
-
-    ret = wc_CmacFinal(&cmac, out, outSz);
-    if (ret != 0)
-        return ret;
-
-    return 0;
-}
-
-
-int wc_AesCmacVerify(const byte* check, word32 checkSz,
-                     const byte* in, word32 inSz,
-                     const byte* key, word32 keySz)
-{
-    byte a[AES_BLOCK_SIZE];
-    word32 aSz = sizeof(a);
-    int result;
-    int compareRet;
-
-    if (check == NULL || checkSz == 0 || (in == NULL && inSz != 0) ||
-        key == NULL || keySz == 0)
-
-        return BAD_FUNC_ARG;
-
-    XMEMSET(a, 0, aSz);
-    result = wc_AesCmacGenerate(a, &aSz, in, inSz, key, keySz);
-    compareRet = ConstantCompare(check, a, min(checkSz, aSz));
-
-    if (result == 0)
-        result = compareRet ? 1 : 0;
-
-    return result;
-}
-
-
-#endif /* WOLFSSL_CMAC && NO_AES && WOLFSSL_AES_DIRECT */
-