Diff: wolfcrypt/src/hmac.c

Revision:

6:fa3bd0ca5896

Parent:

4:1b0d80432c79

Child:

7:481bce714567

--- a/wolfcrypt/src/hmac.c	Thu Apr 28 00:57:21 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,880 +0,0 @@
-/* hmac.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
- */
-
-
-#ifdef HAVE_CONFIG_H
-    #include <config.h>
-#endif
-
-#include <wolfssl/wolfcrypt/settings.h>
-
-#ifndef NO_HMAC
-
-#include <wolfssl/wolfcrypt/hmac.h>
-
-#ifdef HAVE_FIPS
-/* does init */
-int wc_HmacSetKey(Hmac* hmac, int type, const byte* key, word32 keySz)
-{
-    return HmacSetKey_fips(hmac, type, key, keySz);
-}
-
-
-int wc_HmacUpdate(Hmac* hmac, const byte* in, word32 sz)
-{
-    return HmacUpdate_fips(hmac, in, sz);
-}
-
-
-int wc_HmacFinal(Hmac* hmac, byte* out)
-{
-    return HmacFinal_fips(hmac, out);
-}
-
-
-#ifdef HAVE_CAVIUM
-    int  wc_HmacInitCavium(Hmac* hmac, int i)
-    {
-        return HmacInitCavium(hmac, i);
-    }
-
-
-    void wc_HmacFreeCavium(Hmac* hmac)
-    {
-        HmacFreeCavium(hmac);
-    }
-#endif
-
-int wolfSSL_GetHmacMaxSize(void)
-{
-    return CyaSSL_GetHmacMaxSize();
-}
-
-#ifdef HAVE_HKDF
-
-int wc_HKDF(int type, const byte* inKey, word32 inKeySz,
-                    const byte* salt, word32 saltSz,
-                    const byte* info, word32 infoSz,
-                    byte* out, word32 outSz)
-{
-    return HKDF(type, inKey, inKeySz, salt, saltSz, info, infoSz, out, outSz);
-}
-
-
-#endif /* HAVE_HKDF */
-#else /* else build without fips */
-#ifdef WOLFSSL_PIC32MZ_HASH
-
-#define wc_InitMd5   wc_InitMd5_sw
-#define wc_Md5Update wc_Md5Update_sw
-#define wc_Md5Final  wc_Md5Final_sw
-
-#define wc_InitSha   wc_InitSha_sw
-#define wc_ShaUpdate wc_ShaUpdate_sw
-#define wc_ShaFinal  wc_ShaFinal_sw
-
-#define wc_InitSha256   wc_InitSha256_sw
-#define wc_Sha256Update wc_Sha256Update_sw
-#define wc_Sha256Final  wc_Sha256Final_sw
-
-#endif
-
-#ifdef HAVE_FIPS
-    /* set NO_WRAPPERS before headers, use direct internal f()s not wrappers */
-    #define FIPS_NO_WRAPPERS
-#endif
-
-#include <wolfssl/wolfcrypt/error-crypt.h>
-
-
-#ifdef HAVE_CAVIUM
-    static int HmacCaviumFinal(Hmac* hmac, byte* hash);
-    static int HmacCaviumUpdate(Hmac* hmac, const byte* msg, word32 length);
-    static int HmacCaviumSetKey(Hmac* hmac, int type, const byte* key,
-                                word32 length);
-#endif
-
-static int InitHmac(Hmac* hmac, int type)
-{
-    int ret = 0;
-
-    hmac->innerHashKeyed = 0;
-    hmac->macType = (byte)type;
-
-    if (!(type == MD5 || type == SHA    || type == SHA256 || type == SHA384
-                      || type == SHA512 || type == BLAKE2B_ID))
-        return BAD_FUNC_ARG;
-
-    switch (type) {
-        #ifndef NO_MD5
-        case MD5:
-            wc_InitMd5(&hmac->hash.md5);
-        break;
-        #endif
-
-        #ifndef NO_SHA
-        case SHA:
-            ret = wc_InitSha(&hmac->hash.sha);
-        break;
-        #endif
-
-        #ifndef NO_SHA256
-        case SHA256:
-            ret = wc_InitSha256(&hmac->hash.sha256);
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA384
-        case SHA384:
-            ret = wc_InitSha384(&hmac->hash.sha384);
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA512
-        case SHA512:
-            ret = wc_InitSha512(&hmac->hash.sha512);
-        break;
-        #endif
-
-        #ifdef HAVE_BLAKE2
-        case BLAKE2B_ID:
-            ret = wc_InitBlake2b(&hmac->hash.blake2b, BLAKE2B_256);
-        break;
-        #endif
-
-        default:
-            return BAD_FUNC_ARG;
-    }
-
-    return ret;
-}
-
-
-int wc_HmacSetKey(Hmac* hmac, int type, const byte* key, word32 length)
-{
-    byte*  ip = (byte*) hmac->ipad;
-    byte*  op = (byte*) hmac->opad;
-    word32 i, hmac_block_size = 0;
-    int    ret;
-
-#ifdef HAVE_CAVIUM
-    if (hmac->magic == WOLFSSL_HMAC_CAVIUM_MAGIC)
-        return HmacCaviumSetKey(hmac, type, key, length);
-#endif
-
-    ret = InitHmac(hmac, type);
-    if (ret != 0)
-        return ret;
-
-#ifdef HAVE_FIPS
-    if (length < HMAC_FIPS_MIN_KEY)
-        return HMAC_MIN_KEYLEN_E;
-#endif
-
-    switch (hmac->macType) {
-        #ifndef NO_MD5
-        case MD5:
-        {
-            hmac_block_size = MD5_BLOCK_SIZE;
-            if (length <= MD5_BLOCK_SIZE) {
-                XMEMCPY(ip, key, length);
-            }
-            else {
-                wc_Md5Update(&hmac->hash.md5, key, length);
-                wc_Md5Final(&hmac->hash.md5, ip);
-                length = MD5_DIGEST_SIZE;
-            }
-        }
-        break;
-        #endif
-
-        #ifndef NO_SHA
-        case SHA:
-        {
-            hmac_block_size = SHA_BLOCK_SIZE;
-            if (length <= SHA_BLOCK_SIZE) {
-                XMEMCPY(ip, key, length);
-            }
-            else {
-                wc_ShaUpdate(&hmac->hash.sha, key, length);
-                wc_ShaFinal(&hmac->hash.sha, ip);
-                length = SHA_DIGEST_SIZE;
-            }
-        }
-        break;
-        #endif
-
-        #ifndef NO_SHA256
-        case SHA256:
-        {
-    		hmac_block_size = SHA256_BLOCK_SIZE;
-            if (length <= SHA256_BLOCK_SIZE) {
-                XMEMCPY(ip, key, length);
-            }
-            else {
-                ret = wc_Sha256Update(&hmac->hash.sha256, key, length);
-                if (ret != 0)
-                    return ret;
-
-                ret = wc_Sha256Final(&hmac->hash.sha256, ip);
-                if (ret != 0)
-                    return ret;
-
-                length = SHA256_DIGEST_SIZE;
-            }
-        }
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA384
-        case SHA384:
-        {
-            hmac_block_size = SHA384_BLOCK_SIZE;
-            if (length <= SHA384_BLOCK_SIZE) {
-                XMEMCPY(ip, key, length);
-            }
-            else {
-                ret = wc_Sha384Update(&hmac->hash.sha384, key, length);
-                if (ret != 0)
-                    return ret;
-
-                ret = wc_Sha384Final(&hmac->hash.sha384, ip);
-                if (ret != 0)
-                    return ret;
-
-                length = SHA384_DIGEST_SIZE;
-            }
-        }
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA512
-        case SHA512:
-        {
-            hmac_block_size = SHA512_BLOCK_SIZE;
-            if (length <= SHA512_BLOCK_SIZE) {
-                XMEMCPY(ip, key, length);
-            }
-            else {
-                ret = wc_Sha512Update(&hmac->hash.sha512, key, length);
-                if (ret != 0)
-                    return ret;
-
-                ret = wc_Sha512Final(&hmac->hash.sha512, ip);
-                if (ret != 0)
-                    return ret;
-
-                length = SHA512_DIGEST_SIZE;
-            }
-        }
-        break;
-        #endif
-
-        #ifdef HAVE_BLAKE2
-        case BLAKE2B_ID:
-        {
-            hmac_block_size = BLAKE2B_BLOCKBYTES;
-            if (length <= BLAKE2B_BLOCKBYTES) {
-                XMEMCPY(ip, key, length);
-            }
-            else {
-                ret = wc_Blake2bUpdate(&hmac->hash.blake2b, key, length);
-                if (ret != 0)
-                    return ret;
-
-                ret = wc_Blake2bFinal(&hmac->hash.blake2b, ip, BLAKE2B_256);
-                if (ret != 0)
-                    return ret;
-
-                length = BLAKE2B_256;
-            }
-        }
-        break;
-        #endif
-
-        default:
-            return BAD_FUNC_ARG;
-    }
-    if (length < hmac_block_size)
-        XMEMSET(ip + length, 0, hmac_block_size - length);
-
-    for(i = 0; i < hmac_block_size; i++) {
-        op[i] = ip[i] ^ OPAD;
-        ip[i] ^= IPAD;
-    }
-    return 0;
-}
-
-
-static int HmacKeyInnerHash(Hmac* hmac)
-{
-    int ret = 0;
-
-    switch (hmac->macType) {
-        #ifndef NO_MD5
-        case MD5:
-            wc_Md5Update(&hmac->hash.md5, (byte*) hmac->ipad, MD5_BLOCK_SIZE);
-        break;
-        #endif
-
-        #ifndef NO_SHA
-        case SHA:
-            wc_ShaUpdate(&hmac->hash.sha, (byte*) hmac->ipad, SHA_BLOCK_SIZE);
-        break;
-        #endif
-
-        #ifndef NO_SHA256
-        case SHA256:
-            ret = wc_Sha256Update(&hmac->hash.sha256,
-                                         (byte*) hmac->ipad, SHA256_BLOCK_SIZE);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA384
-        case SHA384:
-            ret = wc_Sha384Update(&hmac->hash.sha384,
-                                         (byte*) hmac->ipad, SHA384_BLOCK_SIZE);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA512
-        case SHA512:
-            ret = wc_Sha512Update(&hmac->hash.sha512,
-                                         (byte*) hmac->ipad, SHA512_BLOCK_SIZE);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        #ifdef HAVE_BLAKE2
-        case BLAKE2B_ID:
-            ret = wc_Blake2bUpdate(&hmac->hash.blake2b,
-                                         (byte*) hmac->ipad,BLAKE2B_BLOCKBYTES);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        default:
-        break;
-    }
-
-    hmac->innerHashKeyed = 1;
-
-    return ret;
-}
-
-
-int wc_HmacUpdate(Hmac* hmac, const byte* msg, word32 length)
-{
-    int ret;
-
-#ifdef HAVE_CAVIUM
-    if (hmac->magic == WOLFSSL_HMAC_CAVIUM_MAGIC)
-        return HmacCaviumUpdate(hmac, msg, length);
-#endif
-
-    if (!hmac->innerHashKeyed) {
-        ret = HmacKeyInnerHash(hmac);
-        if (ret != 0)
-            return ret;
-    }
-
-    switch (hmac->macType) {
-        #ifndef NO_MD5
-        case MD5:
-            wc_Md5Update(&hmac->hash.md5, msg, length);
-        break;
-        #endif
-
-        #ifndef NO_SHA
-        case SHA:
-            wc_ShaUpdate(&hmac->hash.sha, msg, length);
-        break;
-        #endif
-
-        #ifndef NO_SHA256
-        case SHA256:
-            ret = wc_Sha256Update(&hmac->hash.sha256, msg, length);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA384
-        case SHA384:
-            ret = wc_Sha384Update(&hmac->hash.sha384, msg, length);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA512
-        case SHA512:
-            ret = wc_Sha512Update(&hmac->hash.sha512, msg, length);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        #ifdef HAVE_BLAKE2
-        case BLAKE2B_ID:
-            ret = wc_Blake2bUpdate(&hmac->hash.blake2b, msg, length);
-            if (ret != 0)
-                return ret;
-        break;
-        #endif
-
-        default:
-        break;
-    }
-
-    return 0;
-}
-
-
-int wc_HmacFinal(Hmac* hmac, byte* hash)
-{
-    int ret;
-
-#ifdef HAVE_CAVIUM
-    if (hmac->magic == WOLFSSL_HMAC_CAVIUM_MAGIC)
-        return HmacCaviumFinal(hmac, hash);
-#endif
-
-    if (!hmac->innerHashKeyed) {
-        ret = HmacKeyInnerHash(hmac);
-        if (ret != 0)
-            return ret;
-    }
-
-    switch (hmac->macType) {
-        #ifndef NO_MD5
-        case MD5:
-        {
-            wc_Md5Final(&hmac->hash.md5, (byte*) hmac->innerHash);
-
-            wc_Md5Update(&hmac->hash.md5, (byte*) hmac->opad, MD5_BLOCK_SIZE);
-            wc_Md5Update(&hmac->hash.md5,
-                                     (byte*) hmac->innerHash, MD5_DIGEST_SIZE);
-
-            wc_Md5Final(&hmac->hash.md5, hash);
-        }
-        break;
-        #endif
-
-        #ifndef NO_SHA
-        case SHA:
-        {
-            wc_ShaFinal(&hmac->hash.sha, (byte*) hmac->innerHash);
-
-            wc_ShaUpdate(&hmac->hash.sha, (byte*) hmac->opad, SHA_BLOCK_SIZE);
-            wc_ShaUpdate(&hmac->hash.sha,
-                                     (byte*) hmac->innerHash, SHA_DIGEST_SIZE);
-
-            wc_ShaFinal(&hmac->hash.sha, hash);
-        }
-        break;
-        #endif
-
-        #ifndef NO_SHA256
-        case SHA256:
-        {
-            ret = wc_Sha256Final(&hmac->hash.sha256, (byte*) hmac->innerHash);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha256Update(&hmac->hash.sha256,
-                                (byte*) hmac->opad, SHA256_BLOCK_SIZE);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha256Update(&hmac->hash.sha256,
-                                (byte*) hmac->innerHash, SHA256_DIGEST_SIZE);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha256Final(&hmac->hash.sha256, hash);
-            if (ret != 0)
-                return ret;
-        }
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA384
-        case SHA384:
-        {
-            ret = wc_Sha384Final(&hmac->hash.sha384, (byte*) hmac->innerHash);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha384Update(&hmac->hash.sha384,
-                                 (byte*) hmac->opad, SHA384_BLOCK_SIZE);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha384Update(&hmac->hash.sha384,
-                                 (byte*) hmac->innerHash, SHA384_DIGEST_SIZE);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha384Final(&hmac->hash.sha384, hash);
-            if (ret != 0)
-                return ret;
-        }
-        break;
-        #endif
-
-        #ifdef WOLFSSL_SHA512
-        case SHA512:
-        {
-            ret = wc_Sha512Final(&hmac->hash.sha512, (byte*) hmac->innerHash);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha512Update(&hmac->hash.sha512,
-                                 (byte*) hmac->opad, SHA512_BLOCK_SIZE);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha512Update(&hmac->hash.sha512,
-                                 (byte*) hmac->innerHash, SHA512_DIGEST_SIZE);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Sha512Final(&hmac->hash.sha512, hash);
-            if (ret != 0)
-                return ret;
-        }
-        break;
-        #endif
-
-        #ifdef HAVE_BLAKE2
-        case BLAKE2B_ID:
-        {
-            ret = wc_Blake2bFinal(&hmac->hash.blake2b, (byte*) hmac->innerHash,
-                         BLAKE2B_256);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Blake2bUpdate(&hmac->hash.blake2b,
-                                 (byte*) hmac->opad, BLAKE2B_BLOCKBYTES);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Blake2bUpdate(&hmac->hash.blake2b,
-                                 (byte*) hmac->innerHash, BLAKE2B_256);
-            if (ret != 0)
-                return ret;
-
-            ret = wc_Blake2bFinal(&hmac->hash.blake2b, hash, BLAKE2B_256);
-            if (ret != 0)
-                return ret;
-        }
-        break;
-        #endif
-
-        default:
-        break;
-    }
-
-    hmac->innerHashKeyed = 0;
-
-    return 0;
-}
-
-
-#ifdef HAVE_CAVIUM
-
-/* Initialize Hmac for use with Nitrox device */
-int wc_HmacInitCavium(Hmac* hmac, int devId)
-{
-    if (hmac == NULL)
-        return -1;
-
-    if (CspAllocContext(CONTEXT_SSL, &hmac->contextHandle, devId) != 0)
-        return -1;
-
-    hmac->keyLen  = 0;
-    hmac->dataLen = 0;
-    hmac->type    = 0;
-    hmac->devId   = devId;
-    hmac->magic   = WOLFSSL_HMAC_CAVIUM_MAGIC;
-    hmac->data    = NULL;        /* buffered input data */
-
-    hmac->innerHashKeyed = 0;
-
-    return 0;
-}
-
-
-/* Free Hmac from use with Nitrox device */
-void wc_HmacFreeCavium(Hmac* hmac)
-{
-    if (hmac == NULL)
-        return;
-
-    CspFreeContext(CONTEXT_SSL, hmac->contextHandle, hmac->devId);
-    hmac->magic = 0;
-    XFREE(hmac->data, NULL, DYNAMIC_TYPE_CAVIUM_TMP);
-    hmac->data = NULL;
-}
-
-
-static int HmacCaviumFinal(Hmac* hmac, byte* hash)
-{
-    word32 requestId;
-
-    if (CspHmac(CAVIUM_BLOCKING, hmac->type, NULL, hmac->keyLen,
-                (byte*)hmac->ipad, hmac->dataLen, hmac->data, hash, &requestId,
-                hmac->devId) != 0) {
-        WOLFSSL_MSG("Cavium Hmac failed");
-        return -1;
-    }
-    hmac->innerHashKeyed = 0;  /* tell update to start over if used again */
-
-    return 0;
-}
-
-
-static int HmacCaviumUpdate(Hmac* hmac, const byte* msg, word32 length)
-{
-    word16 add = (word16)length;
-    word32 total;
-    byte*  tmp;
-
-    if (length > WOLFSSL_MAX_16BIT) {
-        WOLFSSL_MSG("Too big msg for cavium hmac");
-        return -1;
-    }
-
-    if (hmac->innerHashKeyed == 0) {  /* starting new */
-        hmac->dataLen        = 0;
-        hmac->innerHashKeyed = 1;
-    }
-
-    total = add + hmac->dataLen;
-    if (total > WOLFSSL_MAX_16BIT) {
-        WOLFSSL_MSG("Too big msg for cavium hmac");
-        return -1;
-    }
-
-    tmp = XMALLOC(hmac->dataLen + add, NULL,DYNAMIC_TYPE_CAVIUM_TMP);
-    if (tmp == NULL) {
-        WOLFSSL_MSG("Out of memory for cavium update");
-        return -1;
-    }
-    if (hmac->dataLen)
-        XMEMCPY(tmp, hmac->data,  hmac->dataLen);
-    XMEMCPY(tmp + hmac->dataLen, msg, add);
-
-    hmac->dataLen += add;
-    XFREE(hmac->data, NULL, DYNAMIC_TYPE_CAVIUM_TMP);
-    hmac->data = tmp;
-
-    return 0;
-}
-
-
-static int HmacCaviumSetKey(Hmac* hmac, int type, const byte* key,
-                            word32 length)
-{
-    hmac->macType = (byte)type;
-    if (type == MD5)
-        hmac->type = MD5_TYPE;
-    else if (type == SHA)
-        hmac->type = SHA1_TYPE;
-    else if (type == SHA256)
-        hmac->type = SHA256_TYPE;
-    else  {
-        WOLFSSL_MSG("unsupported cavium hmac type");
-    }
-
-    hmac->innerHashKeyed = 0;  /* should we key Startup flag */
-
-    hmac->keyLen = (word16)length;
-    /* store key in ipad */
-    XMEMCPY(hmac->ipad, key, length);
-
-    return 0;
-}
-
-#endif /* HAVE_CAVIUM */
-
-int wolfSSL_GetHmacMaxSize(void)
-{
-    return MAX_DIGEST_SIZE;
-}
-
-#ifdef HAVE_HKDF
-
-#ifndef WOLFSSL_HAVE_MIN
-#define WOLFSSL_HAVE_MIN
-
-    static INLINE word32 min(word32 a, word32 b)
-    {
-        return a > b ? b : a;
-    }
-
-#endif /* WOLFSSL_HAVE_MIN */
-
-
-static INLINE int GetHashSizeByType(int type)
-{
-    if (!(type == MD5 || type == SHA    || type == SHA256 || type == SHA384
-                      || type == SHA512 || type == BLAKE2B_ID))
-        return BAD_FUNC_ARG;
-
-    switch (type) {
-        #ifndef NO_MD5
-        case MD5:
-            return MD5_DIGEST_SIZE;
-        #endif
-
-        #ifndef NO_SHA
-        case SHA:
-            return SHA_DIGEST_SIZE;
-        #endif
-
-        #ifndef NO_SHA256
-        case SHA256:
-            return SHA256_DIGEST_SIZE;
-        #endif
-
-        #ifdef WOLFSSL_SHA384
-        case SHA384:
-            return SHA384_DIGEST_SIZE;
-        #endif
-
-        #ifdef WOLFSSL_SHA512
-        case SHA512:
-            return SHA512_DIGEST_SIZE;
-        #endif
-
-        #ifdef HAVE_BLAKE2
-        case BLAKE2B_ID:
-            return BLAKE2B_OUTBYTES;
-        #endif
-
-        default:
-            return BAD_FUNC_ARG;
-    }
-}
-
-
-/* HMAC-KDF with hash type, optional salt and info, return 0 on success */
-int wc_HKDF(int type, const byte* inKey, word32 inKeySz,
-                   const byte* salt,  word32 saltSz,
-                   const byte* info,  word32 infoSz,
-                   byte* out,         word32 outSz)
-{
-    Hmac   myHmac;
-#ifdef WOLFSSL_SMALL_STACK
-    byte* tmp;
-    byte* prk;
-#else
-    byte   tmp[MAX_DIGEST_SIZE]; /* localSalt helper and T */
-    byte   prk[MAX_DIGEST_SIZE];
-#endif
-    const  byte* localSalt;  /* either points to user input or tmp */
-    int    hashSz = GetHashSizeByType(type);
-    word32 outIdx = 0;
-    byte   n = 0x1;
-    int    ret;
-
-    if (hashSz < 0)
-        return BAD_FUNC_ARG;
-
-#ifdef WOLFSSL_SMALL_STACK
-    tmp = (byte*)XMALLOC(MAX_DIGEST_SIZE, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-    if (tmp == NULL)
-        return MEMORY_E;
-
-    prk = (byte*)XMALLOC(MAX_DIGEST_SIZE, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-    if (prk == NULL) {
-        XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-        return MEMORY_E;
-    }
-#endif
-
-    localSalt = salt;
-    if (localSalt == NULL) {
-        XMEMSET(tmp, 0, hashSz);
-        localSalt = tmp;
-        saltSz    = hashSz;
-    }
-
-    do {
-    ret = wc_HmacSetKey(&myHmac, type, localSalt, saltSz);
-    if (ret != 0)
-        break;
-    ret = wc_HmacUpdate(&myHmac, inKey, inKeySz);
-    if (ret != 0)
-        break;
-    ret = wc_HmacFinal(&myHmac,  prk);
-    } while (0);
-
-    if (ret == 0) {
-        while (outIdx < outSz) {
-            int    tmpSz = (n == 1) ? 0 : hashSz;
-            word32 left = outSz - outIdx;
-
-            ret = wc_HmacSetKey(&myHmac, type, prk, hashSz);
-            if (ret != 0)
-                break;
-            ret = wc_HmacUpdate(&myHmac, tmp, tmpSz);
-            if (ret != 0)
-                break;
-            ret = wc_HmacUpdate(&myHmac, info, infoSz);
-            if (ret != 0)
-                break;
-            ret = wc_HmacUpdate(&myHmac, &n, 1);
-            if (ret != 0)
-                break;
-            ret = wc_HmacFinal(&myHmac, tmp);
-            if (ret != 0)
-                break;
-
-            left = min(left, (word32)hashSz);
-            XMEMCPY(out+outIdx, tmp, left);
-
-            outIdx += hashSz;
-            n++;
-        }
-    }
-
-#ifdef WOLFSSL_SMALL_STACK
-    XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-    XFREE(prk, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-#endif
-
-    return ret;
-}
-
-#endif /* HAVE_HKDF */
-
-#endif /* HAVE_FIPS */
-#endif /* NO_HMAC */
-