refactor!: MbedTLS on Windows, switch to uint32

1 files changed, 0 insertions, 297 deletions

diff --git a/src/internal/impl/bcrypt.c b/src/internal/impl/bcrypt.c
deleted file mode 100644
index 8ae6c5a..0000000
--- a/src/internal/impl/bcrypt.c
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
-* Copyright (c) 2024 Vaughn Nugent
-*
-* Package: noscrypt
-* File: impl/bcrypt.c
-*
-* This library is free software; you can redistribute it and/or
-* modify it under the terms of the GNU Lesser General Public License
-* as published by the Free Software Foundation; either version 2.1
-* of the License, or  (at your option) any later version.
-*
-* This library 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
-* Lesser General Public License for more details.
-*
-* You should have received a copy of the GNU Lesser General Public License
-* along with noscrypt. If not, see http://www.gnu.org/licenses/.
-*/
-
-
-/*
-*	This file provides as many fallback implementations on Windows plaforms
-*	as possible using the bcrypt library. This file should be included behind
-*	other libarry implementations, as it is a fallback.
-*/
-
-#ifdef _NC_IS_WINDOWS
-
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-#include <bcrypt.h>
-
-#include "../../platform.h"
-#include "../nc-util.h"
-
-#define IF_BC_FAIL(x) if(!BCRYPT_SUCCESS(x))
-
-struct _bcrypt_ctx
-{
-	BCRYPT_ALG_HANDLE hAlg;
-	BCRYPT_HASH_HANDLE hHash;
-};
-
-_IMPLSTB NTSTATUS _bcInitSha256(struct _bcrypt_ctx* ctx, DWORD flags)
-{
-	NTSTATUS result;
-
-	result = BCryptOpenAlgorithmProvider(
-		&ctx->hAlg, 
-		BCRYPT_SHA256_ALGORITHM, 
-		NULL, 
-		flags
-	);
-
-	/*
-	*  If operation failed, ensure the algorithm handle is null
-	* to make free code easier to cleanup
-	*/
-	if (!BCRYPT_SUCCESS(result))
-	{
-		ctx->hAlg = NULL;
-	}
-
-	return result;
-}
-
-_IMPLSTB NTSTATUS _bcCreateHmac(struct _bcrypt_ctx* ctx, const cspan_t* key)
-{
-	/*
-	 * NOTE: 
-	 * I am not explicitly managing the hash object buffer. By setting 
-	 * the hash object to NULL, and length to 0, the buffer will be
-	 * managed by the bcrypt library.
-	 * 
-	 * See: https://learn.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptcreatehash
-	 */
-
-	return BCryptCreateHash(
-		ctx->hAlg, 
-		&ctx->hHash, 
-		NULL, 
-		0, 
-		(uint8_t*)key->data, 
-		key->size, 
-		BCRYPT_HASH_REUSABLE_FLAG	/* Enable reusable for expand function */
-	);
-}
-
-_IMPLSTB NTSTATUS _bcCreate(struct _bcrypt_ctx* ctx)
-{
-	cspan_t key;
-	
-	/* Zero out key span for 0 size and NULL data ptr */
-	SecureZeroMemory(&key, sizeof(cspan_t));
-
-	return _bcCreateHmac(ctx, &key);
-}
-
-_IMPLSTB NTSTATUS _bcHashDataRaw(const struct _bcrypt_ctx* ctx, const uint8_t* data, uint64_t len)
-{
-	return BCryptHashData(ctx->hHash, (uint8_t*)data, len, 0);
-}
-
-_IMPLSTB NTSTATUS _bcHashData(const struct _bcrypt_ctx* ctx, const cspan_t* data)
-{
-	return _bcHashDataRaw(ctx, data->data, data->size);
-}
-
-_IMPLSTB NTSTATUS _bcFinishHash(const struct _bcrypt_ctx* ctx, sha256_t digestOut32)
-{
-	return BCryptFinishHash(ctx->hHash, digestOut32, sizeof(sha256_t), 0);
-}
-
-_IMPLSTB void _bcDestroyCtx(struct _bcrypt_ctx* ctx)
-{
-	/* Free the hash memory if it was allocated */
-	if(ctx->hHash) BCryptDestroyHash(ctx->hHash);
-	
-	/* Close the algorithm provider */
-	if (ctx->hAlg) BCryptCloseAlgorithmProvider(ctx->hAlg, 0);
-
-	ctx->hAlg = NULL;
-	ctx->hHash = NULL;
-}
-
-#ifndef _IMPL_SECURE_ZERO_MEMSET
-	/*
-	* On Windows, we can use SecureZeroMemory
-	* as platform zeroing function.
-	*
-	* NOTE:
-	* SecureZeroMemory2 uses volitle function argument
-	* pointers, which is a contested mehtod of compiler
-	* optimization prevention. GNU seems to oppose this method
-	*
-	* https://learn.microsoft.com/en-us/windows/win32/memory/winbase-securezeromemory2
-	*/
-	#define _IMPL_SECURE_ZERO_MEMSET SecureZeroMemory
-#endif /* !_IMPL_SECURE_ZERO_MEMSET */
-
-/*
-* Provide win32 fallback for sha256 digest if needed
-*/
-
-#ifndef _IMPL_CRYPTO_SHA256_DIGEST
-	
-	/* Export function fallack */
-	#define _IMPL_CRYPTO_SHA256_DIGEST			_bcrypt_sha256_digest	
-
-	_IMPLSTB cstatus_t _bcrypt_sha256_digest(const cspan_t* data, sha256_t digestOut32)
-	{
-		cstatus_t result;
-		struct _bcrypt_ctx ctx;
-
-		result = CSTATUS_FAIL;	/* Start in fail state */
-
-		IF_BC_FAIL(_bcInitSha256(&ctx, 0)) goto Exit;
-
-		IF_BC_FAIL(_bcCreate(&ctx)) goto Exit;
-
-		IF_BC_FAIL(_bcHashData(&ctx, data)) goto Exit;
-	
-		IF_BC_FAIL(_bcFinishHash(&ctx, digestOut32)) goto Exit;
-
-		result = CSTATUS_OK;	/* Hash operation completed, so set success */
-
-	Exit:
-
-		_bcDestroyCtx(&ctx);
-
-		return result;
-	}
-
-#endif /* !_IMPL_CRYPTO_SHA256_DIGEST */
-
-#ifndef _IMPL_CRYPTO_SHA256_HMAC
-
-	/* Export function */
-	#define _IMPL_CRYPTO_SHA256_HMAC				_bcrypt_hmac_sha256	
-	
-	_IMPLSTB cstatus_t _bcrypt_hmac_sha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32)
-	{
-		cstatus_t result;
-		struct _bcrypt_ctx ctx;
-
-		result = CSTATUS_FAIL;		/* Start in fail state */
-
-		/* Init context with hmac flag set */
-		IF_BC_FAIL(_bcInitSha256(&ctx, BCRYPT_ALG_HANDLE_HMAC_FLAG)) goto Exit;
-
-		IF_BC_FAIL(_bcCreateHmac(&ctx, key)) goto Exit;
-
-		IF_BC_FAIL(_bcHashData(&ctx, data)) goto Exit;
-
-		IF_BC_FAIL(_bcFinishHash(&ctx, hmacOut32)) goto Exit;
-
-		result = CSTATUS_OK;	/* HMAC operation completed, so set success */
-
-	Exit:
-		
-		_bcDestroyCtx(&ctx);
-
-		return result;
-	}
-
-#endif /* !_IMPL_CRYPTO_SHA256_HMAC */
-
-/*
-* Provide a fallback HKDF expand function using the
-* HMAC function as a base.
-*/
-
-#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND
-
-	#define _IMPL_CRYPTO_SHA256_HKDF_EXPAND		_fallbackHkdfExpand
-
-	/* Include string for memmove */
-	#include <string.h>
-
-	static void ncWriteSpanS(span_t* span, uint64_t offset, const uint8_t* data, uint64_t size)
-	{
-		DEBUG_ASSERT2(span != NULL, "Expected span to be non-null")
-		DEBUG_ASSERT2(data != NULL, "Expected data to be non-null")
-		DEBUG_ASSERT2(offset + size <= span->size, "Expected offset + size to be less than span size")
-
-		/* Copy data to span */
-		memmove(span->data + offset, data, size);
-	}
-
-	STATIC_ASSERT(HKDF_IN_BUF_SIZE > SHA256_DIGEST_SIZE, "HDK Buffer must be at least the size of the underlying hashing alg output")
-
-	/*
-	* The following functions implements the HKDF expand function using an existing 
-	* HMAC function. This is a fallback implementation for Windows platforms at the moment.
-	* 
-	* This follows the guidence from RFC 5869: https://tools.ietf.org/html/rfc5869
-	*/
-
-	#define _BC_MIN(a, b) (a < b ? a : b)
-
-	_IMPLSTB cstatus_t _fallbackHkdfExpand(const cspan_t* prk, const cspan_t* info, span_t* okm)
-	{
-		cstatus_t result;
-		struct _bcrypt_ctx ctx;
-
-		uint8_t counter;
-		uint64_t tLen, okmOffset;
-		uint8_t t[HKDF_IN_BUF_SIZE];
-
-		_IMPL_SECURE_ZERO_MEMSET(t, sizeof(t));
-		
-		tLen = 0;				/* T(0) is an empty string(zero length) */
-		okmOffset = 0;
-		result = CSTATUS_FAIL;	/* Start in fail state */
-
-		/* Init context with hmac flag set, it will be reused */
-		IF_BC_FAIL(_bcInitSha256(&ctx, BCRYPT_ALG_HANDLE_HMAC_FLAG)) goto Exit;
-
-		/* Set hmac key to the prk, alg is set to reusable */
-		IF_BC_FAIL(_bcCreateHmac(&ctx, prk)) goto Exit;
-
-		/* Compute T(N) = HMAC(prk, T(n-1) | info | n) */
-		for (counter = 1; okmOffset < okm->size; counter++)
-		{
-			IF_BC_FAIL(_bcHashDataRaw(&ctx, t, tLen)) goto Exit;
-			IF_BC_FAIL(_bcHashData(&ctx, info)) goto Exit;
-			IF_BC_FAIL(_bcHashDataRaw(&ctx, &counter, sizeof(counter))) goto Exit;
-
-			/* Write current hash state to t buffer */
-			IF_BC_FAIL(_bcFinishHash(&ctx, t)) goto Exit;
-
-			/* Set the length of the current hash state */
-			tLen = _BC_MIN(okm->size - okmOffset, SHA256_DIGEST_SIZE);
-
-			DEBUG_ASSERT(tLen <= sizeof(t));
-			DEBUG_ASSERT((tLen + okmOffset) < okm->size);
-
-			/* write the T buffer back to okm */
-			ncWriteSpanS(okm, okmOffset, t, tLen);
-
-			/* shift base okm pointer by T */
-			okmOffset += tLen;
-		}		
-
-		result = CSTATUS_OK;	/* HMAC operation completed, so set success */
-
-	Exit:
-
-		_bcDestroyCtx(&ctx);
-
-		return result;
-	}
-
-#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */
-
-#endif /* _NC_IS_WINDOWS */
\ No newline at end of file