aboutsummaryrefslogtreecommitdiff
path: root/src/internal/impl/bcrypt.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/internal/impl/bcrypt.c')
-rw-r--r--src/internal/impl/bcrypt.c297
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
generated by cgit (git 2.46.0) at 2024-10-02 18:16:35 +0000