From d565cb612fec7c9c3aa1b7eb1999e7ed36a46eec Mon Sep 17 00:00:00 2001
From: Carlos O'Ryan <coryan@google.com>
Date: Sat, 6 Jul 2024 15:58:11 +0000
Subject: [PATCH] fix: workaround missing SHA256 macros in MinGW-w64 (#14437)

---
 google/cloud/internal/sha256_hash.cc | 5 +++++
 google/cloud/internal/sha256_hmac.cc | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/google/cloud/internal/sha256_hash.cc b/google/cloud/internal/sha256_hash.cc
index 1485c7ce45912..7b1bb32b9d4b6 100644
--- a/google/cloud/internal/sha256_hash.cc
+++ b/google/cloud/internal/sha256_hash.cc
@@ -30,6 +30,11 @@ namespace {
 Sha256Type Sha256Hash(void const* data, std::size_t count) {
   Sha256Type hash;
 #ifdef _WIN32
+// Workaround missing macros in MinGW-w64:
+//     https://github.com/mingw-w64/mingw-w64/issues/49
+#ifndef BCRYPT_SHA256_ALG_HANDLE
+#define BCRYPT_SHA256_ALG_HANDLE ((BCRYPT_ALG_HANDLE)0x00000041)
+#endif
   BCryptHash(BCRYPT_SHA256_ALG_HANDLE, nullptr, 0,
              static_cast<PUCHAR>(const_cast<void*>(data)),
              static_cast<ULONG>(count), hash.data(),
diff --git a/google/cloud/internal/sha256_hmac.cc b/google/cloud/internal/sha256_hmac.cc
index 015649fa7465f..1dc968c54681f 100644
--- a/google/cloud/internal/sha256_hmac.cc
+++ b/google/cloud/internal/sha256_hmac.cc
@@ -38,6 +38,11 @@ Sha256Type Sha256HmacImpl(absl::Span<T const> key, unsigned char const* data,
                           std::size_t count) {
   Sha256Type hash;
 #ifdef _WIN32
+// Workaround missing macros in MinGW-w64:
+//     https://github.com/mingw-w64/mingw-w64/issues/49
+#ifndef BCRYPT_HMAC_SHA256_ALG_HANDLE
+#define BCRYPT_HMAC_SHA256_ALG_HANDLE ((BCRYPT_ALG_HANDLE)0x000000b1)
+#endif
   BCryptHash(BCRYPT_HMAC_SHA256_ALG_HANDLE,
              reinterpret_cast<PUCHAR>(const_cast<T*>(key.data())),
              static_cast<ULONG>(key.size()), const_cast<PUCHAR>(data),