1 files changed, 48 insertions, 0 deletions
diff --git a/third_party/wasm2c/src/sha256.cc b/third_party/wasm2c/src/sha256.cc
new file mode 100644
index 0000000000..efcb27a1e6
--- /dev/null
+++ b/third_party/wasm2c/src/sha256.cc
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2017 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wabt/sha256.h"
+
+#if HAVE_OPENSSL_SHA_H
+#include <openssl/sha.h>
+#else
+#include "picosha2.h"
+#endif
+
+namespace wabt {
+
+/**
+ * SHA-256 the "input" sv into the output "digest".
+ *
+ * Uses OpenSSL's libcrypto or vendored PicoSHA2.
+ */
+void sha256(std::string_view input, std::string& digest) {
+  digest.clear();
+
+#if HAVE_OPENSSL_SHA_H
+  digest.resize(SHA256_DIGEST_LENGTH);
+  if (!SHA256(reinterpret_cast<const uint8_t*>(input.data()), input.size(),
+              reinterpret_cast<uint8_t*>(digest.data()))) {
+    // should not be possible to fail here, but check (and abort) just in case
+    abort();
+  }
+#else
+  digest.resize(picosha2::k_digest_size);
+  picosha2::hash256(input, digest);
+#endif
+}
+
+}  // namespace wabt