1 files changed, 56 insertions, 0 deletions
diff --git a/compat/crypt_openssl/sha256.c b/compat/crypt_openssl/sha256.c
new file mode 100644
index 000000000000..a1595835d2fe
--- /dev/null
+++ b/compat/crypt_openssl/sha256.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (c) 2023 Canonical Ltd.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "sha256.h"
+
+#include "openssl/evp.h"
+
+/* SHA-256 initialization.  Begins a SHA-256 operation. */
+void
+dhcpcd_SHA256_Init(SHA256_CTX *ctx)
+{
+	ctx->c = EVP_MD_CTX_new();
+	EVP_DigestInit_ex2(ctx->c, EVP_sha256(), NULL);
+}
+
+/* Add bytes into the hash */
+void
+dhcpcd_SHA256_Update(SHA256_CTX *ctx, const void *in, size_t len)
+{
+	EVP_DigestUpdate(ctx->c, in, len);
+}
+
+/*
+ * SHA-256 finalization.  Pads the input data, exports the hash value,
+ * and clears the context state.
+ */
+void
+dhcpcd_SHA256_Final(unsigned char digest[32], SHA256_CTX *ctx)
+{
+	EVP_DigestFinal_ex(ctx->c, digest, NULL);
+	EVP_MD_CTX_free(ctx->c);
+}