SM3: Add SM3 hash function

SM3 is a secure hash function which is part of the Chinese
"Commercial Cryptography" suite of algorithms which use is
required for certain commercial applications in China.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4616)

1 files changed, 55 insertions, 0 deletions

diff --git a/crypto/evp/m_sm3.c b/crypto/evp/m_sm3.c
new file mode 100644
index 0000000000..21ee1de136
--- /dev/null
+++ b/crypto/evp/m_sm3.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2017 Ribose Inc. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/cryptlib.h"
+
+#ifndef OPENSSL_NO_SM3
+
+# include <openssl/evp.h>
+# include <openssl/objects.h>
+# include <openssl/sm3.h>
+# include "internal/evp_int.h"
+
+static int init(EVP_MD_CTX *ctx)
+{
+    return SM3_Init(EVP_MD_CTX_md_data(ctx));
+}
+
+static int update(EVP_MD_CTX *ctx, const void *data, size_t count)
+{
+    return SM3_Update(EVP_MD_CTX_md_data(ctx), data, count);
+}
+
+static int final(EVP_MD_CTX *ctx, unsigned char *md)
+{
+    return SM3_Final(md, EVP_MD_CTX_md_data(ctx));
+}
+
+static const EVP_MD sm3_md = {
+    NID_sm3,
+    NID_sm3WithRSAEncryption,
+    SM3_DIGEST_LENGTH,
+    0,
+    init,
+    update,
+    final,
+    NULL,
+    NULL,
+    SM3_CBLOCK,
+    sizeof(EVP_MD *) + sizeof(SM3_CTX),
+};
+
+const EVP_MD *EVP_sm3(void)
+{
+    return &sm3_md;
+}
+#endif
+