Support SM3 third-party implementation

include/gmssl/sm3_digest.h

@@ -0,0 +1,40 @@
+/*
+ *  Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+
+#ifndef GMSSL_SM3_DIGEST_H
+#define GMSSL_SM3_DIGEST_H
+
+#include <string.h>
+#include <stdint.h>
+#include <gmssl/sm3.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef struct {
+	union {
+		SM3_CTX sm3_ctx;
+		SM3_HMAC_CTX hmac_ctx;
+		void *handle;
+	};
+	int state;
+} SM3_DIGEST_CTX;
+
+int sm3_digest_init(SM3_DIGEST_CTX *ctx, const uint8_t *key, size_t keylen);
+int sm3_digest_update(SM3_DIGEST_CTX *ctx, const uint8_t *data, size_t datalen);
+int sm3_digest_finish(SM3_DIGEST_CTX *ctx, uint8_t dgst[SM3_DIGEST_SIZE]);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif