Support SM3 third-party implementation

src/sm3_digest.c

@@ -0,0 +1,80 @@
+/*
+ *  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
+ */
+
+
+#include <string.h>
+#include <gmssl/sm3_digest.h>
+#include <gmssl/error.h>
+
+
+int sm3_digest_init(SM3_DIGEST_CTX *ctx, const uint8_t *key, size_t keylen)
+{
+	if (!ctx) {
+		error_print();
+		return -1;
+	}
+
+	memset(ctx, 0, sizeof(*ctx));
+
+	if (!key) {
+		sm3_init(&ctx->sm3_ctx);
+		ctx->state = 1;
+	} else {
+		if (keylen < 12 || keylen > 64) {
+			error_print();
+			return -1;
+		}
+		sm3_hmac_init(&ctx->hmac_ctx, key, keylen);
+		ctx->state = 2;
+	}
+
+	return 1;
+}
+
+int sm3_digest_update(SM3_DIGEST_CTX *ctx, const uint8_t *data, size_t datalen)
+{
+	if (!ctx) {
+		error_print();
+		return -1;
+	}
+	if (!data || !datalen) {
+		error_print();
+		return -1;
+	}
+
+	if (ctx->state == 1) {
+		sm3_update(&ctx->sm3_ctx, data, datalen);
+	} else if (ctx->state == 2) {
+		sm3_hmac_update(&ctx->hmac_ctx, data, datalen);
+	} else {
+		error_print();
+		return -1;
+	}
+	return 1;
+}
+
+int sm3_digest_finish(SM3_DIGEST_CTX *ctx, uint8_t dgst[SM3_DIGEST_SIZE])
+{
+	if (!ctx || !dgst) {
+		error_print();
+		return -1;
+	}
+
+	if (ctx->state == 1) {
+		sm3_finish(&ctx->sm3_ctx, dgst);
+	} else if (ctx->state == 2) {
+		sm3_hmac_finish(&ctx->hmac_ctx, dgst);
+	} else {
+		error_print();
+		return -1;
+	}
+
+	memset(ctx, 0, sizeof(*ctx));
+	return 1;
+}