feat: add gmssl headers

include/gmssl/gcm.h

@@ -0,0 +1,73 @@
+/*
+ *  Copyright 2014-2022 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_GCM_H
+#define GMSSL_GCM_H
+
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <gmssl/gf128.h>
+#include <gmssl/block_cipher.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define GCM_IV_MIN_SIZE		1
+#define GCM_IV_MAX_SIZE		((uint64_t)(1 << (64-3)))
+#define GCM_IV_DEFAULT_BITS	96
+#define GCM_IV_DEFAULT_SIZE	12
+
+#define GCM_MIN_AAD_SIZE	0
+#define GCM_MAX_AAD_SIZE	((uint64_t)(1 << (64-3)))
+
+#define GCM_MIN_PLAINTEXT_SIZE	0
+#define GCM_MAX_PLAINTEXT_SIZE	((((uint64_t)1 << 39) - 256) >> 3)
+
+
+#define GHASH_SIZE		(16)
+
+
+#define GCM_IS_LITTLE_ENDIAN 1
+
+
+void ghash(const uint8_t h[16], const uint8_t *aad, size_t aadlen,
+	const uint8_t *c, size_t clen, uint8_t out[16]);
+
+typedef struct {
+	gf128_t H;
+	gf128_t X;
+	size_t aadlen;
+	size_t clen;
+	uint8_t block[16];
+	size_t num;
+} GHASH_CTX;
+
+void ghash_init(GHASH_CTX *ctx, const uint8_t h[16], const uint8_t *aad, size_t aadlen);
+void ghash_update(GHASH_CTX *ctx, const uint8_t *c, size_t clen);
+void ghash_finish(GHASH_CTX *ctx, uint8_t out[16]);
+
+
+int gcm_encrypt(const BLOCK_CIPHER_KEY *key, const uint8_t *iv, size_t ivlen,
+	const uint8_t *aad, size_t aadlen, const uint8_t *in, size_t inlen,
+	uint8_t *out, size_t taglen, uint8_t *tag);
+
+int gcm_decrypt(const BLOCK_CIPHER_KEY *key, const uint8_t *iv, size_t ivlen,
+	const uint8_t *aad, size_t aadlen, const uint8_t *in, size_t inlen,
+	const uint8_t *tag, size_t taglen, uint8_t *out);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif