Use SDF as the crypto provider in SM2/3/4 CTX API

cmake .. -DENABLE_CRYPTO_SDF=ON

include/gmssl/sdf.h

@@ -34,6 +34,27 @@ typedef struct {
 	int index;
 } SDF_KEY;
 
+typedef struct {
+	void *hSession;
+} SDF_SM3_CTX;
+
+typedef struct {
+	void *hSession;
+	void *hKey;
+} SDF_SM4_KEY;
+
+typedef struct {
+	uint32_t index;
+	uint8_t passlen;
+	unsigned char pass[26 + 1];
+} SDF_ENC_PRIVATE_KEY;
+
+typedef struct {
+	uint32_t index;
+	uint8_t passlen;
+	unsigned char pass[26 + 1];
+} SDF_PRIVATE_KEY;
+
 
 int sdf_load_library(const char *so_path, const char *vendor);
 int sdf_open_device(SDF_DEVICE *dev);

include/gmssl/sm3.h

@@ -75,7 +75,6 @@ typedef struct {
 	union {
 		SM3_CTX sm3_ctx;
 		SM3_HMAC_CTX hmac_ctx;
-		void *handle;
 	};
 	int state;
 } SM3_DIGEST_CTX;

include/gmssl/sm4.h

@@ -51,10 +51,7 @@ void sm4_ctr32_encrypt(const SM4_KEY *key, uint8_t ctr[16], const uint8_t *in, s
 
 
 typedef struct {
-	union {
-		SM4_KEY sm4_key;
-		void *handle;
-	};
+	SM4_KEY sm4_key;
 	uint8_t iv[SM4_BLOCK_SIZE];
 	uint8_t block[SM4_BLOCK_SIZE];
 	size_t block_nbytes;