text: /*************************************************************************/
  /*  crypto_mbedtls.h                                                     */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           Valjang Engine                                */
  /*                      http://Valjang.fr                          */
  /*************************************************************************/
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  /*************************************************************************/
  
  #ifndef CRYPTO_MBEDTLS_H
  #define CRYPTO_MBEDTLS_H
  
  #include "core/crypto/crypto.h"
  #include "core/resource.h"
  
  #include <mbedtls/ctr_drbg.h>
  #include <mbedtls/entropy.h>
  #include <mbedtls/ssl.h>
  
  class CryptoMbedTLS;
  class SSLContextMbedTLS;
  class CryptoKeyMbedTLS : public CryptoKey {
  private:
  	mbedtls_pk_context pkey;
  	int locks = 0;
  	bool public_only = true;
  
  public:
  	static CryptoKey *create();
  	static void make_default() { CryptoKey::_create = create; }
  	static void finalize() { CryptoKey::_create = nullptr; }
  
  	virtual Error load(String p_path, bool p_public_only);
  	virtual Error save(String p_path, bool p_public_only);
  	virtual String save_to_string(bool p_public_only);
  	virtual Error load_from_string(String p_string_key, bool p_public_only);
  	virtual bool is_public_only() const { return public_only; };
  
  	CryptoKeyMbedTLS() {
  		mbedtls_pk_init(&pkey);
  		locks = 0;
  	}
  	~CryptoKeyMbedTLS() {
  		mbedtls_pk_free(&pkey);
  	}
  
  	_FORCE_INLINE_ void lock() { locks++; }
  	_FORCE_INLINE_ void unlock() { locks--; }
  
  	friend class CryptoMbedTLS;
  	friend class SSLContextMbedTLS;
  };
  
  class X509CertificateMbedTLS : public X509Certificate {
  private:
  	mbedtls_x509_crt cert;
  	int locks;
  
  public:
  	static X509Certificate *create();
  	static void make_default() { X509Certificate::_create = create; }
  	static void finalize() { X509Certificate::_create = nullptr; }
  
  	virtual Error load(String p_path);
  	virtual Error load_from_memory(const uint8_t *p_buffer, int p_len);
  	virtual Error save(String p_path);
  
  	X509CertificateMbedTLS() {
  		mbedtls_x509_crt_init(&cert);
  		locks = 0;
  	}
  	~X509CertificateMbedTLS() {
  		mbedtls_x509_crt_free(&cert);
  	}
  
  	_FORCE_INLINE_ void lock() { locks++; }
  	_FORCE_INLINE_ void unlock() { locks--; }
  
  	friend class CryptoMbedTLS;
  	friend class SSLContextMbedTLS;
  };
  
  class CryptoMbedTLS : public Crypto {
  private:
  	mbedtls_entropy_context entropy;
  	mbedtls_ctr_drbg_context ctr_drbg;
  	static X509CertificateMbedTLS *default_certs;
  	mbedtls_md_type_t _md_type_from_hashtype(HashingContext::HashType p_hash_type, int &r_size);
  
  public:
  	static Crypto *create();
  	static void initialize_crypto();
  	static void finalize_crypto();
  	static X509CertificateMbedTLS *get_default_certificates();
  	static void load_default_certificates(String p_path);
  
  	virtual PackedByteArray generate_random_bytes(int p_bytes);
  	virtual Ref<CryptoKey> generate_rsa(int p_bytes);
  	virtual Ref<X509Certificate> generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after);
  	virtual Vector<uint8_t> sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key);
  	virtual bool verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key);
  	virtual Vector<uint8_t> encrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_plaintext);
  	virtual Vector<uint8_t> decrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_ciphertext);
  
  	CryptoMbedTLS();
  	~CryptoMbedTLS();
  };
  
  #endif // CRYPTO_MBEDTLS_H
  