remove exposed .h crypto headers

nostr_core/nip004.c

@@ -6,13 +6,24 @@
 #include "nip004.h"
 #include "utils.h"
 #include "nostr_common.h"
-#include "crypto/nostr_secp256k1.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-// Include our AES implementation
-#include "crypto/nostr_aes.h"
+// Forward declarations for crypto functions (private API)
+// These functions are implemented in crypto/ but not exposed through public headers
+int ecdh_shared_secret(const unsigned char* private_key, const unsigned char* public_key, unsigned char* shared_secret);
+int nostr_secp256k1_get_random_bytes(unsigned char* buf, size_t len);
+
+// AES context and functions for NIP-04 encryption
+struct AES_ctx {
+    unsigned char RoundKey[240];  // AES-256 key expansion
+    unsigned char Iv[16];         // Initialization vector
+};
+
+void AES_init_ctx_iv(struct AES_ctx* ctx, const unsigned char* key, const unsigned char* iv);
+void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, unsigned char* buf, size_t length);
+void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, unsigned char* buf, size_t length);
 
 // Forward declarations for internal functions
 static int aes_cbc_encrypt(const unsigned char* key, const unsigned char* iv,