remove exposed .h crypto headers

nostr_core/utils.h

@@ -45,6 +45,30 @@ void nostr_crypto_cleanup(void);
 // SHA-256 hash function
 int nostr_sha256(const unsigned char *data, size_t len, unsigned char *hash);
 
+// =============================================================================
+// STREAMING SHA-256 FUNCTIONS
+// =============================================================================
+
+// SHA-256 streaming context
+typedef struct {
+    uint32_t state[8];      // Current hash state
+    unsigned char buffer[64]; // Input buffer for incomplete blocks
+    uint64_t bitlen;        // Total bits processed
+    size_t buflen;          // Current buffer length
+} nostr_sha256_ctx_t;
+
+// Initialize SHA-256 streaming context
+int nostr_sha256_init(nostr_sha256_ctx_t* ctx);
+
+// Update SHA-256 context with new data
+int nostr_sha256_update(nostr_sha256_ctx_t* ctx, const unsigned char* data, size_t len);
+
+// Finalize SHA-256 and output hash
+int nostr_sha256_final(nostr_sha256_ctx_t* ctx, unsigned char* hash);
+
+// Stream SHA-256 hash of a file
+int nostr_sha256_file_stream(const char* filename, unsigned char* hash);
+
 // HMAC-SHA256
 int nostr_hmac_sha256(const unsigned char *key, size_t key_len,
                       const unsigned char *data, size_t data_len,