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README.md
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# NOSTR Core Library
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A comprehensive, production-ready C library for NOSTR protocol implementation with OpenSSL-based cryptography and extensive protocol support.
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[](VERSION)
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[](#license)
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[](#building)
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## 🚀 Features
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### Core Protocol Support
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- **NIP-01**: Basic protocol flow - event creation, signing, and validation
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- **NIP-04**: Encrypted direct messages (ECDH + AES-CBC + Base64)
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- **NIP-05**: DNS-based internet identifier verification
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- **NIP-06**: Key derivation from mnemonic (BIP39/BIP32 compliant)
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- **NIP-11**: Relay information documents
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- **NIP-13**: Proof of Work for events
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- **NIP-44**: Versioned encrypted direct messages (ECDH + ChaCha20 + HMAC)
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### Cryptographic Features
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- **OpenSSL-Based**: Production-grade cryptography with OpenSSL backend
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- **Secp256k1**: Complete elliptic curve implementation bundled
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- **BIP39**: Mnemonic phrase generation and validation
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- **BIP32**: Hierarchical deterministic key derivation
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- **ChaCha20**: Stream cipher for NIP-44 encryption
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- **AES-CBC**: Block cipher for NIP-04 encryption
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- **Schnorr Signatures**: BIP-340 compliant signing and verification
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### Networking & Relay Support
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- **Multi-Relay Queries**: Synchronous querying with progress callbacks
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- **Relay Pools**: Asynchronous connection management with statistics
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- **OpenSSL WebSocket Communication**: Full relay protocol support with TLS
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- **NIP-05 Identifier Verification**: DNS-based identity resolution
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- **NIP-11 Relay Information**: Automatic relay capability discovery
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- **Event Deduplication**: Automatic handling of duplicate events across relays
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- **Connection Management**: Automatic reconnection and error handling
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### Developer Experience
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- **Minimal Dependencies**: Only requires OpenSSL, standard C library and math library
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- **Thread-Safe**: Core cryptographic functions are stateless
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- **Cross-Platform**: Builds on Linux, macOS, Windows
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- **Comprehensive Examples**: Ready-to-run demonstration programs
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- **Automatic Versioning**: Git-tag based version management
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## 📦 Quick Start
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### Installation
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1. **Clone the repository:**
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```bash
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git clone https://github.com/yourusername/nostr_core_lib.git
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cd nostr_core_lib
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```
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2. **Build the library:**
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```bash
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./build.sh lib
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```
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3. **Run examples:**
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```bash
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./build.sh examples
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./examples/simple_keygen
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```
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### Usage Example
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```c
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#include "nostr_core/nostr_core.h"
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#include <stdio.h>
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int main() {
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// Initialize library
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if (nostr_init() != NOSTR_SUCCESS) {
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fprintf(stderr, "Failed to initialize NOSTR library\n");
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return 1;
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}
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// Generate keypair
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unsigned char private_key[32], public_key[32];
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nostr_generate_keypair(private_key, public_key);
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// Convert to bech32 format
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char nsec[100], npub[100];
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nostr_key_to_bech32(private_key, "nsec", nsec);
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nostr_key_to_bech32(public_key, "npub", npub);
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printf("Private key: %s\n", nsec);
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printf("Public key: %s\n", npub);
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// Create and sign event
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cJSON* event = nostr_create_and_sign_event(1, "Hello NOSTR!", NULL, private_key, 0);
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if (event) {
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char* json = cJSON_Print(event);
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printf("Event: %s\n", json);
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free(json);
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cJSON_Delete(event);
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}
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nostr_cleanup();
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return 0;
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}
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```
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**Compile and run:**
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```bash
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gcc example.c -o example ./libnostr_core.a -lm
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./example
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```
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## 🏗️ Building
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### Build Targets
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```bash
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./build.sh lib # Build static library (default)
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./build.sh examples # Build examples
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./build.sh test # Run test suite
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./build.sh clean # Clean build artifacts
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./build.sh install # Install to system
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```
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### Manual Building
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```bash
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# Build static library
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make
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# Build examples
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make examples
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# Run tests
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make test-crypto
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# Clean
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make clean
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```
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### Dependencies
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**Required:**
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- GCC or compatible C compiler
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- Standard C library
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- Math library (`-lm`)
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**Included & Embedded (x64):**
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- cJSON (JSON parsing)
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- secp256k1 (elliptic curve cryptography)
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- OpenSSL (complete cryptographic backend + TLS)
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- curl (HTTP/HTTPS for NIP-05/NIP-11)
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**ARM64 Additional Requirements:**
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- System OpenSSL libraries (`-lssl -lcrypto`)
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## 📚 API Documentation
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### Initialization
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```c
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int nostr_init(void); // Initialize library (call first)
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void nostr_cleanup(void); // Cleanup resources (call last)
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const char* nostr_strerror(int error); // Get error message
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```
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### Key Management
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```c
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// Generate random keypair
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int nostr_generate_keypair(unsigned char* private_key, unsigned char* public_key);
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// Generate from mnemonic
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int nostr_generate_mnemonic_and_keys(char* mnemonic, size_t mnemonic_size,
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int account, unsigned char* private_key,
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unsigned char* public_key);
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// Derive from existing mnemonic
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int nostr_derive_keys_from_mnemonic(const char* mnemonic, int account,
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unsigned char* private_key, unsigned char* public_key);
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// Format conversion
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int nostr_key_to_bech32(const unsigned char* key, const char* hrp, char* output);
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nostr_input_type_t nostr_detect_input_type(const char* input);
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```
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### Event Creation
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```c
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// Create and sign event
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cJSON* nostr_create_and_sign_event(int kind, const char* content, cJSON* tags,
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const unsigned char* private_key, time_t timestamp);
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// Add proof of work
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int nostr_add_proof_of_work(cJSON* event, const unsigned char* private_key,
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int target_difficulty, void (*progress_callback)(...), void* user_data);
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```
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### Encryption (NIP-04 & NIP-44)
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```c
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// NIP-04 (AES-CBC)
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int nostr_nip04_encrypt(const unsigned char* sender_private_key,
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const unsigned char* recipient_public_key,
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const char* plaintext, char* output, size_t output_size);
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int nostr_nip04_decrypt(const unsigned char* recipient_private_key,
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const unsigned char* sender_public_key,
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const char* encrypted_data, char* output, size_t output_size);
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// NIP-44 (ChaCha20)
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int nostr_nip44_encrypt(const unsigned char* sender_private_key,
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const unsigned char* recipient_public_key,
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const char* plaintext, char* output, size_t output_size);
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int nostr_nip44_decrypt(const unsigned char* recipient_private_key,
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const unsigned char* sender_public_key,
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const char* encrypted_data, char* output, size_t output_size);
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```
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### Relay Communication
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```c
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// Simple relay query
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cJSON* nostr_query_relay_for_event(const char* relay_url, const char* pubkey_hex, int kind);
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// Multi-relay synchronous queries
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cJSON** synchronous_query_relays_with_progress(const char** relay_urls, int relay_count,
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cJSON* filter, relay_query_mode_t mode,
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int* result_count, int relay_timeout_seconds,
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relay_progress_callback_t callback, void* user_data);
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// Multi-relay publishing
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publish_result_t* synchronous_publish_event_with_progress(const char** relay_urls, int relay_count,
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cJSON* event, int* success_count,
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int relay_timeout_seconds,
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publish_progress_callback_t callback, void* user_data);
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```
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### Relay Pools (Asynchronous)
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```c
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// Create and manage relay pool
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nostr_relay_pool_t* nostr_relay_pool_create(void);
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int nostr_relay_pool_add_relay(nostr_relay_pool_t* pool, const char* relay_url);
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void nostr_relay_pool_destroy(nostr_relay_pool_t* pool);
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// Subscribe to events
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nostr_pool_subscription_t* nostr_relay_pool_subscribe(
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nostr_relay_pool_t* pool, const char** relay_urls, int relay_count, cJSON* filter,
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void (*on_event)(cJSON* event, const char* relay_url, void* user_data),
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void (*on_eose)(void* user_data), void* user_data);
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// Run event loop
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int nostr_relay_pool_run(nostr_relay_pool_t* pool, int timeout_ms);
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int nostr_relay_pool_poll(nostr_relay_pool_t* pool, int timeout_ms);
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```
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### NIP-05 Identifier Verification
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```c
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// Lookup public key from NIP-05 identifier
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int nostr_nip05_lookup(const char* nip05_identifier, char* pubkey_hex_out,
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char*** relays, int* relay_count, int timeout_seconds);
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// Verify NIP-05 identifier against public key
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int nostr_nip05_verify(const char* nip05_identifier, const char* pubkey_hex,
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char*** relays, int* relay_count, int timeout_seconds);
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// Parse .well-known/nostr.json response
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int nostr_nip05_parse_well_known(const char* json_response, const char* local_part,
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char* pubkey_hex_out, char*** relays, int* relay_count);
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```
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### NIP-11 Relay Information
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```c
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// Fetch relay information document
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int nostr_nip11_fetch_relay_info(const char* relay_url, nostr_relay_info_t** info_out, int timeout_seconds);
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// Free relay information structure
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void nostr_nip11_relay_info_free(nostr_relay_info_t* info);
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```
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## 📁 Examples
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The library includes comprehensive examples:
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- **`simple_keygen`** - Basic key generation and formatting
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- **`keypair_generation`** - Advanced key management
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- **`mnemonic_generation`** - BIP39 mnemonic handling
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- **`mnemonic_derivation`** - NIP-06 key derivation
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- **`utility_functions`** - General utility demonstrations
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- **`input_detection`** - Input type detection and processing
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- **`version_test`** - Library version information
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Run all examples:
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```bash
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./build.sh examples
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ls -la examples/
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```
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## 🧪 Testing
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The library includes extensive tests:
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```bash
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# Run all tests
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./build.sh test
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# Individual test categories
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cd tests && make test
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```
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**Test Categories:**
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- **Core Functionality**: `simple_init_test`, `header_test`
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- **Cryptography**: `chacha20_test`, `nostr_crypto_test`
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- **NIP-04 Encryption**: `nip04_test`
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- **NIP-05 Identifiers**: `nip05_test`
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- **NIP-11 Relay Info**: `nip11_test`
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- **NIP-44 Encryption**: `nip44_test`, `nip44_debug_test`
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- **Key Derivation**: `nostr_test_bip32`
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- **Relay Communication**: `relay_pool_test`, `sync_test`
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- **HTTP/WebSocket**: `http_test`, `wss_test`
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- **Proof of Work**: `test_pow_loop`
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## 🏗️ Integration
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### Static Library Integration
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1. **Copy required files to your project:**
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```bash
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cp libnostr_core.a /path/to/your/project/
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cp nostr_core/nostr_core.h /path/to/your/project/
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```
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2. **Link in your project:**
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```bash
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gcc your_code.c -L. -lnostr_core -lm -o your_program
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```
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### Source Integration
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1. **Copy source files:**
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```bash
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cp -r nostr_core/ /path/to/your/project/
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cp -r cjson/ /path/to/your/project/
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```
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2. **Include in your build:**
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```bash
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gcc your_code.c nostr_core/*.c cjson/cJSON.c -lm -o your_program
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```
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### Self-Contained Library
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**x64 Library:** The `libnostr_core.a` file is completely self-contained with **no external dependencies**:
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- ✅ **All OpenSSL code embedded**
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- ✅ **No libwally required**
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- ✅ **No system secp256k1 required**
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- ✅ **Only needs math library (`-lm`)**
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```bash
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# x64 - This is all you need:
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gcc your_app.c ./libnostr_core.a -lm -o your_app
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```
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**ARM64 Library:** The `libnostr_core_arm64.a` requires system OpenSSL:
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```bash
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# ARM64 - Requires OpenSSL libraries:
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aarch64-linux-gnu-gcc your_app.c ./libnostr_core_arm64.a -lssl -lcrypto -lm -o your_app
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```
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## 🔧 Configuration
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### Compile-Time Options
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```c
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// Enable debug output
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#define NOSTR_DEBUG_ENABLED
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// Crypto-only build (no networking)
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#define NOSTR_CRYPTO_ONLY
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// Enable specific NIPs
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#define NOSTR_NIP04_ENABLED
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#define NOSTR_NIP44_ENABLED
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#define NOSTR_NIP13_ENABLED
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```
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### Build Flags
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```bash
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# Enable all logging
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make LOGGING_FLAGS="-DENABLE_FILE_LOGGING -DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING"
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# Debug build
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make debug
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# ARM64 cross-compile
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|
||||||
make arm64
|
|
||||||
```
|
|
||||||
|
|
||||||
## 🌐 Supported Platforms
|
|
||||||
|
|
||||||
- **Linux** (x86_64, ARM64)
|
|
||||||
- **macOS** (Intel, Apple Silicon)
|
|
||||||
- **Windows** (MinGW, MSYS2)
|
|
||||||
- **Embedded Systems** (resource-constrained environments)
|
|
||||||
|
|
||||||
## 📄 Documentation
|
|
||||||
|
|
||||||
- **[LIBRARY_USAGE.md](LIBRARY_USAGE.md)** - Detailed integration guide
|
|
||||||
- **[EXPORT_GUIDE.md](EXPORT_GUIDE.md)** - Library export instructions
|
|
||||||
- **[AUTOMATIC_VERSIONING.md](AUTOMATIC_VERSIONING.md)** - Version management
|
|
||||||
- **API Reference** - Complete documentation in `nostr_core/nostr_core.h`
|
|
||||||
|
|
||||||
## 🤝 Contributing
|
|
||||||
|
|
||||||
1. Fork the repository
|
|
||||||
2. Create a feature branch: `git checkout -b feature/amazing-feature`
|
|
||||||
3. Make your changes and add tests
|
|
||||||
4. Run the test suite: `./build.sh test`
|
|
||||||
5. Commit your changes: `git commit -m 'Add amazing feature'`
|
|
||||||
6. Push to the branch: `git push origin feature/amazing-feature`
|
|
||||||
7. Open a Pull Request
|
|
||||||
|
|
||||||
## 📈 Version History
|
|
||||||
|
|
||||||
Current version: **0.1.20**
|
|
||||||
|
|
||||||
The library uses automatic semantic versioning based on Git tags. Each build increments the patch version automatically.
|
|
||||||
|
|
||||||
**Recent Developments:**
|
|
||||||
- **OpenSSL Migration**: Transitioned from mbedTLS to OpenSSL for improved compatibility
|
|
||||||
- **NIP-05 Support**: DNS-based internet identifier verification
|
|
||||||
- **NIP-11 Support**: Relay information document fetching and parsing
|
|
||||||
- **Enhanced WebSocket**: OpenSSL-based TLS WebSocket communication
|
|
||||||
- **Production Ready**: Comprehensive test suite and error handling
|
|
||||||
|
|
||||||
**Version Timeline:**
|
|
||||||
- `v0.1.x` - Initial development releases
|
|
||||||
- Focus on core protocol implementation and OpenSSL-based crypto
|
|
||||||
- Full NIP-01, NIP-04, NIP-05, NIP-06, NIP-11, NIP-13, NIP-44 support
|
|
||||||
|
|
||||||
## 🐛 Troubleshooting
|
|
||||||
|
|
||||||
### Common Issues
|
|
||||||
|
|
||||||
**Build fails with secp256k1 errors:**
|
|
||||||
```bash
|
|
||||||
cd secp256k1
|
|
||||||
./autogen.sh
|
|
||||||
./configure --enable-module-schnorrsig --enable-module-ecdh
|
|
||||||
make
|
|
||||||
cd ..
|
|
||||||
./build.sh lib
|
|
||||||
```
|
|
||||||
|
|
||||||
**Library too large:**
|
|
||||||
The x64 library is intentionally large (~15MB) because it includes all secp256k1 cryptographic functions and OpenSSL for complete self-containment. The ARM64 library is smaller (~2.4MB) as it links against system OpenSSL.
|
|
||||||
|
|
||||||
**Linking errors:**
|
|
||||||
Make sure to include the math library:
|
|
||||||
```bash
|
|
||||||
gcc your_code.c ./libnostr_core.a -lm # Note the -lm flag
|
|
||||||
```
|
|
||||||
|
|
||||||
### Getting Help
|
|
||||||
|
|
||||||
- Check the `examples/` directory for working code
|
|
||||||
- Run `./build.sh test` to verify your environment
|
|
||||||
- Review the comprehensive API documentation in `nostr_core/nostr_core.h`
|
|
||||||
|
|
||||||
## 📜 License
|
|
||||||
|
|
||||||
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
|
|
||||||
|
|
||||||
## 🙏 Acknowledgments
|
|
||||||
|
|
||||||
- **NOSTR Protocol** - The decentralized social media protocol
|
|
||||||
- **OpenSSL** - Production-grade cryptographic library and TLS implementation
|
|
||||||
- **secp256k1** - Bitcoin's elliptic curve library
|
|
||||||
- **cJSON** - Lightweight JSON parser
|
|
||||||
- **curl** - HTTP/HTTPS client library for NIP-05/NIP-11
|
|
||||||
- **NOSTR Community** - For protocol specification and feedback
|
|
||||||
|
|
||||||
---
|
|
||||||
|
|
||||||
**Built with ❤️ for the decentralized web**
|
|
||||||
|
|
||||||
*OpenSSL-based • Minimal dependencies • Production ready*
|
|
||||||
33
main.c
33
main.c
|
|
@ -1,33 +0,0 @@
|
||||||
/*
|
|
||||||
* C Template - Main Example File
|
|
||||||
* This is a basic template file to demonstrate the project structure
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <stdio.h>
|
|
||||||
#include <stdlib.h>
|
|
||||||
|
|
||||||
// Include version header if it exists (will be auto-generated by build.sh)
|
|
||||||
#ifdef __has_include
|
|
||||||
#if __has_include("version.h")
|
|
||||||
#include "version.h"
|
|
||||||
#define HAS_VERSION
|
|
||||||
#endif
|
|
||||||
#endif
|
|
||||||
|
|
||||||
int main(void) {
|
|
||||||
printf("C Template Project\n");
|
|
||||||
printf("==================\n\n");
|
|
||||||
|
|
||||||
#ifdef HAS_VERSION
|
|
||||||
printf("Version: %s\n", get_version());
|
|
||||||
printf("Full Version: %s\n", get_version_full());
|
|
||||||
printf("Build Info: %s\n", get_build_info());
|
|
||||||
#else
|
|
||||||
printf("Version: Not available (run ./build.sh to generate version info)\n");
|
|
||||||
#endif
|
|
||||||
|
|
||||||
printf("\nThis is a template C project with automatic versioning.\n");
|
|
||||||
printf("Use ./build.sh to build the project and generate version information.\n");
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue