UltrafastSecp256k1/bindings/php

Ufsecp -- PHP

PHP FFI binding for UltrafastSecp256k1 -- high-performance secp256k1 elliptic curve cryptography.

This is the reference binding with 100% API coverage.

Features

• ECDSA -- sign, verify, recover, DER serialization (RFC 6979)
• Schnorr -- BIP-340 sign/verify
• ECDH -- compressed, x-only, raw shared secret
• BIP-32 -- HD key derivation (master/derive/path/privkey/pubkey)
• Taproot -- output key tweaking, verification (BIP-341)
• Addresses -- P2PKH, P2WPKH, P2TR
• WIF -- encode/decode
• Hashing -- SHA-256 (hardware-accelerated), HASH160, tagged hash
• Key tweaking -- negate, add, multiply
• Context -- create, destroy, clone, last_error, ctx_size
• Ethereum -- Keccak-256, EIP-55 addresses, EIP-155 sign, ecrecover
• BIP-39 -- mnemonic generation, validation, seed derivation
• Multi-coin wallet -- 7-coin address dispatch (BTC/LTC/DOGE/DASH/ETH/BCH/TRX)
• Batch verification -- ECDSA + Schnorr batch verify with invalid identification
• MuSig2 -- BIP-327 multi-signatures (key agg, nonce gen, partial sign, aggregate)
• FROST -- threshold signatures (keygen, sign, aggregate, verify)
• Adaptor signatures -- Schnorr + ECDSA adaptor pre-sign, adapt, extract
• Pedersen commitments -- commit, verify, sum balance, switch commitments
• ZK proofs -- knowledge proof, DLEQ proof, Bulletproof range proof
• Multi-scalar multiplication -- Shamir's trick, MSM
• Pubkey arithmetic -- add, negate, combine N keys
• SHA-512 -- full SHA-512 hash
• Message signing -- BIP-137 Bitcoin message sign/verify

Requirements

• PHP 7.4+ with FFI extension enabled
• libufsecp.so / ufsecp.dll / libufsecp.dylib

Quick Start

use Ultrafast\Ufsecp;

$ctx = new Ufsecp();

$privkey = str_repeat("\x00", 31) . "\x01";
$pubkey = $ctx->pubkeyCreate($privkey);
$msgHash = Ufsecp::sha256("hello");
$sig = $ctx->ecdsaSign($msgHash, $privkey);
$valid = $ctx->ecdsaVerify($msgHash, $sig, $pubkey);

$ctx->destroy();

ECDSA Recovery

[$sig, $recid] = $ctx->ecdsaSignRecoverable($msgHash, $privkey);
$recovered = $ctx->ecdsaRecover($msgHash, $sig, $recid);

Taproot (BIP-341)

[$outputKey, $parity] = $ctx->taprootOutputKey($xonlyPub);
$tweaked = $ctx->taprootTweakSeckey($privkey);
$valid = $ctx->taprootVerify($outputKey, $parity, $xonlyPub);

Architecture Note

The C ABI layer uses the fast (variable-time) implementation for maximum throughput. A constant-time (CT) layer with identical mathematical operations is available via the C++ headers for applications requiring timing-attack resistance.

Performance Tuning

When building the native library from source, you can tune scalar multiplication (k*P) performance via the GLV window width:

cmake -S . -B build -DSECP256K1_GLV_WINDOW_WIDTH=6

Window	Default On	Tradeoff
w=4	ESP32, WASM	Smaller tables, more point additions
w=5	x86-64, ARM64, RISC-V	Balanced (default)
w=6	--	Larger tables, fewer additions

See docs/PERFORMANCE_GUIDE.md for detailed benchmarks and per-platform tuning advice.

Smoke Validation

bash libs/UltrafastSecp256k1/scripts/validate_bindings.sh

License

MIT