Crypto — AT Protocol Cryptography

// Generate a new key pair
$keypair = P256::create();
$keypair = K256::create();

// Load from a URL-safe Base64-encoded private key
$keypair = P256::load($base64PrivateKey);

// Export in PEM format
$privatePem = $keypair->privatePEM();
$publicPem  = $keypair->publicPEM();

// Convert to JWK (JSON Web Key)
$jwk = $keypair->toJWK();

use Revolution\Bluesky\Crypto\P256;

$keypair = P256::create();

php artisan bluesky:new-private-key

use Revolution\Bluesky\Crypto\K256;

$keypair = K256::create();

use Revolution\Bluesky\Crypto\DidKey;
use Revolution\Bluesky\Crypto\K256;

$keypair   = K256::create();
$publicPem = $keypair->publicPEM();

// Convert to did:key format
$didKey = DidKey::format($publicPem);
// => "did:key:zQ3s..."

use Revolution\Bluesky\Crypto\DidKey;
use Revolution\Bluesky\Facades\Bluesky;
use Revolution\Bluesky\Support\DidDocument;

$didDoc = DidDocument::make(
    Bluesky::identity()->resolveDID('did:plc:***')->json()
);

// Parse the multibase public key from the DID Document into a phpseclib3 public key object
$publicKey = DidKey::parse($didDoc->publicKey());

use Revolution\Bluesky\Crypto\JsonWebToken;

// Create a signed JWT (private key in PEM format)
$token = JsonWebToken::encode(
    payload: ['iss' => 'did:plc:***', 'aud' => 'https://bsky.social', 'exp' => time() + 60],
    key: $privatePem,
    alg: 'ES256',
);

// Decode a JWT (no signature verification)
$payload = JsonWebToken::decode($token);

// Generate a DPoP proof for an OAuth token request
$proof = DPoP::authProof(
    jwk: $jsonWebKey,
    url: 'https://bsky.social/oauth/token',
    method: 'POST',
    nonce: $nonce,
);

// Generate a DPoP proof for an API request (includes ath)
$proof = DPoP::apiProof(
    jwk: $jsonWebKey,
    url: 'https://api.bsky.app/xrpc/...',
    method: 'GET',
    token: $accessToken,
    nonce: $nonce,
);

use Revolution\Bluesky\Crypto\Signature;

// ASN.1 DER → compact (64 bytes)
$compact = Signature::toCompact($derSignature);

// Compact → ASN.1 DER
$der = Signature::fromCompact($compactSignature);

use Revolution\Bluesky\Crypto\JsonWebKey;

// Create a JWK from a key pair
$jwk = $keypair->toJWK();

// Or instantiate directly from an array
$jwk = JsonWebKey::load(['kty' => 'EC', 'crv' => 'P-256', ...]);

use Revolution\Bluesky\Crypto\OAuthKey;

// Load the private key from config
$oauthKey = OAuthKey::load();

// Used internally to sign Client Assertion JWTs
$jwk = $oauthKey->toJWK();