Epicrypt

Epicrypt is a capability-first PHP security toolkit.

It provides focused security building blocks for:

• Certificate / PKI / key exchange
• Crypto primitives
• Token security (JWT, payload, opaque)
• Password and secret protection
• Integrity verification
• Secure generation
• Data protection workflows
• Security utilities (signed URL, CSRF, reset/action tokens)

Installation

composer require infocyph/epicrypt

Requirements

• PHP >=8.4
• ext-sodium, ext-openssl, ext-json, ext-hash

Usage Examples

Encrypt and decrypt a string

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\DataProtection\ProtectionOptions;
use Infocyph\Epicrypt\DataProtection\StringProtector;
use Infocyph\Epicrypt\Generate\KeyMaterial\KeyMaterialGenerator;

$key = (new KeyMaterialGenerator())->forAead();
$options = new ProtectionOptions('application-secret');
$protector = StringProtector::create();

$ciphertext = $protector->protect('secret-value', $key, $options);
$plaintext = $protector->unprotect($ciphertext, $key, $options);

Encrypt and decrypt a file

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\DataProtection\FileProtector;
use Infocyph\Epicrypt\DataProtection\ProtectionOptions;
use Infocyph\Epicrypt\Generate\KeyMaterial\KeyMaterialGenerator;

$key = (new KeyMaterialGenerator())->forSecretStream();
$options = new ProtectionOptions('file-backup');
$files = new FileProtector();

$files->protect('/data/plain.txt', '/data/plain.txt.ep2', $key, $options);
$files->unprotect('/data/plain.txt.ep2', '/data/plain.out.txt', $key, $options);

Rotate keys with a key ring

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\DataProtection\ProtectionOptions;
use Infocyph\Epicrypt\DataProtection\StringProtector;
use Infocyph\Epicrypt\Security\KeyPurpose;
use Infocyph\Epicrypt\Security\KeyRing;
use Infocyph\Epicrypt\Security\KeyRingEntry;
use Infocyph\Epicrypt\Security\KeyStatus;

$ring = new KeyRing([
    new KeyRingEntry('2026-01', $oldKey, KeyStatus::FALLBACK, KeyPurpose::DATA_PROTECTION, 'xchacha20-poly1305-ietf'),
    new KeyRingEntry('2026-05', $newKey, KeyStatus::ACTIVE, KeyPurpose::DATA_PROTECTION, 'xchacha20-poly1305-ietf'),
]);

$options = new ProtectionOptions('rotating-data');
$protector = StringProtector::create();
$ciphertext = $protector->protectWithKeyRing('rotating-data', $ring, $options);
$result = $protector->unprotectWithKeyRing($ciphertext, $ring, $options);

Hash, verify and rehash password

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\Password\PasswordHasher;

$hasher = new PasswordHasher();
$hash = $hasher->hashPassword('MyStrongPassword!2026');

$isValid = $hasher->verifyPassword('MyStrongPassword!2026', $hash);
$rehash = $hasher->verifyAndRehash('MyStrongPassword!2026', $hash);

Issue and verify CSRF token

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\Security\CsrfTokenManager;
use Infocyph\Epicrypt\Generate\KeyMaterial\KeyMaterialGenerator;

$csrfSecret = new KeyMaterialGenerator()->forMasterSecret(asBase64Url: false);
$csrf = new CsrfTokenManager($csrfSecret);
$token = $csrf->issueToken('session-1');

$ok = $csrf->verifyToken('session-1', $token);

Generate and verify signed URL

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\Security\SignedUrl;
use Infocyph\Epicrypt\Generate\KeyMaterial\KeyMaterialGenerator;

$urlSecret = new KeyMaterialGenerator()->forMasterSecret(asBase64Url: false);
$signed = new SignedUrl($urlSecret);
$url = $signed->generate('https://example.com/download', ['file' => 'report.pdf'], time() + 300);

$ok = $signed->verify($url);

Issue and verify JWT (HS512)

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\Token\Jwt\JwtClaims;
use Infocyph\Epicrypt\Token\Jwt\JwtPolicy;
use Infocyph\Epicrypt\Token\Jwt\SymmetricJwt;

$key = SymmetricJwt::generateBinaryKey();
$claims = JwtClaims::issue(
    'issuer-service',
    'user-1',
    ['api'],
    600,
    ['client_id' => 'web-client', 'scope' => 'profile:read'],
);
$token = SymmetricJwt::issuer($key, 'at+jwt')->issue($claims);
$verifier = SymmetricJwt::verifier($key, JwtPolicy::oauthAccessToken('issuer-service', 'api'));
$ok = $verifier->verify($token);

Issue and rotate an OAuth refresh token

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\Token\Opaque\RefreshTokenGrant;
use Infocyph\Epicrypt\Token\Opaque\RefreshTokenManager;

// Implement RefreshTokenStoreInterface with one durable database transaction.
$refreshTokens = new RefreshTokenManager($refreshTokenStore);
$refreshToken = $refreshTokens->issue(new RefreshTokenGrant(
    id: 'authorization-grant-42',
    subject: 'user-1',
    clientId: 'web-client',
    audiences: ['api'],
    scopes: ['profile:read', 'orders:read'],
    expiresAt: time() + 90 * 24 * 60 * 60,
));

$rotation = $refreshTokens->rotate(
    $presentedRefreshToken,
    'web-client',
    requestedScopes: ['profile:read'],
);
if (!$rotation->rotated) {
    throw new RuntimeException('Map every failure status to invalid_grant.');
}

$replacementRefreshToken = $rotation->token;

The complete OAuth lifecycle connects initial issuance, API verification, DPoP, rotation and revocation. The token storage guide defines the required schema and atomic transaction. Raw refresh tokens must never be stored.

Generate certificate with SAN

<?php

declare(strict_types=1);

use Infocyph\Epicrypt\Certificate\CertificateOptions;
use Infocyph\Epicrypt\Certificate\Enum\OpenSslRsaBits;
use Infocyph\Epicrypt\Certificate\KeyPairGenerator;
use Infocyph\Epicrypt\Certificate\OpenSSL\CertificateBuilder;

$pair = KeyPairGenerator::rsa(OpenSslRsaBits::BITS_3072)->generate();
$dn = ['commonName' => 'service.example.test'];

$options = new CertificateOptions(
    sanDns: ['service.example.test', 'api.example.test'],
);

$certPem = (new CertificateBuilder())->selfSign($dn, $pair['private'], options: $options);

Security

Do not disclose suspected vulnerabilities in a public issue, discussion or pull request. Review the security policy, then use GitHub private vulnerability reporting to contact the maintainers confidentially.

Epicrypt is protected by PHPForge, an automated quality and security gate covering tests, static and taint analysis, dependency auditing, architecture checks, and release readiness. Automated controls reduce risk but do not replace responsible disclosure or manual review.

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