From c26dede97f626b52b7bf8962ed55d1dbda86abe8 Mon Sep 17 00:00:00 2001
From: Hilmar R <u02@u29lx193>
Date: Sun, 28 Feb 2021 21:06:16 +0100
Subject: get dev

---
 Zotlabs/Lib/Crypto.php | 206 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 206 insertions(+)
 create mode 100644 Zotlabs/Lib/Crypto.php

(limited to 'Zotlabs/Lib/Crypto.php')

diff --git a/Zotlabs/Lib/Crypto.php b/Zotlabs/Lib/Crypto.php
new file mode 100644
index 000000000..f1794ae64
--- /dev/null
+++ b/Zotlabs/Lib/Crypto.php
@@ -0,0 +1,206 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+use Exception;
+
+class Crypto {
+
+	public static $openssl_algorithms = [
+
+		// zot6 nickname,   opensslname,   keylength, ivlength
+
+		['aes256ctr', 'aes-256-ctr', 32, 16],
+		['camellia256cfb', 'camellia-256-cfb', 32, 16],
+		['cast5cfb', 'cast5-cfb', 16, 8],
+		['aes256cbc', 'aes-256-cbc', 32, 16] // remove after legacy zot has been sunset
+
+	];
+
+	public static function methods() {
+		$ret = [];
+
+		foreach (self::$openssl_algorithms as $ossl) {
+			$ret[] = $ossl[0] . '.oaep';
+		}
+
+		call_hooks('crypto_methods', $ret);
+		return $ret;
+	}
+
+	public static function signing_methods() {
+
+		$ret = ['sha256'];
+		call_hooks('signing_methods', $ret);
+		return $ret;
+
+	}
+
+	public static function new_keypair($bits) {
+
+		$openssl_options = [
+			'digest_alg'       => 'sha1',
+			'private_key_bits' => $bits,
+			'encrypt_key'      => false
+		];
+
+		$conf = get_config('system', 'openssl_conf_file');
+
+		if ($conf) {
+			$openssl_options['config'] = $conf;
+		}
+
+		$result = openssl_pkey_new($openssl_options);
+
+		if (empty($result)) {
+			return false;
+		}
+
+		// Get private key
+
+		$response = ['prvkey' => '', 'pubkey' => ''];
+
+		openssl_pkey_export($result, $response['prvkey']);
+
+		// Get public key
+		$pkey               = openssl_pkey_get_details($result);
+		$response['pubkey'] = $pkey["key"];
+
+		return $response;
+
+	}
+
+	public static function sign($data, $key, $alg = 'sha256') {
+
+		if (!$key) {
+			return false;
+		}
+
+		$sig = '';
+		openssl_sign($data, $sig, $key, $alg);
+		return $sig;
+	}
+
+	public static function verify($data, $sig, $key, $alg = 'sha256') {
+
+		if (!$key) {
+			return false;
+		}
+
+		try {
+			$verify = openssl_verify($data, $sig, $key, $alg);
+		} catch (Exception $e) {
+			$verify = (-1);
+		}
+
+		if ($verify === (-1)) {
+			while ($msg = openssl_error_string()) {
+				logger('openssl_verify: ' . $msg, LOGGER_NORMAL, LOG_ERR);
+			}
+			btlogger('openssl_verify: key: ' . $key, LOGGER_DEBUG, LOG_ERR);
+		}
+
+		return (($verify > 0) ? true : false);
+	}
+
+	public static function encapsulate($data, $pubkey, $alg) {
+
+		if (!($alg && $pubkey)) {
+			return $data;
+		}
+
+		$alg_base = $alg;
+		$padding  = OPENSSL_PKCS1_PADDING;
+
+		$exts = explode('.', $alg);
+		if (count($exts) > 1) {
+			switch ($exts[1]) {
+				case 'oaep':
+					$padding = OPENSSL_PKCS1_OAEP_PADDING;
+					break;
+				default:
+					break;
+			}
+			$alg_base = $exts[0];
+		}
+
+		$method = null;
+
+		foreach (self::$openssl_algorithms as $ossl) {
+			if ($ossl[0] === $alg_base) {
+				$method = $ossl;
+				break;
+			}
+		}
+
+		if ($method) {
+			$result = ['encrypted' => true];
+
+			$key = openssl_random_pseudo_bytes(256);
+			$iv  = openssl_random_pseudo_bytes(256);
+
+			$key1 = substr($key, 0, $method[2]);
+			$iv1  = substr($iv, 0, $method[3]);
+
+			$result['data'] = base64url_encode(openssl_encrypt($data, $method[1], $key1, OPENSSL_RAW_DATA, $iv1), true);
+
+			openssl_public_encrypt($key, $k, $pubkey, $padding);
+			openssl_public_encrypt($iv, $i, $pubkey, $padding);
+
+			$result['alg'] = $alg;
+			$result['key'] = base64url_encode($k, true);
+			$result['iv']  = base64url_encode($i, true);
+			return $result;
+
+		}
+		else {
+			$x = ['data' => $data, 'pubkey' => $pubkey, 'alg' => $alg, 'result' => $data];
+			call_hooks('crypto_encapsulate', $x);
+			return $x['result'];
+		}
+	}
+
+	public static function unencapsulate($data, $prvkey) {
+
+		if (!(is_array($data) && array_key_exists('encrypted', $data) && array_key_exists('alg', $data) && $data['alg'])) {
+			logger('not encrypted');
+
+			return $data;
+		}
+
+		$alg_base = $data['alg'];
+		$padding  = OPENSSL_PKCS1_PADDING;
+
+		$exts = explode('.', $data['alg']);
+		if (count($exts) > 1) {
+			switch ($exts[1]) {
+				case 'oaep':
+					$padding = OPENSSL_PKCS1_OAEP_PADDING;
+					break;
+				default:
+					break;
+			}
+			$alg_base = $exts[0];
+		}
+
+		$method = null;
+
+		foreach (self::$openssl_algorithms as $ossl) {
+			if ($ossl[0] === $alg_base) {
+				$method = $ossl;
+				break;
+			}
+		}
+
+		if ($method) {
+			openssl_private_decrypt(base64url_decode($data['key']), $k, $prvkey, $padding);
+			openssl_private_decrypt(base64url_decode($data['iv']), $i, $prvkey, $padding);
+			return openssl_decrypt(base64url_decode($data['data']), $method[1], substr($k, 0, $method[2]), OPENSSL_RAW_DATA, substr($i, 0, $method[3]));
+		}
+		else {
+			$x = ['data' => $data, 'prvkey' => $prvkey, 'alg' => $data['alg'], 'result' => $data];
+			call_hooks('crypto_unencapsulate', $x);
+			return $x['result'];
+		}
+	}
+}
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