511 lines
14 KiB
PHP
511 lines
14 KiB
PHP
<?php
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/**
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* @file src/Util/Crypto.php
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*/
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namespace Friendica\Util;
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use Friendica\Core\Config;
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use Friendica\Core\Hook;
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use Friendica\Core\Logger;
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use ASN_BASE;
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use ASNValue;
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/**
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* @brief Crypto class
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*/
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class Crypto
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{
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// supported algorithms are 'sha256', 'sha1'
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/**
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* @param string $data data
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* @param string $key key
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* @param string $alg algorithm
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* @return string
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*/
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public static function rsaSign($data, $key, $alg = 'sha256')
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{
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openssl_sign($data, $sig, $key, (($alg == 'sha1') ? OPENSSL_ALGO_SHA1 : $alg));
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return $sig;
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}
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/**
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* @param string $data data
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* @param string $sig signature
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* @param string $key key
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* @param string $alg algorithm
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* @return boolean
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*/
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public static function rsaVerify($data, $sig, $key, $alg = 'sha256')
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{
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return openssl_verify($data, $sig, $key, (($alg == 'sha1') ? OPENSSL_ALGO_SHA1 : $alg));
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}
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/**
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* @param string $Der der formatted string
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* @param bool $Private key type optional, default false
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* @return string
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*/
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private static function DerToPem($Der, $Private = false)
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{
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//Encode:
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$Der = base64_encode($Der);
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//Split lines:
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$lines = str_split($Der, 65);
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$body = implode("\n", $lines);
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//Get title:
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$title = $Private ? 'RSA PRIVATE KEY' : 'PUBLIC KEY';
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//Add wrapping:
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$result = "-----BEGIN {$title}-----\n";
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$result .= $body . "\n";
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$result .= "-----END {$title}-----\n";
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return $result;
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}
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/**
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* @param string $Der der formatted string
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* @return string
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*/
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private static function DerToRsa($Der)
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{
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//Encode:
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$Der = base64_encode($Der);
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//Split lines:
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$lines = str_split($Der, 64);
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$body = implode("\n", $lines);
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//Get title:
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$title = 'RSA PUBLIC KEY';
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//Add wrapping:
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$result = "-----BEGIN {$title}-----\n";
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$result .= $body . "\n";
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$result .= "-----END {$title}-----\n";
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return $result;
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}
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/**
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* @param string $Modulus modulo
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* @param string $PublicExponent exponent
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* @return string
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*/
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private static function pkcs8Encode($Modulus, $PublicExponent)
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{
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//Encode key sequence
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$modulus = new ASNValue(ASNValue::TAG_INTEGER);
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$modulus->SetIntBuffer($Modulus);
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$publicExponent = new ASNValue(ASNValue::TAG_INTEGER);
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$publicExponent->SetIntBuffer($PublicExponent);
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$keySequenceItems = [$modulus, $publicExponent];
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$keySequence = new ASNValue(ASNValue::TAG_SEQUENCE);
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$keySequence->SetSequence($keySequenceItems);
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//Encode bit string
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$bitStringValue = $keySequence->Encode();
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$bitStringValue = chr(0x00) . $bitStringValue; //Add unused bits byte
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$bitString = new ASNValue(ASNValue::TAG_BITSTRING);
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$bitString->Value = $bitStringValue;
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//Encode body
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$bodyValue = "\x30\x0d\x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x01\x01\x05\x00" . $bitString->Encode();
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$body = new ASNValue(ASNValue::TAG_SEQUENCE);
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$body->Value = $bodyValue;
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//Get DER encoded public key:
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$PublicDER = $body->Encode();
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return $PublicDER;
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}
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/**
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* @param string $Modulus modulo
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* @param string $PublicExponent exponent
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* @return string
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*/
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private static function pkcs1Encode($Modulus, $PublicExponent)
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{
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//Encode key sequence
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$modulus = new ASNValue(ASNValue::TAG_INTEGER);
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$modulus->SetIntBuffer($Modulus);
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$publicExponent = new ASNValue(ASNValue::TAG_INTEGER);
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$publicExponent->SetIntBuffer($PublicExponent);
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$keySequenceItems = [$modulus, $publicExponent];
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$keySequence = new ASNValue(ASNValue::TAG_SEQUENCE);
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$keySequence->SetSequence($keySequenceItems);
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//Encode bit string
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$bitStringValue = $keySequence->Encode();
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return $bitStringValue;
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}
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/**
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* @param string $m modulo
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* @param string $e exponent
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* @return string
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*/
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public static function meToPem($m, $e)
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{
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$der = self::pkcs8Encode($m, $e);
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$key = self::DerToPem($der, false);
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return $key;
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}
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/**
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* @param string $key key
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* @param string $m modulo reference
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* @param object $e exponent reference
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* @return void
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* @throws \Exception
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*/
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private static function pubRsaToMe($key, &$m, &$e)
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{
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$lines = explode("\n", $key);
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unset($lines[0]);
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unset($lines[count($lines)]);
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$x = base64_decode(implode('', $lines));
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$r = ASN_BASE::parseASNString($x);
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$m = Strings::base64UrlDecode($r[0]->asnData[0]->asnData);
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$e = Strings::base64UrlDecode($r[0]->asnData[1]->asnData);
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}
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/**
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* @param string $key key
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* @return string
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* @throws \Exception
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*/
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public static function rsaToPem($key)
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{
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self::pubRsaToMe($key, $m, $e);
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return self::meToPem($m, $e);
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}
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/**
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* @param string $key key
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* @return string
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* @throws \Exception
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*/
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private static function pemToRsa($key)
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{
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self::pemToMe($key, $m, $e);
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return self::meToRsa($m, $e);
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}
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/**
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* @param string $key key
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* @param string $m modulo reference
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* @param string $e exponent reference
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* @return void
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* @throws \Exception
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*/
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public static function pemToMe($key, &$m, &$e)
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{
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$lines = explode("\n", $key);
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unset($lines[0]);
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unset($lines[count($lines)]);
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$x = base64_decode(implode('', $lines));
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$r = ASN_BASE::parseASNString($x);
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$m = Strings::base64UrlDecode($r[0]->asnData[1]->asnData[0]->asnData[0]->asnData);
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$e = Strings::base64UrlDecode($r[0]->asnData[1]->asnData[0]->asnData[1]->asnData);
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}
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/**
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* @param string $m modulo
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* @param string $e exponent
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* @return string
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*/
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private static function meToRsa($m, $e)
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{
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$der = self::pkcs1Encode($m, $e);
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$key = self::DerToRsa($der);
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return $key;
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}
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/**
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* @param integer $bits number of bits
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* @return mixed
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function newKeypair($bits)
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{
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$openssl_options = [
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'digest_alg' => 'sha1',
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'private_key_bits' => $bits,
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'encrypt_key' => false
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];
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$conf = Config::get('system', 'openssl_conf_file');
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if ($conf) {
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$openssl_options['config'] = $conf;
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}
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$result = openssl_pkey_new($openssl_options);
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if (empty($result)) {
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Logger::log('new_keypair: failed');
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return false;
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}
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// Get private key
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$response = ['prvkey' => '', 'pubkey' => ''];
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openssl_pkey_export($result, $response['prvkey']);
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// Get public key
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$pkey = openssl_pkey_get_details($result);
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$response['pubkey'] = $pkey["key"];
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return $response;
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}
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/**
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* Encrypt a string with 'aes-256-cbc' cipher method.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $key The key used for encryption.
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* @param string $iv A non-NULL Initialization Vector.
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*
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* @return string|boolean Encrypted string or false on failure.
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*/
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private static function encryptAES256CBC($data, $key, $iv)
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{
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return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
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}
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/**
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* Decrypt a string with 'aes-256-cbc' cipher method.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $key The key used for decryption.
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* @param string $iv A non-NULL Initialization Vector.
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*
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* @return string|boolean Decrypted string or false on failure.
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*/
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private static function decryptAES256CBC($data, $key, $iv)
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{
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return openssl_decrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
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}
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/**
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* Encrypt a string with 'aes-256-ctr' cipher method.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $key The key used for encryption.
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* @param string $iv A non-NULL Initialization Vector.
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*
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* @return string|boolean Encrypted string or false on failure.
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*/
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private static function encryptAES256CTR($data, $key, $iv)
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{
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$key = substr($key, 0, 32);
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$iv = substr($iv, 0, 16);
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return openssl_encrypt($data, 'aes-256-ctr', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
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}
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/**
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* Decrypt a string with 'aes-256-ctr' cipher method.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $key The key used for decryption.
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* @param string $iv A non-NULL Initialization Vector.
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*
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* @return string|boolean Decrypted string or false on failure.
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*/
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private static function decryptAES256CTR($data, $key, $iv)
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{
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$key = substr($key, 0, 32);
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$iv = substr($iv, 0, 16);
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return openssl_decrypt($data, 'aes-256-ctr', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $pubkey The public key.
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* @param string $alg The algorithm used for encryption.
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*
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* @return array
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* @throws \Exception
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*/
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public static function encapsulate($data, $pubkey, $alg = 'aes256cbc')
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{
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if ($alg === 'aes256cbc') {
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return self::encapsulateAes($data, $pubkey);
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}
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return self::encapsulateOther($data, $pubkey, $alg);
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $pubkey The public key.
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* @param string $alg The algorithm used for encryption.
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*
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* @return array
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* @throws \Exception
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*/
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private static function encapsulateOther($data, $pubkey, $alg)
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{
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if (!$pubkey) {
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Logger::log('no key. data: '.$data);
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}
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$fn = 'encrypt' . strtoupper($alg);
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if (method_exists(__CLASS__, $fn)) {
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$result = ['encrypted' => true];
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$key = random_bytes(256);
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$iv = random_bytes(256);
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$result['data'] = Strings::base64UrlEncode(self::$fn($data, $key, $iv), true);
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// log the offending call so we can track it down
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if (!openssl_public_encrypt($key, $k, $pubkey)) {
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$x = debug_backtrace();
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Logger::log('RSA failed. ' . print_r($x[0], true));
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}
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$result['alg'] = $alg;
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$result['key'] = Strings::base64UrlEncode($k, true);
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openssl_public_encrypt($iv, $i, $pubkey);
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$result['iv'] = Strings::base64UrlEncode($i, true);
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return $result;
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} else {
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$x = ['data' => $data, 'pubkey' => $pubkey, 'alg' => $alg, 'result' => $data];
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Hook::callAll('other_encapsulate', $x);
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return $x['result'];
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}
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $pubkey
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*
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* @return array
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* @throws \Exception
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*/
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private static function encapsulateAes($data, $pubkey)
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{
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if (!$pubkey) {
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Logger::log('aes_encapsulate: no key. data: ' . $data);
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}
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$key = random_bytes(32);
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$iv = random_bytes(16);
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$result = ['encrypted' => true];
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$result['data'] = Strings::base64UrlEncode(self::encryptAES256CBC($data, $key, $iv), true);
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// log the offending call so we can track it down
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if (!openssl_public_encrypt($key, $k, $pubkey)) {
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$x = debug_backtrace();
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Logger::log('aes_encapsulate: RSA failed. ' . print_r($x[0], true));
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}
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$result['alg'] = 'aes256cbc';
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$result['key'] = Strings::base64UrlEncode($k, true);
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openssl_public_encrypt($iv, $i, $pubkey);
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$result['iv'] = Strings::base64UrlEncode($i, true);
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return $result;
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param array $data ['iv' => $iv, 'key' => $key, 'alg' => $alg, 'data' => $data]
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* @param string $prvkey The private key used for decryption.
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*
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* @return string|boolean The decrypted string or false on failure.
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* @throws \Exception
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*/
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public static function unencapsulate(array $data, $prvkey)
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{
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if (!$data) {
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return;
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}
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$alg = ((array_key_exists('alg', $data)) ? $data['alg'] : 'aes256cbc');
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if ($alg === 'aes256cbc') {
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return self::encapsulateAes($data['data'], $prvkey);
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}
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return self::encapsulateOther($data['data'], $prvkey, $alg);
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param array $data
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* @param string $prvkey The private key used for decryption.
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* @param string $alg
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*
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* @return string|boolean The decrypted string or false on failure.
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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private static function unencapsulateOther(array $data, $prvkey, $alg)
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{
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$fn = 'decrypt' . strtoupper($alg);
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if (method_exists(__CLASS__, $fn)) {
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openssl_private_decrypt(Strings::base64UrlDecode($data['key']), $k, $prvkey);
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openssl_private_decrypt(Strings::base64UrlDecode($data['iv']), $i, $prvkey);
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return self::$fn(Strings::base64UrlDecode($data['data']), $k, $i);
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} else {
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$x = ['data' => $data, 'prvkey' => $prvkey, 'alg' => $alg, 'result' => $data];
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Hook::callAll('other_unencapsulate', $x);
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return $x['result'];
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}
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param array $data
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* @param string $prvkey The private key used for decryption.
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*
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* @return string|boolean The decrypted string or false on failure.
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* @throws \Exception
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*/
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private static function unencapsulateAes($data, $prvkey)
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{
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openssl_private_decrypt(Strings::base64UrlDecode($data['key']), $k, $prvkey);
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openssl_private_decrypt(Strings::base64UrlDecode($data['iv']), $i, $prvkey);
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return self::decryptAES256CBC(Strings::base64UrlDecode($data['data']), $k, $i);
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}
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/**
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* Creates cryptographic secure random digits
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*
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* @param string $digits The count of digits
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* @return int The random Digits
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*
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* @throws \Exception In case 'random_int' isn't usable
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*/
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public static function randomDigits($digits)
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{
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$rn = '';
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// generating cryptographically secure pseudo-random integers
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for ($i = 0; $i < $digits; $i++) {
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$rn .= random_int(0, 9);
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}
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return $rn;
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}
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}
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