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friendica/include/crypto.php

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<?php
require_once('library/ASNValue.class.php');
require_once('library/asn1.php');
// supported algorithms are 'sha256', 'sha1'
function rsa_sign($data,$key,$alg = 'sha256') {
$sig = '';
if (version_compare(PHP_VERSION, '5.3.0', '>=') || $alg === 'sha1') {
openssl_sign($data,$sig,$key,(($alg == 'sha1') ? OPENSSL_ALGO_SHA1 : $alg));
}
else {
if(strlen($key) < 1024 || extension_loaded('gmp')) {
require_once('library/phpsec/Crypt/RSA.php');
$rsa = new CRYPT_RSA();
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
$rsa->setHash($alg);
$rsa->loadKey($key);
$sig = $rsa->sign($data);
}
else {
logger('rsa_sign: insecure algorithm used. Please upgrade PHP to 5.3');
openssl_private_encrypt(hex2bin('3031300d060960864801650304020105000420') . hash('sha256',$data,true), $sig, $key);
}
}
return $sig;
}
function rsa_verify($data,$sig,$key,$alg = 'sha256') {
if (version_compare(PHP_VERSION, '5.3.0', '>=') || $alg === 'sha1') {
$verify = openssl_verify($data,$sig,$key,(($alg == 'sha1') ? OPENSSL_ALGO_SHA1 : $alg));
}
else {
if(strlen($key) <= 300 || extension_loaded('gmp')) {
require_once('library/phpsec/Crypt/RSA.php');
$rsa = new CRYPT_RSA();
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
$rsa->setHash($alg);
$rsa->loadKey($key);
$verify = $rsa->verify($data,$sig);
}
else {
// fallback sha256 verify for PHP < 5.3 and large key lengths
$rawsig = '';
openssl_public_decrypt($sig,$rawsig,$key);
$verify = (($rawsig && substr($rawsig,-32) === hash('sha256',$data,true)) ? true : false);
}
}
return $verify;
}
function DerToPem($Der, $Private=false)
{
//Encode:
$Der = base64_encode($Der);
//Split lines:
$lines = str_split($Der, 65);
$body = implode("\n", $lines);
//Get title:
$title = $Private? 'RSA PRIVATE KEY' : 'PUBLIC KEY';
//Add wrapping:
$result = "-----BEGIN {$title}-----\n";
$result .= $body . "\n";
$result .= "-----END {$title}-----\n";
return $result;
}
function DerToRsa($Der)
{
//Encode:
$Der = base64_encode($Der);
//Split lines:
$lines = str_split($Der, 64);
$body = implode("\n", $lines);
//Get title:
$title = 'RSA PUBLIC KEY';
//Add wrapping:
$result = "-----BEGIN {$title}-----\n";
$result .= $body . "\n";
$result .= "-----END {$title}-----\n";
return $result;
}
function pkcs8_encode($Modulus,$PublicExponent) {
//Encode key sequence
$modulus = new ASNValue(ASNValue::TAG_INTEGER);
$modulus->SetIntBuffer($Modulus);
$publicExponent = new ASNValue(ASNValue::TAG_INTEGER);
$publicExponent->SetIntBuffer($PublicExponent);
$keySequenceItems = array($modulus, $publicExponent);
$keySequence = new ASNValue(ASNValue::TAG_SEQUENCE);
$keySequence->SetSequence($keySequenceItems);
//Encode bit string
$bitStringValue = $keySequence->Encode();
$bitStringValue = chr(0x00) . $bitStringValue; //Add unused bits byte
$bitString = new ASNValue(ASNValue::TAG_BITSTRING);
$bitString->Value = $bitStringValue;
//Encode body
$bodyValue = "\x30\x0d\x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x01\x01\x05\x00" . $bitString->Encode();
$body = new ASNValue(ASNValue::TAG_SEQUENCE);
$body->Value = $bodyValue;
//Get DER encoded public key:
$PublicDER = $body->Encode();
return $PublicDER;
}
function pkcs1_encode($Modulus,$PublicExponent) {
//Encode key sequence
$modulus = new ASNValue(ASNValue::TAG_INTEGER);
$modulus->SetIntBuffer($Modulus);
$publicExponent = new ASNValue(ASNValue::TAG_INTEGER);
$publicExponent->SetIntBuffer($PublicExponent);
$keySequenceItems = array($modulus, $publicExponent);
$keySequence = new ASNValue(ASNValue::TAG_SEQUENCE);
$keySequence->SetSequence($keySequenceItems);
//Encode bit string
$bitStringValue = $keySequence->Encode();
return $bitStringValue;
}
function metopem($m,$e) {
$der = pkcs8_encode($m,$e);
$key = DerToPem($der,false);
return $key;
}
function pubrsatome($key,&$m,&$e) {
require_once('library/asn1.php');
require_once('include/salmon.php');
$lines = explode("\n",$key);
unset($lines[0]);
unset($lines[count($lines)]);
$x = base64_decode(implode('',$lines));
$r = ASN_BASE::parseASNString($x);
$m = base64url_decode($r[0]->asnData[0]->asnData);
$e = base64url_decode($r[0]->asnData[1]->asnData);
}
function rsatopem($key) {
pubrsatome($key,$m,$e);
return(metopem($m,$e));
}
function pemtorsa($key) {
pemtome($key,$m,$e);
return(metorsa($m,$e));
}
function pemtome($key,&$m,&$e) {
require_once('include/salmon.php');
$lines = explode("\n",$key);
unset($lines[0]);
unset($lines[count($lines)]);
$x = base64_decode(implode('',$lines));
$r = ASN_BASE::parseASNString($x);
$m = base64url_decode($r[0]->asnData[1]->asnData[0]->asnData[0]->asnData);
$e = base64url_decode($r[0]->asnData[1]->asnData[0]->asnData[1]->asnData);
}
function metorsa($m,$e) {
$der = pkcs1_encode($m,$e);
$key = DerToRsa($der);
return $key;
}
function salmon_key($pubkey) {
pemtome($pubkey,$m,$e);
return 'RSA' . '.' . base64url_encode($m,true) . '.' . base64url_encode($e,true) ;
}
if(! function_exists('aes_decrypt')) {
function aes_decrypt($val,$ky)
{
$key="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
for($a=0;$a<strlen($ky);$a++)
$key[$a%16]=chr(ord($key[$a%16]) ^ ord($ky[$a]));
$mode = MCRYPT_MODE_ECB;
$enc = MCRYPT_RIJNDAEL_128;
$dec = @mcrypt_decrypt($enc, $key, $val, $mode, @mcrypt_create_iv( @mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM ) );
return rtrim($dec,(( ord(substr($dec,strlen($dec)-1,1))>=0 and ord(substr($dec, strlen($dec)-1,1))<=16)? chr(ord( substr($dec,strlen($dec)-1,1))):null));
}}
if(! function_exists('aes_encrypt')) {
function aes_encrypt($val,$ky)
{
$key="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
for($a=0;$a<strlen($ky);$a++)
$key[$a%16]=chr(ord($key[$a%16]) ^ ord($ky[$a]));
$mode=MCRYPT_MODE_ECB;
$enc=MCRYPT_RIJNDAEL_128;
$val=str_pad($val, (16*(floor(strlen($val) / 16)+(strlen($val) % 16==0?2:1))), chr(16-(strlen($val) % 16)));
return mcrypt_encrypt($enc, $key, $val, $mode, mcrypt_create_iv( mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM));
}}
function pkcs5_pad ($text, $blocksize)
{
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}
function pkcs5_unpad($text)
{
$pad = ord($text{strlen($text)-1});
if ($pad > strlen($text)) return false;
if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
return substr($text, 0, -1 * $pad);
}
function AES256CBC_encrypt($data,$key,$iv) {
return mcrypt_encrypt(
MCRYPT_RIJNDAEL_128,
str_pad($key,32,"\0"),
pkcs5_pad($data,16),
MCRYPT_MODE_CBC,
str_pad($iv,16,"\0"));
}
function AES256CBC_decrypt($data,$key,$iv) {
return pkcs5_unpad(mcrypt_decrypt(
MCRYPT_RIJNDAEL_128,
str_pad($key,32,"\0"),
$data,
MCRYPT_MODE_CBC,
str_pad($iv,16,"\0")));
}
function aes_encapsulate($data,$pubkey) {
$key = random_string(32,RANDOM_STRING_TEXT);
$iv = random_string(16,RANDOM_STRING_TEXT);
$result['data'] = base64url_encode(AES256CBC_encrypt($data,$key,$iv),true);
openssl_public_encrypt($key,$k,$pubkey);
$result['key'] = base64url_encode($k,true);
openssl_public_encrypt($iv,$i,$pubkey);
$result['iv'] = base64url_encode($i,true);
return $result;
}
function aes_unencapsulate($data,$prvkey) {
openssl_private_decrypt(base64url_decode($data['key']),$k,$prvkey);
openssl_private_decrypt(base64url_decode($data['iv']),$i,$prvkey);
return AES256CBC_decrypt(base64url_decode($data['data']),$k,$i);
}
// This has been superceded.
function zot_encapsulate($data,$envelope,$pubkey) {
$res = aes_encapsulate($data,$pubkey);
return <<< EOT
<?xml version='1.0' encoding='UTF-8'?>
<zot:msg xmlns:zot='http://purl.org/zot/1.0'>
<zot:key>{$res['key']}</zot:key>
<zot:iv>{$res['iv']}</zot:iv>
<zot:env>$s1</zot:env>
<zot:sig key_id="$keyid">$sig</zot:sig>
<zot:alg>AES-256-CBC</zot:alg>
<zot:data type='application/magic-envelope+xml'>{$res['data']}</zot:data>
</zot:msg>
EOT;
}
// so has this
function zot_unencapsulate($data,$prvkey) {
$ret = array();
$c = array();
$x = parse_xml_string($data);
$c = array('key' => $x->key,'iv' => $x->iv,'data' => $x->data);
openssl_private_decrypt(base64url_decode($x->sender),$s,$prvkey);
$ret['sender'] = $s;
$ret['data'] = aes_unencapsulate($x,$prvkey);
return $ret;
}
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