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<?php
require_once('library/ASNValue.class.php');
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, 65);
$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;
}
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