mirror of https://github.com/friendica/friendica
53 lines
1.4 KiB
PHP
53 lines
1.4 KiB
PHP
<?php
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require_once('library/ASNValue.class.php');
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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 $result;
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}
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function pkcs8_encode($Modulus,$PublicExponent) {
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//Encode key sequence
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$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->SetInt($PublicExponent);
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$keySequenceItems = array($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 $PublicDER;
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}
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function metopem($m,$e) {
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$der = pkcs8_emcode($m,$e);
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$key = DerToPem($der,true);
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return $key;
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}
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