diff options
Diffstat (limited to 'include/crypto.php')
| -rw-r--r-- | include/crypto.php | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/include/crypto.php b/include/crypto.php new file mode 100644 index 000000000..1ab9e7b25 --- /dev/null +++ b/include/crypto.php @@ -0,0 +1,184 @@ +<?php + +require_once('library/ASNValue.class.php'); +require_once('library/asn1.php'); + + +function rsa_sign($data,$key) { + + $sig = ''; + if (version_compare(PHP_VERSION, '5.3.0', '>=')) { + openssl_sign($data,$sig,$key,'sha256'); + } + 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('sha256'); + $rsa->loadKey($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) { + + if (version_compare(PHP_VERSION, '5.3.0', '>=')) { + $verify = openssl_verify($data,$sig,$key,'sha256'); + } + 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('sha256'); + $rsa->loadKey($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, 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 $key; +} + +function salmon_key($pubkey) { + pemtome($pubkey,$m,$e); + return 'RSA' . '.' . base64url_encode($m,true) . '.' . base64url_encode($e,true) ; +} |