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anglefox 2013-11-14
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/**
* Determine if one cert was used to sign another
* Note that more than one CA cert can give a positive result, some certs
* re-issue signing certs after having only changed the expiration dates.
* @param string $cert - PEM encoded cert
* @param string $caCert - PEM encoded cert that possibly signed $cert
* @return bool
*/
function isCertSigner($certPem=null,$caCertPem=null) {
if (!function_exists('openssl_pkey_get_public')) {
die('Need the openssl_pkey_get_public() function.');
}
if (!function_exists('openssl_public_decrypt')) {
die('Need the openssl_public_decrypt() function.');
}
if (!function_exists('hash')) {
die('Need the php hash() function.');
}
if (empty($certPem) or empty($caCertPem)) { return false; }
// Convert the cert to der for feeding to extractSignature.
$certDer = $this->pemToDer($certPem);
if (!is_string($certDer)) { die('invalid certPem'); }
// Grab the encrypted signature from the der encoded cert.
$encryptedSig = $this->extractSignature($certDer);
if (!is_string($encryptedSig)) {
die('Failed to extract encrypted signature from certPem.');
}
// Extract the public key from the ca cert, which is what has
// been used to encrypt the signature in the cert.
$pubKey = openssl_pkey_get_public($caCertPem);
if ($pubKey === false) {
die('Failed to extract the public key from the ca cert.');
}
// Attempt to decrypt the encrypted signature using the CA's public
// key, returning the decrypted signature in $decryptedSig. If
// it can't be decrypted, this ca was not used to sign it for sure...
$rc = openssl_public_decrypt($encryptedSig,$decryptedSig,$pubKey);
if ($rc === false) { return false; }
// We now have the decrypted signature, which is der encoded
// asn1 data containing the signature algorithm and signature hash.
// Now we need what was originally hashed by the issuer, which is
// the original DER encoded certificate without the issuer and
// signature information.
$origCert = $this->stripSignerAsn($certDer);
if ($origCert === false) {
die('Failed to extract unsigned cert.');
}
// Get the oid of the signature hash algorithm, which is required
// to generate our own hash of the original cert. This hash is
// what will be compared to the issuers hash.
$oid = $this->getSignatureAlgorithmOid($decryptedSig);
if ($oid === false) {
die('Failed to determine the signature algorithm.');
}
switch($oid) {
case '1.2.840.113549.2.2': $algo = 'md2'; break;
case '1.2.840.113549.2.4': $algo = 'md4'; break;
case '1.2.840.113549.2.5': $algo = 'md5'; break;
case '1.3.14.3.2.18': $algo = 'sha'; break;
case '1.3.14.3.2.26': $algo = 'sha1'; break;
case '2.16.840.1.101.3.4.2.1': $algo = 'sha256'; break;
case '2.16.840.1.101.3.4.2.2': $algo = 'sha384'; break;
case '2.16.840.1.101.3.4.2.3': $algo = 'sha512'; break;
default:
die('Unknown signature hash algorithm oid: ' . $oid);
break;
}
// Get the issuer generated hash from the decrypted signature.
$decryptedHash = $this->getSignatureHash($decryptedSig);
// Ok, hash the original unsigned cert with the same algorithm
// and if it matches $decryptedHash we have a winner.
$certHash = hash($algo,$origCert);
return ($decryptedHash === $certHash);
}
/**
* Convert pem encoded certificate to DER encoding
* @return string $derEncoded on success
* @return bool false on failures
*/
function pemToDer($pem=null) {
if (!is_string($pem)) { return false; }
$cert_split = preg_split('/(-----((BEGIN)|(END)) CERTIFICATE-----)/',$pem);
if (!isset($cert_split[1])) { return false; }
return base64_decode($cert_split[1]);
}
/**
* Obtain der cert with issuer and signature sections stripped.
* @param string $der - der encoded certificate
* @return string $der on success
* @return bool false on failures.
*/
function stripSignerAsn($der=null) {
if (!is_string($der) or strlen($der) < 8) { return false; }
$bit = 4;
$len = ord($der[($bit + 1)]);
$bytes = 0;
if ($len & 0x80) {
$bytes = $len & 0x0f;
$len = 0;
for($i = 0; $i < $bytes; $i++) {
$len = ($len << 8) | ord($der[$bit + $i + 2]);
}
}
return substr($der,4,$len + 4);
}
}
/**
* HTML form starts here...
*/
$this->answer = 'Enter PEM Encoded Certificates for the Issuer and Subject '
. 'and click Submit. Include the entire certificates, including '
. 'the BEGIN CERTIFICATE and END CERTIFICATE lines.';
/*
if (isset($_POST['subjectPem']) and isset($_POST['issuerPem'])) {
if (strlen($_POST['subjectPem']) > 0 and strlen($_POST['issuerPem']) > 0) {
$rc = isCertSigner($_POST['subjectPem'],$_POST['issuerPem']);
if ($rc === true) {
$answer = 'The issuer cert DID sign the subject cert.';
} else {
$answer = 'The issuer cert DID NOT sign the subject cert.';
}
}
}
*/
?>
anglefox 2013-11-14
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已经解决了！
在网上找了个类，可以。
<?php
/**
* Is one pem encoded certificate the signer of another?
*
* The PHP openssl functionality is severely limited by the lack of a stable
* api and documentation that might as well have been encrypted itself.
* In particular the documention on openssl_verify() never explains where
* to get the actual signature to verify. The isCertSigner() function below
* will accept two PEM encoded certs as arguments and will return true if
* one certificate was used to sign the other. It only relies on the
* openssl_pkey_get_public() and openssl_public_decrypt() openssl functions,
* which should stay fairly stable. The ASN parsing code snippets were mostly
* borrowed from the horde project's smime.php.
*
* @author Mike Green <mikey at badpenguins dot com>
* @copyright Copyright (c) 2010, Mike Green
* @license http://opensource.org/licenses/gpl-2.0.php GPLv2
*/
/**
* If viewSource is in the request string, show the source, luke.
if (isset($_REQUEST['viewSource'])) {
die(highlight_file(__FILE__));
}
*/
class OpensslVerifyAPI {
/**
* Extract signature from der encoded cert.
* Expects x509 der encoded certificate consisting of a section container
* containing 2 sections and a bitstream. The bitstream contains the
* original encrypted signature, encrypted by the public key of the issuing
* signer.
* @param string $der
* @return string on success
* @return bool false on failures
*/
function extractSignature($der=false) {
if (strlen($der) < 5) { return false; }
// skip container sequence
$der = substr($der,4);
// now burn through two sequences and the return the final bitstream
while(strlen($der) > 1) {
$class = ord($der[0]);
$classHex = dechex($class);
switch($class) {
// BITSTREAM
case 0x03:
$len = ord($der[1]);
$bytes = 0;
if ($len & 0x80) {
$bytes = $len & 0x0f;
$len = 0;
for ($i = 0; $i < $bytes; $i++) {
$len = ($len << 8) | ord($der[$i + 2]);
}
}
return substr($der,3 + $bytes, $len);
break;
// SEQUENCE
case 0x30:
$len = ord($der[1]);
$bytes = 0;
if ($len & 0x80) {
$bytes = $len & 0x0f;
$len = 0;
for($i = 0; $i < $bytes; $i++) {
$len = ($len << 8) | ord($der[$i + 2]);
}
}
$contents = substr($der, 2 + $bytes, $len);
$der = substr($der,2 + $bytes + $len);
break;
default:
return false;
break;
}
}
return false;
}
/**
* Get signature algorithm oid from der encoded signature data.
* Expects decrypted signature data from a certificate in der format.
* This ASN1 data should contain the following structure:
* SEQUENCE
* SEQUENCE
* OID (signature algorithm)
* NULL
* OCTET STRING (signature hash)
* @return bool false on failures
* @return string oid
*/
function getSignatureAlgorithmOid($der=null) {
// Validate this is the der we need...
if (!is_string($der) or strlen($der) < 5) { return false; }
$bit_seq1 = 0;
$bit_seq2 = 2;
$bit_oid = 4;
if (ord($der[$bit_seq1]) !== 0x30) {
die('Invalid DER passed to getSignatureAlgorithmOid()');
}
if (ord($der[$bit_seq2]) !== 0x30) {
die('Invalid DER passed to getSignatureAlgorithmOid()');
}
if (ord($der[$bit_oid]) !== 0x06) {
die('Invalid DER passed to getSignatureAlgorithmOid');
}
// strip out what we don't need and get the oid
$der = substr($der,$bit_oid);
// Get the oid
$len = ord($der[1]);
$bytes = 0;
if ($len & 0x80) {
$bytes = $len & 0x0f;
$len = 0;
for ($i = 0; $i < $bytes; $i++) {
$len = ($len << 8) | ord($der[$i + 2]);
}
}
$oid_data = substr($der, 2 + $bytes, $len);
// Unpack the OID
$oid = floor(ord($oid_data[0]) / 40);
$oid .= '.' . ord($oid_data[0]) % 40;
$value = 0;
$i = 1;
while ($i < strlen($oid_data)) {
$value = $value << 7;
$value = $value | (ord($oid_data[$i]) & 0x7f);
if (!(ord($oid_data[$i]) & 0x80)) {
$oid .= '.' . $value;
$value = 0;
}
$i++;
}
return $oid;
}
/**
* Get signature hash from der encoded signature data.
* Expects decrypted signature data from a certificate in der format.
* This ASN1 data should contain the following structure:
* SEQUENCE
* SEQUENCE
* OID (signature algorithm)
* NULL
* OCTET STRING (signature hash)
* @return bool false on failures
* @return string hash
*/
function getSignatureHash($der=null) {
// Validate this is the der we need...
if (!is_string($der) or strlen($der) < 5) { return false; }
if (ord($der[0]) !== 0x30) {
die('Invalid DER passed to getSignatureHash()');
}
// strip out the container sequence
$der = substr($der,2);
if (ord($der[0]) !== 0x30) {
die('Invalid DER passed to getSignatureHash()');
}
// Get the length of the first sequence so we can strip it out.
$len = ord($der[1]);
$bytes = 0;
if ($len & 0x80) {
$bytes = $len & 0x0f;
$len = 0;
for ($i = 0; $i < $bytes; $i++) {
$len = ($len << 8) | ord($der[$i + 2]);
}
}
$der = substr($der, 2 + $bytes + $len);
// Now we should have an octet string
if (ord($der[0]) !== 0x04) {
die('Invalid DER passed to getSignatureHash()');
}
$len = ord($der[1]);
$bytes = 0;
if ($len & 0x80) {
$bytes = $len & 0x0f;
$len = 0;
for ($i = 0; $i < $bytes; $i++) {
$len = ($len << 8) | ord($der[$i + 2]);
}
}
return bin2hex(substr($der, 2 + $bytes, $len));
}
jdgdf566 2013-11-07
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这个一般可以不管。
anglefox 2013-11-06
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[quote=引用 2 楼 sjqzone 的回复:]
$signature公钥加密生成的数据，$data原始数据
你是说$signature 是$pub_key_id 加密生成的？如何加密？
sjqzone 2013-11-05
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$signature公钥加密生成的数据，$data原始数据
$fp = fopen("pem公钥", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pub_key_id = openssl_get_publickey($cert);
anglefox 2013-11-05
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$pub_key_id 毫无悬疑是公钥！其他两个参数$data 和 $signature分别表示什么意思？
