473 lines
13 KiB
PHP
473 lines
13 KiB
PHP
<?php /** @file */
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require_once('library/ASNValue.class.php');
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require_once('library/asn1.php');
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function rsa_sign($data,$key,$alg = 'sha256') {
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if(! $key)
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return 'no key';
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$sig = '';
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if(intval(OPENSSL_ALGO_SHA256) && $alg === 'sha256')
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$alg = OPENSSL_ALGO_SHA256;
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openssl_sign($data,$sig,$key,$alg);
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return $sig;
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}
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function rsa_verify($data,$sig,$key,$alg = 'sha256') {
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if(! $key)
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return false;
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if(intval(OPENSSL_ALGO_SHA256) && $alg === 'sha256')
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$alg = OPENSSL_ALGO_SHA256;
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$verify = @openssl_verify($data,$sig,$key,$alg);
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if($verify === (-1)) {
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while($msg = openssl_error_string())
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logger('openssl_verify: ' . $msg,LOGGER_NORMAL,LOG_ERR);
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btlogger('openssl_verify: key: ' . $key, LOGGER_DEBUG, LOG_ERR);
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}
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return (($verify > 0) ? true : false);
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}
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function AES256CBC_encrypt($data,$key,$iv) {
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return openssl_encrypt($data,'aes-256-cbc',str_pad($key,32,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function AES256CBC_decrypt($data,$key,$iv) {
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return openssl_decrypt($data,'aes-256-cbc',str_pad($key,32,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function AES128CBC_encrypt($data,$key,$iv) {
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$key = substr($key,0,16);
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$iv = substr($iv,0,16);
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return openssl_encrypt($data,'aes-128-cbc',str_pad($key,16,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function AES128CBC_decrypt($data,$key,$iv) {
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$key = substr($key,0,16);
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$iv = substr($iv,0,16);
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return openssl_decrypt($data,'aes-128-cbc',str_pad($key,16,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function AES256CTR_encrypt($data,$key,$iv) {
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$key = substr($key,0,32);
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$iv = substr($iv,0,16);
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return openssl_encrypt($data,'aes-256-ctr',str_pad($key,32,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function AES256CTR_decrypt($data,$key,$iv) {
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$key = substr($key,0,32);
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$iv = substr($iv,0,16);
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return openssl_decrypt($data,'aes-256-ctr',str_pad($key,32,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function CAMELLIA256CFB_encrypt($data,$key,$iv) {
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$key = substr($key,0,32);
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$iv = substr($iv,0,16);
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return openssl_encrypt($data,'camellia-256-cfb',str_pad($key,32,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function CAMELLIA256CFB_decrypt($data,$key,$iv) {
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$key = substr($key,0,32);
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$iv = substr($iv,0,16);
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return openssl_decrypt($data,'camellia-256-cfb',str_pad($key,32,"\0"),OPENSSL_RAW_DATA,str_pad($iv,16,"\0"));
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}
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function CAST5CBC_encrypt($data,$key,$iv) {
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$key = substr($key,0,16);
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$iv = substr($iv,0,8);
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return openssl_encrypt($data,'cast5-cbc',str_pad($key,16,"\0"),OPENSSL_RAW_DATA,str_pad($iv,8,"\0"));
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}
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function CAST5CBC_decrypt($data,$key,$iv) {
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$key = substr($key,0,16);
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$iv = substr($iv,0,8);
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return openssl_decrypt($data,'cast5-cbc',str_pad($key,16,"\0"),OPENSSL_RAW_DATA,str_pad($iv,8,"\0"));
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}
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function CAST5CFB_encrypt($data,$key,$iv) {
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$key = substr($key,0,16);
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$iv = substr($iv,0,8);
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return openssl_encrypt($data,'cast5-cfb',str_pad($key,16,"\0"),OPENSSL_RAW_DATA,str_pad($iv,8,"\0"));
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}
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function CAST5CFB_decrypt($data,$key,$iv) {
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$key = substr($key,0,16);
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$iv = substr($iv,0,8);
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return openssl_decrypt($data,'cast5-cfb',str_pad($key,16,"\0"),OPENSSL_RAW_DATA,str_pad($iv,8,"\0"));
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}
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function crypto_encapsulate($data,$pubkey,$alg='aes256cbc') {
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$fn = strtoupper($alg) . '_encrypt';
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if($alg === 'aes256cbc')
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return aes_encapsulate($data,$pubkey);
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return other_encapsulate($data,$pubkey,$alg);
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}
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function other_encapsulate($data,$pubkey,$alg) {
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if(! $pubkey)
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logger('no key. data: ' . $data);
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// This default will change in the future. For now make it backward compatible.
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$padding = OPENSSL_PKCS1_PADDING;
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$base = $alg;
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$exts = explode('.',$alg);
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if(count($exts) > 1) {
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switch($exts[1]) {
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case 'oaep':
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$padding = OPENSSL_PKCS1_OAEP_PADDING;
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break;
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}
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$base = $exts[0];
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}
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$fn = strtoupper($base) . '_encrypt';
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if(function_exists($fn)) {
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// A bit hesitant to use openssl_random_pseudo_bytes() as we know
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// it has been historically targeted by US agencies for 'weakening'.
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// It is still arguably better than trying to come up with an
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// alternative cryptographically secure random generator.
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// There is little point in using the optional second arg to flag the
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// assurance of security since it is meaningless if the source algorithms
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// have been compromised. Also none of this matters if RSA has been
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// compromised by state actors and evidence is mounting that this has
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// already happened.
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$result = [ 'encrypted' => true ];
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$key = openssl_random_pseudo_bytes(256);
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$iv = openssl_random_pseudo_bytes(256);
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$result['data'] = base64url_encode($fn($data,$key,$iv),true);
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// log the offending call so we can track it down
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if(! openssl_public_encrypt($key,$k,$pubkey,$padding)) {
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$x = debug_backtrace();
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logger('RSA failed. ' . print_r($x[0],true));
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}
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$result['alg'] = $alg;
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$result['key'] = base64url_encode($k,true);
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openssl_public_encrypt($iv,$i,$pubkey,$padding);
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$result['iv'] = base64url_encode($i,true);
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return $result;
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}
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else {
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$x = [ 'data' => $data, 'pubkey' => $pubkey, 'alg' => $alg, 'result' => $data ];
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call_hooks('other_encapsulate', $x);
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return $x['result'];
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}
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}
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function crypto_methods() {
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// aes256cbc is provided for compatibility with earlier zot implementations which assume 32-byte key and 16-byte iv.
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// other_encapsulate() now produces these longer keys/ivs by default so that it is difficult to guess a
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// particular implementation or choice of underlying implementations based on the key/iv length.
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// The actual methods are responsible for deriving the actual key/iv from the provided parameters;
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// possibly by truncation or segmentation - though many other methods could be used.
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$r = [ 'aes256ctr.oaep', 'camellia256cfb.oaep', 'cast5cfb.oaep', 'aes256ctr', 'camellia256cfb', 'cast5cfb', 'aes256cbc', 'aes128cbc', 'cast5cbc' ];
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call_hooks('crypto_methods',$r);
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return $r;
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}
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function signing_methods() {
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$r = [ 'sha256' ];
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call_hooks('signing_methods',$r);
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return $r;
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}
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function aes_encapsulate($data,$pubkey) {
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if(! $pubkey)
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logger('aes_encapsulate: no key. data: ' . $data);
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$key = openssl_random_pseudo_bytes(32);
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$iv = openssl_random_pseudo_bytes(16);
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$result = [ 'encrypted' => true ];
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$result['data'] = base64url_encode(AES256CBC_encrypt($data,$key,$iv),true);
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// log the offending call so we can track it down
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if(! openssl_public_encrypt($key,$k,$pubkey)) {
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$x = debug_backtrace();
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logger('aes_encapsulate: RSA failed. ' . print_r($x[0],true));
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}
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$result['alg'] = 'aes256cbc';
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$result['key'] = base64url_encode($k,true);
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openssl_public_encrypt($iv,$i,$pubkey);
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$result['iv'] = base64url_encode($i,true);
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return $result;
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}
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function crypto_unencapsulate($data,$prvkey) {
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if(! $data)
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return;
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$alg = ((is_array($data) && (array_key_exists('encrypted',$data) || array_key_exists('iv',$data))) ? $data['alg'] : '');
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if(! $alg) {
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return $data;
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}
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if($alg === 'aes256cbc') {
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return aes_unencapsulate($data,$prvkey);
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}
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return other_unencapsulate($data,$prvkey,$alg);
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}
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function other_unencapsulate($data,$prvkey,$alg) {
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// This default will change in the future. For now make it backward compatible.
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$padding = OPENSSL_PKCS1_PADDING;
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$base = $alg;
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$exts = explode('.',$alg);
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if(count($exts) > 1) {
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switch($exts[1]) {
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case 'oaep':
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$padding = OPENSSL_PKCS1_OAEP_PADDING;
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break;
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}
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$base = $exts[0];
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}
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$fn = strtoupper($base) . '_decrypt';
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if(function_exists($fn)) {
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openssl_private_decrypt(base64url_decode($data['key']),$k,$prvkey,$padding);
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openssl_private_decrypt(base64url_decode($data['iv']),$i,$prvkey,$padding);
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return $fn(base64url_decode($data['data']),$k,$i);
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}
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else {
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$x = [ 'data' => $data, 'prvkey' => $prvkey, 'alg' => $alg, 'result' => $data ];
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call_hooks('other_unencapsulate',$x);
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return $x['result'];
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}
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}
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function aes_unencapsulate($data,$prvkey) {
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openssl_private_decrypt(base64url_decode($data['key']),$k,$prvkey);
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openssl_private_decrypt(base64url_decode($data['iv']),$i,$prvkey);
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return AES256CBC_decrypt(base64url_decode($data['data']),$k,$i);
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}
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function new_keypair($bits) {
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$openssl_options = array(
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'digest_alg' => 'sha1',
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'private_key_bits' => $bits,
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'encrypt_key' => false
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);
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$conf = get_config('system','openssl_conf_file');
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if($conf)
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$openssl_options['config'] = $conf;
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$result = openssl_pkey_new($openssl_options);
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if(empty($result)) {
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logger('new_keypair: failed');
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return false;
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}
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// Get private key
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$response = array('prvkey' => '', 'pubkey' => '');
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openssl_pkey_export($result, $response['prvkey']);
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// Get public key
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$pkey = openssl_pkey_get_details($result);
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$response['pubkey'] = $pkey["key"];
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return $response;
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}
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function DerToPem($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 $result;
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}
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function DerToRsa($Der)
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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, 64);
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$body = implode("\n", $lines);
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//Get title:
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$title = 'RSA 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->SetIntBuffer($PublicExponent);
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$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 $PublicDER;
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}
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function pkcs1_encode($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->SetIntBuffer($PublicExponent);
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$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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return $bitStringValue;
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}
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// http://stackoverflow.com/questions/27568570/how-to-convert-raw-modulus-exponent-to-rsa-public-key-pem-format
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function metopem($m,$e) {
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$der = pkcs8_encode($m,$e);
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$key = DerToPem($der,false);
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return $key;
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}
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function pubrsatome($key,&$m,&$e) {
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require_once('library/asn1.php');
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$lines = explode("\n",$key);
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unset($lines[0]);
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unset($lines[count($lines)]);
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$x = base64_decode(implode('',$lines));
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$r = ASN_BASE::parseASNString($x);
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$m = base64url_decode($r[0]->asnData[0]->asnData);
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$e = base64url_decode($r[0]->asnData[1]->asnData);
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}
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function rsatopem($key) {
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pubrsatome($key,$m,$e);
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return(metopem($m,$e));
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}
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function pemtorsa($key) {
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pemtome($key,$m,$e);
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return(metorsa($m,$e));
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}
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function pemtome($key,&$m,&$e) {
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$lines = explode("\n",$key);
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unset($lines[0]);
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unset($lines[count($lines)]);
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$x = base64_decode(implode('',$lines));
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$r = ASN_BASE::parseASNString($x);
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$m = base64url_decode($r[0]->asnData[1]->asnData[0]->asnData[0]->asnData);
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$e = base64url_decode($r[0]->asnData[1]->asnData[0]->asnData[1]->asnData);
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}
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function metorsa($m,$e) {
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$der = pkcs1_encode($m,$e);
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$key = DerToRsa($der);
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return $key;
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}
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function salmon_key($pubkey) {
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pemtome($pubkey,$m,$e);
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return 'RSA' . '.' . base64url_encode($m,true) . '.' . base64url_encode($e,true) ;
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}
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function convert_salmon_key($key) {
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if(strstr($key,','))
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$rawkey = substr($key,strpos($key,',')+1);
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else
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$rawkey = substr($key,5);
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$key_info = explode('.',$rawkey);
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$m = base64url_decode($key_info[1]);
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$e = base64url_decode($key_info[2]);
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logger('key details: ' . print_r($key_info,true), LOGGER_DATA);
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$salmon_key = metopem($m,$e);
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return $salmon_key;
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}
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function z_obscure($s) {
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return json_encode(crypto_encapsulate($s,get_config('system','pubkey')));
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}
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function z_unobscure($s) {
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if(strpos($s,"{\"") !== 0)
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return $s;
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return crypto_unencapsulate(json_decode($s,true),get_config('system','prvkey'));
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}
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