PHP summarizes several methods for source code encryption (recommended), and php source code

PHP summarizes several methods for source code encryption (recommended), and php source code

Although sharing is a traditional virtue, sometimes we have worked so hard to write programs to sell small money, earn a little hard work, and prevent some unscrupulous people from selling them, so we have to encrypt our program. Here we will introduce how to encrypt our PHP source code through PHP custom functions.

First Method

<? Php function encode_file_contents ($ filename) {$ type = strtolower (substr (strrchr ($ filename ,'. '), 1); if ('php' = $ type & is_file ($ filename) & is_writable ($ filename )) {// If the PHP file is writable, compress the code $ contents = file_get_contents ($ filename); // checks whether the file has been encoded and processed $ contents = php_strip_whitespace ($ filename ); // remove the PHP header and tail identifiers $ headerPos = strpos ($ contents, '<? Php '); $ footerPos = strrpos ($ contents,'?> '); $ Contents = substr ($ contents, $ headerPos + 5, $ footerPos-$ headerPos); $ encode = base64_encode (gzdeflate ($ contents )); // start encoding $ encode = '<? Php '. "\ n eval (gzinflate (base64_decode (". "'". $ encode. "'". "); \ n?> "; Return file_put_contents ($ filename, $ encode);} return false;} // call the function $ filename = 'dam. php '; encode_file_contents ($ filename); echo "OK, encryption is complete! "?>

Method 2

<? Php function RandAbc ($ length = "") {// returns a random string $ str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; return str_shuffle ($ str);} $ filename = 'index. php '; // the file to be encrypted $ T_k1 = RandAbc (); // random key 1 $ T_k2 = RandAbc (); // random key 2 $ vstr = file_get_contents ($ filename); $ v1 = base64_encode ($ vstr); $ c = strtr ($ v1, $ T_k1, $ T_k2 ); // replace the corresponding character with the key. $ C = $ T_k1. $ T_k2. $ c; $ q1 = "O00O0O"; $ q2 = "O0O000"; $ q3 = "O0OO00"; $ q4 = "OO0O00"; $ q5 = "OO0000 "; $ q6 = "O00OO0"; $ s = '$ '. $ q6. '= urldecode ("% 6E1% 7A % 62% 2F % 6D % 615% 5C % 76% 740% 6928% 2D % 70% 78% 75% 71% 2A6% 6C % 79% 6B % 72% 5F % 65% 68% 63% 73% 77% 6F4% 2B % 6637% 6A "); $ '. $ q1. '= $ '. $ q6. '{3 }. $ '. $ q6. '{6 }. $ '. $ q6. '{33 }. $ '. $ q6. '{30}; $ '. $ q3. '= $ '. $ q6. '{33 }. $ '. $ q6. '{10 }. $ '. $ q6. '{24 }. $ '. $ q6. '{10 }. $ '. $ q6. '{24}; $ '. $ q4. '= $ '. $ q3. '{0 }. $ '. $ q6. '{18 }. $ '. $ q6. '{3 }. $ '. $ q3. '{0 }. $ '. $ q3. '{1 }. $ '. $ q6. '{24}; $ '. $ q5. '= $ '. $ q6. '{7 }. $ '. $ q6. '{13}; $ '. $ q1 .'. = $ '. $ q6. '{22 }. $ '. $ q6. '{36 }. $ '. $ q6. '{29 }. $ '. $ q6. '{26 }. $ '. $ q6. '{30 }. $ '. $ q6. '{32 }. $ '. $ q6. '{35 }. $ '. $ q6. '{26 }. $ '. $ q6. '{30}; eval ($ '. $ q1 .'("'. base64_encode ('$ '. $ q2. '= "'. $ c. '"; eval (\'?> \'. $ '. $ Q1. '($ '. $ q3. '($ '. $ q4. '($ '. $ q2. ', $ '. $ q5. '* 2), $ '. $ q4. '($ '. $ q2. ', $ '. $ q5. ', $ '. $ q5. '), $ '. $ q4. '($ '. $ q2. ', 0, $ '. $ q5 .'))));'). '");'; $ s = '<? Php '. "\ n". $ s. "\ n".'?> '; // Echo $ s; // generate the encrypted PHP File $ fpp1 = fopen ('temp _'. $ filename, 'w'); fwrite ($ fpp1, $ s) or die ('file writing error');?>

Third Method

<? Php class text_auth {var $ n_iter; function text_auth () {$ this-> setIter (32);} function setIter ($ n_iter) {$ this-> n_iter = $ n_iter ;} function getIter () {return $ this-> n_iter;} function encrypt ($ data, $ key) {$ n = $ this-> _ resize ($ data, 4 ); $ data_long [0] = $ n; $ n_data_long = $ this-> _ str2long (1, $ data, $ data_long); $ n = count ($ data_long ); if ($ n & 1) = 1) {$ data_long [$ n] = chr (0); $ n_data_long + + ;}$ This-> _ resize ($ key, 16, true); if (''= $ key) $ key = '123 '; $ n_key_long = $ this-> _ str2long (0, $ key, $ key_long); $ enc_data = ''; $ w = array (0, 0); $ j = 0; $ k = array (0, 0, 0, 0); for ($ I = 0; $ I <$ n_data_long; ++ $ I) {if ($ j + 4 <= $ n_key_long) {$ k [0] = $ key_long [$ j]; $ k [1] = $ key_long [$ j + 1]; $ k [2] = $ key_long [$ j + 2]; $ k [3] = $ key_long [$ j + 3];} else {$ k [0] = $ key_long [$ J % $ n_key_long]; $ k [1] = $ key_long [($ j + 1) % $ n_key_long]; $ k [2] = $ key_long [($ j + 2) % $ n_key_long]; $ k [3] = $ key_long [($ j + 3) % $ n_key_long] ;}$ j = ($ j + 4) % $ n_key_long; $ this-> _ encipherLong ($ data_long [$ I], $ data_long [++ $ I], $ w, $ k); $ enc_data. = $ this-> _ long2str ($ w [0]); $ enc_data. = $ this-> _ long2str ($ w [1]);} return $ enc_data;} function decrypt ($ enc_data, $ key) {$ n_enc_data_long = $ thi S-> _ str2long (0, $ enc_data, $ enc_data_long); $ this-> _ resize ($ key, 16, true); if (''= $ key) $ key = '000000'; $ n_key_long = $ this-> _ str2long (0, $ key, $ key_long); $ data = ''; $ w = array (0, 0); $ j = 0; $ len = 0; $ k = array (0, 0, 0, 0); $ pos = 0; for ($ I = 0; $ I <$ n_enc_data_long; $ I + = 2) {if ($ j + 4 <= $ n_key_long) {$ k [0] = $ key_long [$ j]; $ k [1] = $ key_long [$ j + 1]; $ k [2] = $ key_long [$ J + 2]; $ k [3] = $ key_long [$ j + 3];} else {$ k [0] = $ key_long [$ j % $ n_key_long]; $ k [1] = $ key_long [($ j + 1) % $ n_key_long]; $ k [2] = $ key_long [($ j + 2) % $ n_key_long]; $ k [3] = $ key_long [($ j + 3) % $ n_key_long];} $ j = ($ j + 4) % $ n_key_long; $ this-> _ decipherLong ($ enc_data_long [$ I], $ enc_data_long [$ I + 1], $ w, $ k); if (0 = $ I) {$ len = $ w [0]; if (4 <= $ len) {$ data. = $ this-> _ long2str ($ w [1]);} els E {$ data. = substr ($ this-> _ long2str ($ w [1]), 0, $ len % 4) ;}} else {$ pos = ($ I-1) * 4; if ($ pos + 4 <= $ len) {$ data. = $ this-> _ long2str ($ w [0]); if ($ pos + 8 <= $ len) {$ data. = $ this-> _ long2str ($ w [1]);} elseif ($ pos + 4 <$ len) {$ data. = substr ($ this-> _ long2str ($ w [1]), 0, $ len % 4) ;}} else {$ data. = substr ($ this-> _ long2str ($ w [0]), 0, $ len % 4) ;}} return $ data;} function _ encipherLon G ($ y, $ z, & $ w, & $ k) {$ sum = (integer) 0; $ delta = 0x9E3779B9; $ n = (integer) $ this-> n_iter; while ($ n --> 0) {$ y = $ this-> _ add ($ y, $ this-> _ add ($ z <4 ^ $ this-> _ rshift ($ z, 5), $ z) ^ $ this-> _ add ($ sum, $ k [$ sum & 3]); $ sum = $ this-> _ add ($ sum, $ delta ); $ z = $ this-> _ add ($ z, $ this-> _ add ($ y <4 ^ $ this-> _ rshift ($ y, 5 ), $ y) ^ $ this-> _ add ($ sum, $ k [$ this-> _ rshift ($ sum, 11) & 3]);} $ w [0] = $ y; $ w [1] = $ Z;} function _ decipherLong ($ y, $ z, & $ w, & $ k) {$ sum = 0xC6EF3720; $ delta = 0x9E3779B9; $ n = (integer) $ this-> n_iter; while ($ n --> 0) {$ z = $ this-> _ add ($ z, -($ this-> _ add ($ y <4 ^ $ this-> _ rshift ($ y, 5), $ y) ^ $ this-> _ add ($ sum, $ k [$ this-> _ rshift ($ sum, 11) & 3]); $ sum = $ this-> _ add ($ sum,-$ delta); $ y = $ this-> _ add ($ y, -($ this-> _ add ($ z <4 ^ $ this-> _ rshift ($ z, 5), $ z) ^ $ this-> _ add ($ sum, $ k [$ su M & 3]);} $ w [0] = $ y; $ w [1] = $ z;} function _ resize (& $ data, $ size, $ nonull = false) {$ n = strlen ($ data); $ nmod = $ n % $ size; if (0 = $ nmod) $ nmod = $ size; if ($ nmod> 0) {if ($ nonull) {for ($ I = $ n; $ I <$ n-$ nmod + $ size; ++ $ I) {$ data [$ I] = $ data [$ I % $ n] ;}} else {for ($ I = $ n; $ I <$ n-$ nmod + $ size; ++ $ I) {$ data [$ I] = chr (0) ;}} return $ n ;} function _ hex2bin ($ str) {$ len = Strlen ($ str); return pack ('H '. $ len, $ str);} function _ str2long ($ start, & $ data, & $ data_long) {$ n = strlen ($ data ); $ tmp = unpack ('n' * ', $ data); $ j = $ start; foreach ($ tmp as $ value) $ data_long [$ j ++] = $ value; return $ j;} function _ long2str ($ l) {return pack ('n', $ l);} function _ rshift ($ integer, $ N) {if (0 xffffffff <$ integer |-0 xffffffff> $ integer) {$ integer = fmod ($ integer, 0 xffffffffff + 1 );} If (0x7fffffff <$ integer) {$ integer-= 0 xffffffff + 1.0;} elseif (-0x80000000> $ integer) {$ integer + = 0 xffffffff + 1.0;} if (0> $ integer) {$ integer & = 0x7fffffff; $ integer >>=$ n; $ integer | = 1 <(31-$ n);} else {$ integer >>=$ n;} return $ integer;} function _ add ($ i1, $ i2) {$ result = 0.0; foreach (func_get_args () as $ value) {if (0.0> $ value) {$ value-= 1.0 + 0 xffffffff;} $ re Sult + = $ value;} if (0 xffffffff <$ result |-0 xffffffff> $ result) {$ result = fmod ($ result, 0 xffffffff + 1 );} if (0x7fffffff <$ result) {$ result-= 0 xffffffff + 1.0;} elseif (-0x80000000> $ result) {$ result + = 0 xffffffff + 1.0 ;} return $ result ;}?> For how to use it, see // view sourceprint in the encryption process? $ Text_file = S_ROOT. '. /456. php '; $ str = @ file_get_contents ($ text_file); require_once S_ROOT. ". /text_auth.php "; $ text_auth = new text_auth (64); $ str = $ text_auth-> encrypt ($ str," qianyunlai.com "); $ filename = S_ROOT. '. /789. php '; // The encrypted text is binary. A common text editor cannot view file_put_contents ($ filename, $ str); // view sourceprint during decryption? 01 $ text_file = S_ROOT. '. /789. php '; $ str = @ file_get_contents ($ text_file); require_once S_ROOT. ". /text_auth.php "; $ text_auth = new text_auth (64); $ str = $ text_auth-> decrypt ($ str," qianyunlai.com "); $ filename = S_ROOT. '. /456. php '; file_put_contents ($ filename, $ str );

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