PHP Hash cipher Function Sample code

A hash is the conversion of the target text into an irreversible hash string (or message digest) of the same length, whereas encryption (Encrypt) converts the target text into a reversible cipher with different lengths. This article mainly introduces PHP commonly used hash encryption function, in the case of a detailed analysis of PHP hash encryption function usage, code with detailed comments, easy to understand, the need for friends can refer to, The specific analysis is as follows:

$hash _list=hash_algos ();  Returns the list of registered hash rules Print_r ($hash _list); Show results

Create a file to calculate the hash value: file_put_contents (' example.txt ', ' The quick brown fox jumped over the the lazy Dog. ');

Output hash Value information:

echo hash_file (' MD5 ', ' example.txt ');      $str = "The quick brown fox jumped over the lazy dog.";           Defines the string echo hash (' ripemd160 ', $str);          Generates a hash value $ctx =hash_init (' MD5 ');       Initialize a hash value of hash_update ($ctx, ' The quick brown fox ');      Pour the data into the hash value hash_update ($ctx, ' jumped over the lazy dog ');          Perfusion data to the hash echo hash_final ($CTX);    The final result of the output $STR = "The quick brown fox jumped over the the lazy dog.";            Defines the string $fp =tmpfile ();            Create a temporary file fwrite ($fp, $STR);            Writes a string to a temporary file rewind ($FP);          Rewind the position of the file pointer $ctx =hash_init (' MD5 ');         Initializes a hash value of Hash_update_stream ($ctx, $fp);          Perfusion data into the data flow echo hash_final ($CTX);    The Output $str = "The quick brown fox jumped over the the lazy dog.";      Defines the string echo hash_hmac (' ripemd160 ', $str, ' secret ');          Generate a hash value that contains the key/* Create a file and write the string to it */$file = "Example.txt";   Define the file name $str = "The quick brown fox jumped over the the lazy dog.";        Defines the string file_put_contents ($file, $STR); Writing a string to a file echo Hash_hmac_filE (' MD5 ', $file, ' secret ');          Generates a hash value that contains the key $ctx =hash_init (' SHA1 ');  Define the string hash_update ($ctx, ' The quick brown fox jumped over the the lazy Dog. ');  Perfusion data into hashes echo hash_final ($CTX); Output results