Cara menggunakan php rsa encryption

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T. Horsten explained the size limits on raw encryption. Here are two functions to encrypt/decrypt larger data when you can't use the envelope functions:

function ssl_encrypt($source,$type,$key){ //Assumes 1024 bit key and encrypts in chunks.

$maxlength=117; $output=''; while($source){ $input= substr($source,0,$maxlength); $source=substr($source,$maxlength); if($type=='private'){ $ok= openssl_private_encrypt($input,$encrypted,$key); }else{ $ok= openssl_public_encrypt($input,$encrypted,$key); }

$output.=$encrypted; } return $output; }

function ssl_decrypt($source,$type,$key){ // The raw PHP decryption functions appear to work // on 128 Byte chunks. So this decrypts long text // encrypted with ssl_encrypt().

$maxlength=128; $output=''; while($source){ $input= substr($source,0,$maxlength); $source=substr($source,$maxlength); if($type=='private'){ $ok= openssl_private_decrypt($input,$out,$key); }else{ $ok= openssl_public_decrypt($input,$out,$key); }

$output.=$out; } return $output;

}