To store the encrypted data in a MySQL database, you first have to encode the data so it can safely be written. $res1 = openssl_get_privatekey ( $priv_key, $passphrase ) Openssl_public_encrypt ( substr ( $source, $j ), $crypttext, $pub_key ) įunction decrypt ( $crypttext, $userid ) $source="sumanth ahoiadodakjaksdsa ldadkkllksdalkalsdl asld ls sumanthasddddddddddddddddddddddddddddddddfsdfsffdfsdfsumanth" path holds the certificate path present in the system Openssl_pkey_export ( $privkey, $privatekey, $privkeypass ) Openssl_x509_export ( $sscert, $publickey ) $sscert = openssl_csr_sign ( $csr, null, $privkey, $numberofdays ) $csr = openssl_csr_new ( $dn, $privkey ) $privkey = openssl_pkey_new (array( 'private_key_bits' => 1024, 'private_key_type' => OPENSSL_KEYTYPE_RSA )) Here its initialized to 1234 for sample Passphrase can be taken during registration Length of the data 'XX', "stateOrProvinceName" => 'State', "localityName" => 'SomewhereCity', "organizationName" => 'MySelf', "organizationalUnitName" => 'Whatever', "commonName" => 'mySelf', "emailAddress" => ) To better break down rstinnett's example: It can take the resource $key returned from openssl_pkey_get_public() OR find the value is text and passes the text to openssl_pkey_get_public() to get a valid resource. The $key is explained in, and mostly the same as the parameter of The confusion most have seems to be on "mixed $key" So either of those will comfortably fit inside a single RSA encryption. A hash is typically 128-256 bits (the PHP sha1() function returns a 160 bit hash). With a 2048-bit key it's 1960 bits instead.īut as chsnyder correctly wrote, the normal application of a public key encryption algorithm is to store a key or a hash of the data you want to respectively encrypt or sign. So the highest number of bits you can encrypt with a 1024-bit key is 936 bits because of this (unless you disable the padding by adding the OPENSSL_NO_PADDING flag, in which case you can go up to 1023-1024 bits). However, the PKCS#1 standard, which OpenSSL uses, specifies a padding scheme (so you can encrypt smaller quantities without losing security), and that padding scheme takes a minimum of 11 bytes (it will be longer if the value you're encrypting is smaller). So if you have a 1024-bit key, in theory you could encrypt any 1023-bit value (or a 1024-bit value smaller than the key) with that key. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto searchĬhsnyder writes that the data is limited to 936 bits in his implementation.Īctually, it has nothing to do with RSA being CPU intensive, RAM or anything of the sort.īasically when you encrypt something using an RSA key (whether public or private), the encrypted value must be smaller than the key (due to the maths used to do the actual encryption).
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