How to Encrypt or Decrypt a String in PHP

In the PHP programming language, Encryption, as well as Decryption of string data, is accomplished using the OpenSSL function. Here, we can encrypt and decrypt value through openssl_encrypt(data) and openssl_decrypt(data) respectively. We can use a single method or both methods of PHP language.

1. openssl_encrypt(data) Method

The encrypt function uses to encode the input value with many functionalities. We can get output values in difficult and safe coded formats.

Syntax:

The following syntax is used for the encrypt string data using php language.

string openssl_encrypt( string $data_input, string $method_input, 
	         string $key_input, $options = 0, 
	          string $iv_input, string $tag = NULL,
                                   string $adv_input, int $tag_length = 12  )

Parameters:

Now, we can discuss syntax parameters for better understanding.

$data_input:It contains the input string or given data that need to be encrypted in the program.
$method_input:The cipher method contains inside of the encrypt function using the "openssl_get_cipher_methods()" function.
$key_input:It contains the encryption key for functionality.
$options:It contains the bitwise disjunction of the flag. The flag value represents the "OPENSSL_RAW_DATA" and "OPENSSL_ZERO_PADDING" data.
$iv_input:It contains the initialization vector data. This data should not be NULL.
$tag:It contains the authentication tag. It is used for passing the reference when using AEAD cipher mode. The cipher mode such as a GCM or CCM.
$adv_input:It contains the additional authentication input value for encrypt function.
$tag_length:It includes the length of the authentication input tag. The length of the authentication tag used from the 4 to 16 values for GCM mode.

Return Value:

The output value returns the encrypted string value on success.
It shows a FALSE output value on failure.

2. openssl_decrypt(data) method

The decrypt function uses to decode the input value with much functionality. We can get the output value in the original format from the coded format.

Syntax

The following syntax uses for the decrypt string data using php language.

string openssl_decrypt( string $data_input, string $method_input, 
		         string $key_input, $options = 0, 
		          string $iv_input, string $tag = NULL, string $adv_input)

parameters:

Now, we can discuss syntax parameters for better understanding.

$data_input:It contains the input string or given data that need to be decrypted in the program.
$method_input:The cipher method contains inside of the decrypt function using the "openssl_get_cipher_methods()" function.
$key_input:It contains the decryption key for functionality.
$options:It contains the bitwise disjunction of the flag. The flag value represents the "OPENSSL_RAW_DATA" and "OPENSSL_ZERO_PADDING" data.
$iv_input:It contains the initialization vector data. This data should not be NULL.
$tag:It contains the authentication tag. It is used for passing the reference when using AEAD cipher mode. The cipher mode such as a GCM or CCM.
$adv_input:It contains the additional authentication input value for the decrypt function.

Return Value:

The output value returns the decrypted string value on success.
It shows a FALSE output value on failure.

Examples

The following examples show we encrypt and decrypt a string data using a php language.

Example1

The following example shows encrypting a string of data using a php language.

We require the input string, cipher method, and encryption key value to encrypt a string value.

<?php
// Original string value works to encrypt the value
$original_string = "Welcome to JavaTpoint learners \n";
// Print the original input string
echo "Original String: " .$original_string. "<br>";
// Store the cipher method for encrypting
$ciphering_value = "AES-128-CTR";
// Store the encryption key
$encryption_key = "JavaTpoint";
// Use openssl_encrypt() function for encrypting the data
$encryption_value   = openssl_encrypt($original_string, $ciphering_value, $encryption_key);                  
// Display the encrypted string
echo "<br> <br> Encrypted Input String: " . $encryption_value  . "\n";
?>

Output

The following output shows encrypting a string of data using a php language.

How to Encrypt or Decrypt a String in PHP

Example2

The following example shows the basic decrypting of string data using a php language. We require the input string, cipher method, and encryption key value to encrypt a string value. The encrypted value works as an input for decrypting data.

<?php
// Original string value works to encrypt the value
$original_string = "Welcome to JavaTpoint learners \n";
// Print the original input string
echo "Original String: " .$original_string;
// Store the cipher method 
$ciphering_value = "AES-128-CTR"; 
// Store the encryption key
$encryption_key = "JavaTpoint";
// Use openssl_encrypt() function 
$encryption_value = openssl_encrypt($original_string, $ciphering_value, $encryption_key); 
// Display the encrypted input string data
echo "<br> <br> Encrypted Input String: " . $encryption_value  . "\n";
$decryption_key = "JavaTpoint";
// Use openssl_decrypt() function to decrypt the data
$decryption_value = openssl_decrypt($encryption_value, $ciphering_value, $decryption_key); 
// Display the decrypted string as an original data
echo "<br> <br> Decrypted Input String: " .$decryption_value. "\n";
?>

Output

The following output shows encrypting a string of data using a php language.

Original String: Welcome to JavaTpoint learners

Encrypted Input String: 47Qv+Tl92fM9MQyevgN3tyMA92KyNamCfx1ptqJ6R8Y=

Decrypted Input String: Welcome to JavaTpoint learners

Example3

The following example shows the basic decrypting of string data using a php language. We can use the multiple string functions in encrypt and decrypt functions.

<?php
$original_string = "Welcome to JavaTpoint advance learner \n";
// Print the original input string
echo "Original String: " .$original_string;
// Store the cipher method 
$ciphering_value = "AES-128-CTR"; 
$iv_length = openssl_cipher_iv_length($ciphering_value);
$options = 0;
$encryption_iv_value = '11121';
// Store the encryption key
$encryption_key = "JavaTpoint";
// Use openssl_encrypt() function 
$encryption_value = openssl_encrypt($original_string, $ciphering_value, $encryption_key, $options,$encryption_iv_value); 
// Display the encrypted input string data
echo "<br><br> Encrypted Input String: " . $encryption_value  . "\n";
$decryption_key = "JavaTpoint";
// Use openssl_decrypt() function to decrypt the data
$decryption_value = openssl_decrypt($encryption_value, $ciphering_value, $decryption_key, $options,$encryption_iv_value); 
// Display the decrypted string as an original data
echo "<br><br> Decrypted Input String: " .$decryption_value. "\n";
?>

Output

The following output shows encrypting a string of data using a php language.

Example4

The following example shows the basic decrypting of string data using a php language. We can use the multiple dynamic string functions in encrypt and decrypt functions.

<?php
$original_string = "Welcome to JavaTpoint With Dynamic Functions \n";
// Print the original input string
echo "Original String: " .$original_string;
// Store the cipher method 
$ciphering_value = "BF-CBC"; 
$iv_length = openssl_cipher_iv_length($ciphering_value);
$options = 0;
$encryption_iv_value = random_bytes($iv_length);
// Store the encryption key
$encryption_key =  openssl_digest(php_uname(), 'MD5', TRUE);
// Use openssl_encrypt() function 
$encryption_value = openssl_encrypt($original_string, $ciphering_value, $encryption_key, $options,$encryption_iv_value); 
// Display the encrypted input string data
echo "<br><br> Encrypted Input String: " . $encryption_value  . "\n";
$decryption_key =  openssl_digest(php_uname(), 'MD5', TRUE);
// Use openssl_decrypt() function to decrypt the data
$decryption_value = openssl_decrypt($encryption_value, $ciphering_value, $decryption_key, $options,$encryption_iv_value); 
// Display the decrypted string as an original data
echo "<br><br> Decrypted Input String: " .$decryption_value. "\n";
?>

Output

The following output shows encrypting a string of data using a php language.

Conclusion

The encrypt and decrypt string is an essential and safe function for the development process. It keeps and retrieves data safely without licking important values. The php functions create and display data without licking and destroying the original value.

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