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Encryption and decryption class library

PHP encryption and decryption function class

Encryption and decryption class library

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Encryption process:
Read the source file, encrypt it with base64_encode, and use the 52 uppercase and lowercase letters obtained by shuffling as the secret key for replacement
$c=strtr (ciphertext, corresponding to the letter to be replaced, the letter to be replaced);
Link the two secret keys and the ciphertext to form the main content of the file to be encrypted
Finally, according to the template format written in advance, combine the base64_decode, strtr, and substr commands respectively, and put the combined ciphertext into the template and base64_encode the encryption here,
Write the file to be encrypted.

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