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pmeulen
/ public_encrypt_decrypt.php
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November 17, 2025 21:17
Functions for encrypting and decrypting data with RSA public key crypto using the PHP openssl_* functions.
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| <?php | |
| /** | |
| * Encrypt $plaintext using $rsa_public_key | |
| * | |
| * To decrypt the data the RSA private that corresponds to the $rsa_public_key is required. | |
| * | |
| * Because public key crypto is not suitable for arbitrary length data, encryption is done in two steps | |
| * 1. Generate a random symmetric key and encrypt the plaintext with that key |
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| # Put this file under /etc/spamassassin/ and run an sa-update or reload amavis etc. | |
| # | |
| #-------------------------------------------------- | |
| # The only RBL I trust, UCEPROTECT1 (single IP, not IP-ranges or entire ISPs) http://uceprotect.net | |
| #-------------------------------------------------- | |
| header RCVD_IN_UCEPROTECT1 eval:check_rbl_txt('uceprotect1', 'dnsbl-1.uceprotect.net') | |
| describe RCVD_IN_UCEPROTECT1 Listed in dnsbl-1.uceprotect.net | |
| tflags RCVD_IN_UCEPROTECT1 net | |
| score RCVD_IN_UCEPROTECT1 1.8 |