rsadecrypt Function

rsadecrypt decrypts an RSA-encrypted ciphertext, returning the corresponding cleartext.

rsadecrypt(ciphertext, privatekey)

ciphertext must be a base64-encoded representation of the ciphertext, using the PKCS #1 v1.5 padding scheme. OpenTofu uses the "standard" Base64 alphabet as defined in RFC 4648 section 4 (opens in a new tab).

privatekey must be a PEM-encoded RSA private key that is not itself encrypted.

OpenTofu has no corresponding function for encrypting a message. Use this function to decrypt ciphertexts returned by remote services using a keypair negotiated out-of-band.


> rsadecrypt(filebase64("${path.module}/ciphertext"), file("privatekey.pem"))
Hello, world!