terraform/website/docs/configuration/functions/rsadecrypt.html.md

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---
layout: "functions"
page_title: "rsadecrypt function"
sidebar_current: "docs-funcs-crypto-rsadecrypt"
description: |-
The rsadecrypt function decrypts an RSA-encrypted message.
---
# `rsadecrypt` Function
`rsadecrypt` decrypts an RSA-encrypted ciphertext, returning the corresponding
cleartext.
```hcl
rsadecrypt(ciphertext, privatekey)
```
`ciphertext` must be a base64-encoded representation of the ciphertext, using
the PKCS #1 v1.5 padding scheme. Terraform uses the "standard" Base64 alphabet
as defined in [RFC 4648 section 4](https://tools.ietf.org/html/rfc4648#section-4).
`privatekey` must be a PEM-encoded RSA private key that is not itself
encrypted.
Terraform 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.
## Examples
```
> rsadecrypt(filebase64("${path.module}/ciphertext"), file("privatekey.pem"))
Hello, world!
```