Support SAML assertion encryption as SP

[spwitt]

Support SAML assertion encryption as SP

Problem

As a SAML Service Provider (SP), FusionAuth does not support receiving encrypted SAML assertions from an external SAML IdP.

Solution

When FusionAuth is acting as the SAML SP:

1. Allow configuring a key/certificate pair in Key Master. The private key will be used by FusionAuth for assertion decryption. The certificate will be shared with the SAML IdP for assertion encryption.
2. Update SAML IdP configuration in FusionAuth to provide settings for SAML decryption as the SP
3. Use the configured private key to decrypt the encrypted SAML assertions

Alternatives/workarounds

None.

Additional context

Split from

• Support SAML assertion encryption as IdP #1741

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