SHA-256 support was added to many components of Notes/Domino 9.0

HCL Notes/Domino 8.5 Forum (includes Notes Traveler)

Subject:

SHA-2 is a "family" of hash algorithms that includes SHA-256, SHA-384, and SHA-512.

Some of these are described on the Notes/Domino wiki, excerpts below.

http://www-10.lotus.com/ldd/dominowiki.nsf/dx/supported-key-sizes-in-notesdomino

You should be able to find a copy of my presentation from Connect 2013, which goes into much greater detail on this topic.

Password-derived keys (ID file encryption keys):

Support for 128 bit AES and 256 bit AES with iterated HMAC-SHA256 and iterated HMAC-SHA512 was added and enabled in 9.0
...

S/MIME

SHA-256, SHA-384, and SHA-512 signature support added in 9.0
AES-128, AES-192, and AES-256 encryption support added in 9.0
....

Security Assertion Markup Language (SAML) Service Provider

This feature was added in 9.0 and was never subject to export restrictions.

Supported DigestMethod Algorithms:http://www.w3.org/2000/09/xmldsig#sha1http://www.w3.org/2001/04/xmlenc#sha256

Supported SignatureMethod Algorithms:http://www.w3.org/2000/09/xmldsig#rsa-sha1http://www.w3.org/2001/04/xmldsig-more#rsa-sha256
...

Transport Layer Security (TLS) v1.2

This feature was added in 9.0 and was never subject to export restrictions.
Requires selecting "IBM HTTP Server" install-time option
Supports ciphers that use AES and SHA-2

Feedback response number DKEN9N4NVK created by ~Ben Umboosichekader on 08/18/2014