There are configurations options in the SAML2SignatureGenerationHandler for SIGN_METHOD and SIGN_DIGEST
https://docs.jboss.org/author/display/PLINK/SAML2SignatureGenerationHandler
Commit where this was added:
https://github.com/picketlink/picketlink/commit/f253a02a81de6f200342ec50eab38b20d40f6151
Looks like it was in v2.6.0
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