SAML 2.0 Subject EncryptedKey should contain KeyInfo

When the STS issues a SAML 2.0 Assertion for the SymmetricKey case, it generates a Subject that looks like:

<saml:Subject><saml:NameID NameQualifier="urn:picketlink:identity-federation">admin</saml:NameID><saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:holder-of-key"><saml:SubjectConfirmationData><ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><xenc:EncryptedKey xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"><xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5"/><xenc:CipherData><xenc:CipherValue>i48AXLPCf+QwOZLzp/lEzFxUbUnnYPW7ja2dESnRlDiCY3i6sfP7DEvLFTmOZMF58G6ag9v2E/yp
SsZz3u+OTEuBZSYRTNlbJ8aMjwAcn6fpqoO/iQDzBQ1lsPhrvfxFa3zXsBihZLMB3mNmDFqRKm0g
mhMh/n5MYZ5J3mCj1z8=</xenc:CipherValue></xenc:CipherData></xenc:EncryptedKey></ds:KeyInfo></saml:SubjectConfirmationData></saml:SubjectConfirmation></saml:Subject>

However, the EncryptedKey Element should contain a KeyInfo element that references the key that was used to encrypt the symmetric key contained in the CipherData. If the recipient has multiple private keys then it will have to rely on trial and error to find the correct one to use.