From the spec:
REQUIRED TRIPLEDES
http://www.w3.org/2001/04/xmlenc#tripledes-cbc
REQUIRED AES-128
http://www.w3.org/2001/04/xmlenc#aes128-cbc
REQUIRED AES-256
http://www.w3.org/2001/04/xmlenc#aes256-cbc
OPTIONAL AES-192
http://www.w3.org/2001/04/xmlenc#aes192-cbc
REQUIRED RSA-v1.5
http://www.w3.org/2001/04/xmlenc#rsa-1_5
REQUIRED RSA-OAEP
http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p
OPTIONAL Diffie-Hellman
http://www.w3.org/2001/04/xmlenc#dh
REQUIRED TRIPLEDES KeyWrap
http://www.w3.org/2001/04/xmlenc#kw-tripledes
REQUIRED AES-128 KeyWrap
http://www.w3.org/2001/04/xmlenc#kw-aes128
REQUIRED AES-256 KeyWrap
http://www.w3.org/2001/04/xmlenc#kw-aes256
OPTIONAL AES-192 KeyWrap
http://www.w3.org/2001/04/xmlenc#kw-aes192
REQUIRED SHA1
http://www.w3.org/2000/09/xmldsig#sha1
RECOMMENDED SHA256
http://www.w3.org/2001/04/xmlenc#sha256
OPTIONAL SHA512
http://www.w3.org/2001/04/xmlenc#sha512
OPTIONAL RIPEMD-160
http://www.w3.org/2001/04/xmlenc#ripemd160
RECOMMENDED XML Digital Signature
http://www.w3.org/TR/2001/CR-xmldsig-core-20010419/
OPTIONAL Canonical XML with Comments
http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments
OPTIONAL Canonical XML (omits comments)
http://www.w3.org/TR/2001/REC-xml-c14n-20010315
REQUIRED base64
http://www.w3.org/2000/09/xmldsig#base64