Fixed a bug on ArtifactResolutionService introduced by a previous commit on new SHA signatures support.

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Support for RSA_SHA256, RSA_SHA384 and RSA_SHA512 in HTTP Redirect binding. Signature algorithm can now be set also in the remote IdP metadata, with more priority than the one specified in hosted SP metadata.

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Thanks to Dick Visser for implementing it!

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Thansk to Thijs Kinkhorst for indentifying the problem!

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Thanks to Thijs Kinkhorst for providing this patch!

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3178 44740490-163a-0410-bde0-09ae8108e29a

Thanks to Thijs Kinkhorst for providing this patch!

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Added support for RSA-SHA256, RSA-SHA384 and RSA-SHA512 signature algorithms. New hosted IdP metadata option 'signature.algorithm' to configure this, defaults to SHA1 for backwards compatibility.

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Since the "about service"-link takes the user away from the IdP, the
user will still have an session on the IdP. This option allows us to
disable that link.

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When the user reaches the consent page, they are logged in, but there
was no way to log out from that page. This patch attempts to solve that
problem.

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Merged into trunk from r3150.

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Multiple servers support in radius module. Implies new configuration options (but is backwards compatible).

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Fix for issue #509. Check symmetric key length once decrypted, to make sure it is the same size as expected.

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This option allows us to disable some encryption algorithms.

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See: http://www.nds.rub.de/research/publications/breaking-xml-encryption-pkcs15/

This fix avoids the problems described in that paper by taking two
measures:
- Require that decrypted contents is at least 4 bytes, since that is the
  shortest length of an XML element.
- Generate a (invalid) symmetric key that is deterministic for a given
  encrypted key and private key.

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