fix corrupted saml2 metadata once special characters are present

[JannickWeisshaupt]

Fixes corrupted Saml2Metadata once special characters are present. The cause of this bug is that the length in bytes, which is correct for the content length is not equal to the java string length.

See Issue #13776

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[marcusdacoregio]

Hi @JannickWeisshaupt, can you add a test that verifies the correct behavior? In addition to that, can you please target the 5.8.x branch? If you do not have time to do that let me know so I will go ahead and do that on my side.

[JannickWeisshaupt]

Hi @marcusdacoregio, should be done!

[marcusdacoregio]

Nice @JannickWeisshaupt. In preparation for merging, can you please squash your commits into one? Ideally, the single commit should have the following message:

Fix corrupted saml2 metadata when special characters are present

Closes gh-13776

[JannickWeisshaupt]

Commits are squashed @marcusdacoregio

[marcusdacoregio]

Thanks, @JannickWeisshaupt. This is now merged into 5.8.x, 6.0.x, 6.1.x and main