[rustls] identity: handle elliptic curve private keys #1526
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This commit improves the user experience of the users leveraging rustls.
When building the identity to use for requests, it's now possible to use also private keys using Elliptic Curve that are encoded with SEC1 standard.
This is the default encoding used by openssl when EC keys are created. Prior to this commit users had to convert those keys from the SEC1 encoding to the PKCS 8 one, which is something not trivial.
This feature has been recently added to rustls-pemfile crate. This commit update the
rustls-pemfile
crate to its latest stable release.I also had to change a little the code used to extract the private keys from the PEM file. That's because
rustls-pemfile
doens't provide a high level API that extracts Elliptic Curve keys.