SshRsaSignaturePayload Class
RFC4253: 6.6. Public Key Algorithms "ssh-rsa" signature format string algorithm name ("ssh-rsa", "rsa-sha2-256" or "rsa-sha2-512") string rsa_signature_blob
The value for 'rsa_signature_blob' is encoded as a string containing s (which is an integer, without lengths or padding, unsigned, and in network byte order).
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