![]() OpenSSH version 7.2, but not 7.2p2) have been found to encode RSA signatures using the new signature methods rsa-sha2-256 and rsa-sha2-512 in a way that is not compatible with the specification of these methods. Our SSH Server, SSH Client, and FlowSsh now take steps to support generating and validating signatures using such keys.Ĭertain implementations (e.g. Most SSH implementations do not generate odd-sized RSA keys, but there are old versions of PuTTY which do (e.g. Windows CNG, as used by our new cryptographic provider in versions 7.xx, has been found to return an incorrect signature size for odd-sized RSA keys (e.g. Our SSH Server, SSH Client, and FlowSsh now re-encode RSA signatures, so that smaller-than-expected ones can verify correctly. ![]() With our software versions 7.12, this has resulted in occasional connection or login attempt failures. Windows CNG has been found to not validate such signatures as presented. SSH implementations have a chance of generating RSA signatures slightly smaller than expected with a small probability (e.g.
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