ssh-x22519 ========== The twisted Edwards curve used for ed25519 signatures is birationally equivalent to the Montgomery curve used for x25519: it is straightforward to map ssh-ed25519 public keys into x25519 public keys corresponding to the same secret scalar. This tool is a simple command-line wrapper around the high-quality Go crypto libraries to perform this conversion. If ~/.ssh/id_ed25519 and ~/.ssh/id_ed25519.pub are matching ssh-ed25519 private and public keyfiles, the outputs of ssh-x25519 ~/.ssh/id_ed25519 and ssh-x25519 ~/.ssh/id_ed25519.pub are matching 32-byte x25519 private and public keys respectively. Private keys are cofactor multiples and invariant under RFC 7748 scalar clamping, so are interoperable with both clamped and non-clamped key exchange. When the supplied keyfile is encrypted, ssh-x25519 will prompt for the passphrase in the usual way before attempting to extract the private key. Building and installing ----------------------- To build the ssh-x25519 binary, run 'go build' in the source tree. To install, copy it into a directory on your path. ssh-x25519 should compile and run on any platform with Go 1.17 or later. Please report any problems or bugs to Chris Webb <[email protected]>. Copying ------- ssh-x25519 was written by Chris Webb <[email protected]> and is distributed as Free Software under the terms of the MIT license in COPYING.
Map ssh-ed25519 keys into x25519 keys
Owner
Chris Webb
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