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I'm using Bouncy Castle API and I have ECPublicKey object but I'm not sure exactly how to construct a OpenSSH authorized key from there. I don't know what the format looks like. I'm thinking my solution would be similar to how it's done for RSA and DSA.. Decoding RSA/DSA Public Key

Does anyone have any suggestions?

Dehang Zheng
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1 Answers1

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The format of ECDSA keys is described in the RFC5656:

In short:

The "ecdsa-sha2-*" key formats all have the following encoding:

string   "ecdsa-sha2-[identifier]"
byte[n]  ecc_key_blob

The ecc_key_blob value has the following specific encoding:

string   [identifier]
string   Q
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Jakuje
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