[openssl-users] X25519 - why openssl shows server temp key as 253 bits?

M K Saravanan mksarav at gmail.com
Tue Sep 4 05:28:35 UTC 2018


When using openssl with X25519, why it shows the server temp key as 253 bits?


No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA
Server Temp Key: X25519, 253 bits

I thought Curve25519 is using 256 bit keys.

Why 253 instead of 256?

with regards,

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