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$ openssl.exe genpkey -algorithm sphincssha256128frobust -out sphincssha256.pri
$ openssl.exe pkey -in sphincssha256.pri -pubout -out signing.pub
-----BEGIN PUBLIC KEY-----
MC0wCAYGK84PBgQBAyEAJ9ROIq0Estmijo9sCHZPgiM0rGUgt9jKPZJMCZEhghs=
-----END PUBLIC KEY-----