79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
/*
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SSHSecure - a program to harden OpenSSH from defaults
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Copyright (C) 2020 Brent Saner
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package sshkeys
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// Needed for V1 key format.
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const (
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KeyV1Magic string = "openssh-key-v1"
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)
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// Defaults.
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const (
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defCipher string = CipherAes256Ctr
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defKeyType string = KeyEd25519
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defKDF string = KdfBcrypt
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defRounds uint32 = 100
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defRSABitSize uint32 = 4096
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defSaltLen int = 16
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// bcrypt_pbkdf maxes out at 32 for private key gen (sk is actually 64; sk+pk)
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// But per OpenSSH code, we pass a key len of kdfKeyLen + len(salt)
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kdfKeyLen int = 32
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kdfSplit int = 32
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)
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// Cipher names. I believe only AES256-CTR is supported upstream currently.
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const (
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CipherNull string = "none"
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CipherAes256Ctr string = "aes256-ctr"
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)
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var allowedCiphers = [...]string{CipherNull, CipherAes256Ctr}
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// Key types.
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const (
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KeyEd25519 string = "ssh-ed25519"
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KeyRsa string = "ssh-rsa"
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)
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var allowedKeytypes = [...]string{KeyEd25519, KeyRsa}
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// KDF names. I believe only bcrypt is supported upstream currently.
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const (
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KdfNull string = "none"
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KdfBcrypt string = "bcrypt"
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)
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var allowedKdfnames = [...]string{KdfNull, KdfBcrypt}
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// Key lengths.
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const (
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// ED25519 in OpenSSH uses a static key size of 64 bytes.
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ed25519Len uint32 = 64
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)
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// Key/Block sizes.
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const (
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keyEd25519 uint32 = 32
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// Is this correct? Based on PROTOCOL.key's "padlen % 255", it seems to be.
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blockPad uint32 = 255
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blockEd25519 uint32 = 16
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// Blocksize for RSA depends on key bits, I think.
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blockNull uint32 = 8
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)
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