2020-09-18 18:01:16 -04:00
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#############################################################################
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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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2020-09-11 23:06:51 -04:00
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ANNOTATED HEX REFERENCE:
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PRIVATE:
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0 "openssh-key-v1" string plus terminating nullbyte
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1.0 uint32 allocator for 1.0.0
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1.0.0 cipher name (string) - if not encrypted (no passphrase), "none"
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2.0 uint32 allocator for 2.0.0
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2.0.0 KDF name (string) - if not encrypted (no passphrase), "none"
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3.0 uint32 allocator for 3.0.0 (nullbyte if unencrypted key)
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3.0.0 (virtual) KDF options. This is "missing" if it is an unencrypted key.
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3.0.0.0 uint32 allocator for 3.0.0.0.0
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3.0.0.0.0 Salt/IV (bytes)
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3.0.0.1 Number of rounds/"work factor" (uint32)
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4.0 uint32 allocator for # of keys (currently unused; hardcoded to 1 (left zero-padded 0x01))
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4.0.0 uint32 allocator for public key #1 (4.0.0.0 to 4.0.0.1, inclusive)
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4.0.0.0 uint32 allocator for 4.0.0.0.0
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4.0.0.0.0 public key #1 keytype (string)
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4.0.0.1 uint32 allocator for 4.0.0.1.0
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2020-09-17 15:29:09 -04:00
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4.0.0.1.0 public exponent ("e")
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4.0.0.2 uint32 allocator for 4.0.0.2.0
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4.0.0.2.0 modulus ("n")
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2020-09-11 23:06:51 -04:00
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4.0.1 uint32 allocator for private key #1 (4.0.1.0 to 4.0.1.5, inclusive?)[0]
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4.0.1.0 Checksum (random uint32) #1 (should match 4.0.1.1)
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4.0.1.1 Checksum (random uint32) #2 (should match 4.0.1.0)
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2020-09-17 15:29:09 -04:00
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4.0.1.2 (virtual) Copy of public key (with flipped e/n) (copy of 4.0.0.0 to 4.0.0.1, inclusive)
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2020-09-11 23:06:51 -04:00
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4.0.1.2.0 uint32 allocator for 4.0.1.2.0.0
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4.0.1.2.0.0 public key #1 keytype (string)
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4.0.1.2.1 uint32 allocator for 4.0.1.2.1.0
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2020-09-17 15:29:09 -04:00
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4.0.1.2.1.0 modulus ("n")
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4.0.1.2.2 uint32 allocator for 4.0.1.2.2.0
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4.0.1.2.2.0 public exponent ("e")
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2020-09-11 23:06:51 -04:00
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4.0.1.3 uint32 allocator for 4.0.1.3.0
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2020-09-17 15:29:09 -04:00
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4.0.1.3.0 private exponent ("d")
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4.0.1.4 uint32 allocator for 4.0.1.4.0
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4.0.1.4.0 CRT helper value ("q^(-1) mod p")
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4.0.1.5 uint32 allocator for 4.0.1.5.0
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4.0.1.5.0 prime #1 ("p")
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4.0.1.6 uint32 allocator for 4.0.1.6.0
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4.0.1.6.0 prime #2 ("q")
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4.0.1.7 uint32 allocator for 4.0.1.7.0
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4.0.1.7.0 Comment for key #1 (string)
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4.0.1.8 Sequential padding to align private key to cipher blocksize (8 for unencrypted keys?)[1].
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2020-09-11 23:06:51 -04:00
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2020-09-11 23:53:55 -04:00
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[0] If it is an encrypted key, everything below 4.0.1 is encrypted per 1.0.0, 2.0.0, and 3.0.0.
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2020-09-17 15:29:09 -04:00
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[1] Pad determined by ??
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2020-09-11 23:06:51 -04:00
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PUBLIC:
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2020-09-17 15:29:09 -04:00
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(Each .pub file's Base64 string contains 4.0.0.0 to 4.0.0.2 inclusive above)
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2020-09-11 23:06:51 -04:00
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0 uint32 allocator for 0.0
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2020-09-17 15:29:09 -04:00
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0.0 public key #1 keytype (string)
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2020-09-11 23:06:51 -04:00
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1 uint32 allocator for 1.0
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2020-09-17 15:29:09 -04:00
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1.0 public exponent ("e")
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2 uint32 allocator for 2.0
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2.0 modulus ("n")
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