99 lines
4.0 KiB
Plaintext
99 lines
4.0 KiB
Plaintext
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===== v1 (Plain)
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[TIP]
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====
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Since plaintext/unencrypted keys do not have a cipher or KDF (as there's no encryption key or algorithm used), they use the string "none" to identify these (and entirely leave out the KDF options).
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====
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[id=struct_ed25519_plain]
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====== Structure
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[source,text,linenums]
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----
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0.0 "openssh-key-v1" string plus terminating nullbyte (15 bytes)
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1.0 uint32 allocator for 1.0.0 (4 bytes)
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1.0.0 cipher name string (ASCII bytes)
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2.0 uint32 allocator for 2.0.0 (4 bytes)
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2.0.0 KDF name string (ASCII bytes)
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3.0 uint32 allocator for KDF options (3.0.0 to 3.0.1) (4 bytes) (ALWAYS 0 for unencrypted keys, so no following substructure)
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4.0 uint32 counter for # of keys (4 bytes)
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4.0.0 uint32 allocator for public key #n (4.0.0.0 to 4.0.0.1) (4 bytes)
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4.0.0.0 uint32 allocator for 4.0.0.0.0 (4 bytes)
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4.0.0.0.0 public key #n keytype string (ASCII bytes)
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4.0.0.1 uint32 allocator for 4.0.0.1.0 (4 bytes)
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4.0.0.1.0 public key #n payload (bytes)
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4.0.1 uint32 allocator for private key structure #n (4.0.1.0 to 4.0.1.5) (4 bytes)
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4.0.1.0 uint32 decryption "checksum" #1 (should match 4.0.1.1) (4 bytes)
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4.0.1.1 uint32 decryption "checksum" #2 (should match 4.0.1.0) (4 bytes)
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4.0.1.2 Copy of 4.0.0.0; allocator for 4.0.1.2.0 (4 bytes)
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4.0.1.2.0 Copy of 4.0.0.0.0 (ASCII bytes)
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4.0.1.3 Copy of 4.0.0.1; allocator for 4.0.1.3.0 (4 bytes)
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4.0.1.3.0 Copy of 4.0.0.1.0 (bytes)
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4.0.1.4 uint32 allocator for 4.0.1.4.0 (4 bytes)
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4.0.1.4.0 Private key #n (bytes)
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4.0.1.5 uint32 allocator for 4.0.1.5.0 (4 bytes)
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4.0.1.5.0 comment for key #n string (ASCII bytes)
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4.0.1.6 sequential padding
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----
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[NOTE]
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====
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*Chunk 3.0.0 to 3.0.1:* These blocks are not present in unencrypted keys (see the <<struct_ed25519_crypt, encrypted key structure>> for what these look like). *3.0* reflects this, as it's always going to be `00000000` (0).
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*Chunk 4.0:* This is technically currently unused; upstream hardcodes to 1 (left zero-padded `0x01`).
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*Chunk 4.0.1.4.0:* This is a 64-byte block for ED25519, but the second half of the private key (`[32:]`) is always the same as the public key.
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*Chunk 4.0.1.6:* The padding used aligns the private key (*4.0.1.0* to *4.0.1.5.0*) to the cipher blocksize. For plaintext keys, a blocksize of 8 is used.
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====
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[id=bytes_ed25519_plain]
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====== Example
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.`id_ed25519` Format
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[source,text,linenums]
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----
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-----BEGIN OPENSSH PRIVATE KEY-----
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b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
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QyNTUxOQAAACBEOIvJc2hN1mhXExEiv/ISyYO7prFixOl80R9zw52XsAAAAJjPbUqwz21K
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sAAAAAtzc2gtZWQyNTUxOQAAACBEOIvJc2hN1mhXExEiv/ISyYO7prFixOl80R9zw52XsA
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AAAEBqSF+KwoLTOqI6+TnpcaZY4ckcamLrBF8CvtJbNZflJ0Q4i8lzaE3WaFcTESK/8hLJ
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g7umsWLE6XzRH3PDnZewAAAAElRoaXMgaXMgYSB0ZXN0IGtleQECAw==
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-----END OPENSSH PRIVATE KEY-----
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----
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.Structure Reference (Hex) (Decoded Base64)
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[source,text,linenums]
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----
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0.0 6f70656e7373682d6b65792d763100 ("openssh-key-v1" + 0x00)
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1.0 00000004 (4)
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1.0.0 6e6f6e65 ("none")
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2.0 00000004
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2.0.0 6e6f6e65 ("none")
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3.0 00000000 (0)
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4.0 00000001 (1)
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4.0.0 00000033 (51)
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4.0.0.0 0000000b (11)
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4.0.0.0.0 7373682d65643235353139 ("ssh-ed25519")
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4.0.0.1 00000020 (32)
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4.0.0.1.0 44388bc973684dd66857131122bff212
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c983bba6b162c4e97cd11f73c39d97b0 (bytes)
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4.0.1 00000098 (141)
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4.0.1.0 cf6d4ab0 (3480046256)
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4.0.1.1 cf6d4ab0 (3480046256)
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4.0.1.2 0000000b (11)
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4.0.1.2.0 7373682d65643235353139 ("ssh-ed25519")
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4.0.1.3 00000020 (32)
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4.0.1.3.0 44388bc973684dd66857131122bff212
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c983bba6b162c4e97cd11f73c39d97b0 (bytes)
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4.0.1.4 00000040 (64)
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4.0.1.4.0 6a485f8ac282d33aa23af939e971a658
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e1c91c6a62eb045f02bed25b3597e527
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44388bc973684dd66857131122bff212
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c983bba6b162c4e97cd11f73c39d97b0 (bytes)
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4.0.1.5 00000012 (18)
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4.0.1.5.0 5468697320697320612074657374206b6579 ("This is a test key")
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4.0.1.6 010203 ([1 2 3], 3 bytes)
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----
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