miracle091/Picocrypt
miracle091/Picocrypt
1
0
Fork 0
mirror of https://github.com/HACKERALERT/Picocrypt.git synced 2024-12-28 00:10:13 +01:00
Code Releases Activity

Add header table

Browse Source
This commit is contained in:
Evan Su 2022-04-02 21:05:18 -04:00 committed by GitHub
parent 9b36972c78
commit daa700ed61
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
Internals.md
View File

@ -22,4 +22,20 @@ If "Require correct order" is not checked, Picocrypt will take the SHA3 hash of
If "Require correct order" is checked, Picocrypt will combine (concatenate) the files together in the order they were dropped into the window, and take the SHA3 hash of the combined keyfiles. If the order is not correct, the keyfiles, when appended to each other, will result in a different file, and therefore a different hash. Thus, the correct order of keyfiles is required to successfully decrypt the volume.
# Header Format
Work in progress...
A Picocrypt volume's header is encoded with Reed-Solomon by default, since it is, after all, the most important part of the entire file. An encoded value will take up three times the size of the unencoded value.
**All offsets and sizes below are in bytes.**
| Offset | Encoded size | Decoded size | Description
| ------ | ------------ | ------------ | -----------
| 0 | 15 | 5 | Version number (ex. "v1.15")
| 15 | 15 | 5 | Length of comments, padded to 5 bytes
| 30 | 3C | C | Comments with a length of C characters
| 30+3C | 15 | 5 | Flags (paranoid mode, use keyfiles, etc.)
| 45+3C | 48 | 16 | Salt for Argon2
| 93+3C | 96 | 32 | Salt for HKDF-SHA3
| 189+3C | 48 | 16 | Salt for Serpent
| 237+3C | 72 | 24 | Nonce for XChaCha20
| 309+3C | 192 | 64 | SHA3-512 of encryption key
| 501+3C | 96 | 32 | Hash of keyfile key
| 597+3C | 192 | 64 | Message authentication code (BLAKE2b/HMAC-SHA3)
| 789+3C | | | Encrypted contents of input data