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- 7-Zip method IDs (4.56)
- -----------------------
- Each compression or crypto method in 7z has unique binary value (ID).
- The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes).
- If you want to add some new ID, you have two ways:
- 1) Write request for allocating IDs to 7-zip developers.
- 2) Generate 8-bytes ID:
- 7F ZZ ZZ ZZ ZZ ZZ MM MM
- 7F - Prefix for random IDs (1 byte)
- ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes.
-
- MM MM - Method ID (2 bytes)
- You can notify 7-Zip developers about your Developer ID / Method ID.
- Note: Use new ID only if old codec can not decode data encoded with new version.
- List of defined IDs
- -------------------
-
- 00 - Copy
- 01 - Reserved
- 02 - Common
- 03 Swap
- - 2 Swap2
- - 4 Swap4
- 04 Delta (subject to change)
- 03 - 7z
- 01 - LZMA
- 01 - Version
-
- 03 - Branch
- 01 - x86
- 03 - BCJ
- 1B - BCJ2
- 02 - PPC
- 05 - BC_PPC_B (Big Endian)
- 03 - Alpha
- 01 - BC_Alpha
- 04 - IA64
- 01 - BC_IA64
- 05 - ARM
- 01 - BC_ARM
- 06 - M68
- 05 - BC_M68_B (Big Endian)
- 07 - ARM Thumb
- 01 - BC_ARMThumb
- 08 - SPARC
- 05 - BC_SPARC
- 04 - PPMD
- 01 - Version
- 7F -
- 01 - experimental methods.
- 80 - reserved for independent developers
- E0 - Random IDs
- 04 - Misc
- 00 - Reserved
- 01 - Zip
- 00 - Copy (not used). Use {00} instead
- 01 - Shrink
- 06 - Implode
- 08 - Deflate
- 09 - Deflate64
- 12 - BZip2 (not used). Use {04 02 02} instead
- 02 - BZip
- 02 - BZip2
- 03 - Rar
- 01 - Rar15
- 02 - Rar20
- 03 - Rar29
- 04 - Arj
- 01 - Arj (1,2,3)
- 02 - Arj 4
- 05 - Z
- 06 - Lzh
- 07 - Reserved for 7z
- 08 - Cab
- 09 - NSIS
- 01 - DeflateNSIS
- 02 - BZip2NSIS
- 06 - Crypto
- 00 -
- 01 - AES
- 0x - AES-128
- 4x - AES-192
- 8x - AES-256
- Cx - AES
- x0 - ECB
- x1 - CBC
- x2 - CFB
- x3 - OFB
- 07 - Reserved
- 0F - Reserved
- F0 - Misc Ciphers (Real Ciphers without hashing algo)
- F1 - Misc Ciphers (Combine)
- 01 - Zip
- 01 - Main Zip crypto algo
- 03 - RAR
- 02 -
- 03 - Rar29 AES-128 + (modified SHA-1)
- 07 - 7z
- 01 - AES-256 + SHA-256
- 07 - Hash (subject to change)
- 00 -
- 01 - CRC
- 02 - SHA-1
- 03 - SHA-256
- 04 - SHA-384
- 05 - SHA-512
- F0 - Misc Hash
- F1 - Misc
- 03 - RAR
- 03 - Rar29 Password Hashing (modified SHA1)
- 07 - 7z
- 01 - SHA-256 Password Hashing
-
-
- ---
- End of document
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