| 7-Zip method IDs (9.24) | |
| ----------------------- | |
| 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: | |
| 3F ZZ ZZ ZZ ZZ ZZ MM MM | |
| 3F - 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 | |
| 03 - Delta | |
| 04 - x86 (BCJ) | |
| 05 - PPC (Big Endian) | |
| 06 - IA64 | |
| 07 - ARM (little endian) | |
| 08 - ARM Thumb (little endian) | |
| 09 - SPARC | |
| 21 - LZMA2 | |
| 02.. - Common | |
| 03 Swap | |
| - 2 Swap2 | |
| - 4 Swap4 | |
| 03.. - 7z | |
| 01 - LZMA | |
| 01 - Version | |
| 03 - Branch | |
| 01 - x86 | |
| 03 - BCJ | |
| 1B - BCJ2 | |
| 02 - PPC | |
| 05 - PPC (Big Endian) | |
| 03 - Alpha | |
| 01 - Alpha | |
| 04 - IA64 | |
| 01 - IA64 | |
| 05 - ARM | |
| 01 - ARM | |
| 06 - M68 | |
| 05 - M68 (Big Endian) | |
| 07 - ARM Thumb | |
| 01 - ARMT | |
| 08 - SPARC | |
| 05 - SPARC | |
| 04 - PPMD | |
| 01 - Version | |
| 7F - | |
| 01 - experimental methods. | |
| 04.. - Misc | |
| 00 - Reserved | |
| 01 - Zip | |
| 00 - Copy (not used). Use {00} instead | |
| 01 - Shrink | |
| 06 - Implode | |
| 08 - Deflate | |
| 09 - Deflate64 | |
| 10 - Imploding | |
| 12 - BZip2 (not used). Use {04 02 02} instead | |
| 14 - LZMA | |
| 60 - Jpeg | |
| 61 - WavPack | |
| 62 - PPMd | |
| 63 - wzAES | |
| 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 | |
| F0 - Ciphers without hashing algo | |
| 01 - AES | |
| 0x - AES-128 | |
| 4x - AES-192 | |
| 8x - AES-256 | |
| Cx - AES | |
| x0 - ECB | |
| x1 - CBC | |
| x2 - CFB | |
| x3 - OFB | |
| x4 - CTR | |
| F1 - Combine Ciphers | |
| 01 - Zip | |
| 01 - Main Zip crypto algo | |
| 03 - RAR | |
| 02 - | |
| 03 - Rar29 AES-128 + (modified SHA-1) | |
| 07 - 7z | |
| 01 - AES-256 + SHA-256 | |
| --- | |
| End of document |