| 7-Zip method IDs for 7z and xz archives | |
| --------------------------------------- | |
| Version: 16.03 | |
| Date: 2016-09-27 | |
| Each compression or crypto method in 7z is associated with unique binary value (ID). | |
| The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). | |
| xz and 7z formats use same ID map. | |
| 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, if old codec can not decode data encoded with new version. | |
| List of defined IDs | |
| ------------------- | |
| 00 - Copy | |
| 03 - Delta | |
| 04 - BCJ (x86) | |
| 05 - PPC (big-endian) | |
| 06 - IA64 | |
| 07 - ARM (little-endian) | |
| 08 - ARMT (little-endian) | |
| 09 - SPARC | |
| 21 - LZMA2 | |
| 02.. - Common | |
| 03 [Swap] | |
| - 2 Swap2 | |
| - 4 Swap4 | |
| 03.. - 7z | |
| 01 - | |
| 01 - LZMA | |
| 03 - [Branch Codecs] | |
| 01 - [x86 Codecs] | |
| 03 - BCJ | |
| 1B - BCJ2 (4 packed streams) | |
| 02 - | |
| 05 - PPC (big-endian) | |
| 03 - | |
| 01 - Alpha | |
| 04 - | |
| 01 - IA64 | |
| 05 - | |
| 01 - ARM (little-endian) | |
| 06 - | |
| 05 - M68 (big-endian) | |
| 07 - | |
| 01 - ARMT (little-endian) | |
| 08 - | |
| 05 - SPARC | |
| 04 - | |
| 01 - PPMD | |
| 7F - | |
| 01 - experimental method. | |
| 04.. - Misc codecs | |
| 00 - Reserved | |
| 01 - [Zip] | |
| 00 - Copy (not used. Use {00} instead) | |
| 01 - Shrink | |
| 06 - Implode | |
| 08 - Deflate | |
| 09 - Deflate64 | |
| 0A - Imploding | |
| 0C - BZip2 (not used. Use {040202} instead) | |
| 0E - LZMA (LZMA-zip) | |
| 5F - xz | |
| 60 - Jpeg | |
| 61 - WavPack | |
| 62 - PPMd (PPMd-zip) | |
| 63 - wzAES | |
| 02 - | |
| 02 - BZip2 | |
| 03 - [Rar] | |
| 01 - Rar1 | |
| 02 - Rar2 | |
| 03 - Rar3 | |
| 05 - Rar5 | |
| 04 - [Arj] | |
| 01 - Arj(1,2,3) | |
| 02 - Arj4 | |
| 05 - [Z] | |
| 06 - [Lzh] | |
| 07 - Reserved for 7z | |
| 08 - [Cab] | |
| 09 - [NSIS] | |
| 01 - DeflateNSIS | |
| 02 - BZip2NSIS | |
| F7 - External codecs (that are not included to 7-Zip) | |
| 0x xx - reserved | |
| 10 xx - reserved (LZHAM) | |
| 11 xx - reserved (Zstd) | |
| 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 - ZipCrypto (Main Zip crypto algo) | |
| 03 - [RAR] | |
| 02 - | |
| 03 - Rar29AES (AES-128 + modified SHA-1) | |
| 07 - [7z] | |
| 01 - 7zAES (AES-256 + SHA-256) | |
| --- | |
| End of document |