17-Zip method IDs for 7z and xz archives 2--------------------------------------- 3 4Version: 24.02 5Date: 2024-03-22 6 7Each compression or crypto method in 7z is associated with unique binary value (ID). 8The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). 9 10xz and 7z formats use same ID map. 11 12If you want to add some new ID, you have two ways: 13 1) Write request for allocating IDs to 7-Zip developers. 14 2) Generate 8-bytes ID: 15 16 3F ZZ ZZ ZZ ZZ ZZ MM MM 17 18 3F - Prefix for random IDs (1 byte) 19 ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes. 20 21 MM MM - Method ID (2 bytes) 22 23 You can notify 7-Zip developers about your Developer ID / Method ID. 24 25 Note: Use new ID, if old codec can not decode data encoded with new version. 26 27 28List of defined IDs 29------------------- 30 3100 - Copy 32 3303 - Delta 3404 - BCJ (x86) 3505 - PPC (big-endian) 3606 - IA64 3707 - ARM (little-endian) 3808 - ARMT (little-endian) 3909 - SPARC 400A - ARM64 410B - RISCV 42 4321 - LZMA2 44 4502.. - Common 46 03 [Swap] 47 - 2 Swap2 48 - 4 Swap4 49 5003.. - 7z 51 01 - 52 01 - LZMA 53 54 03 - [Branch Codecs] 55 01 - [x86 Codecs] 56 03 - BCJ 57 1B - BCJ2 (4 packed streams) 58 02 - 59 05 - PPC (big-endian) 60 03 - 61 01 - Alpha 62 04 - 63 01 - IA64 64 05 - 65 01 - ARM (little-endian) 66 06 - 67 05 - M68 (big-endian) 68 07 - 69 01 - ARMT (little-endian) 70 08 - 71 05 - SPARC 72 73 04 - 74 01 - PPMD 75 76 7F - 77 01 - experimental method. 78 79 8004.. - Misc codecs 81 82 00 - Reserved 83 84 01 - [Zip] 85 00 - Copy (not used. Use {00} instead) 86 01 - Shrink 87 06 - Implode 88 08 - Deflate 89 09 - Deflate64 90 0A - Imploding 91 0C - BZip2 (not used. Use {040202} instead) 92 0E - LZMA (LZMA-zip) 93 94 5D - ZSTD 95 5F - xz 96 60 - Jpeg 97 61 - WavPack 98 62 - PPMd (PPMd-zip) 99 63 - wzAES 100 101 02 - 102 02 - BZip2 103 104 03 - [Rar] 105 01 - Rar1 106 02 - Rar2 107 03 - Rar3 108 05 - Rar5 109 110 04 - [Arj] 111 01 - Arj(1,2,3) 112 02 - Arj4 113 114 05 - [Z] 115 116 06 - [Lzh] 117 118 07 - Reserved for 7z 119 120 08 - [Cab] 121 122 09 - [NSIS] 123 01 - DeflateNSIS 124 02 - BZip2NSIS 125 126 F7 - External codecs (that are not included to 7-Zip) 127 128 0x xx - reserved 129 130 10 xx - reserved (LZHAM) 131 01 - LZHAM 132 133 11 xx - reserved (Tino Reichardt) 134 01 - ZSTD 135 02 - BROTLI 136 04 - LZ4 137 05 - LZ5 138 06 - LIZARD 139 140 12 xx - reserverd (Denis Anisimov) 141 142 01 - WavPack2 143 FE - eSplitter 144 FF - RawSplitter 145 146 14706.. - Crypto 148 149 F0 - Ciphers without hashing algo 150 151 01 - [AES] 152 0x - AES-128 153 4x - AES-192 154 8x - AES-256 155 Cx - AES 156 157 x0 - ECB 158 x1 - CBC 159 x2 - CFB 160 x3 - OFB 161 x4 - CTR 162 163 F1 - Combine Ciphers 164 165 01 - [Zip] 166 01 - ZipCrypto (Main Zip crypto algo) 167 168 03 - [RAR] 169 02 - 170 03 - Rar29AES (AES-128 + modified SHA-1) 171 172 07 - [7z] 173 01 - 7zAES (AES-256 + SHA-256) 174 175 176--- 177End of document 178