1 7-Zip method IDs (4.56) |
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2 ----------------------- |
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3 |
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4 Each compression or crypto method in 7z has unique binary value (ID). |
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5 The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). |
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6 |
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7 If you want to add some new ID, you have two ways: |
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8 1) Write request for allocating IDs to 7-zip developers. |
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9 2) Generate 8-bytes ID: |
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10 |
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11 7F ZZ ZZ ZZ ZZ ZZ MM MM |
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12 |
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13 7F - Prefix for random IDs (1 byte) |
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14 ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes. |
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15 |
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16 MM MM - Method ID (2 bytes) |
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17 |
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18 You can notify 7-Zip developers about your Developer ID / Method ID. |
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19 |
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20 Note: Use new ID only if old codec can not decode data encoded with new version. |
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21 |
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22 |
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23 List of defined IDs |
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24 ------------------- |
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25 |
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26 00 - Copy |
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27 01 - Reserved |
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28 02 - Common |
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29 03 Swap |
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30 - 2 Swap2 |
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31 - 4 Swap4 |
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32 04 Delta (subject to change) |
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33 |
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34 03 - 7z |
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35 01 - LZMA |
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36 01 - Version |
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37 |
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38 03 - Branch |
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39 01 - x86 |
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40 03 - BCJ |
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41 1B - BCJ2 |
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42 02 - PPC |
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43 05 - BC_PPC_B (Big Endian) |
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44 03 - Alpha |
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45 01 - BC_Alpha |
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46 04 - IA64 |
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47 01 - BC_IA64 |
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48 05 - ARM |
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49 01 - BC_ARM |
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50 06 - M68 |
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51 05 - BC_M68_B (Big Endian) |
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52 07 - ARM Thumb |
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53 01 - BC_ARMThumb |
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54 08 - SPARC |
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55 05 - BC_SPARC |
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56 |
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57 04 - PPMD |
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58 01 - Version |
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59 |
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60 7F - |
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61 01 - experimental methods. |
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62 |
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63 80 - reserved for independent developers |
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64 |
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65 E0 - Random IDs |
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66 |
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67 04 - Misc |
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68 00 - Reserved |
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69 01 - Zip |
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70 00 - Copy (not used). Use {00} instead |
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71 01 - Shrink |
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72 06 - Implode |
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73 08 - Deflate |
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74 09 - Deflate64 |
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75 12 - BZip2 (not used). Use {04 02 02} instead |
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76 02 - BZip |
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77 02 - BZip2 |
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78 03 - Rar |
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79 01 - Rar15 |
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80 02 - Rar20 |
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81 03 - Rar29 |
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82 04 - Arj |
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83 01 - Arj (1,2,3) |
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84 02 - Arj 4 |
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85 05 - Z |
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86 06 - Lzh |
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87 07 - Reserved for 7z |
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88 08 - Cab |
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89 09 - NSIS |
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90 01 - DeflateNSIS |
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91 02 - BZip2NSIS |
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92 |
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93 |
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94 06 - Crypto |
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95 00 - |
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96 01 - AES |
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97 0x - AES-128 |
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98 4x - AES-192 |
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99 8x - AES-256 |
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100 Cx - AES |
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101 |
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102 x0 - ECB |
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103 x1 - CBC |
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104 x2 - CFB |
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105 x3 - OFB |
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106 |
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107 07 - Reserved |
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108 0F - Reserved |
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109 |
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110 F0 - Misc Ciphers (Real Ciphers without hashing algo) |
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111 |
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112 F1 - Misc Ciphers (Combine) |
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113 01 - Zip |
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114 01 - Main Zip crypto algo |
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115 03 - RAR |
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116 02 - |
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117 03 - Rar29 AES-128 + (modified SHA-1) |
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118 07 - 7z |
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119 01 - AES-256 + SHA-256 |
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120 |
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121 07 - Hash (subject to change) |
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122 00 - |
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123 01 - CRC |
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124 02 - SHA-1 |
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125 03 - SHA-256 |
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126 04 - SHA-384 |
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127 05 - SHA-512 |
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128 |
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129 F0 - Misc Hash |
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130 |
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131 F1 - Misc |
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132 03 - RAR |
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133 03 - Rar29 Password Hashing (modified SHA1) |
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134 07 - 7z |
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135 01 - SHA-256 Password Hashing |
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136 |
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137 |
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138 |
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139 |
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140 --- |
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141 End of document |
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