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| """ Helper functions used to calculate keys for Substrate storage items |
| """ |
|
|
| from hashlib import blake2b |
| import xxhash |
|
|
|
|
| def blake2_256(data): |
| """ |
| Helper function to calculate a 32 bytes Blake2b hash for provided data, used as key for Substrate storage items |
| |
| Parameters |
| ---------- |
| data |
| |
| Returns |
| ------- |
| |
| """ |
| return blake2b(data, digest_size=32).digest() |
|
|
|
|
| def blake2_128(data): |
| """ |
| Helper function to calculate a 16 bytes Blake2b hash for provided data, used as key for Substrate storage items |
| |
| Parameters |
| ---------- |
| data |
| |
| Returns |
| ------- |
| |
| """ |
| return blake2b(data, digest_size=16).digest() |
|
|
|
|
| def blake2_128_concat(data): |
| """ |
| Helper function to calculate a 16 bytes Blake2b hash for provided data, concatenated with data, used as key |
| for Substrate storage items |
| |
| Parameters |
| ---------- |
| data |
| |
| Returns |
| ------- |
| |
| """ |
| return blake2b(data, digest_size=16).digest() + data |
|
|
|
|
| def xxh128(data): |
| """ |
| Helper function to calculate a 2 concatenated xxh64 hash for provided data, used as key for several Substrate |
| |
| Parameters |
| ---------- |
| data |
| |
| Returns |
| ------- |
| |
| """ |
| storage_key1 = bytearray(xxhash.xxh64(data, seed=0).digest()) |
| storage_key1.reverse() |
|
|
| storage_key2 = bytearray(xxhash.xxh64(data, seed=1).digest()) |
| storage_key2.reverse() |
|
|
| return storage_key1 + storage_key2 |
|
|
|
|
| def two_x64_concat(data): |
| """ |
| Helper function to calculate a xxh64 hash with concatenated data for provided data, |
| used as key for several Substrate |
| |
| Parameters |
| ---------- |
| data |
| |
| Returns |
| ------- |
| |
| """ |
| storage_key = bytearray(xxhash.xxh64(data, seed=0).digest()) |
| storage_key.reverse() |
|
|
| return storage_key + data |
|
|
|
|
| def xxh64(data): |
| storage_key = bytearray(xxhash.xxh64(data, seed=0).digest()) |
| storage_key.reverse() |
|
|
| return storage_key |
|
|
|
|
| def identity(data): |
| return data |
|
|
