SLIP-0027: Variable-length keys for cryptographic schemes - #2017
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| * *retry* is a single byte, 0 ≤ *retry* ≤ 255. | ||
| * *length* is the desired output length in bytes, an integer with 1 ≤ *length* ≤ 16384. | ||
| * The block index is encoded as a single byte. The two-byte HMAC message *retry* || *block* is the byte *retry* followed by the byte *block*. | ||
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I think we should highlight the importance of not using the Key(N) of a node as a keying material and using the same node as an input for the Expand function.
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| **Warning:** Never use `Key(N)` as output keying material and the same node *N* as input to `Expand`. | |
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