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https://github.com/kaspanet/kaspad.git
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45edacfbfa
* Replace default hasher (Double-SHA256) with domain seperated blake2b * Replace all hashes with domain seperated blake2b * Update the genesis blocks * Replace OP_HASH256 with OP_BLAKE2B * Fix the merkle tree by appending zeros instead of duplicating the hash when there is 1 branch left * Update tests * Add a payloadHash function * Update gitignore to ignore binaries * Fix a bug in the blake2b opcode
33 lines
1.1 KiB
Go
33 lines
1.1 KiB
Go
package hashes
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import (
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"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
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"github.com/pkg/errors"
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"hash"
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)
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// HashWriter is used to incrementally hash data without concatenating all of the data to a single buffer
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// it exposes an io.Writer api and a Finalize function to get the resulting hash.
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// The used hash function is blake2b.
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// This can only be created via one of the domain separated constructors
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type HashWriter struct {
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hash.Hash
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}
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// InfallibleWrite is just like write but doesn't return anything
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func (h HashWriter) InfallibleWrite(p []byte) {
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// This write can never return an error, this is part of the hash.Hash interface contract.
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_, err := h.Write(p)
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if err != nil {
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panic(errors.Wrap(err, "this should never happen. hash.Hash interface promises to not return errors."))
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}
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}
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// Finalize returns the resulting hash
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func (h HashWriter) Finalize() *externalapi.DomainHash {
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var sum externalapi.DomainHash
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// This should prevent `Sum` for allocating an output buffer, by using the DomainHash buffer. we still copy because we don't want to rely on that.
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copy(sum[:], h.Sum(sum[:0]))
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return &sum
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}
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