DataHoarder
e9eb5915ed
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59 lines
2 KiB
Go
59 lines
2 KiB
Go
package crypto
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import (
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"encoding/binary"
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"git.gammaspectra.live/P2Pool/edwards25519"
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"git.gammaspectra.live/P2Pool/p2pool-observer/types"
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"git.gammaspectra.live/P2Pool/sha3"
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)
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func GetDerivationSharedDataForOutputIndex(derivation PublicKey, outputIndex uint64) PrivateKey {
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var k = derivation.AsBytes()
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var varIntBuf [binary.MaxVarintLen64]byte
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return PrivateKeyFromScalar(HashToScalar(k[:], varIntBuf[:binary.PutUvarint(varIntBuf[:], outputIndex)]))
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}
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var viewTagDomain = []byte("view_tag")
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func GetDerivationViewTagForOutputIndex(derivation PublicKey, outputIndex uint64) uint8 {
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var k = derivation.AsBytes()
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var varIntBuf [binary.MaxVarintLen64]byte
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return PooledKeccak256(viewTagDomain, k[:], varIntBuf[:binary.PutUvarint(varIntBuf[:], outputIndex)])[0]
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}
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func GetDerivationSharedDataAndViewTagForOutputIndex(derivation PublicKey, outputIndex uint64) (PrivateKey, uint8) {
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var k = derivation.AsBytes()
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var varIntBuf [binary.MaxVarintLen64]byte
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n := binary.PutUvarint(varIntBuf[:], outputIndex)
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pK := PrivateKeyFromScalar(HashToScalar(k[:], varIntBuf[:n]))
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return pK, PooledKeccak256(viewTagDomain, k[:], varIntBuf[:n])[0]
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}
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// GetDerivationSharedDataAndViewTagForOutputIndexNoAllocate Special version of GetDerivationSharedDataAndViewTagForOutputIndex
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func GetDerivationSharedDataAndViewTagForOutputIndexNoAllocate(k PublicKeyBytes, outputIndex uint64, hasher *sha3.HasherState) (edwards25519.Scalar, uint8) {
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var buf [PublicKeySize + binary.MaxVarintLen64]byte
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copy(buf[:], k[:])
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n := binary.PutUvarint(buf[PublicKeySize:], outputIndex)
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var h types.Hash
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hasher.Reset()
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_, _ = hasher.Write(buf[:PublicKeySize+n])
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HashFastSum(hasher, h[:])
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scReduce32(h[:])
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var c edwards25519.Scalar
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_, _ = c.SetCanonicalBytes(h[:])
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hasher.Reset()
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_, _ = hasher.Write(viewTagDomain)
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_, _ = hasher.Write(buf[:PublicKeySize+n])
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HashFastSum(hasher, h[:])
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return c, h[0]
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}
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func GetKeyImage(pair *KeyPair) PublicKey {
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return PublicKeyFromPoint(HashToPoint(pair.PublicKey)).Multiply(pair.PrivateKey.AsScalar())
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}
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