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a786cdc15e
* Add ECDSA support * Add domain separation to ECDSA sighash * Use InfallibleWrite instead of Write * Rename funcs * Fix wrong use if vm.sigCache * Add TestCalculateSignatureHashECDSA * Add consts * Fix comment and test name * Move consts to the top * Fix comment
84 lines
3.0 KiB
Go
84 lines
3.0 KiB
Go
package hashes
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import (
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"crypto/sha256"
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"github.com/pkg/errors"
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"golang.org/x/crypto/blake2b"
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)
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const (
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transcationHashDomain = "TransactionHash"
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transcationIDDomain = "TransactionID"
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transcationSigningDomain = "TransactionSigningHash"
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transcationSigningECDSADomain = "TransactionSigningHashECDSA"
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blockDomain = "BlockHash"
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proofOfWorkDomain = "ProofOfWorkHash"
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merkleBranchDomain = "MerkleBranchHash"
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)
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// transactionSigningECDSADomainHash is a hashed version of transcationSigningECDSADomain that is used
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// to make it a constant size. This is needed because this domain is used by sha256 hash writer, and
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// sha256 doesn't support variable size domain separation.
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var transactionSigningECDSADomainHash = sha256.Sum256([]byte(transcationSigningECDSADomain))
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// NewTransactionHashWriter Returns a new HashWriter used for transaction hashes
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func NewTransactionHashWriter() HashWriter {
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blake, err := blake2b.New256([]byte(transcationHashDomain))
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if err != nil {
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panic(errors.Wrapf(err, "this should never happen. %s is less than 64 bytes", transcationHashDomain))
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}
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return HashWriter{blake}
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}
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// NewTransactionIDWriter Returns a new HashWriter used for transaction IDs
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func NewTransactionIDWriter() HashWriter {
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blake, err := blake2b.New256([]byte(transcationIDDomain))
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if err != nil {
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panic(errors.Wrapf(err, "this should never happen. %s is less than 64 bytes", transcationIDDomain))
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}
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return HashWriter{blake}
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}
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// NewTransactionSigningHashWriter Returns a new HashWriter used for signing on a transaction
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func NewTransactionSigningHashWriter() HashWriter {
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blake, err := blake2b.New256([]byte(transcationSigningDomain))
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if err != nil {
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panic(errors.Wrapf(err, "this should never happen. %s is less than 64 bytes", transcationSigningDomain))
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}
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return HashWriter{blake}
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}
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// NewTransactionSigningHashECDSAWriter Returns a new HashWriter used for signing on a transaction with ECDSA
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func NewTransactionSigningHashECDSAWriter() HashWriter {
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hashWriter := HashWriter{sha256.New()}
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hashWriter.InfallibleWrite(transactionSigningECDSADomainHash[:])
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return hashWriter
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}
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// NewBlockHashWriter Returns a new HashWriter used for hashing blocks
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func NewBlockHashWriter() HashWriter {
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blake, err := blake2b.New256([]byte(blockDomain))
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if err != nil {
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panic(errors.Wrapf(err, "this should never happen. %s is less than 64 bytes", blockDomain))
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}
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return HashWriter{blake}
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}
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// NewPoWHashWriter Returns a new HashWriter used for the PoW function
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func NewPoWHashWriter() HashWriter {
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blake, err := blake2b.New256([]byte(proofOfWorkDomain))
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if err != nil {
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panic(errors.Wrapf(err, "this should never happen. %s is less than 64 bytes", proofOfWorkDomain))
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}
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return HashWriter{blake}
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}
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// NewMerkleBranchHashWriter Returns a new HashWriter used for a merkle tree branch
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func NewMerkleBranchHashWriter() HashWriter {
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blake, err := blake2b.New256([]byte(merkleBranchDomain))
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if err != nil {
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panic(errors.Wrapf(err, "this should never happen. %s is less than 64 bytes", merkleBranchDomain))
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}
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return HashWriter{blake}
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}
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