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txscript: Slight crypto hash optimizations.

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This commit very slightly optimizes the cryptographic hashing performed
by the script opcodes by calling the hash sum routines directly (for
those that support it) rather than allocating a new generic hash.Hash
hasher instance for them.
This commit is contained in:
Dave Collins 2015-04-27 12:32:32 -05:00
parent 7411e65b1e
commit c701477eaf
1 changed files with 6 additions and 8 deletions
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14
txscript/opcode.go
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@ -1482,11 +1482,6 @@ func calcHash(buf []byte, hasher hash.Hash) []byte {
return hasher.Sum(nil)
}
// calculate hash160 which is ripemd160(sha256(data))
func calcHash160(buf []byte) []byte {
return calcHash(calcHash(buf, fastsha256.New()), ripemd160.New())
}
func opcodeRipemd160(op *parsedOpcode, vm *Engine) error {
buf, err := vm.dstack.PopByteArray()
if err != nil {
@ -1503,7 +1498,8 @@ func opcodeSha1(op *parsedOpcode, vm *Engine) error {
return err
}
vm.dstack.PushByteArray(calcHash(buf, sha1.New()))
hash := sha1.Sum(buf)
vm.dstack.PushByteArray(hash[:])
return nil
}
@ -1513,7 +1509,8 @@ func opcodeSha256(op *parsedOpcode, vm *Engine) error {
return err
}
vm.dstack.PushByteArray(calcHash(buf, fastsha256.New()))
hash := fastsha256.Sum256(buf)
vm.dstack.PushByteArray(hash[:])
return nil
}
@ -1523,7 +1520,8 @@ func opcodeHash160(op *parsedOpcode, vm *Engine) error {
return err
}
vm.dstack.PushByteArray(calcHash160(buf))
hash := fastsha256.Sum256(buf)
vm.dstack.PushByteArray(calcHash(hash[:], ripemd160.New()))
return nil
}