33 lines
684 B
Go
33 lines
684 B
Go
package checksum
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import (
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"bytes"
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"encoding/binary"
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"github.com/CityOfZion/neo-go/pkg/crypto/hash"
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)
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// Compare calculates the checksum of b
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// then compares it with the `have` checksum passed as a parameter
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func Compare(have uint32, b []byte) bool {
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want := FromBytes(b)
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return have == want
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}
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// FromBuf calculates the checksum of a buffer
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func FromBuf(buf *bytes.Buffer) uint32 {
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return FromBytes(buf.Bytes())
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}
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// FromBytes calculates the checksum of a byte slice
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func FromBytes(buf []byte) uint32 {
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b, err := hash.DoubleSha256(buf)
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if err != nil {
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return 0
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}
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// checksum := SumSHA256(SumSHA256(buf.Bytes()))
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return binary.LittleEndian.Uint32(b.Bytes()[:4])
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}
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