47 lines
991 B
Go
47 lines
991 B
Go
package lbrycrd
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import (
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"crypto/sha256"
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"encoding/binary"
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"encoding/hex"
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"golang.org/x/crypto/ripemd160"
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)
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// rev reverses a byte slice. useful for switching endian-ness
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func rev(b []byte) []byte {
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r := make([]byte, len(b))
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for left, right := 0, len(b)-1; left < right; left, right = left+1, right-1 {
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r[left], r[right] = b[right], b[left]
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}
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return r
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}
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func ClaimIDFromOutpoint(txid string, nout int) (string, error) {
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// convert transaction id to byte array
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txidBytes, err := hex.DecodeString(txid)
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if err != nil {
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return "", err
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}
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// reverse (make big-endian)
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txidBytes = rev(txidBytes)
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// append nout
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noutBytes := make([]byte, 4) // num bytes in uint32
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binary.BigEndian.PutUint32(noutBytes, uint32(nout))
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txidBytes = append(txidBytes, noutBytes...)
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// sha256 it
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s := sha256.New()
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s.Write(txidBytes)
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// ripemd it
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r := ripemd160.New()
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r.Write(s.Sum(nil))
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// reverse (make little-endian)
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res := rev(r.Sum(nil))
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return hex.EncodeToString(res), nil
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}
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