61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
package address
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import (
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"errors"
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"crypto/sha256"
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)
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const pubkey_prefix = byte(85)
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const script_prefix = byte(122)
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const prefix_length = 1
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const pubkey_length = 20
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const checksum_length = 4
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const address_length = prefix_length + pubkey_length + checksum_length
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var address_prefixes = [2]byte {pubkey_prefix, script_prefix}
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func PrefixIsValid(address [address_length]byte) bool {
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prefix := address[0]
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for _, addr_prefix := range address_prefixes {
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if addr_prefix == prefix {
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return true
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}
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}
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return false
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}
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func PubKeyIsValid(address [address_length]byte) bool {
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pubkey := address[prefix_length:pubkey_length+prefix_length]
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// TODO: validate this for real
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if len(pubkey) != pubkey_length {
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return false
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}
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return true
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}
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func ChecksumIsValid(address [address_length]byte) bool {
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checksum := [checksum_length]byte{}
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for i := range checksum {checksum[i] = address[prefix_length+pubkey_length+i]}
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real_checksum := sha256.Sum256(address[:prefix_length+pubkey_length])
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real_checksum = sha256.Sum256(real_checksum[:])
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for i, c := range checksum {
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if c != real_checksum[i] {
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return false
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}
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}
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return true
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}
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func ValidateAddress(address [address_length]byte) ([address_length]byte, error) {
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if !PrefixIsValid(address) {
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return address, errors.New("invalid prefix")
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}
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if !PubKeyIsValid(address) {
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return address, errors.New("invalid pubkey")
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}
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if !ChecksumIsValid(address) {
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return address, errors.New("invalid address checksum")
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}
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return address, nil
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}
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