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btcutil/bech32: Added DecodeNoLimitWithVersion

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This exposes publicly the ability to decode arbitrary-length bech32
strings and return the bech32 version that was used in the encoding. It
provides the underlying functionality for both DecodeNoLimit and
DecodeGeneric.
This commit is contained in:
marcoezekiel 2024-05-09 11:24:30 -06:00
parent 6b197d38d7
commit 2492b01f69
1 changed files with 11 additions and 8 deletions
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19
btcutil/bech32/bech32.go
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@ -165,11 +165,14 @@ func bech32VerifyChecksum(hrp string, data []byte) (Version, bool) {
return VersionUnknown, false
}
// DecodeNoLimit is a bech32 checksum version aware arbitrary string length
// decoder. This function will return the version of the decoded checksum
// constant so higher level validation can be performed to ensure the correct
// version of bech32 was used when encoding.
func decodeNoLimit(bech string) (string, []byte, Version, error) {
// DecodeNoLimitWithVersion is a bech32 checksum version aware arbitrary string
// length decoder. This function will return the version of the decoded
// checksum constant so higher level validation can be performed to ensure the
// correct version of bech32 was used when encoding.
//
// Note that the returned data is 5-bit (base32) encoded and the human-readable
// part will be lowercase.
func DecodeNoLimitWithVersion(bech string) (string, []byte, Version, error) {
// The minimum allowed size of a bech32 string is 8 characters, since it
// needs a non-empty HRP, a separator, and a 6 character checksum.
if len(bech) < 8 {
@ -262,7 +265,7 @@ func decodeNoLimit(bech string) (string, []byte, Version, error) {
// Note that the returned data is 5-bit (base32) encoded and the human-readable
// part will be lowercase.
func DecodeNoLimit(bech string) (string, []byte, error) {
hrp, data, _, err := decodeNoLimit(bech)
hrp, data, _, err := DecodeNoLimitWithVersion(bech)
return hrp, data, err
}
@ -277,7 +280,7 @@ func Decode(bech string) (string, []byte, error) {
return "", nil, ErrInvalidLength(len(bech))
}
hrp, data, _, err := decodeNoLimit(bech)
hrp, data, _, err := DecodeNoLimitWithVersion(bech)
return hrp, data, err
}
@ -291,7 +294,7 @@ func DecodeGeneric(bech string) (string, []byte, Version, error) {
return "", nil, VersionUnknown, ErrInvalidLength(len(bech))
}
return decodeNoLimit(bech)
return DecodeNoLimitWithVersion(bech)
}
// encodeGeneric is the base bech32 encoding function that is aware of the