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Expose MnemonicCode.toEntropy() and MnemonicCode.toEntropyWithChecksum() methods (#3786)

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Chris Stewart 2021-10-29 19:34:42 -05:00 committed by GitHub
parent ee348c8a57
commit 92cf042ccb
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1 changed files with 20 additions and 19 deletions
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39
core/src/main/scala/org/bitcoins/core/crypto/MnemonicCode.scala
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@ -26,26 +26,10 @@ sealed abstract class MnemonicCode
require({
val entropy = toEntropyWithChecksum
isEntropyWithChecksumValid(entropy)
MnemonicCode.isEntropyWithChecksumValid(entropy, words)
},
"Entropy checksum is not valid!")
/** Checks that the provided entropy has a valid checksum
* attached at the end
*/
private[crypto] def isEntropyWithChecksumValid(
entropyWithChecksum: BitVector): Boolean = {
val codeInfo = MnemonicCode.getMnemonicCodeInfo(words)
val entropyNoChecksum = entropyWithChecksum.take(codeInfo.entropyBits)
val hashedEntropy = CryptoUtil.sha256(entropyNoChecksum).bytes.toBitVector
val checksum = hashedEntropy.take(codeInfo.checksumLength)
entropyNoChecksum ++ checksum == entropyWithChecksum
}
/** The mnemonic code itself
*/
def words: Vector[String]
@ -55,7 +39,7 @@ sealed abstract class MnemonicCode
/** Returns the entropy initially provided to construct
* this mnemonic code
*/
private[bitcoins] def toEntropy: BitVector = {
def toEntropy: BitVector = {
val entropyWithChecksumBits = toEntropyWithChecksum
val lengthNoEntropy = MnemonicCode
.getMnemonicCodeInfo(words)
@ -67,7 +51,7 @@ sealed abstract class MnemonicCode
/** Returns the entropy _with checksum_ originally provided
* to construct this mnemonic code
*/
private[crypto] def toEntropyWithChecksum: BitVector = {
def toEntropyWithChecksum: BitVector = {
def bitsForWord(word: String): BitVector = {
@ -248,4 +232,21 @@ object MnemonicCode {
private[crypto] lazy val ENGLISH_WORDS: Vector[String] = {
EnglishWordsBip39.getWords
}.ensuring(words => words.length == 2048, "Word list must be 2048 words long")
/** Checks that the provided entropy has a valid checksum
* attached at the end
*/
def isEntropyWithChecksumValid(
entropyWithChecksum: BitVector,
words: Vector[String]): Boolean = {
val codeInfo = MnemonicCode.getMnemonicCodeInfo(words)
val entropyNoChecksum = entropyWithChecksum.take(codeInfo.entropyBits)
val hashedEntropy = CryptoUtil.sha256(entropyNoChecksum).bytes.toBitVector
val checksum = hashedEntropy.take(codeInfo.checksumLength)
entropyNoChecksum ++ checksum == entropyWithChecksum
}
}