Bitcoin/address validation: Difference between revisions
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(→{{header|Python}}: Provided error capturing for addresses that cannot be decoded using the decode_base58) |
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</pre> |
</pre> |
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=={{header|Scala}}== |
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<lang Scala>import java.security.MessageDigest |
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import java.util.Arrays.copyOfRange |
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import scala.annotation.tailrec |
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import scala.math.BigInt |
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object BitcoinAddressValidator extends App { |
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private def bitcoinTestHarness(address: String, expected: Boolean): Unit = |
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assert(validateBitcoinAddress(address) == expected, s"Expected $expected for $address%s, but got ${!expected}.") |
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private def validateBitcoinAddress(addr: String): Boolean = { |
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def sha256(data: Array[Byte]) = { |
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val md: MessageDigest = MessageDigest.getInstance("SHA-256") |
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md.update(data) |
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md.digest |
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} |
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def decodeBase58To25Bytes(input: String): Option[Array[Byte]] = { |
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def ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz" |
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@tailrec |
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def loop(s: String, accu: BigInt): BigInt = { |
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if (s.isEmpty) accu |
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else { |
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val p = ALPHABET.indexOf(s.head) |
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if (p >= 0) loop(s.tail, accu * 58 + p) |
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else -1 |
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} |
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} |
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val num = loop(input, 0) |
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if (num >= 0) { |
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val (result, numBytes) = (new Array[Byte](25), num.toByteArray) |
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System.arraycopy(numBytes, 0, result, result.length - numBytes.length, numBytes.length) |
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Some(result) |
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} |
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else None |
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} |
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if (27 to 34 contains addr.length) { |
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val decoded = decodeBase58To25Bytes(addr) |
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if (decoded.isEmpty) false |
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else { |
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val hash1 = sha256(copyOfRange(decoded.get, 0, 21)) |
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copyOfRange(sha256(hash1), 0, 4) |
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.sameElements(copyOfRange(decoded.get, 21, 25)) |
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} |
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} else false |
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} // validateBitcoinAddress |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i", true) |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62j", false) |
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bitcoinTestHarness("1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nK9", true) |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62X", false) |
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bitcoinTestHarness("1ANNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i", false) |
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bitcoinTestHarness("1A Na15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i", false) |
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bitcoinTestHarness("BZbvjr", false) |
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bitcoinTestHarness("i55j", false) |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62!", false) |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62iz", false) |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62izz", false) |
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bitcoinTestHarness("1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nJ9", false) |
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bitcoinTestHarness("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62I", false) |
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println(s"Successfully completed without errors. [total ${scala.compat.Platform.currentTime - executionStart}ms]") |
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}</lang> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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{{tcllib|sha256}} |
{{tcllib|sha256}} |