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Implement Kotlin-style DSL for DER encoding
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vclib/src/commonMain/kotlin/at/asitplus/wallet/lib/asn1/Asn1Encoder.kt
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| package at.asitplus.wallet.lib.asn1 | ||
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| import at.asitplus.wallet.lib.CryptoPublicKey | ||
| import at.asitplus.wallet.lib.jws.JwsAlgorithm | ||
| import at.asitplus.wallet.lib.jws.JwsExtensions.encodeToByteArray | ||
| import at.asitplus.wallet.lib.jws.TbsCertificate | ||
| import io.matthewnelson.encoding.base16.Base16 | ||
| import io.matthewnelson.encoding.core.Decoder.Companion.decodeToByteArray | ||
| import kotlinx.datetime.Instant | ||
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| fun tag(tag: Int, block: () -> ByteArray): ByteArray { | ||
| val value = block() | ||
| return byteArrayOf(tag.toByte()) + value.size.encodeLength() + value | ||
| } | ||
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| fun long(block: () -> Long) = tag(0x02) { block().encodeToByteArray().dropWhile { it == 0.toByte() }.toByteArray() } | ||
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| fun int(block: () -> Int) = tag(0x02) { block().encodeToByteArray().dropWhile { it == 0.toByte() }.toByteArray() } | ||
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| fun bitString(block: () -> ByteArray) = tag(0x03) { (byteArrayOf(0x00) + block()) } | ||
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| fun oid(block: () -> String): ByteArray = tag(0x06) { block().decodeToByteArray(Base16()) } | ||
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| fun sequence(block: () -> List<ByteArray>) = tag(0x30) { block().fold(byteArrayOf()) { acc, bytes -> acc + bytes } } | ||
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| fun set(block: () -> List<ByteArray>) = tag(0x31) { block().fold(byteArrayOf()) { acc, bytes -> acc + bytes } } | ||
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| fun utf8String(block: () -> String) = tag(0x0c) { block().encodeToByteArray() } | ||
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| fun commonName(block: () -> String) = oid { "550403" } + utf8String { block() } | ||
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| fun subjectPublicKey(block: () -> CryptoPublicKey) = when (val value = block()) { | ||
| is CryptoPublicKey.Ec -> value.encodeToDer() | ||
| } | ||
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| fun utcTime(block: () -> Instant): ByteArray { | ||
| val value = block() | ||
| val matchResult = | ||
| Regex("[0-9]{2}([0-9]{2})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})\\.([0-9]+)Z") | ||
| .matchEntire(value.toString()) | ||
| ?: throw IllegalArgumentException("instant serialization failed: ${value}") | ||
| val year = | ||
| matchResult.groups[1]?.value | ||
| ?: throw IllegalArgumentException("instant serialization year failed: ${value}") | ||
| val month = | ||
| matchResult.groups[2]?.value | ||
| ?: throw IllegalArgumentException("instant serialization month failed: ${value}") | ||
| val day = | ||
| matchResult.groups[3]?.value ?: throw IllegalArgumentException("instant serialization day failed: ${value}") | ||
| val hour = | ||
| matchResult.groups[4]?.value | ||
| ?: throw IllegalArgumentException("instant serialization hour failed: ${value}") | ||
| val minute = | ||
| matchResult.groups[5]?.value | ||
| ?: throw IllegalArgumentException("instant serialization minute failed: ${value}") | ||
| val seconds = | ||
| matchResult.groups[6]?.value | ||
| ?: throw IllegalArgumentException("instant serialization seconds failed: ${value}") | ||
| val string = "$year$month$day$hour$minute${seconds}Z" | ||
| return tag(0x17) { string.encodeToByteArray() } | ||
| } | ||
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| fun tbsCertificate(block: () -> TbsCertificate) = block().encodeToDer() | ||
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| fun sigAlg(block: () -> JwsAlgorithm): ByteArray = when (val value = block()) { | ||
| JwsAlgorithm.ES256 -> sequence { listOf(oid { "2A8648CE3D040302" }) } | ||
| else -> throw IllegalArgumentException("sigAlg: $value") | ||
| } | ||
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| private fun CryptoPublicKey.Ec.encodeToDer(): ByteArray { | ||
| val ecKeyTag = oid { "2A8648CE3D0201" } | ||
| val ecEncryptionNullTag = oid { "2A8648CE3D030107" } | ||
| val content = bitString { (byteArrayOf(0x04.toByte()) + x + y) } | ||
| return sequence { listOf(sequence { listOf(ecKeyTag, ecEncryptionNullTag) }, content) } | ||
| } | ||
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| private fun Int.encodeLength(): ByteArray { | ||
| if (this < 128) { | ||
| return byteArrayOf(this.toByte()) | ||
| } | ||
| if (this < 0x100) { | ||
| return byteArrayOf(0x81.toByte(), this.toByte()) | ||
| } | ||
| if (this < 0x8000) { | ||
| return byteArrayOf(0x82.toByte(), (this ushr 8).toByte(), this.toByte()) | ||
| } | ||
| throw IllegalArgumentException("length $this") | ||
| } |
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