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Support incremental hashing via HashFunction
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23 changes: 23 additions & 0 deletions
23
cryptography-core/src/commonMain/kotlin/functions/HashFunction.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| /* | ||
| * Copyright (c) 2024 Oleg Yukhnevich. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
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| package dev.whyoleg.cryptography.functions | ||
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| import dev.whyoleg.cryptography.* | ||
| import kotlinx.io.bytestring.* | ||
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| public interface HashFunction : UpdateFunction { | ||
| public val digestSize: Int | ||
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| public fun hashIntoByteArray(destination: ByteArray, destinationOffset: Int = 0): Int | ||
| public fun hashToByteArray(): ByteArray { | ||
| val output = ByteArray(digestSize) | ||
| hashIntoByteArray(output) | ||
| return output | ||
| } | ||
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| public fun hash(): ByteString = hashToByteArray().asByteString() | ||
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| public fun reset() | ||
| } |
70 changes: 70 additions & 0 deletions
70
cryptography-core/src/commonMain/kotlin/functions/UpdateFunction.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| /* | ||
| * Copyright (c) 2024 Oleg Yukhnevich. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
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| package dev.whyoleg.cryptography.functions | ||
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| import dev.whyoleg.cryptography.* | ||
| import kotlinx.io.* | ||
| import kotlinx.io.bytestring.* | ||
| import kotlinx.io.unsafe.* | ||
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| public interface UpdateFunction : AutoCloseable { | ||
| public fun update(source: ByteArray, startIndex: Int = 0, endIndex: Int = source.size) | ||
| public fun update(source: ByteString, startIndex: Int = 0, endIndex: Int = source.size) { | ||
| update(source.asByteArray(), startIndex, endIndex) | ||
| } | ||
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| public fun updatingSource(source: RawSource): RawSource = UpdatingSource(this, source) | ||
| public fun updatingSink(sink: RawSink): RawSink = UpdatingSink(this, sink) | ||
| } | ||
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| private class UpdatingSource( | ||
| private val function: UpdateFunction, | ||
| private val source: RawSource, | ||
| ) : RawSource { | ||
| override fun readAtMostTo(sink: Buffer, byteCount: Long): Long { | ||
| val result = source.readAtMostTo(sink, byteCount) | ||
| if (result != -1L) { | ||
| @OptIn(UnsafeIoApi::class) | ||
| UnsafeBufferOperations.iterate(sink, sink.size - result) { context, head, _ -> | ||
| var segment = head | ||
| while (segment != null) { | ||
| context.withData(segment, function::update) | ||
| segment = context.next(segment) | ||
| } | ||
| } | ||
| } | ||
| return result | ||
| } | ||
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| override fun close(): Unit = source.close() | ||
| } | ||
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| private class UpdatingSink( | ||
| private val function: UpdateFunction, | ||
| private val sink: RawSink, | ||
| ) : RawSink { | ||
| override fun write(source: Buffer, byteCount: Long) { | ||
| source.require(byteCount) | ||
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| @OptIn(UnsafeIoApi::class) | ||
| UnsafeBufferOperations.iterate(source) { context, head -> | ||
| var consumedCount = 0L | ||
| var segment = head | ||
| while (segment != null && consumedCount < byteCount) { | ||
| context.withData(segment) { bytes, startIndex, endIndex -> | ||
| val toUpdate = minOf(byteCount - consumedCount, (endIndex - startIndex).toLong()).toInt() | ||
| function.update(bytes, startIndex, startIndex + toUpdate) | ||
| consumedCount += toUpdate | ||
| } | ||
| segment = context.next(segment) | ||
| } | ||
| } | ||
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| sink.write(source, byteCount) | ||
| } | ||
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| override fun flush(): Unit = sink.flush() | ||
| override fun close(): Unit = sink.close() | ||
| } |
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