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/*
* Copyright (C) 2020 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okio
import okio.internal.HashFunction
import okio.internal.Hmac
import okio.internal.Md5
import okio.internal.Sha1
import okio.internal.Sha256
import okio.internal.Sha512
actual class HashingSink internal constructor(
private val sink: Sink,
private val hashFunction: HashFunction
) : Sink {
override fun write(source: Buffer, byteCount: Long) {
checkOffsetAndCount(source.size, 0, byteCount)
// Hash byteCount bytes from the prefix of source.
var hashedCount = 0L
var s = source.head!!
while (hashedCount < byteCount) {
val toHash = minOf(byteCount - hashedCount, s.limit - s.pos).toInt()
hashFunction.update(s.data, s.pos, toHash)
hashedCount += toHash
s = s.next!!
}
// Write those bytes to the sink.
sink.write(source, byteCount)
}
override fun flush() = sink.flush()
override fun timeout(): Timeout = sink.timeout()
override fun close() = sink.close()
/**
* Returns the hash of the bytes accepted thus far and resets the internal state of this sink.
*
* **Warning:** This method is not idempotent. Each time this method is called its
* internal state is cleared. This starts a new hash with zero bytes accepted.
*/
actual val hash: ByteString
get() {
val result = hashFunction.digest()
return ByteString(result)
}
actual companion object {
/** Returns a sink that uses the obsolete MD5 hash algorithm to produce 128-bit hashes. */
actual fun md5(sink: Sink) = HashingSink(sink, Md5())
/** Returns a sink that uses the obsolete SHA-1 hash algorithm to produce 160-bit hashes. */
actual fun sha1(sink: Sink) = HashingSink(sink, Sha1())
/** Returns a sink that uses the SHA-256 hash algorithm to produce 256-bit hashes. */
actual fun sha256(sink: Sink) = HashingSink(sink, Sha256())
/** Returns a sink that uses the SHA-512 hash algorithm to produce 512-bit hashes. */
actual fun sha512(sink: Sink) = HashingSink(sink, Sha512())
/** Returns a sink that uses the obsolete SHA-1 HMAC algorithm to produce 160-bit hashes. */
actual fun hmacSha1(sink: Sink, key: ByteString) = HashingSink(sink, Hmac.sha1(key))
/** Returns a sink that uses the SHA-256 HMAC algorithm to produce 256-bit hashes. */
actual fun hmacSha256(sink: Sink, key: ByteString) = HashingSink(sink, Hmac.sha256(key))
/** Returns a sink that uses the SHA-512 HMAC algorithm to produce 512-bit hashes. */
actual fun hmacSha512(sink: Sink, key: ByteString) = HashingSink(sink, Hmac.sha512(key))
}
}
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