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/*
* Copyright (C) 2016 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 java.io.IOException
import java.security.InvalidKeyException
import java.security.MessageDigest
import javax.crypto.Mac
import javax.crypto.spec.SecretKeySpec
/**
* A sink that computes a hash of the full stream of bytes it has accepted. To use, create an
* instance with your preferred hash algorithm. Write all of the data to the sink and then call
* [hash] to compute the final hash value.
*
* In this example we use `HashingSink` with a [BufferedSink] to make writing to the
* sink easier.
* ```
* HashingSink hashingSink = HashingSink.sha256(s);
* BufferedSink bufferedSink = Okio.buffer(hashingSink);
*
* ... // Write to bufferedSink and either flush or close it.
*
* ByteString hash = hashingSink.hash();
* ```
*/
actual class HashingSink : ForwardingSink, Sink { // Need to explicitly declare sink pending fix for https://youtrack.jetbrains.com/issue/KT-20641
private val messageDigest: MessageDigest?
private val mac: Mac?
internal constructor(sink: Sink, digest: MessageDigest) : super(sink) {
this.messageDigest = digest
this.mac = null
}
internal constructor(sink: Sink, algorithm: String) : this(sink, MessageDigest.getInstance(algorithm))
internal constructor(sink: Sink, mac: Mac) : super(sink) {
this.mac = mac
this.messageDigest = null
}
internal constructor(sink: Sink, key: ByteString, algorithm: String) : this(
sink,
try {
Mac.getInstance(algorithm).apply {
init(SecretKeySpec(key.toByteArray(), algorithm))
}
} catch (e: InvalidKeyException) {
throw IllegalArgumentException(e)
}
)
@Throws(IOException::class)
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()
if (messageDigest != null) {
messageDigest.update(s.data, s.pos, toHash)
} else {
mac!!.update(s.data, s.pos, toHash)
}
hashedCount += toHash
s = s.next!!
}
// Write those bytes to the sink.
super.write(source, byteCount)
}
/**
* 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.
*/
@get:JvmName("hash")
actual val hash: ByteString
get() {
val result = if (messageDigest != null) messageDigest.digest() else mac!!.doFinal()
return ByteString(result)
}
@JvmName("-deprecated_hash")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "hash"),
level = DeprecationLevel.ERROR
)
fun hash() = hash
actual companion object {
/**
* Returns a sink that uses the obsolete MD5 hash algorithm to produce 128-bit hashes.
*
* MD5 has been vulnerable to collisions since 2004. It should not be used in new code.
*/
@JvmStatic
actual fun md5(sink: Sink) = HashingSink(sink, "MD5")
/**
* Returns a sink that uses the obsolete SHA-1 hash algorithm to produce 160-bit hashes.
*
* SHA-1 has been vulnerable to collisions since 2017. It should not be used in new code.
*/
@JvmStatic
actual fun sha1(sink: Sink) = HashingSink(sink, "SHA-1")
/** Returns a sink that uses the SHA-256 hash algorithm to produce 256-bit hashes. */
@JvmStatic
actual fun sha256(sink: Sink) = HashingSink(sink, "SHA-256")
/** Returns a sink that uses the SHA-512 hash algorithm to produce 512-bit hashes. */
@JvmStatic
actual fun sha512(sink: Sink) = HashingSink(sink, "SHA-512")
/** Returns a sink that uses the obsolete SHA-1 HMAC algorithm to produce 160-bit hashes. */
@JvmStatic
actual fun hmacSha1(sink: Sink, key: ByteString) = HashingSink(sink, key, "HmacSHA1")
/** Returns a sink that uses the SHA-256 HMAC algorithm to produce 256-bit hashes. */
@JvmStatic
actual fun hmacSha256(sink: Sink, key: ByteString) = HashingSink(sink, key, "HmacSHA256")
/** Returns a sink that uses the SHA-512 HMAC algorithm to produce 512-bit hashes. */
@JvmStatic
actual fun hmacSha512(sink: Sink, key: ByteString) = HashingSink(sink, key, "HmacSHA512")
}
}
