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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 source that computes a hash of the full stream of bytes it has supplied. To use, create an
* instance with your preferred hash algorithm. Exhaust the source by reading all of its bytes and
* then call [hash] to compute the final hash value.
*
*
* In this example we use `HashingSource` with a [BufferedSource] to make reading
* from the source easier.
* ```
* HashingSource hashingSource = HashingSource.sha256(rawSource);
* BufferedSource bufferedSource = Okio.buffer(hashingSource);
*
* ... // Read all of bufferedSource.
*
* ByteString hash = hashingSource.hash();
* ```
*/
actual class HashingSource : ForwardingSource, Source { // Need to explicitly declare source pending fix for https://youtrack.jetbrains.com/issue/KT-20641
private val messageDigest: MessageDigest?
private val mac: Mac?
internal constructor(source: Source, digest: MessageDigest) : super(source) {
this.messageDigest = digest
this.mac = null
}
internal constructor(source: Source, algorithm: String) : this(source, MessageDigest.getInstance(algorithm))
internal constructor(source: Source, mac: Mac) : super(source) {
this.mac = mac
this.messageDigest = null
}
internal constructor(source: Source, key: ByteString, algorithm: String) : this(
source,
try {
Mac.getInstance(algorithm).apply {
init(SecretKeySpec(key.toByteArray(), algorithm))
}
} catch (e: InvalidKeyException) {
throw IllegalArgumentException(e)
}
)
@Throws(IOException::class)
override fun read(sink: Buffer, byteCount: Long): Long {
val result = super.read(sink, byteCount)
if (result != -1L) {
var start = sink.size - result
// Find the first segment that has new bytes.
var offset = sink.size
var s = sink.head!!
while (offset > start) {
s = s.prev!!
offset -= (s.limit - s.pos).toLong()
}
// Hash that segment and all the rest until the end.
while (offset < sink.size) {
val pos = (s.pos + start - offset).toInt()
if (messageDigest != null) {
messageDigest.update(s.data, pos, s.limit - pos)
} else {
mac!!.update(s.data, pos, s.limit - pos)
}
offset += s.limit - s.pos
start = offset
s = s.next!!
}
}
return result
}
/**
* Returns the hash of the bytes supplied thus far and resets the internal state of this source.
*
* **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 supplied.
*/
@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 source 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(source: Source) = HashingSource(source, "MD5")
/**
* Returns a source 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(source: Source) = HashingSource(source, "SHA-1")
/** Returns a source that uses the SHA-256 hash algorithm to produce 256-bit hashes. */
@JvmStatic
actual fun sha256(source: Source) = HashingSource(source, "SHA-256")
/** Returns a source that uses the SHA-512 hash algorithm to produce 512-bit hashes. */
@JvmStatic
actual fun sha512(source: Source) = HashingSource(source, "SHA-512")
/** Returns a source that uses the obsolete SHA-1 HMAC algorithm to produce 160-bit hashes. */
@JvmStatic
actual fun hmacSha1(source: Source, key: ByteString) = HashingSource(source, key, "HmacSHA1")
/** Returns a source that uses the SHA-256 HMAC algorithm to produce 256-bit hashes. */
@JvmStatic
actual fun hmacSha256(source: Source, key: ByteString) = HashingSource(source, key, "HmacSHA256")
/** Returns a source that uses the SHA-512 HMAC algorithm to produce 512-bit hashes. */
@JvmStatic
actual fun hmacSha512(source: Source, key: ByteString) = HashingSource(source, key, "HmacSHA512")
}
}
