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SignatureCodec.scala
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SignatureCodec.scala
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/*
* Copyright (c) 2013, Scodec
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package scodec
package codecs
import java.security.{KeyPair, PrivateKey, PublicKey, Signature, SignatureException}
import java.security.cert.Certificate
import scodec.bits.{BitVector, ByteVector}
/** Represents the ability to create a "checksum" for use with [[fixedSizeSignature]] and [[variableSizeSignature]].
*/
trait Signer:
def update(data: Array[Byte]): Unit
def sign: Array[Byte]
def verify(signature: Array[Byte]): Boolean
/** Signer implementation for `java.security.Signature`
*/
class SignatureSigner(impl: Signature) extends Signer:
def update(data: Array[Byte]): Unit = impl.update(data)
def sign: Array[Byte] = impl.sign.nn
def verify(signature: Array[Byte]): Boolean = impl.verify(signature)
/** Represents the ability to create a [[Signer]] for use with [[fixedSizeSignature]] and [[variableSizeSignature]].
*/
trait SignerFactory:
/** Creates a [[Signer]] initialized for signing. */
def newSigner: Signer
/** Creates a [[Signer]] initialized for verifying. */
def newVerifier: Signer
/** Create `java.security.Signature` implementations for [[SignerFactory]]
*/
object SignatureFactory:
/** Creates a signature factory for the specified algorithm using the specified private and public keys. */
def apply(algorithm: String, privateKey: PrivateKey, publicKey: PublicKey): SignerFactory =
new SimpleSignatureFactory(algorithm, privateKey, publicKey)
/** Creates a signature factory for the specified algorithm using the specified key pair. */
def apply(algorithm: String, keyPair: KeyPair): SignerFactory =
new SimpleSignatureFactory(algorithm, keyPair.getPrivate.nn, keyPair.getPublic.nn)
/** Creates a signature factory for the specified algorithm using the specified key pair. */
def apply(algorithm: String, privateKey: PrivateKey, certificate: Certificate): SignerFactory =
new SimpleSignatureFactory(algorithm, privateKey, certificate.getPublicKey.nn)
/** Creates a signature factory that only supports signing for the specified algorithm using the specified private key. */
def signing(algorithm: String, privateKey: PrivateKey): SignerFactory =
new SimpleSignatureFactorySigning(algorithm, privateKey) with SignerFactory {
def newVerifier =
sys.error("Cannot verify with a signature factory that only supports signing.")
}
/** Creates a signature factory that only supports signing for the specified algorithm using the specified public key. */
def verifying(algorithm: String, publicKey: PublicKey): SignerFactory =
new SimpleSignatureFactoryVerifying(algorithm, publicKey) with SignerFactory {
def newSigner =
sys.error("Cannot sign with a signature factory that only supports verifying.")
}
/** Creates a signature factory that only supports signing for the specified algorithm using the specified public key. */
def verifying(algorithm: String, certificate: Certificate): SignerFactory =
verifying(algorithm, certificate.getPublicKey.nn)
private trait WithSignature:
protected def algorithm: String
protected def newSignature: Signature =
Signature.getInstance(algorithm).nn
private trait SignatureFactorySigning extends WithSignature:
protected def privateKey: PrivateKey
def newSigner: Signer =
val sig = newSignature
sig.initSign(privateKey)
new SignatureSigner(sig)
private class SimpleSignatureFactorySigning(
protected val algorithm: String,
protected val privateKey: PrivateKey
) extends SignatureFactorySigning
private trait SignatureFactoryVerifying extends WithSignature:
protected def publicKey: PublicKey
def newVerifier: Signer =
val sig = newSignature
sig.initVerify(publicKey)
new SignatureSigner(sig)
private class SimpleSignatureFactoryVerifying(
protected val algorithm: String,
protected val publicKey: PublicKey
) extends SignatureFactoryVerifying
private class SimpleSignatureFactory(
protected val algorithm: String,
protected val privateKey: PrivateKey,
protected val publicKey: PublicKey
) extends SignerFactory
with SignatureFactorySigning
with SignatureFactoryVerifying
/** @see [[fixedSizeSignature]] and [[variableSizeSignature]] */
private[codecs] final class SignatureCodec[A](
codec: Codec[A],
signatureCodec: Codec[BitVector],
signerFactory: SignerFactory
) extends Codec[A]:
override def sizeBound = codec.sizeBound + signatureCodec.sizeBound
override def encode(a: A) =
for
encoded <- codec.encode(a)
sig <- sign(encoded)
encodedSig <- signatureCodec.encode(sig)
yield encoded ++ encodedSig
private def sign(bits: BitVector): Attempt[BitVector] =
try
val signature = signerFactory.newSigner
signature.update(bits.toByteArray)
Attempt.successful(BitVector(signature.sign))
catch
case e: SignatureException =>
Attempt.failure(Err("Failed to sign: " + e.getMessage))
override def decode(buffer: BitVector) =
(for
initialBits <- Decoder.get
value <- codec
bitsAfterValueDecoding <- Decoder.get
valueBits = initialBits.take(initialBits.size - bitsAfterValueDecoding.size)
decodedSig <- signatureCodec
_ <- Decoder.liftAttempt(verify(valueBits.toByteVector, decodedSig.toByteVector))
yield value).decode(buffer)
private def verify(data: ByteVector, signatureBytes: ByteVector): Attempt[Unit] =
val verifier = signerFactory.newVerifier
verifier.update(data.toArray)
try
if verifier.verify(signatureBytes.toArray) then Attempt.successful(())
else Attempt.failure(Err("Signature verification failed"))
catch
case e: SignatureException =>
Attempt.failure(Err("Signature verification failed: " + e))
override def toString = s"signature($codec, $signatureCodec)"