451 lines
21 KiB
Kotlin
451 lines
21 KiB
Kotlin
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.encryption_signing
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import org.bouncycastle.openpgp.*
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import org.pgpainless.PGPainless.Companion.getPolicy
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import org.pgpainless.PGPainless.Companion.inspectKeyRing
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import org.pgpainless.algorithm.DocumentSignatureType
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import org.pgpainless.algorithm.HashAlgorithm
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import org.pgpainless.algorithm.PublicKeyAlgorithm.Companion.requireFromId
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import org.pgpainless.algorithm.negotiation.HashAlgorithmNegotiator.Companion.negotiateSignatureHashAlgorithm
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import org.pgpainless.exception.KeyException
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import org.pgpainless.exception.KeyException.*
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import org.pgpainless.implementation.ImplementationFactory
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import org.pgpainless.key.OpenPgpFingerprint.Companion.of
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import org.pgpainless.key.SubkeyIdentifier
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import org.pgpainless.key.protection.SecretKeyRingProtector
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import org.pgpainless.key.protection.UnlockSecretKey.Companion.unlockSecretKey
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import org.pgpainless.policy.Policy
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import org.pgpainless.signature.subpackets.BaseSignatureSubpackets.Callback
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import org.pgpainless.signature.subpackets.SignatureSubpackets
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import org.pgpainless.signature.subpackets.SignatureSubpacketsHelper
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import java.util.*
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class SigningOptions {
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val signingMethods: Map<SubkeyIdentifier, SigningMethod> = mutableMapOf()
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private var _hashAlgorithmOverride: HashAlgorithm? = null
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private var _evaluationDate: Date = Date()
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val hashAlgorithmOverride: HashAlgorithm?
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get() = _hashAlgorithmOverride
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/**
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* Override hash algorithm negotiation by dictating which hash algorithm needs to be used.
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* If no override has been set, an acceptable algorithm will be negotiated instead.
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* Note: To override the hash algorithm for signing, call this method *before* calling
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* [addInlineSignature] or [addDetachedSignature].
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*
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* @param hashAlgorithmOverride override hash algorithm
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* @return this
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*/
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fun overrideHashAlgorithm(hashAlgorithmOverride: HashAlgorithm) = apply {
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_hashAlgorithmOverride = hashAlgorithmOverride
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}
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val evaluationDate: Date
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get() = _evaluationDate
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/**
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* Override the evaluation date for signing keys with the given date.
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*
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* @param evaluationDate new evaluation date
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* @return this
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*/
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fun setEvaluationDate(evaluationDate: Date) = apply {
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_evaluationDate = evaluationDate
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}
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/**
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* Sign the message using an inline signature made by the provided signing key.
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*
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* @param signingKeyProtector protector to unlock the signing key
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* @param signingKey key ring containing the signing key
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* @return this
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*
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* @throws KeyException if something is wrong with the key
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* @throws PGPException if the key cannot be unlocked or a signing method cannot be created
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*/
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@Throws(KeyException::class, PGPException::class)
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fun addSignature(signingKeyProtector: SecretKeyRingProtector, signingKey: PGPSecretKeyRing) = apply {
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addInlineSignature(signingKeyProtector, signingKey, null, DocumentSignatureType.BINARY_DOCUMENT)
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}
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/**
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* Add inline signatures with all secret key rings in the provided secret key ring collection.
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*
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* @param signingKeyProtector decryptor to unlock the signing secret keys
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* @param signingKeys collection of signing keys
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* @param signatureType type of signature (binary, canonical text)
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* @return this
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*
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* @throws KeyException if something is wrong with any of the keys
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* @throws PGPException if any of the keys cannot be unlocked or a signing method cannot be created
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*/
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@Throws(KeyException::class, PGPException::class)
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fun addInlineSignatures(signingKeyProtector: SecretKeyRingProtector,
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signingKeys: Iterable<PGPSecretKeyRing>,
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signatureType: DocumentSignatureType) = apply {
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signingKeys.forEach {
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addInlineSignature(signingKeyProtector, it, null, signatureType)
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}
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}
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/**
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* Add an inline-signature.
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* Inline signatures are being embedded into the message itself and can be processed in one pass, thanks to the use
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* of one-pass-signature packets.
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*
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* @param signingKeyProtector decryptor to unlock the signing secret key
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* @param signingKey signing key
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* @param signatureType type of signature (binary, canonical text)
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* @return this
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*
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* @throws KeyException if something is wrong with the key
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* @throws PGPException if the key cannot be unlocked or the signing method cannot be created
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*/
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@Throws(KeyException::class, PGPException::class)
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fun addInlineSignature(signingKeyProtector: SecretKeyRingProtector,
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signingKey: PGPSecretKeyRing,
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signatureType: DocumentSignatureType) = apply {
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addInlineSignature(signingKeyProtector, signingKey, null, signatureType)
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}
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/**
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* Add an inline-signature.
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* Inline signatures are being embedded into the message itself and can be processed in one pass, thanks to the use
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* of one-pass-signature packets.
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* <p>
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* This method uses the passed in user-id to select user-specific hash algorithms.
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*
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* @param signingKeyProtector decryptor to unlock the signing secret key
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* @param signingKey signing key
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* @param userId user-id of the signer
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* @param signatureType signature type (binary, canonical text)
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* @param subpacketsCallback callback to modify the hashed and unhashed subpackets of the signature
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* @return this
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*
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* @throws KeyException if the key is invalid
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* @throws PGPException if the key cannot be unlocked or the signing method cannot be created
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*/
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@Throws(KeyException::class, PGPException::class)
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@JvmOverloads
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fun addInlineSignature(signingKeyProtector: SecretKeyRingProtector,
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signingKey: PGPSecretKeyRing,
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userId: CharSequence? = null,
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signatureType: DocumentSignatureType = DocumentSignatureType.BINARY_DOCUMENT,
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subpacketsCallback: Callback? = null) = apply {
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val keyRingInfo = inspectKeyRing(signingKey, evaluationDate)
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if (userId != null && !keyRingInfo.isUserIdValid(userId)) {
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throw UnboundUserIdException(
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of(signingKey),
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userId.toString(),
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keyRingInfo.getLatestUserIdCertification(userId),
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keyRingInfo.getUserIdRevocation(userId)
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)
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}
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val signingPubKeys = keyRingInfo.signingSubkeys
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if (signingPubKeys.isEmpty()) {
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throw UnacceptableSigningKeyException(of(signingKey))
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}
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for (signingPubKey in signingPubKeys) {
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val signingSecKey: PGPSecretKey = signingKey.getSecretKey(signingPubKey.keyID)
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?: throw MissingSecretKeyException(of(signingKey), signingPubKey.keyID)
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val signingSubkey: PGPPrivateKey = unlockSecretKey(signingSecKey, signingKeyProtector)
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val hashAlgorithms =
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if (userId != null) keyRingInfo.getPreferredHashAlgorithms(userId)
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else keyRingInfo.getPreferredHashAlgorithms(signingPubKey.keyID)
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val hashAlgorithm: HashAlgorithm = negotiateHashAlgorithm(hashAlgorithms, getPolicy())
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addSigningMethod(signingKey, signingSubkey, hashAlgorithm, signatureType, false, subpacketsCallback)
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}
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}
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/**
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* Create an inline signature using the signing key with the given keyId.
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*
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* @param signingKeyProtector decryptor to unlock the secret key
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* @param signingKey secret key ring
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* @param keyId keyId of the signing (sub-)key
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* @param signatureType signature type
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* @param subpacketsCallback callback to modify the signatures subpackets
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* @return builder
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* @throws PGPException if the secret key cannot be unlocked or if no signing method can be created.
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* @throws KeyException.UnacceptableSigningKeyException if the key ring does not carry any signing-capable subkeys
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* @throws KeyException.MissingSecretKeyException if the key ring does not contain the identified secret key
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*/
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@Throws(KeyException::class, PGPException::class)
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@JvmOverloads
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fun addInlineSignature(signingKeyProtector: SecretKeyRingProtector,
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signingKey: PGPSecretKeyRing,
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keyId: Long,
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signatureType: DocumentSignatureType = DocumentSignatureType.BINARY_DOCUMENT,
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subpacketsCallback: Callback? = null) = apply {
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val keyRingInfo = inspectKeyRing(signingKey, evaluationDate)
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val signingPubKeys = keyRingInfo.signingSubkeys
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if (signingPubKeys.isEmpty()) {
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throw UnacceptableSigningKeyException(of(signingKey))
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}
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for (signingPubKey in signingPubKeys) {
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if (signingPubKey.keyID != keyId) {
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continue
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}
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val signingSecKey = signingKey.getSecretKey(signingPubKey.keyID)
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?: throw MissingSecretKeyException(of(signingKey), signingPubKey.keyID)
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val signingSubkey = unlockSecretKey(signingSecKey, signingKeyProtector)
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val hashAlgorithms = keyRingInfo.getPreferredHashAlgorithms(signingPubKey.keyID)
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val hashAlgorithm: HashAlgorithm = negotiateHashAlgorithm(hashAlgorithms, getPolicy())
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addSigningMethod(signingKey, signingSubkey, hashAlgorithm, signatureType, false, subpacketsCallback)
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return this
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}
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throw MissingSecretKeyException(of(signingKey), keyId)
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}
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/**
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* Add detached signatures with all key rings from the provided secret key ring collection.
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*
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* @param signingKeyProtector decryptor to unlock the secret signing keys
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* @param signingKeys collection of signing key rings
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* @param signatureType type of the signature (binary, canonical text)
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* @return this
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*
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* @throws KeyException if something is wrong with any of the keys
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* @throws PGPException if any of the keys cannot be validated or unlocked, or if any signing method cannot be created
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*/
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@Throws(KeyException::class, PGPException::class)
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fun addDetachedSignatures(signingKeyProtector: SecretKeyRingProtector,
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signingKeys: Iterable<PGPSecretKeyRing>,
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signatureType: DocumentSignatureType) = apply {
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signingKeys.forEach {
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addDetachedSignature(signingKeyProtector, it, null, signatureType)
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}
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}
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/**
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* Create a detached signature.
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* Detached signatures are not being added into the PGP message itself.
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* Instead, they can be distributed separately to the message.
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* Detached signatures are useful if the data that is being signed shall not be modified (e.g. when signing a file).
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*
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* @param signingKeyProtector decryptor to unlock the secret signing key
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* @param signingKey signing key
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* @param signatureType type of data that is signed (binary, canonical text)
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* @return this
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*
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* @throws KeyException if something is wrong with the key
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* @throws PGPException if the key cannot be validated or unlocked, or if no signature method can be created
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*/
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@Throws(KeyException::class, PGPException::class)
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fun addDetachedSignature(signingKeyProtector: SecretKeyRingProtector,
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signingKey: PGPSecretKeyRing,
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signatureType: DocumentSignatureType) = apply {
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addDetachedSignature(signingKeyProtector, signingKey, null, signatureType)
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}
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/**
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* Create a detached signature.
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* Detached signatures are not being added into the PGP message itself.
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* Instead, they can be distributed separately to the message.
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* Detached signatures are useful if the data that is being signed shall not be modified (e.g. when signing a file).
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* <p>
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* This method uses the passed in user-id to select user-specific hash algorithms.
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*
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* @param signingKeyProtector decryptor to unlock the secret signing key
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* @param signingKey signing key
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* @param userId user-id
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* @param signatureType type of data that is signed (binary, canonical text)
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* @param subpacketCallback callback to modify hashed and unhashed subpackets of the signature
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* @return this
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*
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* @throws KeyException if something is wrong with the key
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* @throws PGPException if the key cannot be validated or unlocked, or if no signature method can be created
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*/
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@JvmOverloads
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@Throws(KeyException::class, PGPException::class)
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fun addDetachedSignature(signingKeyProtector: SecretKeyRingProtector,
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signingKey: PGPSecretKeyRing,
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userId: String? = null,
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signatureType: DocumentSignatureType = DocumentSignatureType.BINARY_DOCUMENT,
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subpacketCallback: Callback? = null) = apply {
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val keyRingInfo = inspectKeyRing(signingKey, evaluationDate)
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if (userId != null && !keyRingInfo.isUserIdValid(userId)) {
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throw UnboundUserIdException(
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of(signingKey),
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userId.toString(),
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keyRingInfo.getLatestUserIdCertification(userId),
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keyRingInfo.getUserIdRevocation(userId)
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)
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}
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val signingPubKeys = keyRingInfo.signingSubkeys
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if (signingPubKeys.isEmpty()) {
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throw UnacceptableSigningKeyException(of(signingKey))
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}
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for (signingPubKey in signingPubKeys) {
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val signingSecKey: PGPSecretKey = signingKey.getSecretKey(signingPubKey.keyID)
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?: throw MissingSecretKeyException(of(signingKey), signingPubKey.keyID)
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val signingSubkey: PGPPrivateKey = unlockSecretKey(signingSecKey, signingKeyProtector)
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val hashAlgorithms =
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if (userId != null) keyRingInfo.getPreferredHashAlgorithms(userId)
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else keyRingInfo.getPreferredHashAlgorithms(signingPubKey.keyID)
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val hashAlgorithm: HashAlgorithm = negotiateHashAlgorithm(hashAlgorithms, getPolicy())
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addSigningMethod(signingKey, signingSubkey, hashAlgorithm, signatureType, true, subpacketCallback)
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}
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}
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/**
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* Create a detached signature using the signing key with the given keyId.
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*
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* @param signingKeyProtector decryptor to unlock the secret key
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* @param signingKey secret key ring
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* @param keyId keyId of the signing (sub-)key
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* @param signatureType signature type
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* @param subpacketsCallback callback to modify the signatures subpackets
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* @return builder
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* @throws PGPException if the secret key cannot be unlocked or if no signing method can be created.
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* @throws KeyException.UnacceptableSigningKeyException if the key ring does not carry any signing-capable subkeys
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* @throws KeyException.MissingSecretKeyException if the key ring does not contain the identified secret key
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*/
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@Throws(KeyException::class, PGPException::class)
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@JvmOverloads
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fun addDetachedSignature(signingKeyProtector: SecretKeyRingProtector,
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signingKey: PGPSecretKeyRing,
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keyId: Long,
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signatureType: DocumentSignatureType = DocumentSignatureType.BINARY_DOCUMENT,
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subpacketsCallback: Callback? = null) = apply {
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val keyRingInfo = inspectKeyRing(signingKey, evaluationDate)
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val signingPubKeys = keyRingInfo.signingSubkeys
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if (signingPubKeys.isEmpty()) {
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throw UnacceptableSigningKeyException(of(signingKey))
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}
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for (signingPubKey in signingPubKeys) {
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if (signingPubKey.keyID == keyId) {
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val signingSecKey: PGPSecretKey = signingKey.getSecretKey(signingPubKey.keyID)
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?: throw MissingSecretKeyException(of(signingKey), signingPubKey.keyID)
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val signingSubkey: PGPPrivateKey = unlockSecretKey(signingSecKey, signingKeyProtector)
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val hashAlgorithms = keyRingInfo.getPreferredHashAlgorithms(signingPubKey.keyID)
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val hashAlgorithm: HashAlgorithm = negotiateHashAlgorithm(hashAlgorithms, getPolicy())
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addSigningMethod(signingKey, signingSubkey, hashAlgorithm, signatureType, true, subpacketsCallback)
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return this
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}
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}
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throw MissingSecretKeyException(of(signingKey), keyId)
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}
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private fun addSigningMethod(signingKey: PGPSecretKeyRing,
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signingSubkey: PGPPrivateKey,
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hashAlgorithm: HashAlgorithm,
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signatureType: DocumentSignatureType,
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detached: Boolean,
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subpacketCallback: Callback? = null) {
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val signingKeyIdentifier = SubkeyIdentifier(signingKey, signingSubkey.keyID)
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val signingSecretKey: PGPSecretKey = signingKey.getSecretKey(signingSubkey.keyID)
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val publicKeyAlgorithm = requireFromId(signingSecretKey.publicKey.algorithm)
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val bitStrength = signingSecretKey.publicKey.bitStrength
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if (!getPolicy().publicKeyAlgorithmPolicy.isAcceptable(publicKeyAlgorithm, bitStrength)) {
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throw UnacceptableSigningKeyException(
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PublicKeyAlgorithmPolicyException(
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of(signingKey), signingSecretKey.keyID, publicKeyAlgorithm, bitStrength))
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}
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val generator: PGPSignatureGenerator = createSignatureGenerator(signingSubkey, hashAlgorithm, signatureType)
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// Subpackets
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val hashedSubpackets = SignatureSubpackets.createHashedSubpackets(signingSecretKey.publicKey)
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val unhashedSubpackets = SignatureSubpackets.createEmptySubpackets()
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if (subpacketCallback != null) {
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subpacketCallback.modifyHashedSubpackets(hashedSubpackets)
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subpacketCallback.modifyUnhashedSubpackets(unhashedSubpackets)
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}
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generator.setHashedSubpackets(SignatureSubpacketsHelper.toVector(hashedSubpackets))
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generator.setUnhashedSubpackets(SignatureSubpacketsHelper.toVector(unhashedSubpackets))
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val signingMethod =
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if (detached) SigningMethod.detachedSignature(generator, hashAlgorithm)
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else SigningMethod.inlineSignature(generator, hashAlgorithm)
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(signingMethods as MutableMap)[signingKeyIdentifier] = signingMethod
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}
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/**
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* Negotiate, which hash algorithm to use.
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*
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*
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* This method gives the highest priority to the algorithm override, which can be set via [.overrideHashAlgorithm].
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* After that, the signing keys hash algorithm preferences are iterated to find the first acceptable algorithm.
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* Lastly, should no acceptable algorithm be found, the [Policies][Policy] default signature hash algorithm is
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* used as a fallback.
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*
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* @param preferences preferences
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* @param policy policy
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* @return selected hash algorithm
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*/
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private fun negotiateHashAlgorithm(preferences: Set<HashAlgorithm>,
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policy: Policy): HashAlgorithm {
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return _hashAlgorithmOverride ?: negotiateSignatureHashAlgorithm(policy).negotiateHashAlgorithm(preferences)
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}
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@Throws(PGPException::class)
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private fun createSignatureGenerator(privateKey: PGPPrivateKey,
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hashAlgorithm: HashAlgorithm,
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signatureType: DocumentSignatureType): PGPSignatureGenerator {
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return ImplementationFactory.getInstance()
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.getPGPContentSignerBuilder(privateKey.publicKeyPacket.algorithm, hashAlgorithm.algorithmId)
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.let { csb ->
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PGPSignatureGenerator(csb).also { it.init(signatureType.signatureType.code, privateKey) }
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}
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}
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companion object {
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@JvmStatic
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fun get() = SigningOptions()
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}
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/**
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* A method of signing.
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*/
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class SigningMethod private constructor(
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val signatureGenerator: PGPSignatureGenerator,
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val isDetached: Boolean,
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val hashAlgorithm: HashAlgorithm
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) {
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companion object {
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/**
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* Inline-signature method.
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* The resulting signature will be written into the message itself, together with a one-pass-signature packet.
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*
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* @param signatureGenerator signature generator
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* @param hashAlgorithm hash algorithm used to generate the signature
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* @return inline signing method
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*/
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@JvmStatic
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fun inlineSignature(signatureGenerator: PGPSignatureGenerator, hashAlgorithm: HashAlgorithm) =
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SigningMethod(signatureGenerator, false, hashAlgorithm)
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/**
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* Detached signing method.
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* The resulting signature will not be added to the message, and instead can be distributed separately
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* to the signed message.
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*
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* @param signatureGenerator signature generator
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* @param hashAlgorithm hash algorithm used to generate the signature
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* @return detached signing method
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*/
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@JvmStatic
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fun detachedSignature(signatureGenerator: PGPSignatureGenerator, hashAlgorithm: HashAlgorithm) =
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SigningMethod(signatureGenerator, true, hashAlgorithm)
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}
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}
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} |