SignatureBuilders: Add constructors taking PGPKeyPairs

pgpainless-core/src/main/kotlin/org/pgpainless/key/generation/OpenPgpKeyGenerator.kt

@@ -23,6 +23,7 @@ import org.pgpainless.key.generation.type.rsa.RsaLength
 import org.pgpainless.key.generation.type.xdh.XDHSpec
 import org.pgpainless.policy.Policy
 import org.pgpainless.signature.builder.DirectKeySelfSignatureBuilder
+import org.pgpainless.signature.builder.PrimaryKeyBindingSignatureBuilder
 import org.pgpainless.signature.builder.SelfSignatureBuilder
 import org.pgpainless.signature.builder.SubkeyBindingSignatureBuilder
 import org.pgpainless.signature.subpackets.SelfSignatureSubpackets
@@ -738,14 +739,27 @@ abstract class ApplyToSubkey(
             bindingTime: Date,
             subpacketsCallback: SelfSignatureSubpackets.Callback
         ): PGPSignature {
-            return SubkeyBindingSignatureBuilder(
+            return SubkeyBindingSignatureBuilder(primaryKey, hashAlgorithm)
-                    primaryKey.privateKey, primaryKey.publicKey, hashAlgorithm)
                 .applyCallback(
-                    subpacketsCallback.then(
+                    subpacketsCallback
-                        SelfSignatureSubpackets.applyHashed {
+                        .then(
-                            setSignatureCreationTime(bindingTime)
+                            SelfSignatureSubpackets.applyHashed {
-                        }))
+                                setSignatureCreationTime(bindingTime)
-                .build(subkey.publicKey)
+                            })
+                        .then(
+                            SelfSignatureSubpackets.applyHashed {
+                                if (isSigningCapable(getKeyFlags())) {
+                                    addEmbeddedSignature(
+                                        PrimaryKeyBindingSignatureBuilder(subkey, hashAlgorithm)
+                                            .build(primaryKey))
+                                }
+                            }))
+                .build(subkey)
+        }
+
+        private fun isSigningCapable(flags: List<KeyFlag>?): Boolean {
+            val signCapableFlags = listOf(KeyFlag.SIGN_DATA, KeyFlag.CERTIFY_OTHER)
+            return flags?.any { signCapableFlags.contains(it) } ?: false
         }
     }
 }

pgpainless-core/src/main/kotlin/org/pgpainless/signature/builder/AbstractSignatureBuilder.kt

@@ -6,6 +6,7 @@ package org.pgpainless.signature.builder
 
 import java.util.function.Predicate
 import org.bouncycastle.openpgp.PGPException
+import org.bouncycastle.openpgp.PGPKeyPair
 import org.bouncycastle.openpgp.PGPPrivateKey
 import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPSecretKey
@@ -53,6 +54,27 @@ abstract class AbstractSignatureBuilder<B : AbstractSignatureBuilder<B>>(
         hashedSubpackets,
         unhashedSubpackets)
 
+    @Throws(PGPException::class)
+    constructor(
+        signatureType: SignatureType,
+        signingKey: PGPKeyPair,
+        hashAlgorithm: HashAlgorithm,
+        hashedSubpackets: SignatureSubpackets,
+        unhashedSubpackets: SignatureSubpackets
+    ) : this(
+        signingKey.privateKey,
+        signingKey.publicKey,
+        hashAlgorithm,
+        signatureType,
+        hashedSubpackets,
+        unhashedSubpackets)
+
+    @Throws(PGPException::class)
+    constructor(
+        signingKey: PGPKeyPair,
+        archetypeSignature: PGPSignature
+    ) : this(signingKey.privateKey, signingKey.publicKey, archetypeSignature)
+
     @Throws(PGPException::class)
     constructor(
         privateSigningKey: PGPPrivateKey,

pgpainless-core/src/main/kotlin/org/pgpainless/signature/builder/DirectKeySelfSignatureBuilder.kt

@@ -6,6 +6,7 @@ package org.pgpainless.signature.builder
 
 import java.util.function.Predicate
 import org.bouncycastle.openpgp.PGPException
+import org.bouncycastle.openpgp.PGPKeyPair
 import org.bouncycastle.openpgp.PGPPrivateKey
 import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPSecretKey
@@ -32,6 +33,12 @@ class DirectKeySelfSignatureBuilder : AbstractSignatureBuilder<DirectKeySelfSign
         archetypeSignature: PGPSignature
     ) : super(signingKey, protector, archetypeSignature)
 
+    @Throws(PGPException::class)
+    constructor(
+        signingKey: PGPKeyPair,
+        hashAlgorithm: HashAlgorithm
+    ) : this(signingKey.privateKey, signingKey.publicKey, hashAlgorithm)
+
     @Throws(PGPException::class)
     constructor(
         privateSigningKey: PGPPrivateKey,

pgpainless-core/src/main/kotlin/org/pgpainless/signature/builder/PrimaryKeyBindingSignatureBuilder.kt

@@ -6,6 +6,7 @@ package org.pgpainless.signature.builder
 
 import java.util.function.Predicate
 import org.bouncycastle.openpgp.PGPException
+import org.bouncycastle.openpgp.PGPKeyPair
 import org.bouncycastle.openpgp.PGPPrivateKey
 import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPSecretKey
@@ -33,6 +34,13 @@ class PrimaryKeyBindingSignatureBuilder :
         subkeyProtector: SecretKeyRingProtector
     ) : super(SignatureType.PRIMARYKEY_BINDING, signingSubkey, subkeyProtector)
 
+    @Throws(PGPException::class)
+    constructor(
+        subkey: PGPKeyPair,
+        hashAlgorithm: HashAlgorithm
+    ) : this(subkey.privateKey, subkey.publicKey, hashAlgorithm)
+
+    @Throws(PGPException::class)
     constructor(
         privateSubkey: PGPPrivateKey,
         publicSubkey: PGPPublicKey,
@@ -71,4 +79,7 @@ class PrimaryKeyBindingSignatureBuilder :
     @Throws(PGPException::class)
     fun build(primaryKey: PGPPublicKey): PGPSignature =
         buildAndInitSignatureGenerator().generateCertification(primaryKey, publicSigningKey)
+
+    @Throws(PGPException::class)
+    fun build(primaryKey: PGPKeyPair): PGPSignature = build(primaryKey.publicKey)
 }

pgpainless-core/src/main/kotlin/org/pgpainless/signature/builder/RevocationSignatureBuilder.kt

@@ -6,12 +6,15 @@ package org.pgpainless.signature.builder
 
 import java.util.function.Predicate
 import org.bouncycastle.openpgp.PGPException
+import org.bouncycastle.openpgp.PGPKeyPair
 import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPSecretKey
 import org.bouncycastle.openpgp.PGPSignature
+import org.pgpainless.algorithm.HashAlgorithm
 import org.pgpainless.algorithm.SignatureType
 import org.pgpainless.key.protection.SecretKeyRingProtector
 import org.pgpainless.signature.subpackets.RevocationSignatureSubpackets
+import org.pgpainless.signature.subpackets.SignatureSubpackets
 
 /** [AbstractSignatureBuilder] subclass devoted to revocation signatures. */
 class RevocationSignatureBuilder : AbstractSignatureBuilder<RevocationSignatureBuilder> {
@@ -26,6 +29,18 @@ class RevocationSignatureBuilder : AbstractSignatureBuilder<RevocationSignatureB
                         SignatureType.CERTIFICATION_REVOCATION)
             }
 
+    @Throws(PGPException::class)
+    constructor(
+        signatureType: SignatureType,
+        signingKey: PGPKeyPair,
+        hashAlgorithm: HashAlgorithm
+    ) : super(
+        signatureType,
+        signingKey,
+        hashAlgorithm,
+        SignatureSubpackets.createHashedSubpackets(signingKey.publicKey),
+        SignatureSubpackets.createEmptySubpackets())
+
     @Throws(PGPException::class)
     constructor(
         signatureType: SignatureType,
@@ -45,6 +60,9 @@ class RevocationSignatureBuilder : AbstractSignatureBuilder<RevocationSignatureB
         }
     }
 
+    @Throws(PGPException::class)
+    fun build(revokeeKey: PGPKeyPair): PGPSignature = build(revokeeKey.publicKey)
+
     @Throws(PGPException::class)
     fun build(revokeeKey: PGPPublicKey): PGPSignature =
         buildAndInitSignatureGenerator().let {

pgpainless-core/src/main/kotlin/org/pgpainless/signature/builder/SelfSignatureBuilder.kt

@@ -6,6 +6,7 @@ package org.pgpainless.signature.builder
 
 import java.util.function.Predicate
 import org.bouncycastle.openpgp.PGPException
+import org.bouncycastle.openpgp.PGPKeyPair
 import org.bouncycastle.openpgp.PGPPrivateKey
 import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPSecretKey
@@ -53,6 +54,12 @@ class SelfSignatureBuilder : AbstractSignatureBuilder<SelfSignatureBuilder> {
         oldCertification: PGPSignature
     ) : super(primaryKey, primaryKeyProtector, oldCertification)
 
+    @Throws(PGPException::class)
+    constructor(
+        primaryKey: PGPKeyPair,
+        oldCertification: PGPSignature
+    ) : this(primaryKey.privateKey, primaryKey.publicKey, oldCertification)
+
     @Throws(PGPException::class)
     constructor(
         privatePrimaryKey: PGPPrivateKey,
@@ -60,6 +67,13 @@ class SelfSignatureBuilder : AbstractSignatureBuilder<SelfSignatureBuilder> {
         oldCertification: PGPSignature
     ) : super(privatePrimaryKey, publicPrimaryKey, oldCertification)
 
+    @Throws(PGPException::class)
+    constructor(
+        primaryKey: PGPKeyPair,
+        signatureType: SignatureType = SignatureType.POSITIVE_CERTIFICATION,
+        hashAlgorithm: HashAlgorithm
+    ) : this(primaryKey.privateKey, primaryKey.publicKey, signatureType, hashAlgorithm)
+
     @Throws(PGPException::class)
     constructor(
         privatePrimaryKey: PGPPrivateKey,

pgpainless-core/src/main/kotlin/org/pgpainless/signature/builder/SubkeyBindingSignatureBuilder.kt

@@ -6,6 +6,7 @@ package org.pgpainless.signature.builder
 
 import java.util.function.Predicate
 import org.bouncycastle.openpgp.PGPException
+import org.bouncycastle.openpgp.PGPKeyPair
 import org.bouncycastle.openpgp.PGPPrivateKey
 import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPSecretKey
@@ -25,6 +26,12 @@ class SubkeyBindingSignatureBuilder : AbstractSignatureBuilder<SubkeyBindingSign
     override val signatureTypePredicate: Predicate<SignatureType>
         get() = Predicate<SignatureType> { it == SignatureType.SUBKEY_BINDING }
 
+    @Throws(PGPException::class)
+    constructor(
+        signingKey: PGPKeyPair,
+        hashAlgorithm: HashAlgorithm = negotiateHashAlgorithm(signingKey.publicKey)
+    ) : this(signingKey.privateKey, signingKey.publicKey, hashAlgorithm)
+
     @Throws(PGPException::class)
     constructor(
         signingKey: PGPPrivateKey,
@@ -84,4 +91,7 @@ class SubkeyBindingSignatureBuilder : AbstractSignatureBuilder<SubkeyBindingSign
     @Throws(PGPException::class)
     fun build(subkey: PGPPublicKey): PGPSignature =
         buildAndInitSignatureGenerator().generateCertification(publicSigningKey, subkey)
+
+    @Throws(PGPException::class)
+    fun build(subkey: PGPKeyPair): PGPSignature = build(subkey.publicKey)
 }