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38 lines
1.7 KiB
Kotlin
38 lines
1.7 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.bouncycastle.extensions
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import org.bouncycastle.asn1.gnu.GNUObjectIdentifiers
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import org.bouncycastle.bcpg.ECDHPublicBCPGKey
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import org.bouncycastle.bcpg.ECDSAPublicBCPGKey
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import org.bouncycastle.bcpg.EdDSAPublicBCPGKey
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import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil
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import org.bouncycastle.openpgp.PGPPublicKey
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import org.pgpainless.algorithm.PublicKeyAlgorithm
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import org.pgpainless.key.generation.type.eddsa.EdDSACurve
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/**
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* For secret keys of types [PublicKeyAlgorithm.ECDSA], [PublicKeyAlgorithm.ECDH] and [PublicKeyAlgorithm.EDDSA],
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* this method returns the name of the underlying elliptic curve.
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*
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* For other key types or unknown curves, this method throws an [IllegalArgumentException].
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*
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* @return curve name
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*/
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fun PGPPublicKey.getCurveName(): String {
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PublicKeyAlgorithm.requireFromId(algorithm)
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.let {
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when (it) {
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PublicKeyAlgorithm.ECDSA -> publicKeyPacket.key as ECDSAPublicBCPGKey
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PublicKeyAlgorithm.ECDH -> publicKeyPacket.key as ECDHPublicBCPGKey
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PublicKeyAlgorithm.EDDSA -> publicKeyPacket.key as EdDSAPublicBCPGKey
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else -> throw IllegalArgumentException("No an elliptic curve public key ($it).")
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}
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}
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.let { if (it.curveOID == GNUObjectIdentifiers.Ed25519) return EdDSACurve._Ed25519.curveName else it.curveOID}
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.let { it to ECUtil.getCurveName(it) }
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.let { if (it.second != null) return it.second else throw IllegalArgumentException("Unknown curve: ${it.first}") }
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}
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