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Initial implementation of OpenPGP EdDSA and usage of the Curve25519 in ECDH #282

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Initial implementation of OpenPGP EdDSA and usage of the Curve25519 in ECDH #282

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b5f5057
Initial implementation of OpenPGP EdDSA and usage of the Curve25519 i…
filipnavara Dec 4, 2020
a52b34b
Add unit test for EdDSA, update S Expression parser to support more o…
filipnavara Dec 11, 2020
9f98e0c
Rename SXprUtilities to SXprReader
filipnavara Dec 13, 2020
5fba3f4
Fix endianness issue and key generation in ECDH
filipnavara Dec 13, 2020
b4aed35
Add roundtrip test for X25519 with GnuPG keys
filipnavara Dec 13, 2020
31c4655
Fix namespace
filipnavara Jun 23, 2021
be112f4
Fix build
filipnavara Jun 23, 2021
8cbf92d
Add missing file
Jul 14, 2021
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4 changes: 3 additions & 1 deletion crypto/BouncyCastle.Android.csproj
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Expand Up @@ -1057,6 +1057,7 @@
<Compile Include="src\crypto\signers\Ed25519Signer.cs" />
<Compile Include="src\crypto\signers\Ed448phSigner.cs" />
<Compile Include="src\crypto\signers\Ed448Signer.cs" />
<Compile Include="src\crypto\signers\EdDsa25519Signer.cs" />
<Compile Include="src\crypto\signers\GOST3410DigestSigner.cs" />
<Compile Include="src\crypto\signers\GOST3410Signer.cs" />
<Compile Include="src\crypto\signers\GenericSigner.cs" />
Expand Down Expand Up @@ -1486,7 +1487,8 @@
<Compile Include="src\openpgp\PgpUtilities.cs" />
<Compile Include="src\openpgp\PgpV3SignatureGenerator.cs" />
<Compile Include="src\openpgp\Rfc6637Utilities.cs" />
<Compile Include="src\openpgp\SXprUtilities.cs" />
<Compile Include="src\openpgp\SXprReader.cs" />
<Compile Include="src\openpgp\SXprWriter.cs" />
<Compile Include="src\openpgp\WrappedGeneratorStream.cs" />
<Compile Include="src\openssl\EncryptionException.cs" />
<Compile Include="src\openssl\IPasswordFinder.cs" />
Expand Down
4 changes: 3 additions & 1 deletion crypto/BouncyCastle.csproj
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Expand Up @@ -1051,6 +1051,7 @@
<Compile Include="src\crypto\signers\Ed25519Signer.cs" />
<Compile Include="src\crypto\signers\Ed448phSigner.cs" />
<Compile Include="src\crypto\signers\Ed448Signer.cs" />
<Compile Include="src\crypto\signers\EdDsa25519Signer.cs" />
<Compile Include="src\crypto\signers\GOST3410DigestSigner.cs" />
<Compile Include="src\crypto\signers\GOST3410Signer.cs" />
<Compile Include="src\crypto\signers\GenericSigner.cs" />
Expand Down Expand Up @@ -1480,7 +1481,8 @@
<Compile Include="src\openpgp\PgpUtilities.cs" />
<Compile Include="src\openpgp\PgpV3SignatureGenerator.cs" />
<Compile Include="src\openpgp\Rfc6637Utilities.cs" />
<Compile Include="src\openpgp\SXprUtilities.cs" />
<Compile Include="src\openpgp\SXprReader.cs" />
<Compile Include="src\openpgp\SXprWriter.cs" />
<Compile Include="src\openpgp\WrappedGeneratorStream.cs" />
<Compile Include="src\openssl\EncryptionException.cs" />
<Compile Include="src\openssl\IPasswordFinder.cs" />
Expand Down
4 changes: 3 additions & 1 deletion crypto/BouncyCastle.iOS.csproj
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Expand Up @@ -1052,6 +1052,7 @@
<Compile Include="src\crypto\signers\Ed25519Signer.cs" />
<Compile Include="src\crypto\signers\Ed448phSigner.cs" />
<Compile Include="src\crypto\signers\Ed448Signer.cs" />
<Compile Include="src\crypto\signers\EdDsa25519Signer.cs" />
<Compile Include="src\crypto\signers\GOST3410DigestSigner.cs" />
<Compile Include="src\crypto\signers\GOST3410Signer.cs" />
<Compile Include="src\crypto\signers\GenericSigner.cs" />
Expand Down Expand Up @@ -1481,7 +1482,8 @@
<Compile Include="src\openpgp\PgpUtilities.cs" />
<Compile Include="src\openpgp\PgpV3SignatureGenerator.cs" />
<Compile Include="src\openpgp\Rfc6637Utilities.cs" />
<Compile Include="src\openpgp\SXprUtilities.cs" />
<Compile Include="src\openpgp\SXprReader.cs" />
<Compile Include="src\openpgp\SXprWriter.cs" />
<Compile Include="src\openpgp\WrappedGeneratorStream.cs" />
<Compile Include="src\openssl\EncryptionException.cs" />
<Compile Include="src\openssl\IPasswordFinder.cs" />
Expand Down
12 changes: 11 additions & 1 deletion crypto/crypto.csproj
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Expand Up @@ -5143,6 +5143,11 @@
SubType = "Code"
BuildAction = "Compile"
/>
<File
RelPath = "src\crypto\signers\EdDsa25519Signer.cs"
SubType = "Code"
BuildAction = "Compile"
/>
<File
RelPath = "src\crypto\signers\GenericSigner.cs"
SubType = "Code"
Expand Down Expand Up @@ -7289,7 +7294,12 @@
BuildAction = "Compile"
/>
<File
RelPath = "src\openpgp\SXprUtilities.cs"
RelPath = "src\openpgp\SXprReader.cs"
SubType = "Code"
BuildAction = "Compile"
/>
<File
RelPath = "src\openpgp\SXprWriter.cs"
SubType = "Code"
BuildAction = "Compile"
/>
Expand Down
6 changes: 3 additions & 3 deletions crypto/src/asn1/gnu/GNUObjectIdentifiers.cs
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Expand Up @@ -28,9 +28,9 @@ public abstract class GnuObjectIdentifiers
public static readonly DerObjectIdentifier Crc = new DerObjectIdentifier("1.3.6.1.4.1.11591.14"); // CRC algorithms
public static readonly DerObjectIdentifier Crc32 = new DerObjectIdentifier("1.3.6.1.4.1.11591.14.1"); // CRC 32

/** 1.3.6.1.4.1.11591.15 - ellipticCurve */
public static readonly DerObjectIdentifier EllipticCurve = new DerObjectIdentifier("1.3.6.1.4.1.11591.15");
/** 1.3.6.1.4.1.11591.15 - ellipticCurve */
public static readonly DerObjectIdentifier EllipticCurve = new DerObjectIdentifier("1.3.6.1.4.1.11591.15");

public static readonly DerObjectIdentifier Ed25519 = EllipticCurve.Branch("1");
public static readonly DerObjectIdentifier Ed25519 = EllipticCurve.Branch("1");
}
}
3 changes: 3 additions & 0 deletions crypto/src/asn1/misc/MiscObjectIdentifiers.cs
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Expand Up @@ -74,6 +74,9 @@ public abstract class MiscObjectIdentifiers
public static readonly DerObjectIdentifier cryptlib_algorithm_blowfish_CFB = cryptlib_algorithm.Branch("1.3");
public static readonly DerObjectIdentifier cryptlib_algorithm_blowfish_OFB = cryptlib_algorithm.Branch("1.4");

// OpenPGP (draft-ietf-openpgp-rfc4880bis-10)
public static readonly DerObjectIdentifier Curve25519 = cryptlib_algorithm.Branch("5.1");

//
// Blake2b
//
Expand Down
16 changes: 16 additions & 0 deletions crypto/src/bcpg/ECDHPublicBCPGKey.cs
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@@ -1,6 +1,7 @@
using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;

namespace Org.BouncyCastle.Bcpg
Expand Down Expand Up @@ -48,6 +49,21 @@ public ECDHPublicBcpgKey(
VerifySymmetricKeyAlgorithm();
}

public ECDHPublicBcpgKey(
DerObjectIdentifier oid,
BigInteger encodedPoint,
HashAlgorithmTag hashAlgorithm,
SymmetricKeyAlgorithmTag symmetricKeyAlgorithm)
: base(oid, encodedPoint)
{
reserved = 1;
hashFunctionId = hashAlgorithm;
symAlgorithmId = symmetricKeyAlgorithm;

VerifyHashAlgorithm();
VerifySymmetricKeyAlgorithm();
}

public virtual byte Reserved
{
get { return reserved; }
Expand Down
1 change: 1 addition & 0 deletions crypto/src/bcpg/PublicKeyPacket.cs
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Expand Up @@ -48,6 +48,7 @@ internal PublicKeyPacket(
key = new ECDHPublicBcpgKey(bcpgIn);
break;
case PublicKeyAlgorithmTag.ECDsa:
case PublicKeyAlgorithmTag.EdDsa:
key = new ECDsaPublicBcpgKey(bcpgIn);
break;
default:
Expand Down
1 change: 1 addition & 0 deletions crypto/src/bcpg/SignaturePacket.cs
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Expand Up @@ -147,6 +147,7 @@ internal SignaturePacket(
signature = new MPInteger[]{ p, g, y };
break;
case PublicKeyAlgorithmTag.ECDsa:
case PublicKeyAlgorithmTag.EdDsa:
MPInteger ecR = new MPInteger(bcpgIn);
MPInteger ecS = new MPInteger(bcpgIn);
signature = new MPInteger[]{ ecR, ecS };
Expand Down
5 changes: 4 additions & 1 deletion crypto/src/crypto/ec/CustomNamedCurves.cs
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Expand Up @@ -3,6 +3,8 @@

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.GM;
using Org.BouncyCastle.Asn1.Gnu;
using Org.BouncyCastle.Asn1.Misc;
using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Math;
Expand Down Expand Up @@ -789,7 +791,8 @@ private static void DefineCurveAlias(string name, DerObjectIdentifier oid)

static CustomNamedCurves()
{
DefineCurve("curve25519", Curve25519Holder.Instance);
DefineCurveWithOid("ed25519", GnuObjectIdentifiers.Ed25519, Curve25519Holder.Instance);
DefineCurveWithOid("curve25519", MiscObjectIdentifiers.Curve25519, Curve25519Holder.Instance);

//DefineCurveWithOid("secp112r1", SecObjectIdentifiers.SecP112r1, SecP112R1Holder.Instance);
//DefineCurveWithOid("secp112r2", SecObjectIdentifiers.SecP112r2, SecP112R2Holder.Instance);
Expand Down
47 changes: 47 additions & 0 deletions crypto/src/crypto/signers/EdDsa25519Signer.cs
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@@ -0,0 +1,47 @@
using System;

using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Crypto.Signers
{
public class EdDsa22519Signer : IDsa
{
private Ed25519Signer signer;

public virtual string AlgorithmName => "EDDSA";

public EdDsa22519Signer()
{
signer = new Ed25519Signer();
}

public virtual void Init(bool forSigning, ICipherParameters parameters)
{
signer.Init(forSigning, parameters);
}

public virtual BigInteger[] GenerateSignature(byte[] message)
{
signer.BlockUpdate(message, 0, message.Length);
byte[] sigBytes = signer.GenerateSignature();
byte[] rBytes = new byte[32];
Array.Copy(sigBytes, rBytes, 32);
byte[] sBytes = new byte[sigBytes.Length - 32];
Array.Copy(sigBytes, 32, sBytes, 0, sigBytes.Length - 32);
BigInteger r = new BigInteger(1, rBytes);
BigInteger s = new BigInteger(1, sBytes);
return new BigInteger[2] { r, s };
}

public virtual bool VerifySignature(byte[] message, BigInteger r, BigInteger s)
{
signer.BlockUpdate(message, 0, message.Length);
byte[] rBytes = r.ToByteArrayUnsigned();
byte[] sBytes = s.ToByteArrayUnsigned();
byte[] sigBytes = new byte[64];
Array.Copy(rBytes, 0, sigBytes, 32 - rBytes.Length, rBytes.Length);
Array.Copy(sBytes, 0, sigBytes, 64 - sBytes.Length, sBytes.Length);
return signer.VerifySignature(sigBytes);
}
}
}
50 changes: 37 additions & 13 deletions crypto/src/openpgp/PgpEncryptedDataGenerator.cs
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Expand Up @@ -3,13 +3,15 @@
using System.Diagnostics;
using System.IO;

using Org.BouncyCastle.Asn1.Misc;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.IO;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Math.EC.Rfc7748;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;

Expand Down Expand Up @@ -102,10 +104,12 @@ public override void AddSessionInfo(

private byte[] EncryptSessionInfo(byte[] sessionInfo, SecureRandom random)
{
AsymmetricKeyParameter akp = pubKey.GetKey();

if (pubKey.Algorithm != PublicKeyAlgorithmTag.ECDH)
{
IBufferedCipher c;
switch (pubKey.Algorithm)
switch (pubKey.Algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaGeneral:
Expand All @@ -119,37 +123,57 @@ private byte[] EncryptSessionInfo(byte[] sessionInfo, SecureRandom random)
throw new PgpException("Can't use DSA for encryption.");
case PublicKeyAlgorithmTag.ECDsa:
throw new PgpException("Can't use ECDSA for encryption.");
case PublicKeyAlgorithmTag.EdDsa:
throw new PgpException("Can't use EdDSA for encryption.");
default:
throw new PgpException("unknown asymmetric algorithm: " + pubKey.Algorithm);
}

AsymmetricKeyParameter akp = pubKey.GetKey();
c.Init(true, new ParametersWithRandom(akp, random));
c.Init(true, new ParametersWithRandom(akp, random));
return c.DoFinal(sessionInfo);
}

ECDHPublicBcpgKey ecKey = (ECDHPublicBcpgKey)pubKey.PublicKeyPacket.Key;
KeyParameter key;
byte[] encodedPublicKey;

// Generate the ephemeral key pair
IAsymmetricCipherKeyPairGenerator gen = GeneratorUtilities.GetKeyPairGenerator("ECDH");
gen.Init(new ECKeyGenerationParameters(ecKey.CurveOid, random));
if (akp is X25519PublicKeyParameters)
{
X25519PublicKeyParameters pub = (X25519PublicKeyParameters)akp;
byte[] privateKey = new byte[X25519.PointSize];
X25519.GeneratePrivateKey(random, privateKey);
byte[] sharedKey = new byte[32];
X25519.CalculateAgreement(privateKey, 0, pub.GetEncoded(), 0, sharedKey, 0);
byte[] publicKey = new byte[X25519.PointSize + 1];
publicKey[0] = 0x40; // compressed point
X25519.GeneratePublicKey(privateKey, 0, publicKey, 1);
encodedPublicKey = publicKey;
key = new KeyParameter(Rfc6637Utilities.CreateKey(pubKey.PublicKeyPacket, sharedKey));
}
else
{
// Generate the ephemeral key pair
IAsymmetricCipherKeyPairGenerator gen = GeneratorUtilities.GetKeyPairGenerator("ECDH");
gen.Init(new ECKeyGenerationParameters(ecKey.CurveOid, random));

AsymmetricCipherKeyPair ephKp = gen.GenerateKeyPair();
ECPrivateKeyParameters ephPriv = (ECPrivateKeyParameters)ephKp.Private;
ECPublicKeyParameters ephPub = (ECPublicKeyParameters)ephKp.Public;
AsymmetricCipherKeyPair ephKp = gen.GenerateKeyPair();
ECPrivateKeyParameters ephPriv = (ECPrivateKeyParameters)ephKp.Private;
ECPublicKeyParameters ephPub = (ECPublicKeyParameters)ephKp.Public;

ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey.GetKey();
ECPoint S = pub.Q.Multiply(ephPriv.D).Normalize();
ECPublicKeyParameters pub = (ECPublicKeyParameters)akp;
ECPoint S = pub.Q.Multiply(ephPriv.D).Normalize();

KeyParameter key = new KeyParameter(Rfc6637Utilities.CreateKey(pubKey.PublicKeyPacket, S));
key = new KeyParameter(Rfc6637Utilities.CreateKey(pubKey.PublicKeyPacket, S));
encodedPublicKey = ephPub.Q.GetEncoded(false);
}

IWrapper w = PgpUtilities.CreateWrapper(ecKey.SymmetricKeyAlgorithm);
w.Init(true, new ParametersWithRandom(key, random));

byte[] paddedSessionData = PgpPad.PadSessionData(sessionInfo, sessionKeyObfuscation);

byte[] C = w.Wrap(paddedSessionData, 0, paddedSessionData.Length);
byte[] VB = new MPInteger(new BigInteger(1, ephPub.Q.GetEncoded(false))).GetEncoded();
byte[] VB = new MPInteger(new BigInteger(1, encodedPublicKey)).GetEncoded();

byte[] rv = new byte[VB.Length + 1 + C.Length];

Expand Down
39 changes: 37 additions & 2 deletions crypto/src/openpgp/PgpPublicKey.cs
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@@ -1,7 +1,8 @@
using System;
using System.Collections;
using System.IO;

using Org.BouncyCastle.Asn1.Gnu;
using Org.BouncyCastle.Asn1.Misc;
using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
Expand All @@ -10,6 +11,8 @@
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Math.EC.Rfc7748;
using Org.BouncyCastle.Math.EC.Rfc8032;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
Expand Down Expand Up @@ -177,11 +180,35 @@ public PgpPublicKey(
{
bcpgKey = new ECDsaPublicBcpgKey(ecK.PublicKeyParamSet, ecK.Q);
}
else if (algorithm == PublicKeyAlgorithmTag.EdDsa)
{
bcpgKey = new ECDsaPublicBcpgKey(ecK.PublicKeyParamSet, ecK.Q);
}
else
{
throw new PgpException("unknown EC algorithm");
}
}
else if (pubKey is Ed25519PublicKeyParameters)
{
Ed25519PublicKeyParameters ecK = (Ed25519PublicKeyParameters)pubKey;
byte[] encodedPoint = new byte[Ed25519.PublicKeySize + 1];
encodedPoint[0] = 0x40;
ecK.Encode(encodedPoint, 1);
bcpgKey = new ECDsaPublicBcpgKey(GnuObjectIdentifiers.Ed25519, new BigInteger(1, encodedPoint));
}
else if (pubKey is X25519PublicKeyParameters)
{
X25519PublicKeyParameters ecK = (X25519PublicKeyParameters)pubKey;
byte[] encodedPoint = new byte[X25519.PointSize + 1];
encodedPoint[0] = 0x40;
ecK.Encode(encodedPoint, 1);
bcpgKey = new ECDHPublicBcpgKey(
MiscObjectIdentifiers.Curve25519,
new BigInteger(1, encodedPoint),
HashAlgorithmTag.Sha256,
SymmetricKeyAlgorithmTag.Aes128);
}
else if (pubKey is ElGamalPublicKeyParameters)
{
ElGamalPublicKeyParameters eK = (ElGamalPublicKeyParameters) pubKey;
Expand Down Expand Up @@ -495,7 +522,15 @@ public AsymmetricKeyParameter GetKey()
case PublicKeyAlgorithmTag.ECDsa:
return GetECKey("ECDSA");
case PublicKeyAlgorithmTag.ECDH:
return GetECKey("ECDH");
if (((ECPublicBcpgKey)publicPk.Key).CurveOid.Id.Equals(MiscObjectIdentifiers.Curve25519.Id))
{
byte[] encodedPoint = ((ECPublicBcpgKey)publicPk.Key).EncodedPoint.ToByteArrayUnsigned();
return new X25519PublicKeyParameters(encodedPoint, 1);
}
else
return GetECKey("ECDH");
case PublicKeyAlgorithmTag.EdDsa:
return new Ed25519PublicKeyParameters(((ECPublicBcpgKey)publicPk.Key).EncodedPoint.ToByteArrayUnsigned(), 1);
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
ElGamalPublicBcpgKey elK = (ElGamalPublicBcpgKey)publicPk.Key;
Expand Down
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