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Abstract DKIM/ARC support into interfaces
The idea here is to provide the DKIM interfaces in the core MimeKit package, but provide the BouncyCastle implementation of said interfaces in a future MimeKit.Cryptography package. Partial fix for issue #820
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // | ||
| // BouncyCastleDkimKey.cs | ||
| // | ||
| // Author: Jeffrey Stedfast <[email protected]> | ||
| // | ||
| // Copyright (c) 2013-2024 .NET Foundation and Contributors | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| // | ||
|
|
||
| using System; | ||
|
|
||
| using Org.BouncyCastle.Crypto; | ||
| using Org.BouncyCastle.Crypto.Digests; | ||
| using Org.BouncyCastle.Crypto.Signers; | ||
|
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| namespace MimeKit.Cryptography { | ||
| /// <summary> | ||
| /// A base class for <see cref="BouncyCastleDkimPublicKey"/> and <see cref="BouncyCastleDkimPrivateKey" />. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// A base class for <see cref="BouncyCastleDkimPublicKey"/> and <see cref="BouncyCastleDkimPrivateKey" />. | ||
| /// </remarks> | ||
| public abstract class BouncyCastleDkimKey | ||
| { | ||
| /// <summary> | ||
| /// Get the private key. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Gets the private key. | ||
| /// </remarks> | ||
| public AsymmetricKeyParameter Key { | ||
| get; protected set; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Create a DKIM signature context. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Creates a DKIM signature context. | ||
| /// </remarks> | ||
| /// <param name="algorithm">The DKIM signature algorithm.</param> | ||
| /// <param name="sign">If set to <c>true</c>, the context will be used for signing; otherwise, it will be used for verifying.</param> | ||
| /// <returns>The DKIM signature context.</returns> | ||
| /// <exception cref="NotSupportedException"> | ||
| /// The specified <paramref name="algorithm"/> is not supported. | ||
| /// </exception> | ||
| protected IDkimSignatureContext CreateSignatureContext (DkimSignatureAlgorithm algorithm, bool sign) | ||
| { | ||
| ISigner signer; | ||
|
|
||
| switch (algorithm) { | ||
| case DkimSignatureAlgorithm.RsaSha1: | ||
| signer = new RsaDigestSigner (new Sha1Digest ()); | ||
| break; | ||
| case DkimSignatureAlgorithm.RsaSha256: | ||
| signer = new RsaDigestSigner (new Sha256Digest ()); | ||
| break; | ||
| case DkimSignatureAlgorithm.Ed25519Sha256: | ||
| signer = new Ed25519DigestSigner (new Sha256Digest ()); | ||
| break; | ||
| default: | ||
| throw new NotSupportedException ($"{algorithm} is not supported."); | ||
| } | ||
|
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| signer.Init (sign, Key); | ||
|
|
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| return new BouncyCastleDkimSignatureContext (signer); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| // | ||
| // BouncyCastleDkimPrivateKey.cs | ||
| // | ||
| // Author: Jeffrey Stedfast <[email protected]> | ||
| // | ||
| // Copyright (c) 2013-2024 .NET Foundation and Contributors | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| // | ||
|
|
||
| using System; | ||
| using System.IO; | ||
|
|
||
| using Org.BouncyCastle.Crypto; | ||
| using Org.BouncyCastle.OpenSsl; | ||
|
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| namespace MimeKit.Cryptography { | ||
| /// <summary> | ||
| /// A DKIM private key implemented using BouncyCastle. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// A DKIM private key implemented using BouncyCastle. | ||
| /// </remarks> | ||
| public class BouncyCastleDkimPrivateKey : BouncyCastleDkimKey, IDkimPrivateKey | ||
| { | ||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="BouncyCastleDkimPrivateKey"/> class. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Creates a new <see cref="BouncyCastleDkimPrivateKey"/>. | ||
| /// </remarks> | ||
| /// <param name="key">The private key.</param> | ||
| /// <exception cref="System.ArgumentNullException"> | ||
| /// <paramref name="key"/> is <c>null</c>. | ||
| /// </exception> | ||
| /// <exception cref="System.ArgumentException"> | ||
| /// <paramref name="key"/> is not a private key. | ||
| /// </exception> | ||
| public BouncyCastleDkimPrivateKey (AsymmetricKeyParameter key) | ||
| { | ||
| if (key is null) | ||
| throw new ArgumentNullException (nameof (key)); | ||
|
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| if (!key.IsPrivate) | ||
| throw new ArgumentException ("The key must be a private key.", nameof (key)); | ||
|
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| Key = key; | ||
| } | ||
|
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| /// <summary> | ||
| /// Create a DKIM signature context suitable for signing. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Creates a DKIM signature context suitable for signing. | ||
| /// </remarks> | ||
| /// <param name="algorithm">The DKIM signature algorithm.</param> | ||
| /// <returns>The DKIM signature context.</returns> | ||
| /// <exception cref="System.NotSupportedException"> | ||
| /// The specified <paramref name="algorithm"/> is not supported. | ||
| /// </exception> | ||
| public IDkimSignatureContext CreateSigningContext (DkimSignatureAlgorithm algorithm) | ||
| { | ||
| return CreateSignatureContext (algorithm, true); | ||
| } | ||
|
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| static AsymmetricKeyParameter LoadPrivateKey (Stream stream) | ||
| { | ||
| AsymmetricKeyParameter key = null; | ||
|
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| using (var reader = new StreamReader (stream)) { | ||
| var pem = new PemReader (reader); | ||
|
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| var keyObject = pem.ReadObject (); | ||
|
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| if (keyObject is AsymmetricCipherKeyPair pair) { | ||
| key = pair.Private; | ||
| } else if (keyObject is AsymmetricKeyParameter param) { | ||
| key = param; | ||
| } | ||
| } | ||
|
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| if (key == null || !key.IsPrivate) | ||
| throw new FormatException ("Private key not found."); | ||
|
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| return key; | ||
| } | ||
|
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| /// <summary> | ||
| /// Load a private key from the specified stream. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Loads a private key from the specified stream. | ||
| /// </remarks> | ||
| /// <param name="stream">A stream containing the private DKIM key data.</param> | ||
| /// <returns>A <see cref="BouncyCastleDkimPrivateKey"/>.</returns> | ||
| /// <exception cref="System.ArgumentNullException"> | ||
| /// <paramref name="stream"/> is <c>null</c>. | ||
| /// </exception> | ||
| /// <exception cref="System.FormatException"> | ||
| /// The stream did not contain a private key in PEM format. | ||
| /// </exception> | ||
| /// <exception cref="System.IO.IOException"> | ||
| /// An I/O error occurred. | ||
| /// </exception> | ||
| public static BouncyCastleDkimPrivateKey Load (Stream stream) | ||
| { | ||
| if (stream is null) | ||
| throw new ArgumentNullException (nameof (stream)); | ||
|
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| var key = LoadPrivateKey (stream); | ||
|
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| return new BouncyCastleDkimPrivateKey (key); | ||
| } | ||
|
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| /// <summary> | ||
| /// Load a private key from the specified file. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Loads a private key from the specified file. | ||
| /// </remarks> | ||
| /// <param name="fileName">A file containing the private DKIM key data.</param> | ||
| /// <returns>A <see cref="BouncyCastleDkimPrivateKey"/>.</returns> | ||
| /// <exception cref="System.ArgumentNullException"> | ||
| /// <paramref name="fileName"/> is <c>null</c>. | ||
| /// </exception> | ||
| /// <exception cref="System.FormatException"> | ||
| /// The stream did not contain a private key in PEM format. | ||
| /// </exception> | ||
| /// <exception cref="System.IO.IOException"> | ||
| /// An I/O error occurred. | ||
| /// </exception> | ||
| public static BouncyCastleDkimPrivateKey Load (string fileName) | ||
| { | ||
| if (fileName is null) | ||
| throw new ArgumentNullException (nameof (fileName)); | ||
|
|
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| using (var stream = File.OpenRead (fileName)) | ||
| return Load (stream); | ||
| } | ||
| } | ||
| } |
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