Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Security / Cryptography / ECDsaCng.cs / 1305376 / ECDsaCng.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
using System;
using System.Diagnostics;
using System.IO;
using System.Security;
using System.Security.Permissions;
using System.Diagnostics.Contracts;
using Microsoft.Win32.SafeHandles;
namespace System.Security.Cryptography {
///
/// Wrapper for NCrypt's implementation of elliptic curve DSA
///
[System.Security.Permissions.HostProtection(MayLeakOnAbort = true)]
public sealed class ECDsaCng : ECDsa {
private static KeySizes[] s_legalKeySizes = new KeySizes[] { new KeySizes(256, 384, 128), new KeySizes(521, 521, 0) };
private CngKey m_key;
private CngAlgorithm m_hashAlgorithm = CngAlgorithm.Sha256;
//
// Constructors
//
public ECDsaCng() : this(521) {
Contract.Ensures(LegalKeySizesValue != null);
}
//
//
[System.Security.SecurityCritical]
public ECDsaCng(int keySize) {
Contract.Ensures(LegalKeySizesValue != null);
if (!NCryptNative.NCryptSupported) {
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
LegalKeySizesValue = s_legalKeySizes;
KeySize = keySize;
}
//
//
[System.Security.SecurityCritical]
public ECDsaCng(CngKey key) {
Contract.Ensures(LegalKeySizesValue != null);
Contract.Ensures(m_key != null && m_key.AlgorithmGroup == CngAlgorithmGroup.ECDsa);
if (key == null) {
throw new ArgumentNullException("key");
}
if (key.AlgorithmGroup != CngAlgorithmGroup.ECDsa) {
throw new ArgumentException(SR.GetString(SR.Cryptography_ArgECDsaRequiresECDsaKey), "key");
}
if (!NCryptNative.NCryptSupported) {
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
LegalKeySizesValue = s_legalKeySizes;
// Make a copy of the key so that we continue to work if it gets disposed before this algorithm
//
// This requires an assert for UnmanagedCode since we'll need to access the raw handles of the key
// and the handle constructor of CngKey. The assert is safe since ECDsaCng will never expose the
// key handles to calling code (without first demanding UnmanagedCode via the Handle property of
// CngKey).
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
Key = CngKey.Open(key.Handle, key.IsEphemeral ? CngKeyHandleOpenOptions.EphemeralKey : CngKeyHandleOpenOptions.None);
CodeAccessPermission.RevertAssert();
KeySize = m_key.KeySize;
}
///
/// Hash algorithm to use when generating a signature over arbitrary data
///
public CngAlgorithm HashAlgorithm {
get {
Contract.Ensures(Contract.Result() != null);
return m_hashAlgorithm;
}
set {
Contract.Ensures(m_hashAlgorithm != null);
if (value == null) {
throw new ArgumentNullException("value");
}
m_hashAlgorithm = value;
}
}
///
/// Key to use for signing
///
public CngKey Key {
get {
Contract.Ensures(Contract.Result() != null);
Contract.Ensures(Contract.Result().AlgorithmGroup == CngAlgorithmGroup.ECDsa);
Contract.Ensures(m_key != null && m_key.AlgorithmGroup == CngAlgorithmGroup.ECDsa);
// If the size of the key no longer matches our stored value, then we need to replace it with
// a new key of the correct size.
if (m_key != null && m_key.KeySize != KeySize) {
m_key.Dispose();
m_key = null;
}
if (m_key == null) {
// Map the current key size to a CNG algorithm name
CngAlgorithm algorithm = null;
switch (KeySize) {
case 256:
algorithm = CngAlgorithm.ECDsaP256;
break;
case 384:
algorithm = CngAlgorithm.ECDsaP384;
break;
case 521:
algorithm = CngAlgorithm.ECDsaP521;
break;
default:
Debug.Assert(false, "Illegal key size set");
break;
}
m_key = CngKey.Create(algorithm);
}
return m_key;
}
private set {
Contract.Requires(value != null);
Contract.Ensures(m_key != null && m_key.AlgorithmGroup == CngAlgorithmGroup.ECDsa);
if (value.AlgorithmGroup != CngAlgorithmGroup.ECDsa) {
throw new ArgumentException(SR.GetString(SR.Cryptography_ArgECDsaRequiresECDsaKey));
}
if (m_key != null) {
m_key.Dispose();
}
//
// We do not duplicate the handle because the only time the user has access to the key itself
// to dispose underneath us is when they construct via the CngKey constructor, which does a
// copy. Otherwise all key lifetimes are controlled directly by the ECDsaCng class.
//
m_key = value;
KeySize = m_key.KeySize;
}
}
///
/// Clean up the algorithm
///
protected override void Dispose(bool disposing) {
try {
if (m_key != null) {
m_key.Dispose();
}
}
finally {
base.Dispose(disposing);
}
}
//
// XML Import
//
// #ECCXMLFormat
//
// There is currently not a standard XML format for ECC keys, so we will not implement the default
// To/FromXmlString so that we're not tied to one format when a standard one does exist. Instead we'll
// use an overload which allows the user to specify the format they'd like to serialize into.
//
// See code:System.Security.Cryptography.Rfc4050KeyFormatter#RFC4050ECKeyFormat for information about
// the currently supported format.
//
public override void FromXmlString(string xmlString) {
throw new NotImplementedException(SR.GetString(SR.Cryptography_ECXmlSerializationFormatRequired));
}
public void FromXmlString(string xml, ECKeyXmlFormat format) {
if (xml == null) {
throw new ArgumentNullException("xml");
}
if (format != ECKeyXmlFormat.Rfc4050) {
throw new ArgumentOutOfRangeException("format");
}
Key = Rfc4050KeyFormatter.FromXml(xml);
}
//
// Signature generation
//
public byte[] SignData(byte[] data) {
Contract.Ensures(Contract.Result() != null);
if (data == null) {
throw new ArgumentNullException("data");
}
return SignData(data, 0, data.Length);
}
//
//
[System.Security.SecurityCritical]
public byte[] SignData(byte[] data, int offset, int count) {
Contract.Ensures(Contract.Result() != null);
if (data == null) {
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 || count > data.Length - offset) {
throw new ArgumentOutOfRangeException("count");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashCore(data, offset, count);
byte[] hashValue = hashAlgorithm.HashFinal();
return SignHash(hashValue);
}
}
//
//
[System.Security.SecurityCritical]
public byte[] SignData(Stream data) {
Contract.Ensures(Contract.Result() != null);
if (data == null) {
throw new ArgumentNullException("data");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashStream(data);
byte[] hashValue = hashAlgorithm.HashFinal();
return SignHash(hashValue);
}
}
//
//
[System.Security.SecurityCritical]
public override byte[] SignHash(byte[] hash) {
if (hash == null) {
throw new ArgumentNullException("hash");
}
// Make sure we're allowed to sign using this key
KeyContainerPermission permission = Key.BuildKeyContainerPermission(KeyContainerPermissionFlags.Sign);
if (permission != null) {
permission.Demand();
}
// Now that know we have permission to use this key for signing, pull the key value out, which
// will require unmanaged code permission
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
SafeNCryptKeyHandle keyHandle = Key.Handle;
CodeAccessPermission.RevertAssert();
return NCryptNative.SignHash(keyHandle, hash);
}
//
// XML Export
//
// See code:System.Security.Cryptography.ECDsaCng#ECCXMLFormat and
// code:System.Security.Cryptography.Rfc4050KeyFormatter#RFC4050ECKeyFormat for information about
// XML serialization of elliptic curve keys
//
public override string ToXmlString(bool includePrivateParameters) {
throw new NotImplementedException(SR.GetString(SR.Cryptography_ECXmlSerializationFormatRequired));
}
public string ToXmlString(ECKeyXmlFormat format) {
Contract.Ensures(Contract.Result() != null);
if (format != ECKeyXmlFormat.Rfc4050) {
throw new ArgumentOutOfRangeException("format");
}
return Rfc4050KeyFormatter.ToXml(Key);
}
//
// Signature verification
//
public bool VerifyData(byte[] data, byte[] signature) {
if (data == null) {
throw new ArgumentNullException("data");
}
return VerifyData(data, 0, data.Length, signature);
}
//
//
[System.Security.SecurityCritical]
public bool VerifyData(byte[] data, int offset, int count, byte[] signature) {
if (data == null) {
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 || count > data.Length - offset) {
throw new ArgumentOutOfRangeException("count");
}
if (signature == null) {
throw new ArgumentNullException("signature");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashCore(data, offset, count);
byte[] hashValue = hashAlgorithm.HashFinal();
return VerifyHash(hashValue, signature);
}
}
//
//
[System.Security.SecurityCritical]
public bool VerifyData(Stream data, byte[] signature) {
if (data == null) {
throw new ArgumentNullException("data");
}
if (signature == null) {
throw new ArgumentNullException("signature");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashStream(data);
byte[] hashValue = hashAlgorithm.HashFinal();
return VerifyHash(hashValue, signature);
}
}
//
//
[System.Security.SecurityCritical]
public override bool VerifyHash(byte[] hash, byte[] signature) {
if (hash == null) {
throw new ArgumentNullException("hash");
}
if (signature == null) {
throw new ArgumentNullException("signature");
}
// We need to get the raw key handle to verify the signature. Asserting here is safe since verifiation
// is not a protected operation, and we do not expose the handle to the user code.
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
SafeNCryptKeyHandle keyHandle = Key.Handle;
CodeAccessPermission.RevertAssert();
return NCryptNative.VerifySignature(keyHandle, hash, signature);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
using System;
using System.Diagnostics;
using System.IO;
using System.Security;
using System.Security.Permissions;
using System.Diagnostics.Contracts;
using Microsoft.Win32.SafeHandles;
namespace System.Security.Cryptography {
///
/// Wrapper for NCrypt's implementation of elliptic curve DSA
///
[System.Security.Permissions.HostProtection(MayLeakOnAbort = true)]
public sealed class ECDsaCng : ECDsa {
private static KeySizes[] s_legalKeySizes = new KeySizes[] { new KeySizes(256, 384, 128), new KeySizes(521, 521, 0) };
private CngKey m_key;
private CngAlgorithm m_hashAlgorithm = CngAlgorithm.Sha256;
//
// Constructors
//
public ECDsaCng() : this(521) {
Contract.Ensures(LegalKeySizesValue != null);
}
//
//
[System.Security.SecurityCritical]
public ECDsaCng(int keySize) {
Contract.Ensures(LegalKeySizesValue != null);
if (!NCryptNative.NCryptSupported) {
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
LegalKeySizesValue = s_legalKeySizes;
KeySize = keySize;
}
//
//
[System.Security.SecurityCritical]
public ECDsaCng(CngKey key) {
Contract.Ensures(LegalKeySizesValue != null);
Contract.Ensures(m_key != null && m_key.AlgorithmGroup == CngAlgorithmGroup.ECDsa);
if (key == null) {
throw new ArgumentNullException("key");
}
if (key.AlgorithmGroup != CngAlgorithmGroup.ECDsa) {
throw new ArgumentException(SR.GetString(SR.Cryptography_ArgECDsaRequiresECDsaKey), "key");
}
if (!NCryptNative.NCryptSupported) {
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
LegalKeySizesValue = s_legalKeySizes;
// Make a copy of the key so that we continue to work if it gets disposed before this algorithm
//
// This requires an assert for UnmanagedCode since we'll need to access the raw handles of the key
// and the handle constructor of CngKey. The assert is safe since ECDsaCng will never expose the
// key handles to calling code (without first demanding UnmanagedCode via the Handle property of
// CngKey).
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
Key = CngKey.Open(key.Handle, key.IsEphemeral ? CngKeyHandleOpenOptions.EphemeralKey : CngKeyHandleOpenOptions.None);
CodeAccessPermission.RevertAssert();
KeySize = m_key.KeySize;
}
///
/// Hash algorithm to use when generating a signature over arbitrary data
///
public CngAlgorithm HashAlgorithm {
get {
Contract.Ensures(Contract.Result() != null);
return m_hashAlgorithm;
}
set {
Contract.Ensures(m_hashAlgorithm != null);
if (value == null) {
throw new ArgumentNullException("value");
}
m_hashAlgorithm = value;
}
}
///
/// Key to use for signing
///
public CngKey Key {
get {
Contract.Ensures(Contract.Result() != null);
Contract.Ensures(Contract.Result().AlgorithmGroup == CngAlgorithmGroup.ECDsa);
Contract.Ensures(m_key != null && m_key.AlgorithmGroup == CngAlgorithmGroup.ECDsa);
// If the size of the key no longer matches our stored value, then we need to replace it with
// a new key of the correct size.
if (m_key != null && m_key.KeySize != KeySize) {
m_key.Dispose();
m_key = null;
}
if (m_key == null) {
// Map the current key size to a CNG algorithm name
CngAlgorithm algorithm = null;
switch (KeySize) {
case 256:
algorithm = CngAlgorithm.ECDsaP256;
break;
case 384:
algorithm = CngAlgorithm.ECDsaP384;
break;
case 521:
algorithm = CngAlgorithm.ECDsaP521;
break;
default:
Debug.Assert(false, "Illegal key size set");
break;
}
m_key = CngKey.Create(algorithm);
}
return m_key;
}
private set {
Contract.Requires(value != null);
Contract.Ensures(m_key != null && m_key.AlgorithmGroup == CngAlgorithmGroup.ECDsa);
if (value.AlgorithmGroup != CngAlgorithmGroup.ECDsa) {
throw new ArgumentException(SR.GetString(SR.Cryptography_ArgECDsaRequiresECDsaKey));
}
if (m_key != null) {
m_key.Dispose();
}
//
// We do not duplicate the handle because the only time the user has access to the key itself
// to dispose underneath us is when they construct via the CngKey constructor, which does a
// copy. Otherwise all key lifetimes are controlled directly by the ECDsaCng class.
//
m_key = value;
KeySize = m_key.KeySize;
}
}
///
/// Clean up the algorithm
///
protected override void Dispose(bool disposing) {
try {
if (m_key != null) {
m_key.Dispose();
}
}
finally {
base.Dispose(disposing);
}
}
//
// XML Import
//
// #ECCXMLFormat
//
// There is currently not a standard XML format for ECC keys, so we will not implement the default
// To/FromXmlString so that we're not tied to one format when a standard one does exist. Instead we'll
// use an overload which allows the user to specify the format they'd like to serialize into.
//
// See code:System.Security.Cryptography.Rfc4050KeyFormatter#RFC4050ECKeyFormat for information about
// the currently supported format.
//
public override void FromXmlString(string xmlString) {
throw new NotImplementedException(SR.GetString(SR.Cryptography_ECXmlSerializationFormatRequired));
}
public void FromXmlString(string xml, ECKeyXmlFormat format) {
if (xml == null) {
throw new ArgumentNullException("xml");
}
if (format != ECKeyXmlFormat.Rfc4050) {
throw new ArgumentOutOfRangeException("format");
}
Key = Rfc4050KeyFormatter.FromXml(xml);
}
//
// Signature generation
//
public byte[] SignData(byte[] data) {
Contract.Ensures(Contract.Result() != null);
if (data == null) {
throw new ArgumentNullException("data");
}
return SignData(data, 0, data.Length);
}
//
//
[System.Security.SecurityCritical]
public byte[] SignData(byte[] data, int offset, int count) {
Contract.Ensures(Contract.Result() != null);
if (data == null) {
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 || count > data.Length - offset) {
throw new ArgumentOutOfRangeException("count");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashCore(data, offset, count);
byte[] hashValue = hashAlgorithm.HashFinal();
return SignHash(hashValue);
}
}
//
//
[System.Security.SecurityCritical]
public byte[] SignData(Stream data) {
Contract.Ensures(Contract.Result() != null);
if (data == null) {
throw new ArgumentNullException("data");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashStream(data);
byte[] hashValue = hashAlgorithm.HashFinal();
return SignHash(hashValue);
}
}
//
//
[System.Security.SecurityCritical]
public override byte[] SignHash(byte[] hash) {
if (hash == null) {
throw new ArgumentNullException("hash");
}
// Make sure we're allowed to sign using this key
KeyContainerPermission permission = Key.BuildKeyContainerPermission(KeyContainerPermissionFlags.Sign);
if (permission != null) {
permission.Demand();
}
// Now that know we have permission to use this key for signing, pull the key value out, which
// will require unmanaged code permission
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
SafeNCryptKeyHandle keyHandle = Key.Handle;
CodeAccessPermission.RevertAssert();
return NCryptNative.SignHash(keyHandle, hash);
}
//
// XML Export
//
// See code:System.Security.Cryptography.ECDsaCng#ECCXMLFormat and
// code:System.Security.Cryptography.Rfc4050KeyFormatter#RFC4050ECKeyFormat for information about
// XML serialization of elliptic curve keys
//
public override string ToXmlString(bool includePrivateParameters) {
throw new NotImplementedException(SR.GetString(SR.Cryptography_ECXmlSerializationFormatRequired));
}
public string ToXmlString(ECKeyXmlFormat format) {
Contract.Ensures(Contract.Result() != null);
if (format != ECKeyXmlFormat.Rfc4050) {
throw new ArgumentOutOfRangeException("format");
}
return Rfc4050KeyFormatter.ToXml(Key);
}
//
// Signature verification
//
public bool VerifyData(byte[] data, byte[] signature) {
if (data == null) {
throw new ArgumentNullException("data");
}
return VerifyData(data, 0, data.Length, signature);
}
//
//
[System.Security.SecurityCritical]
public bool VerifyData(byte[] data, int offset, int count, byte[] signature) {
if (data == null) {
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 || count > data.Length - offset) {
throw new ArgumentOutOfRangeException("count");
}
if (signature == null) {
throw new ArgumentNullException("signature");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashCore(data, offset, count);
byte[] hashValue = hashAlgorithm.HashFinal();
return VerifyHash(hashValue, signature);
}
}
//
//
[System.Security.SecurityCritical]
public bool VerifyData(Stream data, byte[] signature) {
if (data == null) {
throw new ArgumentNullException("data");
}
if (signature == null) {
throw new ArgumentNullException("signature");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(HashAlgorithm, BCryptNative.ProviderName.MicrosoftPrimitiveProvider)) {
hashAlgorithm.HashStream(data);
byte[] hashValue = hashAlgorithm.HashFinal();
return VerifyHash(hashValue, signature);
}
}
//
//
[System.Security.SecurityCritical]
public override bool VerifyHash(byte[] hash, byte[] signature) {
if (hash == null) {
throw new ArgumentNullException("hash");
}
if (signature == null) {
throw new ArgumentNullException("signature");
}
// We need to get the raw key handle to verify the signature. Asserting here is safe since verifiation
// is not a protected operation, and we do not expose the handle to the user code.
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
SafeNCryptKeyHandle keyHandle = Key.Handle;
CodeAccessPermission.RevertAssert();
return NCryptNative.VerifySignature(keyHandle, hash, signature);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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