Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / ManagedLibraries / Security / System / Security / Cryptography / Xml / SymmetricKeyWrap.cs / 1 / SymmetricKeyWrap.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//----------------------------------------------------------------------------
//
// SymmetricKeyWrap.cs
//
// 04/01/2002
//
//---------------------------------------------------------------------------
namespace System.Security.Cryptography.Xml
{
using System;
using System.Security.Cryptography;
// abstract class providing symmetric key wrap implementation
internal static class SymmetricKeyWrap {
private readonly static byte[] s_rgbTripleDES_KW_IV = {0x4a, 0xdd, 0xa2, 0x2c, 0x79, 0xe8, 0x21, 0x05};
private readonly static byte[] s_rgbAES_KW_IV = {0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6};
//
// internal static methods
//
// CMS TripleDES KeyWrap as described in "http://www.w3.org/2001/04/xmlenc#kw-tripledes"
internal static byte[] TripleDESKeyWrapEncrypt (byte[] rgbKey, byte[] rgbWrappedKeyData) {
// checksum the key
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
byte[] rgbCKS = sha.ComputeHash(rgbWrappedKeyData);
// generate a random IV
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] rgbIV = new byte[8];
rng.GetBytes(rgbIV);
// rgbWKCS = rgbWrappedKeyData | (first 8 bytes of the hash)
byte[] rgbWKCKS = new byte[rgbWrappedKeyData.Length + 8];
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
// Don't add padding, use CBC mode: for example, a 192 bits key will yield 40 bytes of encrypted data
tripleDES.Padding = PaddingMode.None;
ICryptoTransform enc1 = tripleDES.CreateEncryptor(rgbKey, rgbIV);
Buffer.BlockCopy(rgbWrappedKeyData, 0, rgbWKCKS, 0, rgbWrappedKeyData.Length);
Buffer.BlockCopy(rgbCKS, 0, rgbWKCKS, rgbWrappedKeyData.Length, 8);
byte[] temp1 = enc1.TransformFinalBlock(rgbWKCKS, 0, rgbWKCKS.Length);
byte[] temp2 = new byte[rgbIV.Length + temp1.Length];
Buffer.BlockCopy(rgbIV, 0, temp2, 0, rgbIV.Length);
Buffer.BlockCopy(temp1, 0, temp2, rgbIV.Length, temp1.Length);
// temp2 = REV (rgbIV | E_k(rgbWrappedKeyData | rgbCKS))
Array.Reverse(temp2);
ICryptoTransform enc2 = tripleDES.CreateEncryptor(rgbKey, s_rgbTripleDES_KW_IV);
return enc2.TransformFinalBlock(temp2, 0, temp2.Length);
}
internal static byte[] TripleDESKeyWrapDecrypt (byte[] rgbKey, byte[] rgbEncryptedWrappedKeyData) {
// Check to see whether the length of the encrypted key is reasonable
if (rgbEncryptedWrappedKeyData.Length != 32 && rgbEncryptedWrappedKeyData.Length != 40
&& rgbEncryptedWrappedKeyData.Length != 48)
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_KW_BadKeySize"));
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
// Assume no padding, use CBC mode
tripleDES.Padding = PaddingMode.None;
ICryptoTransform dec1 = tripleDES.CreateDecryptor(rgbKey, s_rgbTripleDES_KW_IV);
byte[] temp2 = dec1.TransformFinalBlock(rgbEncryptedWrappedKeyData, 0, rgbEncryptedWrappedKeyData.Length);
Array.Reverse(temp2);
// Get the IV and temp1
byte[] rgbIV = new byte[8];
Buffer.BlockCopy(temp2, 0, rgbIV, 0, 8);
byte[] temp1 = new byte[temp2.Length - rgbIV.Length];
Buffer.BlockCopy(temp2, 8, temp1, 0, temp1.Length);
ICryptoTransform dec2 = tripleDES.CreateDecryptor(rgbKey, rgbIV);
byte[] rgbWKCKS = dec2.TransformFinalBlock(temp1, 0, temp1.Length);
// checksum the key
byte[] rgbWrappedKeyData = new byte[rgbWKCKS.Length - 8];
Buffer.BlockCopy(rgbWKCKS, 0, rgbWrappedKeyData, 0, rgbWrappedKeyData.Length);
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
byte[] rgbCKS = sha.ComputeHash(rgbWrappedKeyData);
for (int index = rgbWrappedKeyData.Length, index1 = 0; index < rgbWKCKS.Length; index++, index1++)
if (rgbWKCKS[index] != rgbCKS[index1])
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_BadWrappedKeySize"));
return rgbWrappedKeyData;
}
// AES KeyWrap described in "http://www.w3.org/2001/04/xmlenc#kw-aes***", as suggested by NIST
internal static byte[] AESKeyWrapEncrypt (byte[] rgbKey, byte[] rgbWrappedKeyData) {
int N = rgbWrappedKeyData.Length >> 3;
// The information wrapped need not actually be a key, but it needs to be a multiple of 64 bits
if ((rgbWrappedKeyData.Length % 8 != 0) || N <= 0)
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_KW_BadKeySize"));
RijndaelManaged rijn = new RijndaelManaged();
rijn.Key = rgbKey;
// Use ECB mode, no padding
rijn.Mode = CipherMode.ECB;
rijn.Padding = PaddingMode.None;
ICryptoTransform enc = rijn.CreateEncryptor();
// special case: only 1 block -- 8 bytes
if (N == 1) {
// temp = 0xa6a6a6a6a6a6a6a6 | P(1)
byte[] temp = new byte[s_rgbAES_KW_IV.Length + rgbWrappedKeyData.Length];
Buffer.BlockCopy(s_rgbAES_KW_IV, 0, temp, 0, s_rgbAES_KW_IV.Length);
Buffer.BlockCopy(rgbWrappedKeyData, 0, temp, s_rgbAES_KW_IV.Length, rgbWrappedKeyData.Length);
return enc.TransformFinalBlock(temp, 0, temp.Length);
}
// second case: more than 1 block
Int64 t = 0;
byte[] rgbOutput = new byte[(N+1) << 3];
// initialize the R_i's
Buffer.BlockCopy(rgbWrappedKeyData, 0, rgbOutput, 8, rgbWrappedKeyData.Length);
byte[] rgbA = new byte[8];
byte[] rgbBlock = new byte[16];
Buffer.BlockCopy(s_rgbAES_KW_IV, 0, rgbA, 0, 8);
for (int j=0; j<=5; j++) {
for (int i=1; i<=N; i++) {
t = i + j*N;
Buffer.BlockCopy(rgbA, 0, rgbBlock, 0, 8);
Buffer.BlockCopy(rgbOutput, 8*i, rgbBlock, 8, 8);
byte[] rgbB = enc.TransformFinalBlock(rgbBlock, 0, 16);
for (int k=0; k<8; k++) {
byte tmp = (byte) ((t >> (8*(7-k))) & 0xFF);
rgbA[k] = (byte) (tmp ^ rgbB[k]);
}
Buffer.BlockCopy(rgbB, 8, rgbOutput, 8*i, 8);
}
}
// Set the first block of rgbOutput to rgbA
Buffer.BlockCopy(rgbA, 0, rgbOutput, 0, 8);
return rgbOutput;
}
internal static byte[] AESKeyWrapDecrypt (byte[] rgbKey, byte[] rgbEncryptedWrappedKeyData) {
int N = (rgbEncryptedWrappedKeyData.Length >> 3) - 1;
// The information wrapped need not actually be a key, but it needs to be a multiple of 64 bits
if ((rgbEncryptedWrappedKeyData.Length % 8 != 0) || N <= 0)
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_KW_BadKeySize"));
byte[] rgbOutput = new byte[N << 3];
RijndaelManaged rijn = new RijndaelManaged();
rijn.Key = rgbKey;
// Use ECB mode, no padding
rijn.Mode = CipherMode.ECB;
rijn.Padding = PaddingMode.None;
ICryptoTransform dec = rijn.CreateDecryptor();
// special case: only 1 block -- 8 bytes
if (N == 1) {
byte[] temp = dec.TransformFinalBlock(rgbEncryptedWrappedKeyData, 0, rgbEncryptedWrappedKeyData.Length);
// checksum the key
for (int index = 0; index < 8; index++)
if (temp[index] != s_rgbAES_KW_IV[index])
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_BadWrappedKeySize"));
// rgbOutput is LSB(temp)
Buffer.BlockCopy(temp, 8, rgbOutput, 0, 8);
return rgbOutput;
}
// second case: more than 1 block
Int64 t = 0;
// initialize the C_i's
Buffer.BlockCopy(rgbEncryptedWrappedKeyData, 8, rgbOutput, 0, rgbOutput.Length);
byte[] rgbA = new byte[8];
byte[] rgbBlock = new byte[16];
Buffer.BlockCopy(rgbEncryptedWrappedKeyData, 0, rgbA, 0, 8);
for (int j=5; j>=0; j--) {
for (int i=N; i>=1; i--) {
t = i + j*N;
for (int k=0; k<8; k++) {
byte tmp = (byte) ((t >> (8*(7-k))) & 0xFF);
rgbA[k] ^= tmp;
}
Buffer.BlockCopy(rgbA, 0, rgbBlock, 0, 8);
Buffer.BlockCopy(rgbOutput, 8*(i-1), rgbBlock, 8, 8);
byte[] rgbB = dec.TransformFinalBlock(rgbBlock, 0, 16);
Buffer.BlockCopy(rgbB, 8, rgbOutput, 8*(i-1), 8);
Buffer.BlockCopy(rgbB, 0, rgbA, 0, 8);
}
}
// checksum the key
for (int index = 0; index < 8; index++)
if (rgbA[index] != s_rgbAES_KW_IV[index])
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_BadWrappedKeySize"));
return rgbOutput;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//----------------------------------------------------------------------------
//
// SymmetricKeyWrap.cs
//
// 04/01/2002
//
//---------------------------------------------------------------------------
namespace System.Security.Cryptography.Xml
{
using System;
using System.Security.Cryptography;
// abstract class providing symmetric key wrap implementation
internal static class SymmetricKeyWrap {
private readonly static byte[] s_rgbTripleDES_KW_IV = {0x4a, 0xdd, 0xa2, 0x2c, 0x79, 0xe8, 0x21, 0x05};
private readonly static byte[] s_rgbAES_KW_IV = {0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6};
//
// internal static methods
//
// CMS TripleDES KeyWrap as described in "http://www.w3.org/2001/04/xmlenc#kw-tripledes"
internal static byte[] TripleDESKeyWrapEncrypt (byte[] rgbKey, byte[] rgbWrappedKeyData) {
// checksum the key
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
byte[] rgbCKS = sha.ComputeHash(rgbWrappedKeyData);
// generate a random IV
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] rgbIV = new byte[8];
rng.GetBytes(rgbIV);
// rgbWKCS = rgbWrappedKeyData | (first 8 bytes of the hash)
byte[] rgbWKCKS = new byte[rgbWrappedKeyData.Length + 8];
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
// Don't add padding, use CBC mode: for example, a 192 bits key will yield 40 bytes of encrypted data
tripleDES.Padding = PaddingMode.None;
ICryptoTransform enc1 = tripleDES.CreateEncryptor(rgbKey, rgbIV);
Buffer.BlockCopy(rgbWrappedKeyData, 0, rgbWKCKS, 0, rgbWrappedKeyData.Length);
Buffer.BlockCopy(rgbCKS, 0, rgbWKCKS, rgbWrappedKeyData.Length, 8);
byte[] temp1 = enc1.TransformFinalBlock(rgbWKCKS, 0, rgbWKCKS.Length);
byte[] temp2 = new byte[rgbIV.Length + temp1.Length];
Buffer.BlockCopy(rgbIV, 0, temp2, 0, rgbIV.Length);
Buffer.BlockCopy(temp1, 0, temp2, rgbIV.Length, temp1.Length);
// temp2 = REV (rgbIV | E_k(rgbWrappedKeyData | rgbCKS))
Array.Reverse(temp2);
ICryptoTransform enc2 = tripleDES.CreateEncryptor(rgbKey, s_rgbTripleDES_KW_IV);
return enc2.TransformFinalBlock(temp2, 0, temp2.Length);
}
internal static byte[] TripleDESKeyWrapDecrypt (byte[] rgbKey, byte[] rgbEncryptedWrappedKeyData) {
// Check to see whether the length of the encrypted key is reasonable
if (rgbEncryptedWrappedKeyData.Length != 32 && rgbEncryptedWrappedKeyData.Length != 40
&& rgbEncryptedWrappedKeyData.Length != 48)
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_KW_BadKeySize"));
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
// Assume no padding, use CBC mode
tripleDES.Padding = PaddingMode.None;
ICryptoTransform dec1 = tripleDES.CreateDecryptor(rgbKey, s_rgbTripleDES_KW_IV);
byte[] temp2 = dec1.TransformFinalBlock(rgbEncryptedWrappedKeyData, 0, rgbEncryptedWrappedKeyData.Length);
Array.Reverse(temp2);
// Get the IV and temp1
byte[] rgbIV = new byte[8];
Buffer.BlockCopy(temp2, 0, rgbIV, 0, 8);
byte[] temp1 = new byte[temp2.Length - rgbIV.Length];
Buffer.BlockCopy(temp2, 8, temp1, 0, temp1.Length);
ICryptoTransform dec2 = tripleDES.CreateDecryptor(rgbKey, rgbIV);
byte[] rgbWKCKS = dec2.TransformFinalBlock(temp1, 0, temp1.Length);
// checksum the key
byte[] rgbWrappedKeyData = new byte[rgbWKCKS.Length - 8];
Buffer.BlockCopy(rgbWKCKS, 0, rgbWrappedKeyData, 0, rgbWrappedKeyData.Length);
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
byte[] rgbCKS = sha.ComputeHash(rgbWrappedKeyData);
for (int index = rgbWrappedKeyData.Length, index1 = 0; index < rgbWKCKS.Length; index++, index1++)
if (rgbWKCKS[index] != rgbCKS[index1])
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_BadWrappedKeySize"));
return rgbWrappedKeyData;
}
// AES KeyWrap described in "http://www.w3.org/2001/04/xmlenc#kw-aes***", as suggested by NIST
internal static byte[] AESKeyWrapEncrypt (byte[] rgbKey, byte[] rgbWrappedKeyData) {
int N = rgbWrappedKeyData.Length >> 3;
// The information wrapped need not actually be a key, but it needs to be a multiple of 64 bits
if ((rgbWrappedKeyData.Length % 8 != 0) || N <= 0)
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_KW_BadKeySize"));
RijndaelManaged rijn = new RijndaelManaged();
rijn.Key = rgbKey;
// Use ECB mode, no padding
rijn.Mode = CipherMode.ECB;
rijn.Padding = PaddingMode.None;
ICryptoTransform enc = rijn.CreateEncryptor();
// special case: only 1 block -- 8 bytes
if (N == 1) {
// temp = 0xa6a6a6a6a6a6a6a6 | P(1)
byte[] temp = new byte[s_rgbAES_KW_IV.Length + rgbWrappedKeyData.Length];
Buffer.BlockCopy(s_rgbAES_KW_IV, 0, temp, 0, s_rgbAES_KW_IV.Length);
Buffer.BlockCopy(rgbWrappedKeyData, 0, temp, s_rgbAES_KW_IV.Length, rgbWrappedKeyData.Length);
return enc.TransformFinalBlock(temp, 0, temp.Length);
}
// second case: more than 1 block
Int64 t = 0;
byte[] rgbOutput = new byte[(N+1) << 3];
// initialize the R_i's
Buffer.BlockCopy(rgbWrappedKeyData, 0, rgbOutput, 8, rgbWrappedKeyData.Length);
byte[] rgbA = new byte[8];
byte[] rgbBlock = new byte[16];
Buffer.BlockCopy(s_rgbAES_KW_IV, 0, rgbA, 0, 8);
for (int j=0; j<=5; j++) {
for (int i=1; i<=N; i++) {
t = i + j*N;
Buffer.BlockCopy(rgbA, 0, rgbBlock, 0, 8);
Buffer.BlockCopy(rgbOutput, 8*i, rgbBlock, 8, 8);
byte[] rgbB = enc.TransformFinalBlock(rgbBlock, 0, 16);
for (int k=0; k<8; k++) {
byte tmp = (byte) ((t >> (8*(7-k))) & 0xFF);
rgbA[k] = (byte) (tmp ^ rgbB[k]);
}
Buffer.BlockCopy(rgbB, 8, rgbOutput, 8*i, 8);
}
}
// Set the first block of rgbOutput to rgbA
Buffer.BlockCopy(rgbA, 0, rgbOutput, 0, 8);
return rgbOutput;
}
internal static byte[] AESKeyWrapDecrypt (byte[] rgbKey, byte[] rgbEncryptedWrappedKeyData) {
int N = (rgbEncryptedWrappedKeyData.Length >> 3) - 1;
// The information wrapped need not actually be a key, but it needs to be a multiple of 64 bits
if ((rgbEncryptedWrappedKeyData.Length % 8 != 0) || N <= 0)
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_KW_BadKeySize"));
byte[] rgbOutput = new byte[N << 3];
RijndaelManaged rijn = new RijndaelManaged();
rijn.Key = rgbKey;
// Use ECB mode, no padding
rijn.Mode = CipherMode.ECB;
rijn.Padding = PaddingMode.None;
ICryptoTransform dec = rijn.CreateDecryptor();
// special case: only 1 block -- 8 bytes
if (N == 1) {
byte[] temp = dec.TransformFinalBlock(rgbEncryptedWrappedKeyData, 0, rgbEncryptedWrappedKeyData.Length);
// checksum the key
for (int index = 0; index < 8; index++)
if (temp[index] != s_rgbAES_KW_IV[index])
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_BadWrappedKeySize"));
// rgbOutput is LSB(temp)
Buffer.BlockCopy(temp, 8, rgbOutput, 0, 8);
return rgbOutput;
}
// second case: more than 1 block
Int64 t = 0;
// initialize the C_i's
Buffer.BlockCopy(rgbEncryptedWrappedKeyData, 8, rgbOutput, 0, rgbOutput.Length);
byte[] rgbA = new byte[8];
byte[] rgbBlock = new byte[16];
Buffer.BlockCopy(rgbEncryptedWrappedKeyData, 0, rgbA, 0, 8);
for (int j=5; j>=0; j--) {
for (int i=N; i>=1; i--) {
t = i + j*N;
for (int k=0; k<8; k++) {
byte tmp = (byte) ((t >> (8*(7-k))) & 0xFF);
rgbA[k] ^= tmp;
}
Buffer.BlockCopy(rgbA, 0, rgbBlock, 0, 8);
Buffer.BlockCopy(rgbOutput, 8*(i-1), rgbBlock, 8, 8);
byte[] rgbB = dec.TransformFinalBlock(rgbBlock, 0, 16);
Buffer.BlockCopy(rgbB, 8, rgbOutput, 8*(i-1), 8);
Buffer.BlockCopy(rgbB, 0, rgbA, 0, 8);
}
}
// checksum the key
for (int index = 0; index < 8; index++)
if (rgbA[index] != s_rgbAES_KW_IV[index])
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_BadWrappedKeySize"));
return rgbOutput;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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