public static void SetPassword(CT_SheetProtection xobj, String password, HashAlgorithm hashAlgo, String prefix)
{
if (password == null)
{
xobj.password = null;
xobj.algorithmName = null;
xobj.hashValue = null;
xobj.saltValue = null;
xobj.spinCount = null;
return;
}
if (hashAlgo == null)
{
int hash = CryptoFunctions.CreateXorVerifier1(password);
xobj.password = String.Format("{0:X4}", hash).ToUpper();
}
else
{
SecureRandom random = new SecureRandom();
byte[] salt = random.GenerateSeed(16);
int spinCount = 100000;
byte[] hash = CryptoFunctions.HashPassword(password, hashAlgo, salt, spinCount, false);
xobj.algorithmName = hashAlgo.jceId;
xobj.hashValue = Convert.ToBase64String(hash);
xobj.saltValue = Convert.ToBase64String(salt);
xobj.spinCount = "" + spinCount;
}
}
public static bool ValidatePassword(CT_SheetProtection xobj, String password, String prefix)
{
if (password == null)
{
return(false);
}
string xorHashVal = xobj.password;
string algoName = xobj.algorithmName;
string hashVal = xobj.hashValue;
string saltVal = xobj.saltValue;
string spinCount = xobj.spinCount;
if (xorHashVal != null)
{
int hash1 = Int32.Parse(xorHashVal, NumberStyles.HexNumber);
int hash2 = CryptoFunctions.CreateXorVerifier1(password);
return(hash1 == hash2);
}
else
{
if (hashVal == null || algoName == null || saltVal == null || spinCount == null)
{
return(false);
}
byte[] hash1 = Convert.FromBase64String(hashVal);
HashAlgorithm hashAlgo = HashAlgorithm.FromString(algoName);
byte[] salt = Convert.FromBase64String(saltVal);
int spinCnt = Int32.Parse(spinCount);
byte[] hash2 = CryptoFunctions.HashPassword(password, hashAlgo, salt, spinCnt, false);
return(Arrays.Equals(hash1, hash2));
}
}
/**
* Validates the password, i.e.
* calculates the hash of the given password and Compares it against the stored hash
*
* @param xobj the xmlbeans object which Contains the password attributes
* @param password the password, if null the method will always return false,
* even if there's no password Set
* @param prefix the prefix of the password attributes, may be null
*
* @return true, if the hashes match
*/
public static bool ValidatePassword(XmlNode xobj, String password, String prefix)
{
// TODO: is "velvetSweatshop" the default password?
if (password == null)
{
return(false);
}
XPathNavigator cur = xobj.CreateNavigator();
cur.MoveToAttribute("password", prefix);
String xorHashVal = cur.Value;
cur.MoveToAttribute("algorithmName", prefix);
String algoName = cur.Value;
cur.MoveToAttribute("hashValue", prefix);
String hashVal = cur.Value;
cur.MoveToAttribute("saltValue", prefix);
String saltVal = cur.Value;
cur.MoveToAttribute("spinCount", prefix);
String spinCount = cur.Value;
//cur.Dispose();
if (xorHashVal != null)
{
int hash1 = Int32.Parse(xorHashVal, NumberStyles.HexNumber);
int hash2 = CryptoFunctions.CreateXorVerifier1(password);
return(hash1 == hash2);
}
else
{
if (hashVal == null || algoName == null || saltVal == null || spinCount == null)
{
return(false);
}
byte[] hash1 = Convert.FromBase64String(hashVal);
HashAlgorithm hashAlgo = HashAlgorithm.FromString(algoName);
byte[] salt = Convert.FromBase64String(saltVal);
int spinCnt = Int32.Parse(spinCount);
byte[] hash2 = CryptoFunctions.HashPassword(password, hashAlgo, salt, spinCnt, false);
return(Arrays.Equals(hash1, hash2));
}
}
protected internal static ISecretKey GenerateSecretKey(string password, EncryptionVerifier ver, int keySize)
{
HashAlgorithm hashAlgo = ver.HashAlgorithm;
byte[] pwHash = CryptoFunctions.HashPassword(password, hashAlgo, ver.Salt, ver.SpinCount);
byte[] blockKey = new byte[4];
LittleEndian.PutInt(blockKey, 0, 0);
byte[] finalHash = CryptoFunctions.GenerateKey(pwHash, hashAlgo, blockKey, hashAlgo.hashSize);
byte[] x1 = FillAndXor(finalHash, (byte)0x36);
byte[] x2 = FillAndXor(finalHash, (byte)0x5c);
byte[] x3 = new byte[x1.Length + x2.Length];
Array.Copy(x1, 0, x3, 0, x1.Length);
Array.Copy(x2, 0, x3, x1.Length, x2.Length);
byte[] key = Arrays.CopyOf(x3, keySize);
ISecretKey skey = new SecretKeySpec(key, ver.CipherAlgorithm.jceId);
return(skey);
}
/**
* Sets the XORed or hashed password
*
* @param xobj the xmlbeans object which Contains the password attributes
* @param password the password, if null, the password attributes will be Removed
* @param hashAlgo the hash algorithm, if null the password will be XORed
* @param prefix the prefix of the password attributes, may be null
*/
public static void SetPassword(XmlNode xobj, String password, HashAlgorithm hashAlgo, String prefix)
{
XPathNavigator cur = xobj.CreateNavigator();
if (password == null)
{
//dose the prefix is namespace? check it!!!
if (cur.MoveToAttribute("password", prefix))
{
cur.DeleteSelf();
}
if (cur.MoveToAttribute("algorithmName", prefix))
{
cur.DeleteSelf();
}
if (cur.MoveToAttribute("hashValue", prefix))
{
cur.DeleteSelf();
}
if (cur.MoveToAttribute("saltValue", prefix))
{
cur.DeleteSelf();
}
if (cur.MoveToAttribute("spinCount", prefix))
{
cur.DeleteSelf();
}
return;
}
//cur.ToFirstContentToken();
if (hashAlgo == null)
{
int hash = CryptoFunctions.CreateXorVerifier1(password);
cur.CreateAttribute(prefix, "password", null, String.Format("{0:X4}", hash).ToUpper());
//cur.InsertAttributeWithValue(GetAttrName(prefix, "password"),
// String.Format("{0:X}", hash).ToUpper());
}
else
{
SecureRandom random = new SecureRandom();
byte[] salt = random.GenerateSeed(16);
// Iterations specifies the number of times the hashing function shall be iteratively run (using each
// iteration's result as the input for the next iteration).
int spinCount = 100000;
// Implementation Notes List:
// --> In this third stage, the reversed byte order legacy hash from the second stage shall
// be Converted to Unicode hex string representation
byte[] hash = CryptoFunctions.HashPassword(password, hashAlgo, salt, spinCount, false);
cur.CreateAttribute(prefix, "algorithmName", null, hashAlgo.jceId);
cur.CreateAttribute(prefix, "hashValue", null, Convert.ToBase64String(hash));
cur.CreateAttribute(prefix, "saltValue", null, Convert.ToBase64String(salt));
cur.CreateAttribute(prefix, "spinCount", null, "" + spinCount);
//cur.InsertAttributeWithValue(GetAttrName(prefix, "algorithmName"), hashAlgo.jceId);
//cur.InsertAttributeWithValue(GetAttrName(prefix, "hashValue"), Convert.ToBase64String(hash));
//cur.InsertAttributeWithValue(GetAttrName(prefix, "saltValue"), Convert.ToBase64String(salt));
//cur.InsertAttributeWithValue(GetAttrName(prefix, "spinCount"), "" + spinCount);
}
//cur.Dispose();
}
/**
* Set decryption password
*/
public override bool VerifyPassword(String password)
{
AgileEncryptionVerifier ver = (AgileEncryptionVerifier)builder.GetVerifier();
AgileEncryptionHeader header = (AgileEncryptionHeader)builder.GetHeader();
HashAlgorithm hashAlgo = header.HashAlgorithm;
CipherAlgorithm cipherAlgo = header.CipherAlgorithm;
int blockSize = header.BlockSize;
int keySize = header.KeySize / 8;
byte[] pwHash = CryptoFunctions.HashPassword(password, ver.HashAlgorithm, ver.Salt, ver.SpinCount);
/**
* encryptedVerifierHashInput: This attribute MUST be generated by using the following steps:
* 1. Generate a random array of bytes with the number of bytes used specified by the saltSize
* attribute.
* 2. Generate an encryption key as specified in section 2.3.4.11 by using the user-supplied password,
* the binary byte array used to create the saltValue attribute, and a blockKey byte array
* consisting of the following bytes: 0xfe, 0xa7, 0xd2, 0x76, 0x3b, 0x4b, 0x9e, and 0x79.
* 3. Encrypt the random array of bytes generated in step 1 by using the binary form of the saltValue
* attribute as an Initialization vector as specified in section 2.3.4.12. If the array of bytes is not an
* integral multiple of blockSize bytes, pad the array with 0x00 to the next integral multiple of
* blockSize bytes.
* 4. Use base64 to encode the result of step 3.
*/
byte[] verfierInputEnc = hashInput(builder, pwHash, kVerifierInputBlock, ver.EncryptedVerifier, Cipher.DECRYPT_MODE);
SetVerifier(verfierInputEnc);
MessageDigest hashMD = CryptoFunctions.GetMessageDigest(hashAlgo);
byte[] verifierHash = hashMD.Digest(verfierInputEnc);
/**
* encryptedVerifierHashValue: This attribute MUST be generated by using the following steps:
* 1. Obtain the hash value of the random array of bytes generated in step 1 of the steps for
* encryptedVerifierHashInput.
* 2. Generate an encryption key as specified in section 2.3.4.11 by using the user-supplied password,
* the binary byte array used to create the saltValue attribute, and a blockKey byte array
* consisting of the following bytes: 0xd7, 0xaa, 0x0f, 0x6d, 0x30, 0x61, 0x34, and 0x4e.
* 3. Encrypt the hash value obtained in step 1 by using the binary form of the saltValue attribute as
* an Initialization vector as specified in section 2.3.4.12. If hashSize is not an integral multiple of
* blockSize bytes, pad the hash value with 0x00 to an integral multiple of blockSize bytes.
* 4. Use base64 to encode the result of step 3.
*/
byte[] verifierHashDec = hashInput(builder, pwHash, kHashedVerifierBlock, ver.EncryptedVerifierHash, Cipher.DECRYPT_MODE);
verifierHashDec = CryptoFunctions.GetBlock0(verifierHashDec, hashAlgo.hashSize);
/**
* encryptedKeyValue: This attribute MUST be generated by using the following steps:
* 1. Generate a random array of bytes that is the same size as specified by the
* Encryptor.KeyData.keyBits attribute of the parent element.
* 2. Generate an encryption key as specified in section 2.3.4.11, using the user-supplied password,
* the binary byte array used to create the saltValue attribute, and a blockKey byte array
* consisting of the following bytes: 0x14, 0x6e, 0x0b, 0xe7, 0xab, 0xac, 0xd0, and 0xd6.
* 3. Encrypt the random array of bytes generated in step 1 by using the binary form of the saltValue
* attribute as an Initialization vector as specified in section 2.3.4.12. If the array of bytes is not an
* integral multiple of blockSize bytes, pad the array with 0x00 to an integral multiple of
* blockSize bytes.
* 4. Use base64 to encode the result of step 3.
*/
byte[] keyspec = hashInput(builder, pwHash, kCryptoKeyBlock, ver.EncryptedKey, Cipher.DECRYPT_MODE);
keyspec = CryptoFunctions.GetBlock0(keyspec, keySize);
SecretKeySpec secretKey = new SecretKeySpec(keyspec, ver.CipherAlgorithm.jceId);
/**
* 1. Obtain the intermediate key by decrypting the encryptedKeyValue from a KeyEncryptor
* Contained within the KeyEncryptors sequence. Use this key for encryption operations in the
* remaining steps of this section.
* 2. Generate a random array of bytes, known as Salt, of the same length as the value of the
* KeyData.HashSize attribute.
* 3. Encrypt the random array of bytes generated in step 2 by using the binary form of the
* KeyData.saltValue attribute and a blockKey byte array consisting of the following bytes: 0x5f,
* 0xb2, 0xad, 0x01, 0x0c, 0xb9, 0xe1, and 0xf6 used to form an Initialization vector as specified in
* section 2.3.4.12. If the array of bytes is not an integral multiple of blockSize bytes, pad the
* array with 0x00 to the next integral multiple of blockSize bytes.
* 4. Assign the encryptedHmacKey attribute to the base64-encoded form of the result of step 3.
*/
byte[] vec = CryptoFunctions.GenerateIv(hashAlgo, header.KeySalt, kIntegrityKeyBlock, blockSize);
Cipher cipher = CryptoFunctions.GetCipher(secretKey, cipherAlgo, ver.ChainingMode, vec, Cipher.DECRYPT_MODE);
byte[] hmacKey = cipher.DoFinal(header.GetEncryptedHmacKey());
hmacKey = CryptoFunctions.GetBlock0(hmacKey, hashAlgo.hashSize);
/**
* 5. Generate an HMAC, as specified in [RFC2104], of the encrypted form of the data (message),
* which the DataIntegrity element will verify by using the Salt generated in step 2 as the key.
* Note that the entire EncryptedPackage stream (1), including the StreamSize field, MUST be
* used as the message.
* 6. Encrypt the HMAC as in step 3 by using a blockKey byte array consisting of the following bytes:
* 0xa0, 0x67, 0x7f, 0x02, 0xb2, 0x2c, 0x84, and 0x33.
* 7. Assign the encryptedHmacValue attribute to the base64-encoded form of the result of step 6.
*/
vec = CryptoFunctions.GenerateIv(hashAlgo, header.KeySalt, kIntegrityValueBlock, blockSize);
cipher = CryptoFunctions.GetCipher(secretKey, cipherAlgo, ver.ChainingMode, vec, Cipher.DECRYPT_MODE);
byte[] hmacValue = cipher.DoFinal(header.GetEncryptedHmacValue());
hmacValue = CryptoFunctions.GetBlock0(hmacValue, hashAlgo.hashSize);
if (Arrays.Equals(verifierHashDec, verifierHash))
{
SetSecretKey(secretKey);
SetIntegrityHmacKey(hmacKey);
SetIntegrityHmacValue(hmacValue);
return(true);
}
else
{
return(false);
}
}
public override void ConfirmPassword(String password, byte[] keySpec, byte[] keySalt, byte[] verifier, byte[] verifierSalt, byte[] integritySalt)
{
AgileEncryptionVerifier ver = builder.GetVerifier();
ver.Salt = (/*setter*/ verifierSalt);
AgileEncryptionHeader header = builder.GetHeader();
header.KeySalt = (/*setter*/ keySalt);
HashAlgorithm hashAlgo = ver.HashAlgorithm;
int blockSize = header.BlockSize;
pwHash = CryptoFunctions.HashPassword(password, hashAlgo, verifierSalt, ver.SpinCount);
/**
* encryptedVerifierHashInput: This attribute MUST be generated by using the following steps:
* 1. Generate a random array of bytes with the number of bytes used specified by the saltSize
* attribute.
* 2. Generate an encryption key as specified in section 2.3.4.11 by using the user-supplied password,
* the binary byte array used to create the saltValue attribute, and a blockKey byte array
* consisting of the following bytes: 0xfe, 0xa7, 0xd2, 0x76, 0x3b, 0x4b, 0x9e, and 0x79.
* 3. Encrypt the random array of bytes generated in step 1 by using the binary form of the saltValue
* attribute as an Initialization vector as specified in section 2.3.4.12. If the array of bytes is not an
* integral multiple of blockSize bytes, pad the array with 0x00 to the next integral multiple of
* blockSize bytes.
* 4. Use base64 to encode the result of step 3.
*/
byte[] encryptedVerifier = AgileDecryptor.hashInput(builder, pwHash, AgileDecryptor.kVerifierInputBlock, verifier, Cipher.ENCRYPT_MODE);
ver.EncryptedVerifier = (/*setter*/ encryptedVerifier);
/**
* encryptedVerifierHashValue: This attribute MUST be generated by using the following steps:
* 1. Obtain the hash value of the random array of bytes generated in step 1 of the steps for
* encryptedVerifierHashInput.
* 2. Generate an encryption key as specified in section 2.3.4.11 by using the user-supplied password,
* the binary byte array used to create the saltValue attribute, and a blockKey byte array
* consisting of the following bytes: 0xd7, 0xaa, 0x0f, 0x6d, 0x30, 0x61, 0x34, and 0x4e.
* 3. Encrypt the hash value obtained in step 1 by using the binary form of the saltValue attribute as
* an Initialization vector as specified in section 2.3.4.12. If hashSize is not an integral multiple of
* blockSize bytes, pad the hash value with 0x00 to an integral multiple of blockSize bytes.
* 4. Use base64 to encode the result of step 3.
*/
MessageDigest hashMD = CryptoFunctions.GetMessageDigest(hashAlgo);
byte[] hashedVerifier = hashMD.Digest(verifier);
byte[] encryptedVerifierHash = AgileDecryptor.hashInput(builder, pwHash, AgileDecryptor.kHashedVerifierBlock, hashedVerifier, Cipher.ENCRYPT_MODE);
ver.EncryptedVerifierHash = (/*setter*/ encryptedVerifierHash);
/**
* encryptedKeyValue: This attribute MUST be generated by using the following steps:
* 1. Generate a random array of bytes that is the same size as specified by the
* Encryptor.KeyData.keyBits attribute of the parent element.
* 2. Generate an encryption key as specified in section 2.3.4.11, using the user-supplied password,
* the binary byte array used to create the saltValue attribute, and a blockKey byte array
* consisting of the following bytes: 0x14, 0x6e, 0x0b, 0xe7, 0xab, 0xac, 0xd0, and 0xd6.
* 3. Encrypt the random array of bytes generated in step 1 by using the binary form of the saltValue
* attribute as an Initialization vector as specified in section 2.3.4.12. If the array of bytes is not an
* integral multiple of blockSize bytes, pad the array with 0x00 to an integral multiple of
* blockSize bytes.
* 4. Use base64 to encode the result of step 3.
*/
byte[] encryptedKey = AgileDecryptor.hashInput(builder, pwHash, AgileDecryptor.kCryptoKeyBlock, keySpec, Cipher.ENCRYPT_MODE);
ver.EncryptedKey = (/*setter*/ encryptedKey);
ISecretKey secretKey = new SecretKeySpec(keySpec, ver.CipherAlgorithm.jceId);
SetSecretKey(secretKey);
/*
* 2.3.4.14 DataIntegrity Generation (Agile Encryption)
*
* The DataIntegrity element Contained within an Encryption element MUST be generated by using
* the following steps:
* 1. Obtain the intermediate key by decrypting the encryptedKeyValue from a KeyEncryptor
* Contained within the KeyEncryptors sequence. Use this key for encryption operations in the
* remaining steps of this section.
* 2. Generate a random array of bytes, known as Salt, of the same length as the value of the
* KeyData.HashSize attribute.
* 3. Encrypt the random array of bytes generated in step 2 by using the binary form of the
* KeyData.saltValue attribute and a blockKey byte array consisting of the following bytes:
* 0x5f, 0xb2, 0xad, 0x01, 0x0c, 0xb9, 0xe1, and 0xf6 used to form an Initialization vector as
* specified in section 2.3.4.12. If the array of bytes is not an integral multiple of blockSize
* bytes, pad the array with 0x00 to the next integral multiple of blockSize bytes.
* 4. Assign the encryptedHmacKey attribute to the base64-encoded form of the result of step 3.
* 5. Generate an HMAC, as specified in [RFC2104], of the encrypted form of the data (message),
* which the DataIntegrity element will verify by using the Salt generated in step 2 as the key.
* Note that the entire EncryptedPackage stream (1), including the StreamSize field, MUST be
* used as the message.
* 6. Encrypt the HMAC as in step 3 by using a blockKey byte array consisting of the following bytes:
* 0xa0, 0x67, 0x7f, 0x02, 0xb2, 0x2c, 0x84, and 0x33.
* 7. Assign the encryptedHmacValue attribute to the base64-encoded form of the result of step 6.
*/
this.integritySalt = integritySalt;
try {
byte[] vec = CryptoFunctions.GenerateIv(hashAlgo, header.KeySalt, AgileDecryptor.kIntegrityKeyBlock, header.BlockSize);
Cipher cipher = CryptoFunctions.GetCipher(secretKey, ver.CipherAlgorithm, ver.ChainingMode, vec, Cipher.ENCRYPT_MODE);
byte[] FilledSalt = CryptoFunctions.GetBlock0(integritySalt, AgileDecryptor.GetNextBlockSize(integritySalt.Length, blockSize));
byte[] encryptedHmacKey = cipher.DoFinal(FilledSalt);
header.SetEncryptedHmacKey(encryptedHmacKey);
cipher = Cipher.GetInstance("RSA");
foreach (AgileEncryptionVerifier.AgileCertificateEntry ace in ver.GetCertificates())
{
cipher.Init(Cipher.ENCRYPT_MODE, ace.x509.GetPublicKey());
ace.encryptedKey = cipher.DoFinal(GetSecretKey().GetEncoded());
CryptoFunctions.Mac x509Hmac = CryptoFunctions.GetMac(hashAlgo);
x509Hmac.Init(GetSecretKey());
ace.certVerifier = x509Hmac.DoFinal(ace.x509.GetEncoded());
}
} catch (Exception e) {
throw new EncryptedDocumentException(e);
}
}
