/// <summary>
/// Constructor.
/// </summary>
/// <param name="sqlTceCipherInfoEntry"></param>
/// <param name="sqlClientEncryptionAlgorithm"></param>
/// <param name="cipherAlgorithmId"></param>
/// <param name="encryptionType"></param>
/// <param name="normalizationRuleVersion"></param>
internal SqlCipherMetadata (SqlTceCipherInfoEntry? sqlTceCipherInfoEntry,
ushort ordinal,
byte cipherAlgorithmId,
string cipherAlgorithmName,
byte encryptionType,
byte normalizationRuleVersion) {
Debug.Assert(!sqlTceCipherInfoEntry.Equals(default(SqlTceCipherInfoEntry)), "sqlTceCipherInfoEntry should not be un-initialized.");
_sqlTceCipherInfoEntry = sqlTceCipherInfoEntry;
_ordinal = ordinal;
_cipherAlgorithmId = cipherAlgorithmId;
_cipherAlgorithmName = cipherAlgorithmName;
_encryptionType = encryptionType;
_normalizationRuleVersion = normalizationRuleVersion;
_sqlEncryptionKeyInfo = null;
}
/// <summary>
/// <para> Parses the TDS message to read single CIPHER_INFO entry.</para>
/// </summary>
internal bool TryReadCipherInfoEntry (TdsParserStateObject stateObj, out SqlTceCipherInfoEntry entry) {
byte cekValueCount = 0;
entry = new SqlTceCipherInfoEntry(ordinal: 0);
// Read the DB ID
int dbId;
if (!stateObj.TryReadInt32(out dbId)) {
return false;
}
// Read the keyID
int keyId;
if (!stateObj.TryReadInt32(out keyId)) {
return false;
}
// Read the key version
int keyVersion;
if (!stateObj.TryReadInt32(out keyVersion)) {
return false;
}
// Read the key MD Version
byte[] keyMDVersion = new byte[8];
if (!stateObj.TryReadByteArray(keyMDVersion, 0, 8)) {
return false;
}
// Read the value count
if (!stateObj.TryReadByte (out cekValueCount)) {
return false;
}
for (int i = 0; i < cekValueCount; i++) {
// Read individual CEK values
byte[] encryptedCek;
string keyPath;
string keyStoreName;
byte algorithmLength;
string algorithmName;
ushort shortValue;
byte byteValue;
int length;
// Read the length of encrypted CEK
if (!stateObj.TryReadUInt16 (out shortValue)) {
return false;
}
length = shortValue;
encryptedCek = new byte[length];
// Read the actual encrypted CEK
if (!stateObj.TryReadByteArray (encryptedCek, 0, length)) {
return false;
}
// Read the length of key store name
if (!stateObj.TryReadByte (out byteValue)) {
return false;
}
length = byteValue;
// And read the key store name now
if (!stateObj.TryReadString(length, out keyStoreName)) {
return false;
}
// Read the length of key Path
if (!stateObj.TryReadUInt16 (out shortValue)) {
return false;
}
length = shortValue;
// Read the key path string
if (!stateObj.TryReadString(length, out keyPath)) {
return false;
}
// Read the length of the string carrying the encryption algo
if (!stateObj.TryReadByte(out algorithmLength)) {
return false;
}
length = (int)algorithmLength;
// Read the string carrying the encryption algo (eg. RSA_PKCS_OAEP)
if (!stateObj.TryReadString(length, out algorithmName)) {
return false;
}
// Add this encrypted CEK blob to our list of encrypted values for the CEK
entry.Add(encryptedCek,
databaseId: dbId,
cekId: keyId,
cekVersion: keyVersion,
cekMdVersion: keyMDVersion,
keyPath: keyPath,
keyStoreName: keyStoreName,
algorithmName: algorithmName);
}
return true;
}