// Token: 0x0600000E RID: 14 RVA: 0x000022E8 File Offset: 0x000004E8
private IntPtr OpenAlgorithmProvider(string alg, string provider, string chainingMode)
{
IntPtr zero = IntPtr.Zero;
uint num = BCrypt.BCryptOpenAlgorithmProvider(out zero, alg, provider, 0U);
bool flag = num > 0U;
if (flag)
{
throw new CryptographicException(string.Format("BCrypt.BCryptOpenAlgorithmProvider() failed with status code:{0}", num));
}
byte[] bytes = Encoding.Unicode.GetBytes(chainingMode);
num = BCrypt.BCryptSetAlgorithmProperty(zero, BCrypt.BCRYPT_CHAINING_MODE, bytes, bytes.Length, 0);
bool flag2 = num > 0U;
if (flag2)
{
throw new CryptographicException(string.Format("BCrypt.BCryptSetAlgorithmProperty(BCrypt.BCRYPT_CHAINING_MODE, BCrypt.BCRYPT_CHAIN_MODE_GCM) failed with status code:{0}", num));
}
return(zero);
}
// Token: 0x06000010 RID: 16 RVA: 0x00002408 File Offset: 0x00000608
private byte[] GetProperty(IntPtr hAlg, string name)
{
int num = 0;
uint num2 = BCrypt.BCryptGetProperty(hAlg, name, null, 0, ref num, 0U);
bool flag = num2 > 0U;
if (flag)
{
throw new CryptographicException(string.Format("BCrypt.BCryptGetProperty() (get size) failed with status code:{0}", num2));
}
byte[] array = new byte[num];
num2 = BCrypt.BCryptGetProperty(hAlg, name, array, array.Length, ref num, 0U);
bool flag2 = num2 > 0U;
if (flag2)
{
throw new CryptographicException(string.Format("BCrypt.BCryptGetProperty() failed with status code:{0}", num2));
}
return(array);
}
private IntPtr OpenAlgorithmProvider(string alg, string provider, string chainingMode)
{
IntPtr hAlg = IntPtr.Zero;
uint status = BCrypt.BCryptOpenAlgorithmProvider(out hAlg, alg, provider, 0x0);
if (status != BCrypt.ERROR_SUCCESS)
{
throw new CryptographicException(string.Format("BCrypt.BCryptOpenAlgorithmProvider() failed with status code:{0}", status));
}
byte[] chainMode = Encoding.Unicode.GetBytes(chainingMode);
status = BCrypt.BCryptSetAlgorithmProperty(hAlg, BCrypt.BCRYPT_CHAINING_MODE, chainMode, chainMode.Length, 0x0);
if (status != BCrypt.ERROR_SUCCESS)
{
throw new CryptographicException(string.Format("BCrypt.BCryptSetAlgorithmProperty(BCrypt.BCRYPT_CHAINING_MODE, BCrypt.BCRYPT_CHAIN_MODE_GCM) failed with status code:{0}", status));
}
return(hAlg);
}
// Token: 0x0600000F RID: 15 RVA: 0x0000236C File Offset: 0x0000056C
private IntPtr ImportKey(IntPtr hAlg, byte[] key, out IntPtr hKey)
{
byte[] property = this.GetProperty(hAlg, BCrypt.BCRYPT_OBJECT_LENGTH);
int num = BitConverter.ToInt32(property, 0);
IntPtr intPtr = Marshal.AllocHGlobal(num);
byte[] array = this.Concat(new byte[][]
{
BCrypt.BCRYPT_KEY_DATA_BLOB_MAGIC,
BitConverter.GetBytes(1),
BitConverter.GetBytes(key.Length),
key
});
uint num2 = BCrypt.BCryptImportKey(hAlg, IntPtr.Zero, BCrypt.BCRYPT_KEY_DATA_BLOB, out hKey, intPtr, num, array, array.Length, 0U);
bool flag = num2 > 0U;
if (flag)
{
throw new CryptographicException(string.Format("BCrypt.BCryptImportKey() failed with status code:{0}", num2));
}
return(intPtr);
}
private byte[] GetProperty(IntPtr hAlg, string name)
{
int size = 0;
uint status = BCrypt.BCryptGetProperty(hAlg, name, null, 0, ref size, 0x0);
if (status != BCrypt.ERROR_SUCCESS)
{
throw new CryptographicException(string.Format("BCrypt.BCryptGetProperty() (get size) failed with status code:{0}", status));
}
byte[] value = new byte[size];
status = BCrypt.BCryptGetProperty(hAlg, name, value, value.Length, ref size, 0x0);
if (status != BCrypt.ERROR_SUCCESS)
{
throw new CryptographicException(string.Format("BCrypt.BCryptGetProperty() failed with status code:{0}", status));
}
return(value);
}
// Token: 0x0600000C RID: 12 RVA: 0x00002174 File Offset: 0x00000374
public byte[] Decrypt(byte[] key, byte[] iv, byte[] aad, byte[] cipherText, byte[] authTag)
{
IntPtr intPtr = this.OpenAlgorithmProvider(BCrypt.BCRYPT_AES_ALGORITHM, BCrypt.MS_PRIMITIVE_PROVIDER, BCrypt.BCRYPT_CHAIN_MODE_GCM);
IntPtr hKey;
IntPtr hglobal = this.ImportKey(intPtr, key, out hKey);
BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO bcrypt_AUTHENTICATED_CIPHER_MODE_INFO = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(iv, aad, authTag);
byte[] array2;
using (bcrypt_AUTHENTICATED_CIPHER_MODE_INFO)
{
byte[] array = new byte[this.MaxAuthTagSize(intPtr)];
int num = 0;
uint num2 = BCrypt.BCryptDecrypt(hKey, cipherText, cipherText.Length, ref bcrypt_AUTHENTICATED_CIPHER_MODE_INFO, array, array.Length, null, 0, ref num, 0);
bool flag = num2 > 0U;
if (flag)
{
throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() (get size) failed with status code: {0}", num2));
}
array2 = new byte[num];
num2 = BCrypt.BCryptDecrypt(hKey, cipherText, cipherText.Length, ref bcrypt_AUTHENTICATED_CIPHER_MODE_INFO, array, array.Length, array2, array2.Length, ref num, 0);
bool flag2 = num2 == BCrypt.STATUS_AUTH_TAG_MISMATCH;
if (flag2)
{
throw new CryptographicException("BCrypt.BCryptDecrypt(): authentication tag mismatch");
}
bool flag3 = num2 > 0U;
if (flag3)
{
throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() failed with status code:{0}", num2));
}
}
BCrypt.BCryptDestroyKey(hKey);
Marshal.FreeHGlobal(hglobal);
BCrypt.BCryptCloseAlgorithmProvider(intPtr, 0U);
return(array2);
}
