internal void Encrypt()
{
Contract.Requires(CurrentState == State.Empty || CurrentState == State.Decrypted);
Contract.Ensures(CurrentState == State.Encrypted);
var aes = new AESManaged();
aes.SetEncryptKey(Owner.Credential.SFSEncryptKey, 128);
Contract.Assert(Arch.ArchDefinition.PageSize % AESManaged.AES_BLOCK_SIZE == 0);
for (int i = 0; i < Arch.ArchDefinition.PageSize / AESManaged.AES_BLOCK_SIZE; ++i)
{
var block = Buffer.Slice(i * AESManaged.AES_BLOCK_SIZE, AESManaged.AES_BLOCK_SIZE);
aes.Encrypt(block, block);
}
CurrentState = State.Encrypted;
}
internal void Decrypt()
{
Contract.Requires(CurrentState == State.Verified);
Contract.Ensures(CurrentState == State.Decrypted);
Contract.Ensures(Next == Contract.OldValue(Next));
var aes = new AESManaged();
aes.SetDecryptKey(Owner.Credential.SFSEncryptKey, 128);
Contract.Assert(Arch.ArchDefinition.PageSize % AESManaged.AES_BLOCK_SIZE == 0);
for (int i = 0; i < Arch.ArchDefinition.PageSize / AESManaged.AES_BLOCK_SIZE; ++i)
{
var block = Buffer.Slice(i * AESManaged.AES_BLOCK_SIZE, AESManaged.AES_BLOCK_SIZE);
aes.Decrypt(block, block);
}
CurrentState = State.Decrypted;
}