167 lines
7.5 KiB
C++
167 lines
7.5 KiB
C++
#pragma once
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/**
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0.
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*/
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#include <aws/cal/symmetric_cipher.h>
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#include <aws/crt/Exports.h>
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#include <aws/crt/Types.h>
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struct aws_symmetric_cipher;
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namespace Aws
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{
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namespace Crt
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{
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namespace Crypto
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{
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static const size_t AES_256_CIPHER_BLOCK_SIZE = 16u;
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static const size_t AES_256_KEY_SIZE_BYTES = 32u;
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enum class SymmetricCipherState
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{
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Ready = AWS_SYMMETRIC_CIPHER_READY,
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Finalized = AWS_SYMMETRIC_CIPHER_FINALIZED,
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Error = AWS_SYMMETRIC_CIPHER_ERROR,
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};
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class AWS_CRT_CPP_API SymmetricCipher final
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{
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public:
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SymmetricCipher(const SymmetricCipher &) = delete;
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SymmetricCipher &operator=(const SymmetricCipher &) = delete;
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SymmetricCipher(SymmetricCipher &&) noexcept = default;
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SymmetricCipher &operator=(SymmetricCipher &&) noexcept = default;
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/**
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* Creates an AES 256 CBC mode cipher using a provided key and iv.
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* Key must be 32 bytes. If key or iv are not provided, they will be generated.
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*/
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static SymmetricCipher CreateAES_256_CBC_Cipher(
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const Optional<ByteCursor> &key = Optional<ByteCursor>(),
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const Optional<ByteCursor> &iv = Optional<ByteCursor>(),
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Allocator *allocator = ApiAllocator()) noexcept;
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/**
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* Creates an AES 256 CTR mode cipher using a provided key and iv.
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* If key and iv are not provided, they will be generated.
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*/
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static SymmetricCipher CreateAES_256_CTR_Cipher(
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const Optional<ByteCursor> &key = Optional<ByteCursor>(),
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const Optional<ByteCursor> &iv = Optional<ByteCursor>(),
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Allocator *allocator = ApiAllocator()) noexcept;
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/**
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* Creates an AES 256 GCM mode cipher using a provided key, iv, tag, and aad if provided.
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* Key and iv will be generated if not provided.
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* AAD values are not generated.
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* Provide AAD if you need to provide additional auth info.
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*/
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static SymmetricCipher CreateAES_256_GCM_Cipher(
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const Optional<ByteCursor> &key = Optional<ByteCursor>(),
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const Optional<ByteCursor> &iv = Optional<ByteCursor>(),
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const Optional<ByteCursor> &aad = Optional<ByteCursor>(),
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Allocator *allocator = ApiAllocator()) noexcept;
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/**
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* Creates an AES 256 Keywrap mode cipher using key if provided.
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* If a key is not provided, one will be generated.
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*/
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static SymmetricCipher CreateAES_256_KeyWrap_Cipher(
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const Optional<ByteCursor> &key = Optional<ByteCursor>(),
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Allocator *allocator = ApiAllocator()) noexcept;
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/**
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* Returns true if the instance is in a valid state, false otherwise.
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*/
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operator bool() const noexcept;
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/**
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* Returns current state of the cipher instance. ready to be used, finalized, or in a error state.
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* If the cipher is in a finalized or error state it may not be used anymore
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**/
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SymmetricCipherState GetState() const noexcept;
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/**
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* Returns the value of the last aws error encountered by operations on this instance.
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*/
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inline int LastError() const noexcept { return m_lastError; }
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/**
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* Encrypts the value in toEncrypt and stores any immediate results in out. Out can be dynamically
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* re-sized if out is a dynamic byte buf. Otherwise, make sure the size of out is at least 2 blocks
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* larger than the input to allow for padding.
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*
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* Returns true on success. Call
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* LastError() for the reason this call failed.
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*/
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bool Encrypt(const ByteCursor &toEncrypt, ByteBuf &out) noexcept;
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/**
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* Encrypts any remaining data on the cipher and stores the output in out. Out can be dynamically
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* re-sized if out is a dynamic byte buf. Otherwise, make sure the size of out is at least 2 blocks
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* for CBC, CTR, and GCM modes and 40 bytes for KeyWrap.
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*
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* Returns true on success. Call
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* LastError() for the reason this call failed.
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*/
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bool FinalizeEncryption(ByteBuf &out) noexcept;
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/**
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* Decrypts the value in toEncrypt and stores any immediate results in out. Out can be dynamically
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* re-sized if out is a dynamic byte buf. Otherwise, make sure the size of out is at least 1 block
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* larger than the input to allow for padding. Returns true on success. Call LastError() for the reason
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* this call failed.
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*/
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bool Decrypt(const ByteCursor &toDecrypt, ByteBuf &out) noexcept;
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/**
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* Decrypts any remaining data on the cipher and stores the output in out. Out can be dynamically
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* re-sized if out is a dynamic byte buf. Otherwise, make sure the size of out is at least 2 blocks
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* for CBC, CTR, GCM, and Keywrap modes.
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*
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* Returns true on success. Call
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* LastError() for the reason this call failed.
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*/
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bool FinalizeDecryption(ByteBuf &out) noexcept;
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/**
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* Reset to cipher to new state.
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*/
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bool Reset() noexcept;
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/**
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* Returns the key used for this cipher. This key is not copied from the cipher so do not mutate this
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* data. Copy if you need to pass it around anywhere.
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*/
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ByteCursor GetKey() const noexcept;
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/**
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* Returns the initialization vector used for this cipher.
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* This IV is not copied from the cipher so do not mutate this
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* data. Copy if you need to pass it around anywhere.
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*/
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ByteCursor GetIV() const noexcept;
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/**
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* Returns the encryption tag generated during encryption operations for this cipher in GCM mode.
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* This tag is not copied from the cipher so do not mutate this
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* data. Copy if you need to pass it around anywhere.
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*/
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ByteCursor GetTag() const noexcept;
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/**
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* Sets the tag used during decryption operations for this cipher in GCM mode.
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* No-op outside of GCM mode. In GCM mode, encrypt operation overrides the value of the tag.
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*/
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void SetTag(ByteCursor tag) const noexcept;
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private:
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SymmetricCipher(aws_symmetric_cipher *cipher) noexcept;
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ScopedResource<struct aws_symmetric_cipher> m_cipher;
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int m_lastError;
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};
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} // namespace Crypto
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} // namespace Crt
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} // namespace Aws
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