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https://github.com/RGBCube/serenity
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LibCrypto: Move each subsection into its own namespace
This commit is contained in:
AnotherTest
Andreas Kling
parent
96dd7c2996
commit
4f89a377a4
9 changed files with 3256 additions and 3228 deletions
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@ -29,86 +29,89 @@
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#include <LibCrypto/Cipher/Mode/Mode.h>
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namespace Crypto {
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namespace Cipher {
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template <typename T>
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class CBC : public Mode<T> {
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public:
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template <typename... Args>
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explicit constexpr CBC<T>(Args... args)
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: Mode<T>(args...)
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{
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}
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virtual Optional<ByteBuffer> encrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) override
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{
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auto length = in.size();
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if (length == 0)
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return {};
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auto& cipher = this->cipher();
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// FIXME: We should have two of these encrypt/decrypt functions that
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// we SFINAE out based on whether the Cipher mode needs an ivec
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ASSERT(ivec.has_value());
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const auto* iv = ivec.value().data();
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typename T::BlockType block { cipher.padding_mode() };
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size_t offset { 0 };
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auto block_size = cipher.block_size();
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while (length >= block_size) {
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block.overwrite(in.slice_view(offset, block_size));
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block.apply_initialization_vector(iv);
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cipher.encrypt_block(block, block);
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out.overwrite(offset, block.get().data(), block_size);
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iv = out.offset_pointer(offset);
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length -= block_size;
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offset += block_size;
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template <typename T>
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class CBC : public Mode<T> {
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public:
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template <typename... Args>
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explicit constexpr CBC<T>(Args... args)
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: Mode<T>(args...)
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{
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}
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if (length > 0) {
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block.overwrite(in.slice_view(offset, length));
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block.apply_initialization_vector(iv);
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cipher.encrypt_block(block, block);
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out.overwrite(offset, block.get().data(), block_size);
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iv = out.offset_pointer(offset);
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virtual Optional<ByteBuffer> encrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) override
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{
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auto length = in.size();
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if (length == 0)
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return {};
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auto& cipher = this->cipher();
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// FIXME: We should have two of these encrypt/decrypt functions that
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// we SFINAE out based on whether the Cipher mode needs an ivec
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ASSERT(ivec.has_value());
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const auto* iv = ivec.value().data();
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typename T::BlockType block { cipher.padding_mode() };
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size_t offset { 0 };
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auto block_size = cipher.block_size();
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while (length >= block_size) {
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block.overwrite(in.slice_view(offset, block_size));
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block.apply_initialization_vector(iv);
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cipher.encrypt_block(block, block);
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out.overwrite(offset, block.get().data(), block_size);
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iv = out.offset_pointer(offset);
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length -= block_size;
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offset += block_size;
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}
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if (length > 0) {
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block.overwrite(in.slice_view(offset, length));
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block.apply_initialization_vector(iv);
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cipher.encrypt_block(block, block);
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out.overwrite(offset, block.get().data(), block_size);
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iv = out.offset_pointer(offset);
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}
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return ByteBuffer::copy(iv, block_size);
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}
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virtual void decrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) override
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{
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auto length = in.size();
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if (length == 0)
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return;
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return ByteBuffer::copy(iv, block_size);
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}
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virtual void decrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) override
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{
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auto length = in.size();
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if (length == 0)
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return;
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auto& cipher = this->cipher();
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auto& cipher = this->cipher();
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ASSERT(ivec.has_value());
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const auto* iv = ivec.value().data();
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ASSERT(ivec.has_value());
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const auto* iv = ivec.value().data();
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auto block_size = cipher.block_size();
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auto block_size = cipher.block_size();
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// if the data is not aligned, it's not correct encrypted data
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// FIXME (ponder): Should we simply decrypt as much as we can?
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ASSERT(length % block_size == 0);
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// if the data is not aligned, it's not correct encrypted data
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// FIXME (ponder): Should we simply decrypt as much as we can?
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ASSERT(length % block_size == 0);
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typename T::BlockType block { cipher.padding_mode() };
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size_t offset { 0 };
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typename T::BlockType block { cipher.padding_mode() };
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size_t offset { 0 };
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while (length > 0) {
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auto* slice = in.offset_pointer(offset);
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block.overwrite(slice, block_size);
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cipher.decrypt_block(block, block);
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block.apply_initialization_vector(iv);
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auto decrypted = block.get();
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out.overwrite(offset, decrypted.data(), decrypted.size());
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iv = slice;
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length -= block_size;
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offset += block_size;
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while (length > 0) {
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auto* slice = in.offset_pointer(offset);
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block.overwrite(slice, block_size);
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cipher.decrypt_block(block, block);
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block.apply_initialization_vector(iv);
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auto decrypted = block.get();
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out.overwrite(offset, decrypted.data(), decrypted.size());
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iv = slice;
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length -= block_size;
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offset += block_size;
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}
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this->prune_padding(out);
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}
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this->prune_padding(out);
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}
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};
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};
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}
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}
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@ -30,68 +30,71 @@
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#include <LibCrypto/Cipher/Cipher.h>
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namespace Crypto {
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namespace Cipher {
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template <typename T>
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class Mode {
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public:
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// FIXME: Somehow communicate that encrypt returns the last initialization vector (if the mode supports it)
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virtual Optional<ByteBuffer> encrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) = 0;
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virtual void decrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) = 0;
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template <typename T>
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class Mode {
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public:
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// FIXME: Somehow communicate that encrypt returns the last initialization vector (if the mode supports it)
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virtual Optional<ByteBuffer> encrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) = 0;
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virtual void decrypt(const ByteBuffer& in, ByteBuffer& out, Optional<ByteBuffer> ivec = {}) = 0;
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const T& cipher() const { return m_cipher; }
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const T& cipher() const { return m_cipher; }
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ByteBuffer create_aligned_buffer(size_t input_size) const
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{
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size_t remainder = (input_size + T::block_size()) % T::block_size();
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if (remainder == 0)
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return ByteBuffer::create_uninitialized(input_size);
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else
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return ByteBuffer::create_uninitialized(input_size + T::block_size() - remainder);
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}
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ByteBuffer create_aligned_buffer(size_t input_size) const
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{
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size_t remainder = (input_size + T::block_size()) % T::block_size();
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if (remainder == 0)
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return ByteBuffer::create_uninitialized(input_size);
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else
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return ByteBuffer::create_uninitialized(input_size + T::block_size() - remainder);
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}
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protected:
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T& cipher() { return m_cipher; }
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protected:
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T& cipher() { return m_cipher; }
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virtual void prune_padding(ByteBuffer& data)
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{
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auto size = data.size();
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switch (m_cipher.padding_mode()) {
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case PaddingMode::CMS: {
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auto maybe_padding_length = data[size - 1];
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if (maybe_padding_length >= T::block_size()) {
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// cannot be padding (the entire block cannot be padding)
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return;
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}
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for (auto i = maybe_padding_length; i > 0; --i) {
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if (data[size - i] != maybe_padding_length) {
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// not padding, part of data
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virtual void prune_padding(ByteBuffer& data)
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{
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auto size = data.size();
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switch (m_cipher.padding_mode()) {
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case PaddingMode::CMS: {
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auto maybe_padding_length = data[size - 1];
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if (maybe_padding_length >= T::block_size()) {
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// cannot be padding (the entire block cannot be padding)
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return;
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}
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for (auto i = maybe_padding_length; i > 0; --i) {
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if (data[size - i] != maybe_padding_length) {
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// not padding, part of data
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return;
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}
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}
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data.trim(size - maybe_padding_length);
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break;
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}
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case PaddingMode::Null: {
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while (data[size - 1] == 0)
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--size;
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data.trim(size);
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break;
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}
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default:
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// FIXME: support other padding modes
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ASSERT_NOT_REACHED();
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break;
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}
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data.trim(size - maybe_padding_length);
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break;
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}
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case PaddingMode::Null: {
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while (data[size - 1] == 0)
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--size;
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data.trim(size);
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break;
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}
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default:
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// FIXME: support other padding modes
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ASSERT_NOT_REACHED();
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break;
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}
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}
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// FIXME: Somehow add a reference version of this
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template <typename... Args>
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Mode(Args... args)
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: m_cipher(args...)
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{
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}
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// FIXME: Somehow add a reference version of this
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template <typename... Args>
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Mode(Args... args)
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: m_cipher(args...)
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{
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}
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private:
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T m_cipher;
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};
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}
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private:
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T m_cipher;
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};
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}
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