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APT: implement Wrap and Unwrap
This commit is contained in:
wwylele
parent
ea1ea0224c
commit
d5b0e275e3
5 changed files with 149 additions and 6 deletions
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@ -18,6 +18,8 @@
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#include "core/hle/service/fs/archive.h"
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#include "core/hle/service/ptm/ptm.h"
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#include "core/hle/service/service.h"
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#include "core/hw/aes/ccm.h"
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#include "core/hw/aes/key.h"
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namespace Service {
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namespace APT {
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@ -470,6 +472,107 @@ void GetStartupArgument(Service::Interface* self) {
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cmd_buff[2] = 0;
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}
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void Wrap(Service::Interface* self) {
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IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x46, 4, 4);
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const u32 output_size = rp.Pop<u32>();
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const u32 input_size = rp.Pop<u32>();
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const u32 nonce_offset = rp.Pop<u32>();
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u32 nonce_size = rp.Pop<u32>();
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size_t desc_size;
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IPC::MappedBufferPermissions desc_permission;
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const VAddr input = rp.PopMappedBuffer(&desc_size, &desc_permission);
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ASSERT(desc_size == input_size && desc_permission == IPC::MappedBufferPermissions::R);
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const VAddr output = rp.PopMappedBuffer(&desc_size, &desc_permission);
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ASSERT(desc_size == output_size && desc_permission == IPC::MappedBufferPermissions::W);
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// Note: real 3DS still returns SUCCESS when the sizes don't match. It seems that it doesn't
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// check the buffer size and writes data with potential overflow.
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ASSERT_MSG(output_size == input_size + HW::AES::CCM_MAC_SIZE,
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"input_size (%d) doesn't match to output_size (%d)", input_size, output_size);
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LOG_DEBUG(Service_APT, "called, output_size=%u, input_size=%u, nonce_offset=%u, nonce_size=%u",
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output_size, input_size, nonce_offset, nonce_size);
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// Note: This weird nonce size modification is verified against real 3DS
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nonce_size = std::min<u32>(nonce_size & ~3, HW::AES::CCM_NONCE_SIZE);
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// Reads nonce and concatenates the rest of the input as plaintext
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HW::AES::CCMNonce nonce{};
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Memory::ReadBlock(input + nonce_offset, nonce.data(), nonce_size);
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u32 pdata_size = input_size - nonce_size;
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std::vector<u8> pdata(pdata_size);
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Memory::ReadBlock(input, pdata.data(), nonce_offset);
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Memory::ReadBlock(input + nonce_offset + nonce_size, pdata.data() + nonce_offset,
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pdata_size - nonce_offset);
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// Encrypts the plaintext using AES-CCM
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auto cipher = HW::AES::EncryptSignCCM(pdata, nonce, HW::AES::KeySlotID::APTWrap);
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// Puts the nonce to the beginning of the output, with ciphertext followed
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Memory::WriteBlock(output, nonce.data(), nonce_size);
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Memory::WriteBlock(output + nonce_size, cipher.data(), cipher.size());
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 4);
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rb.Push(RESULT_SUCCESS);
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// Unmap buffer
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rb.PushMappedBuffer(input, input_size, IPC::MappedBufferPermissions::R);
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rb.PushMappedBuffer(output, output_size, IPC::MappedBufferPermissions::W);
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}
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void Unwrap(Service::Interface* self) {
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IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x47, 4, 4);
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const u32 output_size = rp.Pop<u32>();
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const u32 input_size = rp.Pop<u32>();
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const u32 nonce_offset = rp.Pop<u32>();
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u32 nonce_size = rp.Pop<u32>();
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size_t desc_size;
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IPC::MappedBufferPermissions desc_permission;
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const VAddr input = rp.PopMappedBuffer(&desc_size, &desc_permission);
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ASSERT(desc_size == input_size && desc_permission == IPC::MappedBufferPermissions::R);
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const VAddr output = rp.PopMappedBuffer(&desc_size, &desc_permission);
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ASSERT(desc_size == output_size && desc_permission == IPC::MappedBufferPermissions::W);
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// Note: real 3DS still returns SUCCESS when the sizes don't match. It seems that it doesn't
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// check the buffer size and writes data with potential overflow.
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ASSERT_MSG(output_size == input_size - HW::AES::CCM_MAC_SIZE,
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"input_size (%d) doesn't match to output_size (%d)", input_size, output_size);
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LOG_DEBUG(Service_APT, "called, output_size=%u, input_size=%u, nonce_offset=%u, nonce_size=%u",
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output_size, input_size, nonce_offset, nonce_size);
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// Note: This weird nonce size modification is verified against real 3DS
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nonce_size = std::min<u32>(nonce_size & ~3, HW::AES::CCM_NONCE_SIZE);
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// Reads nonce and cipher text
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HW::AES::CCMNonce nonce{};
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Memory::ReadBlock(input, nonce.data(), nonce_size);
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u32 cipher_size = input_size - nonce_size;
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std::vector<u8> cipher(cipher_size);
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Memory::ReadBlock(input + nonce_size, cipher.data(), cipher_size);
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// Decrypts the ciphertext using AES-CCM
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auto pdata = HW::AES::DecryptVerifyCCM(cipher, nonce, HW::AES::KeySlotID::APTWrap);
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
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if (!pdata.empty()) {
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// Splits the plaintext and put the nonce in between
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Memory::WriteBlock(output, pdata.data(), nonce_offset);
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Memory::WriteBlock(output + nonce_offset, nonce.data(), nonce_size);
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Memory::WriteBlock(output + nonce_offset + nonce_size, pdata.data() + nonce_offset,
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pdata.size() - nonce_offset);
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rb.Push(RESULT_SUCCESS);
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} else {
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LOG_ERROR(Service_APT, "Failed to decrypt data");
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rb.Push(ResultCode(static_cast<ErrorDescription>(1), ErrorModule::PS,
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ErrorSummary::WrongArgument, ErrorLevel::Status));
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}
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// Unmap buffer
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rb.PushMappedBuffer(input, input_size, IPC::MappedBufferPermissions::R);
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rb.PushMappedBuffer(output, output_size, IPC::MappedBufferPermissions::W);
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}
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void CheckNew3DSApp(Service::Interface* self) {
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u32* cmd_buff = Kernel::GetCommandBuffer();
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@ -136,6 +136,46 @@ void Initialize(Service::Interface* self);
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*/
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void GetSharedFont(Service::Interface* self);
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/**
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* APT::Wrap service function
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* Inputs:
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* 1 : Output buffer size
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* 2 : Input buffer size
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* 3 : Nonce offset to the input buffer
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* 4 : Nonce size
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* 5 : Buffer mapping descriptor ((input_buffer_size << 4) | 0xA)
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* 6 : Input buffer address
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* 7 : Buffer mapping descriptor ((input_buffer_size << 4) | 0xC)
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* 8 : Output buffer address
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* Outputs:
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* 1 : Result of function, 0 on success, otherwise error code
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* 2 : Buffer unmapping descriptor ((input_buffer_size << 4) | 0xA)
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* 3 : Input buffer address
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* 4 : Buffer unmapping descriptor ((input_buffer_size << 4) | 0xC)
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* 5 : Output buffer address
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*/
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void Wrap(Service::Interface* self);
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/**
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* APT::Unwrap service function
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* Inputs:
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* 1 : Output buffer size
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* 2 : Input buffer size
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* 3 : Nonce offset to the output buffer
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* 4 : Nonce size
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* 5 : Buffer mapping descriptor ((input_buffer_size << 4) | 0xA)
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* 6 : Input buffer address
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* 7 : Buffer mapping descriptor ((input_buffer_size << 4) | 0xC)
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* 8 : Output buffer address
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* Outputs:
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* 1 : Result of function, 0 on success, otherwise error code
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* 2 : Buffer unmapping descriptor ((input_buffer_size << 4) | 0xA)
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* 3 : Input buffer address
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* 4 : Buffer unmapping descriptor ((input_buffer_size << 4) | 0xC)
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* 5 : Output buffer address
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*/
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void Unwrap(Service::Interface* self);
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/**
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* APT::NotifyToWait service function
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* Inputs:
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@ -78,8 +78,8 @@ const Interface::FunctionInfo FunctionTable[] = {
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{0x00430040, NotifyToWait, "NotifyToWait"},
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{0x00440000, GetSharedFont, "GetSharedFont"},
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{0x00450040, nullptr, "GetWirelessRebootInfo"},
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{0x00460104, nullptr, "Wrap"},
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{0x00470104, nullptr, "Unwrap"},
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{0x00460104, Wrap, "Wrap"},
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{0x00470104, Unwrap, "Unwrap"},
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{0x00480100, nullptr, "GetProgramInfo"},
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{0x00490180, nullptr, "Reboot"},
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{0x004A0040, nullptr, "GetCaptureInfo"},
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@ -78,8 +78,8 @@ const Interface::FunctionInfo FunctionTable[] = {
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{0x00430040, NotifyToWait, "NotifyToWait"},
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{0x00440000, GetSharedFont, "GetSharedFont"},
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{0x00450040, nullptr, "GetWirelessRebootInfo"},
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{0x00460104, nullptr, "Wrap"},
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{0x00470104, nullptr, "Unwrap"},
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{0x00460104, Wrap, "Wrap"},
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{0x00470104, Unwrap, "Unwrap"},
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{0x00480100, nullptr, "GetProgramInfo"},
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{0x00490180, nullptr, "Reboot"},
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{0x004A0040, nullptr, "GetCaptureInfo"},
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@ -78,8 +78,8 @@ const Interface::FunctionInfo FunctionTable[] = {
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{0x00430040, NotifyToWait, "NotifyToWait"},
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{0x00440000, GetSharedFont, "GetSharedFont"},
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{0x00450040, nullptr, "GetWirelessRebootInfo"},
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{0x00460104, nullptr, "Wrap"},
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{0x00470104, nullptr, "Unwrap"},
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{0x00460104, Wrap, "Wrap"},
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{0x00470104, Unwrap, "Unwrap"},
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{0x00480100, nullptr, "GetProgramInfo"},
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{0x00490180, nullptr, "Reboot"},
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{0x004A0040, nullptr, "GetCaptureInfo"},
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