diff options
Diffstat (limited to 'nss-tool/enc/enctool.cc')
| -rw-r--r-- | nss-tool/enc/enctool.cc | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/nss-tool/enc/enctool.cc b/nss-tool/enc/enctool.cc new file mode 100644 index 000000000..0e17931a2 --- /dev/null +++ b/nss-tool/enc/enctool.cc @@ -0,0 +1,464 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "enctool.h" +#include "argparse.h" +#include "util.h" + +#include "nss.h" + +#include <assert.h> +#include <chrono> +#include <fstream> +#include <iomanip> +#include <iostream> + +void EncTool::PrintError(const std::string& m, size_t line_number) { + std::cerr << m << " - enctool.cc:" << line_number << std::endl; +} + +void EncTool::PrintError(const std::string& m, PRErrorCode err, + size_t line_number) { + std::cerr << m << " (error " << err << ")" + << " - enctool.cc:" << line_number << std::endl; +} + +void EncTool::PrintBytes(const std::vector<uint8_t>& bytes, + const std::string& txt) { + if (debug_) { + std::cerr << txt << ": "; + for (uint8_t b : bytes) { + std::cerr << std::setfill('0') << std::setw(2) << std::hex + << static_cast<int>(b); + } + std::cerr << std::endl << std::dec; + } +} + +std::vector<uint8_t> EncTool::GenerateRandomness(size_t num_bytes) { + std::vector<uint8_t> bytes(num_bytes); + if (PK11_GenerateRandom(bytes.data(), num_bytes) != SECSuccess) { + PrintError("No randomness available. Abort!", __LINE__); + exit(1); + } + return bytes; +} + +bool EncTool::WriteBytes(const std::vector<uint8_t>& bytes, + std::string out_file) { + std::fstream output(out_file, std::ios::out | std::ios::binary); + if (!output.good()) { + return false; + } + output.write(reinterpret_cast<const char*>( + const_cast<const unsigned char*>(bytes.data())), + bytes.size()); + output.flush(); + output.close(); + return true; +} + +bool EncTool::GetKey(const std::vector<uint8_t>& key_bytes, + ScopedSECItem& key_item) { + if (key_bytes.empty()) { + return false; + } + + // Build key. + key_item = + ScopedSECItem(SECITEM_AllocItem(nullptr, nullptr, key_bytes.size())); + if (!key_item) { + return false; + } + key_item->type = siBuffer; + memcpy(key_item->data, key_bytes.data(), key_bytes.size()); + key_item->len = key_bytes.size(); + + return true; +} + +bool EncTool::GetAesGcmKey(const std::vector<uint8_t>& aad, + const std::vector<uint8_t>& iv_bytes, + const std::vector<uint8_t>& key_bytes, + ScopedSECItem& aes_key, ScopedSECItem& params) { + if (iv_bytes.empty()) { + return false; + } + + // GCM params. + CK_GCM_PARAMS* gcm_params = + static_cast<CK_GCM_PARAMS*>(PORT_Malloc(sizeof(struct CK_GCM_PARAMS))); + if (!gcm_params) { + return false; + } + + uint8_t* iv = static_cast<uint8_t*>(PORT_Malloc(iv_bytes.size())); + if (!iv) { + return false; + } + memcpy(iv, iv_bytes.data(), iv_bytes.size()); + gcm_params->pIv = iv; + gcm_params->ulIvLen = iv_bytes.size(); + gcm_params->ulTagBits = 128; + if (aad.empty()) { + gcm_params->pAAD = nullptr; + gcm_params->ulAADLen = 0; + } else { + uint8_t* ad = static_cast<uint8_t*>(PORT_Malloc(aad.size())); + if (!ad) { + return false; + } + memcpy(ad, aad.data(), aad.size()); + gcm_params->pAAD = ad; + gcm_params->ulAADLen = aad.size(); + } + + params = + ScopedSECItem(SECITEM_AllocItem(nullptr, nullptr, sizeof(*gcm_params))); + if (!params) { + return false; + } + params->len = sizeof(*gcm_params); + params->type = siBuffer; + params->data = reinterpret_cast<unsigned char*>(gcm_params); + + return GetKey(key_bytes, aes_key); +} + +bool EncTool::GenerateAesGcmKey(const std::vector<uint8_t>& aad, + ScopedSECItem& aes_key, ScopedSECItem& params) { + size_t key_size = 16, iv_size = 12; + std::vector<uint8_t> iv_bytes = GenerateRandomness(iv_size); + PrintBytes(iv_bytes, "IV"); + std::vector<uint8_t> key_bytes = GenerateRandomness(key_size); + PrintBytes(key_bytes, "key"); + // Maybe write out the key and parameters. + if (write_key_ && !WriteBytes(key_bytes, key_file_)) { + return false; + } + if (write_iv_ && !WriteBytes(iv_bytes, iv_file_)) { + return false; + } + return GetAesGcmKey(aad, iv_bytes, key_bytes, aes_key, params); +} + +bool EncTool::ReadAesGcmKey(const std::vector<uint8_t>& aad, + ScopedSECItem& aes_key, ScopedSECItem& params) { + std::vector<uint8_t> iv_bytes = ReadInputData(iv_file_); + PrintBytes(iv_bytes, "IV"); + std::vector<uint8_t> key_bytes = ReadInputData(key_file_); + PrintBytes(key_bytes, "key"); + return GetAesGcmKey(aad, iv_bytes, key_bytes, aes_key, params); +} + +bool EncTool::GetChachaKey(const std::vector<uint8_t>& aad, + const std::vector<uint8_t>& iv_bytes, + const std::vector<uint8_t>& key_bytes, + ScopedSECItem& chacha_key, ScopedSECItem& params) { + if (iv_bytes.empty()) { + return false; + } + + // AEAD params. + CK_NSS_AEAD_PARAMS* aead_params = static_cast<CK_NSS_AEAD_PARAMS*>( + PORT_Malloc(sizeof(struct CK_NSS_AEAD_PARAMS))); + if (!aead_params) { + return false; + } + + uint8_t* iv = static_cast<uint8_t*>(PORT_Malloc(iv_bytes.size())); + if (!iv) { + return false; + } + memcpy(iv, iv_bytes.data(), iv_bytes.size()); + aead_params->pNonce = iv; + aead_params->ulNonceLen = iv_bytes.size(); + aead_params->ulTagLen = 16; + if (aad.empty()) { + aead_params->pAAD = nullptr; + aead_params->ulAADLen = 0; + } else { + uint8_t* ad = static_cast<uint8_t*>(PORT_Malloc(aad.size())); + if (!ad) { + return false; + } + memcpy(ad, aad.data(), aad.size()); + aead_params->pAAD = ad; + aead_params->ulAADLen = aad.size(); + } + + params = + ScopedSECItem(SECITEM_AllocItem(nullptr, nullptr, sizeof(*aead_params))); + if (!params) { + return false; + } + params->len = sizeof(*aead_params); + params->type = siBuffer; + params->data = reinterpret_cast<unsigned char*>(aead_params); + + return GetKey(key_bytes, chacha_key); +} + +bool EncTool::GenerateChachaKey(const std::vector<uint8_t>& aad, + ScopedSECItem& chacha_key, + ScopedSECItem& params) { + size_t key_size = 32, iv_size = 12; + std::vector<uint8_t> iv_bytes = GenerateRandomness(iv_size); + PrintBytes(iv_bytes, "IV"); + std::vector<uint8_t> key_bytes = GenerateRandomness(key_size); + PrintBytes(key_bytes, "key"); + // Maybe write out the key and parameters. + if (write_key_ && !WriteBytes(key_bytes, key_file_)) { + return false; + } + if (write_iv_ && !WriteBytes(iv_bytes, iv_file_)) { + return false; + } + return GetChachaKey(aad, iv_bytes, key_bytes, chacha_key, params); +} + +bool EncTool::ReadChachaKey(const std::vector<uint8_t>& aad, + ScopedSECItem& chacha_key, ScopedSECItem& params) { + std::vector<uint8_t> iv_bytes = ReadInputData(iv_file_); + PrintBytes(iv_bytes, "IV"); + std::vector<uint8_t> key_bytes = ReadInputData(key_file_); + PrintBytes(key_bytes, "key"); + return GetChachaKey(aad, iv_bytes, key_bytes, chacha_key, params); +} + +bool EncTool::DoCipher(std::string file_name, std::string out_file, + bool encrypt, key_func_t get_params) { + SECStatus rv; + unsigned int outLen = 0, chunkSize = 1024; + char buffer[chunkSize + 16]; + const unsigned char* bufferStart = + reinterpret_cast<const unsigned char*>(buffer); + + ScopedPK11SlotInfo slot(PK11_GetInternalSlot()); + if (!slot) { + PrintError("Unable to find security device", PR_GetError(), __LINE__); + return SECFailure; + } + + ScopedSECItem key, params; + if (!(this->*get_params)(std::vector<uint8_t>(), key, params)) { + PrintError("Geting keys and params failed.", __LINE__); + return SECFailure; + } + + ScopedPK11SymKey symKey( + PK11_ImportSymKey(slot.get(), cipher_mech_, PK11_OriginUnwrap, + CKA_DECRYPT | CKA_ENCRYPT, key.get(), nullptr)); + if (!symKey) { + PrintError("Failure to import key into NSS", PR_GetError(), __LINE__); + return SECFailure; + } + + std::streambuf* buf; + std::ofstream output_file(out_file, std::ios::out | std::ios::binary); + if (!out_file.empty()) { + if (!output_file.good()) { + return false; + } + buf = output_file.rdbuf(); + } else { + buf = std::cout.rdbuf(); + } + std::ostream output(buf); + + // Read from stdin. + if (file_name.empty()) { + std::vector<uint8_t> data = ReadInputData(""); + uint8_t out[data.size() + 16]; + SECStatus rv; + if (encrypt) { + rv = PK11_Encrypt(symKey.get(), cipher_mech_, params.get(), out, &outLen, + data.size() + 16, data.data(), data.size()); + } else { + rv = PK11_Decrypt(symKey.get(), cipher_mech_, params.get(), out, &outLen, + data.size() + 16, data.data(), data.size()); + } + if (rv != SECSuccess) { + PrintError(encrypt ? "Error encrypting" : "Error decrypting", + PR_GetError(), __LINE__); + return false; + }; + output.write(reinterpret_cast<char*>(out), outLen); + output.flush(); + if (output_file.good()) { + output_file.close(); + } else { + output << std::endl; + } + + std::cerr << "Done " << (encrypt ? "encrypting" : "decrypting") + << std::endl; + return true; + } + + // Read file from file_name. + std::ifstream input(file_name, std::ios::binary); + if (!input.good()) { + return false; + } + uint8_t out[chunkSize + 16]; + while (input) { + if (encrypt) { + input.read(buffer, chunkSize); + rv = PK11_Encrypt(symKey.get(), cipher_mech_, params.get(), out, &outLen, + chunkSize + 16, bufferStart, input.gcount()); + } else { + // We have to read the tag when decrypting. + input.read(buffer, chunkSize + 16); + rv = PK11_Decrypt(symKey.get(), cipher_mech_, params.get(), out, &outLen, + chunkSize + 16, bufferStart, input.gcount()); + } + if (rv != SECSuccess) { + PrintError(encrypt ? "Error encrypting" : "Error decrypting", + PR_GetError(), __LINE__); + return false; + }; + output.write(reinterpret_cast<const char*>(out), outLen); + output.flush(); + } + if (output_file.good()) { + output_file.close(); + } else { + output << std::endl; + } + std::cerr << "Done " << (encrypt ? "encrypting" : "decrypting") << std::endl; + + return true; +} + +size_t EncTool::PrintFileSize(std::string file_name) { + std::ifstream input(file_name, std::ifstream::ate | std::ifstream::binary); + auto size = input.tellg(); + std::cerr << "Size of file to encrypt: " << size / 1024 / 1024 << " MB" + << std::endl; + return size; +} + +bool EncTool::IsValidCommand(ArgParser arguments) { + // Either encrypt or decrypt is fine. + bool valid = arguments.Has("--encrypt") != arguments.Has("--decrypt"); + // An input file is required for decryption only. + valid &= arguments.Has("--in") || arguments.Has("--encrypt"); + // An output file is required for encryption only. + valid &= arguments.Has("--out") || arguments.Has("--decrypt"); + // Files holding the IV and key are required for decryption. + valid &= arguments.Has("--iv") || arguments.Has("--encrypt"); + valid &= arguments.Has("--key") || arguments.Has("--encrypt"); + // Cipher is always required. + valid &= arguments.Has("--cipher"); + return valid; +} + +bool EncTool::Run(const std::vector<std::string>& arguments) { + ArgParser parser(arguments); + + if (!IsValidCommand(parser)) { + Usage(); + return false; + } + + if (NSS_NoDB_Init(nullptr) != SECSuccess) { + PrintError("NSS initialization failed", PR_GetError(), __LINE__); + return false; + } + + if (parser.Has("--debug")) { + debug_ = 1; + } + if (parser.Has("--iv")) { + iv_file_ = parser.Get("--iv"); + } else { + write_iv_ = false; + } + if (parser.Has("--key")) { + key_file_ = parser.Get("--key"); + } else { + write_key_ = false; + } + + key_func_t get_params; + bool encrypt = parser.Has("--encrypt"); + if (parser.Get("--cipher") == kAESCommand) { + cipher_mech_ = CKM_AES_GCM; + if (encrypt) { + get_params = &EncTool::GenerateAesGcmKey; + } else { + get_params = &EncTool::ReadAesGcmKey; + } + } else if (parser.Get("--cipher") == kChaChaCommand) { + cipher_mech_ = CKM_NSS_CHACHA20_POLY1305; + if (encrypt) { + get_params = &EncTool::GenerateChachaKey; + } else { + get_params = &EncTool::ReadChachaKey; + } + } else { + Usage(); + return false; + } + // Don't write out key and iv when decrypting. + if (!encrypt) { + write_key_ = false; + write_iv_ = false; + } + + std::string input_file = parser.Has("--in") ? parser.Get("--in") : ""; + std::string output_file = parser.Has("--out") ? parser.Get("--out") : ""; + size_t file_size = 0; + if (!input_file.empty()) { + file_size = PrintFileSize(input_file); + } + auto begin = std::chrono::high_resolution_clock::now(); + if (!DoCipher(input_file, output_file, encrypt, get_params)) { + (void)NSS_Shutdown(); + return false; + } + auto end = std::chrono::high_resolution_clock::now(); + auto ns = + std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin).count(); + auto seconds = ns / 1000000000; + std::cerr << ns << " ns (~" << seconds << " s) and " << std::endl; + std::cerr << "That's approximately " << (double)file_size / ns << " b/ns" + << std::endl; + + if (NSS_Shutdown() != SECSuccess) { + return false; + } + + return true; +} + +void EncTool::Usage() { + std::string const txt = R"~( +Usage: nss encrypt|decrypt --cipher aes|chacha [--in <file>] [--out <file>] + [--key <file>] [--iv <file>] + + --cipher Set the cipher to use. + --cipher aes: Use AES-GCM to encrypt/decrypt. + --cipher chacha: Use ChaCha20/Poly1305 to encrypt/decrypt. + --in The file to encrypt/decrypt. If no file is given, we read + from stdin (only when encrypting). + --out The file to write the ciphertext/plaintext to. If no file + is given we write the plaintext to stdout (only when + decrypting). + --key The file to write the used key to/to read the key + from. Optional parameter. When not given, don't write out + the key. + --iv The file to write the used IV to/to read the IV + from. Optional parameter. When not given, don't write out + the IV. + + Examples: + nss encrypt --cipher aes --iv iv --key key --out ciphertext + nss decrypt --cipher chacha --iv iv --key key --in ciphertex + + Note: This tool overrides files without asking. +)~"; + std::cerr << txt << std::endl; +} |