b4df5d078a
ARM backends: fix round key byte-swap on little-endian (vrev32q_u8), rewrite decrypt to pre-process middle keys with InvMixColumns, fix GHASH PMULL reflect and reduction ordering. API: add nonce/IV-generating convenience overloads for CTR, CBC, and GCM (library generates and prepends nonce, appends tag). Add C API for IV/nonce generation. Rename error codes (TINYAES_OK, Result::Ok, Result::AuthenticationFailed, etc.). Build: add MinGW GCC AVX-512 debug alignment fix, harden bench/fuzz CMake targets (warnings-as-errors, linker hardening), align with tinysha CMake conventions. Add README. Tests: expand coverage for nonce-generating API overloads, add NIST GCM test vectors, improve fuzz target differential testing.
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// Copyright (c) 2025-2026, Brandon Lehmann
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// BSD 3-Clause License (see LICENSE)
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#include "tinyaes/cbc.h"
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#include "internal/aes_impl.h"
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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// Differential: verify portable encrypt_block matches dispatched for each block
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static void diff_encrypt_block(const uint8_t *key, size_t key_len, const uint8_t block[16])
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{
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int rounds = tinyaes::internal::aes_rounds(key_len);
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if (rounds == 0)
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return;
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uint32_t rk[tinyaes::internal::AES_MAX_RK_WORDS];
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tinyaes::internal::aes_key_expand_portable(key, key_len, rk);
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uint8_t out_portable[16], out_dispatch[16];
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tinyaes::internal::aes_encrypt_block_portable(rk, rounds, block, out_portable);
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tinyaes::internal::get_encrypt_block()(rk, rounds, block, out_dispatch);
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assert(std::memcmp(out_portable, out_dispatch, 16) == 0);
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
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{
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if (size < 2)
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return 0;
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// First byte selects key size: 16, 24, or 32
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static const size_t key_sizes[] = {16, 24, 32};
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size_t key_len = key_sizes[data[0] % 3];
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data++;
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size--;
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if (size < key_len + 16 + 1)
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return 0;
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std::vector<uint8_t> key(data, data + key_len);
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std::vector<uint8_t> iv(data + key_len, data + key_len + 16);
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size_t remaining = size - key_len - 16;
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if (remaining == 0)
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return 0;
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std::vector<uint8_t> plaintext(data + key_len + 16, data + size);
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std::vector<uint8_t> ct, pt;
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auto result = tinyaes::cbc_encrypt_pkcs7(key, iv, plaintext, ct);
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if (result != tinyaes::Result::Ok)
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return 0;
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result = tinyaes::cbc_decrypt_pkcs7(key, iv, ct, pt);
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assert(result == tinyaes::Result::Ok);
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assert(pt == plaintext);
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// Differential: compare portable vs dispatched on a single block from the input
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diff_encrypt_block(data, key_len, data + key_len);
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return 0;
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}
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