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Security Fixes 1. Blowfish2 destructor added (blowfish2.h, blowfish2.cc) — zeros PArray and Sboxes on destruction 2. Secure memory zeroing (blowfish.cc, blowfish2.cc) — both destructors now use volatile pointer writes to prevent compiler elision 3. Input validation (blowfish.cc, blowfish2.cc) — initialize() now throws std::invalid_argument for null key, empty key, or key > 56 bytes 4. Copy assignment deleted (blowfish.h) — prevents accidental key material copies 5. Constants moved inside include guards (blowfish.h, blowfish2.h) Code Quality Fixes 6. Typo fixed — BF_SBOX_INT → BF_SBOX_INIT in blowfish.cc 7. CMake standard fixed — blowfish2 target now requires cxx_std_17 instead of cxx_std_14 Test Fixes & Additions 8. Fixed "no fixed points" bug (test_properties.cpp) — L is no longer always 0 9. Eric Young KAT vectors (test_vectors.cpp) — 5 official Blowfish test vectors added 10. Key length tests — min (1 byte), max (56 bytes), and differing lengths 11. Invalid key rejection tests — empty, over-length, and null keys 12. Edge-case blocks — all-zero, all-ones, L==R 13. Key avalanche tests — flipping each key bit produces large ciphertext changes 14. Cross-instance consistency — same key → same output across instances 15. Re-initialization tests — different key after re-init produces different output Assisted-by: Claude Code Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>
66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
// SPDX-FileCopyrightText: 2025 Avinal Kumar avinal.xlvii@gmail.com
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// SPDX-License-Identifier: MIT
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#include "test_framework.h"
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#include <blowfish/blowfish.h>
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static int hamming(uint64_t a, uint64_t b) {
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return __builtin_popcountll(a ^ b);
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}
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// Check that flipping one bit in plaintext
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// causes large, unpredictable changes in ciphertext.
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TEST("Blowfish Plaintext Avalanche Effect") {
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Blowfish bf("key");
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uint32_t L = 0x11223344, R = 0x55667788;
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uint32_t Lc = L, Rc = R;
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bf.encrypt(Lc, Rc);
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uint64_t C1 = (uint64_t(Lc) << 32) | Rc;
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for (int bit = 0; bit < 32; ++bit) {
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uint32_t Lflip = L ^ (1u << bit);
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uint32_t Rflip = R;
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uint32_t L2 = Lflip, R2 = Rflip;
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bf.encrypt(L2, R2);
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uint64_t C2 = (uint64_t(L2) << 32) | R2;
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int hd = hamming(C1, C2);
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EXPECT_TRUE(hd > 20); // Strong avalanche threshold
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}
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}
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// Check that flipping one bit in the key
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// causes large, unpredictable changes in ciphertext.
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TEST("Blowfish Key Avalanche Effect") {
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uint8_t basekey[8] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF};
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uint32_t L = 0x11223344, R = 0x55667788;
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Blowfish bf_base;
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bf_base.initialize(basekey, 8);
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uint32_t Lc = L, Rc = R;
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bf_base.encrypt(Lc, Rc);
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uint64_t C1 = (uint64_t(Lc) << 32) | Rc;
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for (int byte = 0; byte < 8; ++byte) {
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for (int bit = 0; bit < 8; ++bit) {
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uint8_t flipped[8];
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std::copy(basekey, basekey + 8, flipped);
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flipped[byte] ^= (1u << bit);
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Blowfish bf_flip;
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bf_flip.initialize(flipped, 8);
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uint32_t L2 = L, R2 = R;
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bf_flip.encrypt(L2, R2);
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uint64_t C2 = (uint64_t(L2) << 32) | R2;
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int hd = hamming(C1, C2);
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EXPECT_TRUE(hd > 20);
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}
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}
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}
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