v2.1.7: Zupt is now licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0-or-later) + VaptVupt v2.46.1(GPLv3)
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AUDIT.md
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AUDIT.md
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# Security Audit — Zupt v2.0.0
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# Security Audit — Zupt v2.1.7
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**Date:** March 29, 2026
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**Date:** April 26, 2026
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**Author:** Cristian Cezar Moisés
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**Audit type:** Self-audit with formal verification (Jasmin CT proofs, ACSL contracts) and NIST/RFC test vectors
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**Status:** No independent third-party audit performed
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**License (audit covers):** AGPL-3.0-or-later (Zupt core), GPL-3.0-or-later (VaptVupt codec) — commercial: sac@securityops.co
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---
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## 1. Cryptographic Test Vector Verification
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## 1. Cryptographic Test Vector Verification — re-validated on v2.1.7
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All primitives tested against published reference vectors:
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All primitives re-tested against published reference vectors after the v2.1.7 relicense. Identical results to v2.0.0 — as expected, since the relicense did not modify any cryptographic code paths.
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| Primitive | Standard | Vectors | Status |
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|-----------|----------|---------|--------|
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| Primitive | Standard | Vectors | v2.1.7 Status |
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|-----------|----------|---------|---------------|
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| SHA-256 | FIPS 180-4 | 3 (empty, "abc", 448-bit) | **PASS** |
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| HMAC-SHA256 | RFC 4231 | 2 (TC2: "Jefe", TC3: 20×0xAA) | **PASS** |
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| SHA3-256 | FIPS 202 | 2 (empty, "abc") | **PASS** |
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| SHAKE-128 | FIPS 202 | 1 (empty, 128-bit output) | **PASS** |
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| X25519 | RFC 7748 §5.2 | 2 (both test vectors) | **PASS** |
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| X25519 | RFC 7748 §6.1 | 2 (TV1, TV2) | **PASS** |
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| ML-KEM-768 | FIPS 203 | 2 (5-trial roundtrip + implicit rejection) | **PASS** |
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| XXH64 | xxHash spec | 1 (empty string, seed=0) | **PASS** |
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| **Total** | | **13** | **13/13 PASS** |
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Reproduction: `make test-vectors && ./test_vectors`
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## 2. Jasmin Constant-Time Verification
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| Function | Purpose | Status |
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|----------|---------|--------|
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| Function | Purpose | v2.1.7 Status |
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|----------|---------|---------------|
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| `zupt_mac_verify_ct` | HMAC comparison | **✅ Linked, CT-proven** |
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| `zupt_ct_select_32` | ML-KEM FO select | **✅ Linked, CT-proven** |
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| `zupt_fe_cswap` | X25519 conditional swap | **✅ Linked, CT-proven** |
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| `zupt_aes256_blk` | AES-256 single-block (AES-NI) | **✅ Linked, CT by hardware** |
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| `zupt_aes256_ctr4` | AES-256 4-block pipeline | **✅ Linked, CT by hardware** |
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| `zupt_fe_cswap` | X25519 conditional swap | **⚠ Not yet linked** (limb representation mismatch: 5×u51 vs 4×u64) |
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| `zupt_aes256_blk` | AES-256 single-block (AES-NI) | **⚠ Not yet linked** (Jasmin stack offset bug: `[rsp+1]` instead of `[rsp+16]`) |
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The two unwired functions remain on the v1.6+ roadmap; their fallback implementations (C masked XOR for `fe_cswap`, C T-table AES for `aes256_blk`) are functionally correct and continue to be the production code path.
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## 3. ACSL Formal Annotations
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19 security-critical functions annotated with `requires/ensures/assigns` contracts.
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Target: `frama-c -wp -wp-rte -wp-model Typed+Cast`
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## 4. Security Hardening
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## 4. Security Hardening — current status
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| Feature | Status |
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|---------|--------|
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| mlock() key protection | **✅ Active** |
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| Feature | v2.1.7 Status |
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|---------|---------------|
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| `mlock()` key protection | **✅ Active** |
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| Buffer canaries (keyring) | **✅ Active** |
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| Always-decrypt timing mitigation | **✅ Active** |
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| AFL++ fuzz harnesses | **✅ Available** (`make fuzz-build`) |
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| TOCTOU mitigation (`fstat` on fd, not `stat` on path) | **✅ Active** (since v2.1.4) |
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| X25519 scalar wipe via `volatile` | **✅ Active** (since v2.1.4) |
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| Password strength warnings | **✅ Active** (since v2.1.6) |
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| Block-level deduplication with content verification | **✅ Active** (since v2.1.5) |
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## 5. VaptVupt Codec Tests
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## 5. VaptVupt Codec Tests — re-validated on v2.1.7
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| Test | Status |
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|------|--------|
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| Roundtrip all 3 modes (UF/BAL/EXT) | **PASS** |
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| Roundtrip + AES-256 encryption | **PASS** |
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| Roundtrip + PQ hybrid encryption | **PASS** |
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| Roundtrip + multi-threaded | **PASS** |
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| Roundtrip + solid mode | **PASS** |
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| Test | v2.1.7 Status |
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|------|---------------|
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| Roundtrip text mode 0 / 1 / 2 (each 64 KB) | **PASS** (3) |
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| Roundtrip binary mode 1 (128 KB) | **PASS** |
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| Incompressible fallback to store | **PASS** |
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| Empty/small input | **PASS** |
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| Multi-block (2 MB) | **PASS** |
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| Empty / small input (3 bytes) | **PASS** (2) |
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| `vv_xxh64` ↔ `zupt_xxh64` alias | **PASS** |
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| Roundtrip large 2 MB (mode 1) | **PASS** |
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| RLE-like data roundtrip | **PASS** |
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| `window_log=20` roundtrip | **PASS** |
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| **Total** | **11/11 PASS** |
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| Suite | Tests | Result | What It Covers |
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|-------|-------|--------|----------------|
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| Regression | 16 | **16/16 PASS** | All codecs, modes, encryption, edge cases, corruption detection |
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| Multi-threaded | 14 | **14/14 PASS** | N=1/2/4/8 threads, large files, 1000 files, MT+encryption |
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| Post-quantum | 10 | **10/10 PASS** | Keygen, PQ encrypt/decrypt, wrong key, password compat, PQ+MT, 2MB |
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| Quick smoke | 9 | **9/9 PASS** | Normal, solid, encrypted, wrong pw, MT, fast, store, PQ, integrity |
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| NIST vectors | 13 | **13/13 PASS** | See table above |
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| **Total** | **62** | **62/62 PASS** | |
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## 6. Test Suite Summary — v2.1.7
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| Suite | Tests | v2.1.7 Result | What It Covers |
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|-------|-------|---------------|----------------|
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| NIST/RFC vectors | 13 | **13/13 PASS** | See §1 |
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| VaptVupt unit | 11 | **11/11 PASS** | See §5 |
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| Regression | 22 | **22/22 PASS** | All codecs, modes, encryption, edge cases, corruption detection |
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| Multi-threaded | 14 | **13/14 PASS** ⚠ | N=1/2/4/8, large files, MT+encryption |
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| Post-quantum | 10 | **10/10 PASS** | Keygen, PQ encrypt/decrypt, wrong key, password compat, PQ+MT, 2 MB |
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| **Total** | **70** | **69/70 PASS** | |
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**The single failing case is `Solid+N=8 (3 mismatches)` — see §11 (newly-recorded known limitation).**
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Reproduction: `make test-all`
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---
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## 3. Memory Safety
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## 7. Memory Safety — re-validated on v2.1.7
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| Tool | Command | Result |
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|------|---------|--------|
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| AddressSanitizer | `make test-asan` | **Zero errors** |
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| Tool | Command | v2.1.7 Result |
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|------|---------|---------------|
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| AddressSanitizer (plain) | `./zupt_asan compress` / `extract` | **Zero errors** |
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| AddressSanitizer (encrypted, PBKDF2) | `./zupt_asan compress -p` | **Zero errors** |
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| AddressSanitizer (PQ hybrid) | `./zupt_asan compress --pq` / `extract --pq` | **Zero errors** |
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| AddressSanitizer (multi-threaded N=4) | `./zupt_asan compress -t 4` | **Zero errors** |
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| AddressSanitizer (deduplication) | `./zupt_asan compress --dedup` | **Zero errors** |
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| UndefinedBehaviorSanitizer | Built with `-fsanitize=address,undefined` | **Zero errors** |
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| All code paths tested | Normal + solid + encrypted + PQ + MT | **Clean** |
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Reproduction:
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```bash
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@ -87,94 +103,53 @@ make test-asan
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./zupt_asan compress /tmp/t.zupt /path/to/data/
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./zupt_asan extract -o /tmp/out/ /tmp/t.zupt
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./zupt_asan keygen -o /tmp/k.key
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./zupt_asan keygen --pub -o /tmp/pub.key -k /tmp/k.key
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./zupt_asan compress --pq /tmp/pub.key /tmp/pq.zupt /path/to/data/
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./zupt_asan extract --pq /tmp/k.key -o /tmp/pqout/ /tmp/pq.zupt
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./zupt_asan compress -t 4 /tmp/mt.zupt /path/to/data/
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./zupt_asan compress --dedup /tmp/d.zupt /path/to/data/
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```
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---
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## 4. Compiler Warning Audit
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## 8. Compiler Warning Audit
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| Compiler | Flags | Warnings |
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|----------|-------|----------|
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| GCC 13.x | `-Wall -Wextra -Wpedantic -O2 -std=c11` | **Zero** |
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| Clang 18.x | `-Wall -Wextra -Wpedantic -O2 -std=c11` | **Zero** |
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| Compiler | Flags | v2.1.7 Warnings |
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|----------|-------|-----------------|
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| GCC 13.x | `-Wall -Wextra -O2 -std=c11` | **Zero** |
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| GCC 13.x (pedantic) | `-Wall -Wextra -Wpedantic -O2 -std=c11` | **Zero** |
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---
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## 5. Constant-Time Analysis
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## 9. Constant-Time Analysis — unchanged from v2.0.0
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| Function | Location | CT Method | Jasmin Verified? | Risk Level |
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|----------|----------|-----------|-----------------|------------|
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| HMAC comparison | `zupt_crypto.c:252` | 4×u64 XOR accumulation | **Yes** — `zupt_mac_verify_ct` linked | **None** (Jasmin proven) |
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| ML-KEM FO select | `zupt_mlkem.c:593` | 4×u64 masked select | **Yes** — `zupt_ct_select_32` linked | **None** (Jasmin proven) |
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| HMAC comparison | `zupt_crypto.c` | 4×u64 XOR accumulation | **Yes** — `zupt_mac_verify_ct` linked | **None** (Jasmin proven) |
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| ML-KEM FO select | `zupt_mlkem.c` | 4×u64 masked select | **Yes** — `zupt_ct_select_32` linked | **None** (Jasmin proven) |
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| AES-256 CTR (4-block) | `zupt_aes256.c` (AES-NI dispatch) | Hardware AES-NI + AVX | **Yes** — `zupt_aes256_ctr4` linked | **None** (CT by hardware) |
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| ML-KEM NTT butterfly | `zupt_mlkem.c` | Montgomery reduction (branchless) | No | Low |
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| ML-KEM CBD sampling | `zupt_mlkem.c` | Bitwise operations only | No | Low |
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| X25519 fe_cswap | `zupt_x25519.c:95` | Masked XOR swap | No (limb mismatch) | Low (C is branchless) |
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| X25519 Montgomery ladder | `zupt_x25519.c:243` | Fixed 255 iterations | No | Low |
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| AES-256 encrypt | `zupt_aes256.c:59` | **Table-based S-box** | **No** | **HIGH on shared HW** |
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| X25519 fe_cswap | `zupt_x25519.c` | Masked XOR swap | No (limb mismatch) | Low (C is branchless) |
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| X25519 Montgomery ladder | `zupt_x25519.c` | Fixed 255 iterations | No | Low |
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| AES-256 encrypt (C fallback) | `zupt_aes256.c` | Table-based S-box | No | **HIGH on shared HW without AES-NI** |
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| SHA-256 | `zupt_sha256.c` | Table-based constants | No | Low (not secret-indexed) |
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| Keccak-f[1600] | `zupt_keccak.c` | Bitwise XOR/ROT only | No | None |
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| Key wipe | `zupt_crypto.c` | `explicit_bzero` / volatile | No | Low |
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### Jasmin Assembly Verification
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Two functions confirmed active in binary via `nm`:
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Functions confirmed active in binary via `nm`:
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```
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0000000000014ae0 T zupt_mac_verify_ct ← Jasmin assembly, CT proven
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0000000000014b20 T zupt_ct_select_32 ← Jasmin assembly, CT proven
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T zupt_mac_verify_ct ← Jasmin assembly, CT proven
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T zupt_ct_select_32 ← Jasmin assembly, CT proven
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T zupt_aes256_ctr4 ← Jasmin assembly, CT by hardware
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```
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Assembly generated by `jasminc 2026.03.0`. Constant-time enforced by Jasmin type system: secret-typed variables cannot flow into branch conditions or memory indices.
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### Not Wired (with reason)
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| Function | Issue | Fallback |
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|----------|-------|----------|
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| `zupt_fe_cswap` | Jasmin: 4×u64 limbs, C: 5×u51 — incompatible | C masked XOR (branchless) |
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| `zupt_aes256_blk` | Stack offset bug: `rk.[1]` → `[rsp+1]` not `[rsp+16]` | C table-based AES |
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---
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## 6. Key Material Lifecycle
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| Phase | Method | Verified |
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|-------|--------|----------|
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| Generation | OS CSPRNG: `getrandom(2)` / `/dev/urandom` / `RtlGenRandom` | Hard fail if unavailable |
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| Storage | Stack-local arrays (no heap allocation for keys) | ASAN verified |
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| Usage | Passed by const pointer to AES-CTR / HMAC | No copies to heap |
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| Wipe | `zupt_secure_wipe()`: `explicit_bzero` (glibc 2.25+), `SecureZeroMemory` (Win), volatile fallback | Compiler cannot optimize out |
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| Scope exit | Stack frame destroyed | Keys were on stack |
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All intermediate buffers in PBKDF2, hybrid KEM, ML-KEM encaps/decaps, and X25519 wiped before return.
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---
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## 7. Nonce Security
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**Scheme:** `per_block_nonce = base_nonce XOR pad_le(block_seq, 8)`
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- `base_nonce`: 128-bit random from CSPRNG, generated once per archive.
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- `block_seq`: monotonically increasing 0, 1, 2, ... per archive.
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- **Uniqueness within archive:** Guaranteed (distinct seq → distinct nonce).
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- **Uniqueness across archives:** 2^-128 collision probability per pair (birthday bound on random base).
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---
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## 8. Encrypt-then-MAC Ordering
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| Step | Action | Verified |
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|------|--------|----------|
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| 1 | Compute HMAC over `nonce ‖ ciphertext` | HMAC input is nonce+ct, not plaintext |
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| 2 | Verify HMAC before any decryption | Code path: MAC check → early return if fail → decrypt only on success |
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| 3 | Decrypt only authenticated data | No plaintext produced from unauthenticated ciphertext |
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**Prevents:** Chosen-ciphertext attacks, padding oracles, ciphertext tampering.
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---
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## 9. Bugs Found and Fixed (v0.5.1 → v1.5.0)
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## 10. Bugs Found and Fixed (v0.5.1 → v2.1.7)
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| Bug | Severity | Version Fixed | Impact |
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|-----|----------|---------------|--------|
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@ -187,24 +162,62 @@ All intermediate buffers in PBKDF2, hybrid KEM, ML-KEM encaps/decaps, and X25519
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| ML-KEM `inv_ntt` wrong table | High | v1.0.0 | NTT roundtrip failure |
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| PQ nonce mismatch | High | v1.0.0 | Encrypt/decrypt used different nonces |
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| X25519 `AA + a24*E` formula | High | v1.1.0 | Wrong curve, not interoperable |
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| Dead `match_cost()` | Low | v1.1.0 | Clang warning |
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| `const polyvec` qualifier | Low | v1.1.0 | Pedantic warnings |
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| `__int128` pedantic | Low | v1.1.0 | Pedantic warning |
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| `copy_match_scalar` overlap corruption | High | v2.0.0 | Silent corruption on offset 4–7 (8-byte bulk overlap) |
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| `vva_encode_sequences` heap overflow | High | v2.0.0 | nseq×5+1 sizing insufficient on large literal runs |
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| `SIGILL` on Linux Mint (AES dispatch) | High | v2.0.0 | Jasmin AES uses VEX → needs OSXSAVE+XCR0, not just AES-NI |
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| TOCTOU race in `get_device_size` | High | v2.1.4 | Path swap between `stat` and `open`; CodeQL alert |
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| LZHP prediction encoding desync | High | v2.1.3 | Data corruption on structured data |
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---
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## 10. Known Limitations
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## 11. Known Limitations
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| Limitation | Impact | Mitigation | Status |
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|------------|--------|------------|--------|
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| Table-based AES (C fallback) | Cache-timing on shared hardware | Jasmin AES-NI path exists but has offset bug | **Open** — fix `.jazz` source |
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| **Solid mode + multi-threaded archives over ~3 MB** ⚠ NEW | Decompression error "Solid block N decompression failed" on extract. Reproduces on v2.1.6 and v2.1.7 (not introduced by relicense). Compression succeeds; extraction fails on a specific block. The CLI clamps `--solid` to N=1 with a stderr note; this bug appears in the inner solid-stream framing when the on-disk archive happens to span ≥4 blocks of ~512 KB each. | Use plain `--solid` (without `-t >1`) for solid archives; non-solid MT works correctly. Investigation in progress in `zupt_format.c:1428–1452` (block_seq accounting around encryption-header consumption). | **Open** — pre-existing, not relicense-induced |
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| Table-based AES (C fallback) | Cache-timing on shared hardware | Jasmin AES-NI 4-block pipeline (`zupt_aes256_ctr4`) IS linked and is the default on x86_64+AVX. Single-block Jasmin (`zupt_aes256_blk`) has stack offset bug. | **Partial** — 4-block path covered |
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| Table-based SHA-256 | Theoretical cache-timing | Not used on secret-indexed data | **Accepted** |
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| PBKDF2 not quantum-safe | Quantum password brute-force | Use `--pq` mode | **Documented** |
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| No `mlock()` | Keys swappable to disk | Short key lifetime + `zupt_secure_wipe` | **Planned** |
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| No fuzzing performed | Undiscovered bugs | AFL++ setup in FUZZING.md | **Planned** |
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| No independent audit | Self-assessed only | Open source + Jasmin proofs | **Planned** |
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| X25519 Jasmin not linked | C fallback for fe_cswap | C is branchless but compiler-dependent | **Open** — limb mismatch |
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| No fuzzing performed | Undiscovered bugs | AFL++ harnesses available via `make fuzz-build`; not yet executed in production | **Planned** |
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| No independent audit | Self-assessed only | Open source under AGPL-3.0 + Jasmin formal proofs + commercial support available at sac@securityops.co | **Planned** |
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| X25519 Jasmin not linked | C fallback for `fe_cswap` | C is branchless but compiler-dependent. Limb mismatch (Jasmin: 4×u64, C: 5×u51) is the blocker. | **Open** |
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---
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© 2026 Cristian Cezar Moisés — MIT License
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## 12. v2.1.7 Relicense + VaptVupt Upgrade — Audit Implications
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The v2.1.7 release does two distinct things, both of which were validated separately:
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**(A) Relicense from MIT to AGPL-3.0-or-later (Zupt core only).** VaptVupt was already GPL-3.0-or-later in upstream and remains so. The relicense touches only license metadata (SPDX headers, copyright lines, `LICENSE` files, `--help` strings, README badges, packaging metadata). **No cryptographic, compression, threading, encryption, or control-flow code was modified by the relicense itself.**
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**(B) Upgrade VaptVupt 2.40.0 → 2.46.1.** The 12 VaptVupt files (`src/vv_*.c`, `src/vaptvupt_api.c`, `include/vaptvupt*.h`, `include/vv_*.h`) were replaced from upstream master at `github.com/cristiancmoises/vaptvupt`. Public API and `vv_options_t` are byte-identical; no caller changes required. Most relevantly, **v2.46.1 includes a memory-safety fix** for a 16,384-byte leak on three decoder error paths in `vva_decode_sequences_impl` — closing a denial-of-service vector where many malformed compressed frames could exhaust memory.
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Audit results on the upgraded + relicensed tree:
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- **All NIST/RFC test vectors continue to pass on v2.1.7.**
|
||||
- **All ASAN/UBSAN sweeps continue to be clean on v2.1.7.**
|
||||
- **The single MT failing case (`Solid+N=8`) is verified pre-existing on v2.1.6** by stashing v2.1.7 changes, rebuilding the v2.1.6 tree, and reproducing the same failure on the same fixture — it is independent of both the relicense and the codec upgrade.
|
||||
|
||||
The relicense formally establishes a commercial-licensing channel at **sac@securityops.co** for users whose use case is incompatible with AGPL's source-disclosure obligations.
|
||||
|
||||
---
|
||||
|
||||
## 13. Reproduction
|
||||
|
||||
```bash
|
||||
# Full validation
|
||||
make clean && make
|
||||
make test-all # NIST vectors + VV unit + regression + threaded + PQ
|
||||
make test-asan # AddressSanitizer build
|
||||
# (run ASAN sweep manually per §7)
|
||||
|
||||
# Spot-check the relicense
|
||||
./zupt --version # should print: zupt 2.1.7
|
||||
./zupt 2>&1 | grep -i lic # should print: License: AGPL-3.0-or-later (commercial: sac@securityops.co)
|
||||
grep -c "SPDX-License-Identifier" src/*.c src/*.h include/*.h tests/*.c
|
||||
# (should be > 30, all sources covered)
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
© 2026 Cristian Cezar Moisés — AGPL-3.0-or-later
|
||||
Commercial licensing: sac@securityops.co
|
||||
|
|
|
|||
Loading…
Reference in a new issue