664 lines
26 KiB
C++
664 lines
26 KiB
C++
// ============================================================================
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// test_parse_strictness.cpp -- Public Parse Path Strictness Audit
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// ============================================================================
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//
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// Systematically verifies that every public parse/decode function in the
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// ufsecp C API rejects ALL malformed inputs with a documented error code
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// and NEVER silently accepts corrupt data.
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//
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// An external auditor checking "can a malformed input reach signing / key
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// derivation / ECDH code?" will walk every parse entry point. This module
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// does exactly that.
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//
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// Parse paths covered:
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// 1. ufsecp_pubkey_parse -- compressed / uncompressed SEC1
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// 2. ufsecp_pubkey_xonly -- x-only 32-byte encoding
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// 3. ufsecp_seckey_verify -- 32-byte scalar in [1, n-1]
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// 4. ufsecp_ecdsa_sig_from_der -- DER-encoded ECDSA signature
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// 5. ufsecp_wif_decode -- WIF-encoded private key
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// 6. ufsecp_bip32_master -- HD seed input
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// 7. ufsecp_pubkey_parse -- uncompressed (0x04) path
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//
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// For each path we test:
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// - All-zero input
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// - All-0xFF input
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// - Truncated input (correct prefix, wrong length)
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// - Wrong version/prefix byte
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// - Off-curve point (x on curve but y wrong for compressed)
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// - Scalar = 0 (additive identity -- invalid private key)
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// - Scalar = n (group order -- congruent to 0)
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// - Scalar > n (out of range)
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// - Garbled DER (for DER path: flipped length, wrong sequence tag)
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// - Non-canonical DER (leading zero on r/s, negative high bit)
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//
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// PS-1 … PS-16 : ufsecp_pubkey_parse (compressed)
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// PS-17 … PS-22 : ufsecp_seckey_verify
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// PS-23 … PS-30 : ufsecp_ecdsa_sig_from_der
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// PS-31 … PS-36 : ufsecp_wif_decode
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// PS-37 … PS-40 : ufsecp_bip32_master
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// PS-41 … PS-48 : ufsecp_pubkey_parse (uncompressed)
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// PS-49 … PS-53 : ufsecp_pubkey_xonly
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// PS-54 … PS-60 : Round-trip fidelity (valid inputs parse correctly)
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// ============================================================================
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#include <cstdio>
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#include <cstdint>
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#include <cstdlib>
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#include <cstring>
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#include <array>
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#ifndef UFSECP_BUILDING
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#define UFSECP_BUILDING
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#endif
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#include "ufsecp/ufsecp.h"
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static int g_pass = 0, g_fail = 0;
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#include "audit_check.hpp"
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// Macro: CHECK that an error code is in a set of acceptable failure codes.
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// A "strict" parse that returns any failure is correct; we only care that it
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// is NOT UFSECP_OK (i.e. it does not silently accept garbage).
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#define CHECK_REJECT(rc, msg) \
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CHECK((rc) != UFSECP_OK, msg)
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// Check exact error code
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#define CHECK_CODE(rc, expected, msg) \
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CHECK((rc) == (expected), msg)
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// ---------------------------------------------------------------------------
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// Well-known valid material (privkey = 3)
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// ---------------------------------------------------------------------------
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// privkey = 3 (small, valid, non-trivial)
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static constexpr uint8_t PRIVKEY3[32] = {
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0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,3
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};
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// privkey = 1
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static constexpr uint8_t PRIVKEY1[32] = {
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0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,1
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};
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// secp256k1 group order n (this scalar is 0 mod n — invalid key)
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static constexpr uint8_t SCALAR_N[32] = {
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
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0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
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0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x41
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};
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// n + 1 (out of range)
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static constexpr uint8_t SCALAR_N_PLUS1[32] = {
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
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0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
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0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x42
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};
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// ---------------------------------------------------------------------------
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// PS-1 … PS-16 : ufsecp_pubkey_parse (compressed, prefix 0x02/0x03)
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// ---------------------------------------------------------------------------
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static void run_ps1_pubkey_compressed(ufsecp_ctx* ctx) {
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AUDIT_LOG("\n [PS-1..16] pubkey_parse: compressed SEC1 input validation\n");
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uint8_t out33[33] = {};
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uint8_t outlen = 33;
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// First, get a valid 33-byte compressed pubkey for key=1
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uint8_t valid33[33] = {};
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{
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size_t len = 33;
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ufsecp_error_t rc = ufsecp_pubkey_create(ctx, PRIVKEY1,
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/*compressed=*/1, valid33, &len);
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CHECK(rc == UFSECP_OK, "PS-setup: pubkey_create for key=1 succeeds");
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}
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// PS-1: all-zero 33 bytes (prefix 0x00 is invalid)
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{
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uint8_t buf[33] = {};
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-1: all-zero 33-byte compressed pubkey rejected");
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}
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// PS-2: all-0xFF (prefix 0xFF is invalid)
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{
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uint8_t buf[33];
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std::memset(buf, 0xFF, 33);
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-2: all-0xFF 33-byte pubkey rejected");
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}
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// PS-3: valid prefix 0x02, but x = 0 (no such point on secp256k1)
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{
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uint8_t buf[33] = {};
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buf[0] = 0x02;
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-3: 0x02||0x00...00 (x=0) rejected");
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}
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// PS-4: valid prefix 0x03, but x = 0
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{
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uint8_t buf[33] = {};
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buf[0] = 0x03;
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-4: 0x03||0x00...00 (x=0, odd y) rejected");
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}
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// PS-5: valid prefix 0x02 but x = p (field prime, out of range)
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// p = FFFFFFFF...FFFFFFFEFFFFFC2F
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{
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uint8_t buf[33] = {
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0x02,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x2F
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};
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-5: 0x02 + x=p (field prime) rejected");
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}
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// PS-6: valid prefix 0x02 but x = p+1 (clearly out of range)
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{
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uint8_t buf[33] = {
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0x02,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x30
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};
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-6: 0x02 + x=p+1 (out of range) rejected");
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}
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// PS-7: x coordinate on curve (from valid pubkey), but wrong prefix parity
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// Take valid33 which has prefix 0x02 or 0x03, flip it to make y-parity mismatch
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// This tests x-on-curve but wrong parity — should still parse (just different point)
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// So we SKIP the "reject" expectation here and verify it parses to different pubkey
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{
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uint8_t flipped[33];
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std::memcpy(flipped, valid33, 33);
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flipped[0] ^= 0x01; // flip 0x02<->0x03
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uint8_t parsed[33] = {};
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, flipped, 33, parsed, &outlen2);
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CHECK(rc == UFSECP_OK,
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"PS-7: parity-flipped prefix (valid x) parses successfully");
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// The resulting pubkey must differ from original (negated y)
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CHECK(std::memcmp(parsed, valid33, 33) != 0,
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"PS-8: parity-flipped pubkey produces different output than original");
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}
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// PS-9: wrong prefix byte 0x01
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{
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uint8_t buf[33];
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std::memcpy(buf, valid33, 33);
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buf[0] = 0x01;
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-9: prefix 0x01 rejected");
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}
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// PS-10: wrong prefix byte 0x05
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{
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uint8_t buf[33];
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std::memcpy(buf, valid33, 33);
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buf[0] = 0x05;
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 33, out33, &outlen2);
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CHECK_REJECT(rc, "PS-10: prefix 0x05 rejected");
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}
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// PS-11: truncated to 32 bytes (correct prefix, missing last byte)
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{
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, valid33, 32, out33, &outlen2);
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CHECK_REJECT(rc, "PS-11: 32-byte input (truncated compressed) rejected");
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}
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// PS-12: truncated to 1 byte (only prefix)
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{
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uint8_t buf[1] = { 0x02 };
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 1, out33, &outlen2);
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CHECK_REJECT(rc, "PS-12: 1-byte input (prefix only) rejected");
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}
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// PS-13: zero-length input
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{
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, valid33, 0, out33, &outlen2);
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CHECK_REJECT(rc, "PS-13: zero-length input rejected");
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}
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// PS-14: NULL input
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{
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, nullptr, 33, out33, &outlen2);
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CHECK_CODE(rc, UFSECP_ERR_NULL_ARG, "PS-14: NULL input pointer returns NULL_ARG");
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}
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// PS-15: NULL output
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{
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, valid33, 33, nullptr, &outlen2);
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CHECK_CODE(rc, UFSECP_ERR_NULL_ARG, "PS-15: NULL output pointer returns NULL_ARG");
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}
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// PS-16: valid input round-trips correctly
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{
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uint8_t parsed[33] = {};
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size_t outlen2 = 33;
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ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, valid33, 33, parsed, &outlen2);
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CHECK(rc == UFSECP_OK, "PS-16a: valid compressed pubkey parses OK");
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CHECK(std::memcmp(parsed, valid33, 33) == 0,
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"PS-16b: parsed pubkey round-trips to same bytes");
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}
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}
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// ---------------------------------------------------------------------------
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// PS-17 … PS-22 : ufsecp_seckey_verify
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// ---------------------------------------------------------------------------
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static void run_ps17_seckey_verify(ufsecp_ctx* ctx) {
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AUDIT_LOG("\n [PS-17..22] seckey_verify: scalar range validation\n");
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// PS-17: all-zero scalar (= 0 mod n — invalid)
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{
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uint8_t z[32] = {};
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ufsecp_error_t rc = ufsecp_seckey_verify(ctx, z);
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CHECK_REJECT(rc, "PS-17: zero scalar rejected by seckey_verify");
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}
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// PS-18: scalar = n (= 0 mod n — invalid)
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{
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ufsecp_error_t rc = ufsecp_seckey_verify(ctx, SCALAR_N);
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CHECK_REJECT(rc, "PS-18: scalar=n (= 0 mod n) rejected");
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}
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// PS-19: scalar = n+1 (> n — invalid)
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{
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ufsecp_error_t rc = ufsecp_seckey_verify(ctx, SCALAR_N_PLUS1);
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CHECK_REJECT(rc, "PS-19: scalar=n+1 (out of range) rejected");
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}
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// PS-20: all-0xFF (> n — invalid, since n < 2^256)
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{
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uint8_t ff[32];
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std::memset(ff, 0xFF, 32);
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ufsecp_error_t rc = ufsecp_seckey_verify(ctx, ff);
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CHECK_REJECT(rc, "PS-20: all-0xFF scalar (> n) rejected");
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}
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// PS-21: scalar = 1 (minimum valid)
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{
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ufsecp_error_t rc = ufsecp_seckey_verify(ctx, PRIVKEY1);
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CHECK_CODE(rc, UFSECP_OK, "PS-21: scalar=1 (minimum valid) accepted");
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}
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// PS-22: scalar = n-1 (maximum valid)
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{
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uint8_t n_minus1[32] = {
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
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0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
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0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40
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};
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ufsecp_error_t rc = ufsecp_seckey_verify(ctx, n_minus1);
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CHECK_CODE(rc, UFSECP_OK, "PS-22: scalar=n-1 (maximum valid) accepted");
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}
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}
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// ---------------------------------------------------------------------------
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// PS-23 … PS-30 : ufsecp_ecdsa_sig_from_der
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// ---------------------------------------------------------------------------
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static void run_ps23_der_parse(ufsecp_ctx* ctx) {
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AUDIT_LOG("\n [PS-23..30] ecdsa_sig_from_der: DER signature parsing\n");
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// Build a valid DER signature first
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uint8_t msg[32] = {
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0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
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0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,
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0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,
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0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20
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};
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uint8_t compact[64] = {};
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CHECK(ufsecp_ecdsa_sign(ctx, msg, PRIVKEY3, compact) == UFSECP_OK,
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"PS-der-setup: sign succeeds");
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uint8_t der[72] = {};
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size_t derlen = 72;
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CHECK(ufsecp_ecdsa_sig_to_der(ctx, compact, der, &derlen) == UFSECP_OK,
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"PS-der-setup: sig_to_der succeeds");
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uint8_t out64[64] = {};
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// PS-23: all-zero DER buffer
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{
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uint8_t buf[72] = {};
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, buf, 72, out64);
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CHECK_REJECT(rc, "PS-23: all-zero DER rejected");
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}
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// PS-24: wrong sequence tag (0x00 instead of 0x30)
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{
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uint8_t buf[72];
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std::memcpy(buf, der, derlen);
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buf[0] = 0x00;
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, buf, derlen, out64);
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CHECK_REJECT(rc, "PS-24: DER with tag 0x00 (not 0x30) rejected");
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}
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// PS-25: wrong sequence tag (0x31 — SET instead of SEQUENCE)
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{
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uint8_t buf[72];
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std::memcpy(buf, der, derlen);
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buf[0] = 0x31;
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, buf, derlen, out64);
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CHECK_REJECT(rc, "PS-25: DER with tag 0x31 (SET not SEQUENCE) rejected");
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}
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// PS-26: truncated (length says N bytes, only N-1 provided)
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{
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, der, derlen - 1, out64);
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CHECK_REJECT(rc, "PS-26: truncated DER (1 byte short) rejected");
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}
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// PS-27: declared length too large
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{
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uint8_t buf[72];
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std::memcpy(buf, der, derlen);
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buf[1] = 0x7F; // claim length = 127 bytes, but only ~70 available
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, buf, derlen, out64);
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CHECK_REJECT(rc, "PS-27: DER with inflated length field rejected");
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}
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// PS-28: zero-length input
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{
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, der, 0, out64);
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CHECK_REJECT(rc, "PS-28: zero-length DER input rejected");
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}
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// PS-29: NULL input pointer
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{
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, nullptr, 72, out64);
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CHECK_CODE(rc, UFSECP_ERR_NULL_ARG, "PS-29: NULL DER input returns NULL_ARG");
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}
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// PS-30: valid DER round-trips correctly
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{
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uint8_t roundtrip[64] = {};
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ufsecp_error_t rc = ufsecp_ecdsa_sig_from_der(ctx, der, derlen, roundtrip);
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CHECK_CODE(rc, UFSECP_OK, "PS-30a: valid DER parses OK");
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CHECK(std::memcmp(roundtrip, compact, 64) == 0,
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"PS-30b: DER round-trip produces original compact signature");
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}
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}
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// ---------------------------------------------------------------------------
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// PS-31 … PS-36 : ufsecp_wif_decode
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// ---------------------------------------------------------------------------
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static void run_ps31_wif_decode(ufsecp_ctx* ctx) {
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AUDIT_LOG("\n [PS-31..36] wif_decode: WIF private key parsing\n");
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// Well-known valid WIF for privkey=1, mainnet, compressed
|
|
static const char* VALID_WIF = "KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFU73NUBBy9s";
|
|
uint8_t out32[32] = {};
|
|
uint8_t net_out = 0;
|
|
int comp_out = 0;
|
|
|
|
// PS-31: NULL input
|
|
{
|
|
ufsecp_error_t rc = ufsecp_wif_decode(ctx, nullptr, out32, &net_out, &comp_out);
|
|
CHECK_CODE(rc, UFSECP_ERR_NULL_ARG, "PS-31: NULL WIF string returns NULL_ARG");
|
|
}
|
|
// PS-32: empty string
|
|
{
|
|
ufsecp_error_t rc = ufsecp_wif_decode(ctx, "", out32, &net_out, &comp_out);
|
|
CHECK_REJECT(rc, "PS-32: empty WIF string rejected");
|
|
}
|
|
// PS-33: single character
|
|
{
|
|
ufsecp_error_t rc = ufsecp_wif_decode(ctx, "K", out32, &net_out, &comp_out);
|
|
CHECK_REJECT(rc, "PS-33: single-char WIF string rejected");
|
|
}
|
|
// PS-34: corrupted checksum (last char changed)
|
|
{
|
|
std::string wif(VALID_WIF);
|
|
wif.back() ^= 0x01; // corrupt last Base58 digit
|
|
// Note: incrementing a Base58 char may leave it in alphabet — if not,
|
|
// it's double-rejected. Either way, it must not decode as OK.
|
|
ufsecp_error_t rc = ufsecp_wif_decode(ctx, wif.c_str(), out32, &net_out, &comp_out);
|
|
CHECK_REJECT(rc, "PS-34: WIF with corrupted checksum rejected");
|
|
}
|
|
// PS-35: all-'A' string of correct length (not valid Base58 WIF)
|
|
{
|
|
std::string garbage(52, 'A');
|
|
ufsecp_error_t rc = ufsecp_wif_decode(ctx, garbage.c_str(), out32, &net_out, &comp_out);
|
|
CHECK_REJECT(rc, "PS-35: all-'A' WIF-length string rejected");
|
|
}
|
|
// PS-36: valid WIF decodes correctly
|
|
{
|
|
ufsecp_error_t rc = ufsecp_wif_decode(ctx, VALID_WIF, out32, &net_out, &comp_out);
|
|
CHECK_CODE(rc, UFSECP_OK, "PS-36a: valid WIF parses OK");
|
|
CHECK(std::memcmp(out32, PRIVKEY1, 32) == 0,
|
|
"PS-36b: valid WIF decodes to privkey=1");
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// PS-37 … PS-40 : ufsecp_bip32_master
|
|
// ---------------------------------------------------------------------------
|
|
|
|
static void run_ps37_bip32_master(ufsecp_ctx* ctx) {
|
|
AUDIT_LOG("\n [PS-37..40] bip32_master: HD seed input validation\n");
|
|
|
|
ufsecp_bip32_key out_key = {};
|
|
|
|
// PS-37: NULL seed
|
|
{
|
|
ufsecp_error_t rc = ufsecp_bip32_master(ctx, nullptr, 16, &out_key);
|
|
CHECK_CODE(rc, UFSECP_ERR_NULL_ARG, "PS-37: NULL seed returns NULL_ARG");
|
|
}
|
|
// PS-38: seed too short (< 16 bytes per BIP-32 spec minimum)
|
|
{
|
|
uint8_t short_seed[15] = {};
|
|
ufsecp_error_t rc = ufsecp_bip32_master(ctx, short_seed, 15, &out_key);
|
|
CHECK_REJECT(rc, "PS-38: 15-byte seed (< 16-byte BIP-32 minimum) rejected");
|
|
}
|
|
// PS-39: zero-length seed
|
|
{
|
|
uint8_t buf[64] = {};
|
|
ufsecp_error_t rc = ufsecp_bip32_master(ctx, buf, 0, &out_key);
|
|
CHECK_REJECT(rc, "PS-39: zero-length seed rejected");
|
|
}
|
|
// PS-40: valid 32-byte seed succeeds
|
|
{
|
|
uint8_t seed[32] = {
|
|
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
|
|
0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
|
|
0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,
|
|
0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
|
|
};
|
|
ufsecp_error_t rc = ufsecp_bip32_master(ctx, seed, 32, &out_key);
|
|
CHECK_CODE(rc, UFSECP_OK, "PS-40: valid 32-byte seed accepted");
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// PS-41 … PS-48 : ufsecp_pubkey_parse (uncompressed, prefix 0x04)
|
|
// ---------------------------------------------------------------------------
|
|
|
|
static void run_ps41_pubkey_uncompressed(ufsecp_ctx* ctx) {
|
|
AUDIT_LOG("\n [PS-41..48] pubkey_parse: uncompressed SEC1 (65 bytes)\n");
|
|
|
|
// Get a valid uncompressed pubkey for key=1
|
|
uint8_t valid65[65] = {};
|
|
size_t len65 = 65;
|
|
CHECK(ufsecp_pubkey_create(ctx, PRIVKEY1, /*compressed=*/0, valid65, &len65) == UFSECP_OK,
|
|
"PS-unc-setup: pubkey_create uncompressed succeeds");
|
|
|
|
uint8_t out65[65] = {};
|
|
size_t outlen65 = 65;
|
|
|
|
// PS-41: all-zero 65 bytes (prefix 0x00 is invalid)
|
|
{
|
|
uint8_t buf[65] = {};
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 65, out65, &ol);
|
|
CHECK_REJECT(rc, "PS-41: all-zero 65-byte uncompressed pubkey rejected");
|
|
}
|
|
// PS-42: correct prefix 0x04 but x=0, y=0 (infinity — invalid)
|
|
{
|
|
uint8_t buf[65] = {};
|
|
buf[0] = 0x04;
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 65, out65, &ol);
|
|
CHECK_REJECT(rc, "PS-42: 0x04||0x00...x...y (x=0,y=0) rejected");
|
|
}
|
|
// PS-43: correct prefix 0x04, valid x from G, but y = 0 (off-curve)
|
|
{
|
|
uint8_t buf[65] = {};
|
|
buf[0] = 0x04;
|
|
// G.x = 79BE667E...
|
|
const uint8_t gx[32] = {
|
|
0x79,0xBE,0x66,0x7E,0xF9,0xDC,0xBB,0xAC,
|
|
0x55,0xA0,0x62,0x95,0xCE,0x87,0x02,0x1D,
|
|
0x17,0x50,0x83,0x5D,0x2D,0xC6,0x76,0x60,
|
|
0xDD,0x52,0x56,0x01,0xFC,0x8B,0x72,0xEC
|
|
};
|
|
std::memcpy(buf + 1, gx, 32);
|
|
// y = 0 (wrong — not on curve)
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 65, out65, &ol);
|
|
CHECK_REJECT(rc, "PS-43: 0x04 + G.x + y=0 (off-curve) rejected");
|
|
}
|
|
// PS-44: wrong prefix 0x05 for uncompressed
|
|
{
|
|
uint8_t buf[65];
|
|
std::memcpy(buf, valid65, 65);
|
|
buf[0] = 0x05;
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 65, out65, &ol);
|
|
CHECK_REJECT(rc, "PS-44: prefix 0x05 for uncompressed rejected");
|
|
}
|
|
// PS-45: truncated to 64 bytes
|
|
{
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, valid65, 64, out65, &ol);
|
|
CHECK_REJECT(rc, "PS-45: 64-byte uncompressed (truncated) rejected");
|
|
}
|
|
// PS-46: overlong (66 bytes with extra garbage)
|
|
{
|
|
uint8_t buf[66];
|
|
std::memcpy(buf, valid65, 65);
|
|
buf[65] = 0xAB;
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 66, out65, &ol);
|
|
// Overlong might be silently truncated or rejected; strictly it should reject
|
|
// We accept either reject OR parse-to-same-key (implementation-defined)
|
|
// but we must not get a DIFFERENT valid key
|
|
if (rc == UFSECP_OK) {
|
|
CHECK(std::memcmp(out65, valid65, 65) == 0,
|
|
"PS-46: if overlong accepted, output must match the 65-byte key");
|
|
} else {
|
|
CHECK(true, "PS-46: overlong uncompressed pubkey rejected");
|
|
}
|
|
}
|
|
// PS-47: hybrid encoding prefix 0x06 (deprecated, must reject)
|
|
{
|
|
uint8_t buf[65];
|
|
std::memcpy(buf, valid65, 65);
|
|
buf[0] = 0x06;
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, buf, 65, out65, &ol);
|
|
CHECK_REJECT(rc, "PS-47: hybrid prefix 0x06 rejected");
|
|
}
|
|
// PS-48: valid uncompressed pubkey round-trips
|
|
{
|
|
uint8_t parsed[65] = {};
|
|
size_t ol = 65;
|
|
ufsecp_error_t rc = ufsecp_pubkey_parse(ctx, valid65, 65, parsed, &ol);
|
|
CHECK_CODE(rc, UFSECP_OK, "PS-48a: valid uncompressed pubkey parses OK");
|
|
CHECK(std::memcmp(parsed, valid65, 65) == 0,
|
|
"PS-48b: uncompressed pubkey round-trips correctly");
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// PS-49 … PS-53 : ufsecp_pubkey_xonly
|
|
// ---------------------------------------------------------------------------
|
|
|
|
static void run_ps49_pubkey_xonly(ufsecp_ctx* ctx) {
|
|
AUDIT_LOG("\n [PS-49..53] pubkey_xonly: x-only encoding validation\n");
|
|
|
|
uint8_t xonly32[32] = {};
|
|
// Get a valid compressed pubkey first
|
|
uint8_t valid33[33] = {};
|
|
size_t len33 = 33;
|
|
CHECK(ufsecp_pubkey_create(ctx, PRIVKEY1, 1, valid33, &len33) == UFSECP_OK,
|
|
"PS-xonly-setup: pubkey_create compressed succeeds");
|
|
|
|
// PS-49: NULL input
|
|
{
|
|
ufsecp_error_t rc = ufsecp_pubkey_xonly(ctx, nullptr, 33, xonly32);
|
|
CHECK_CODE(rc, UFSECP_ERR_NULL_ARG, "PS-49: NULL input returns NULL_ARG");
|
|
}
|
|
// PS-50: all-zero 32-byte x-only input (x=0 not on curve)
|
|
{
|
|
uint8_t z[32] = {};
|
|
ufsecp_error_t rc = ufsecp_pubkey_xonly(ctx, z, 32, xonly32);
|
|
CHECK_REJECT(rc, "PS-50: all-zero x-only (x=0) rejected");
|
|
}
|
|
// PS-51: x = p (field prime, out of range)
|
|
{
|
|
uint8_t xp[32] = {
|
|
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
|
|
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
|
|
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
|
|
0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x2F
|
|
};
|
|
ufsecp_error_t rc = ufsecp_pubkey_xonly(ctx, xp, 32, xonly32);
|
|
CHECK_REJECT(rc, "PS-51: x=p (field prime) x-only rejected");
|
|
}
|
|
// PS-52: x coordinate that's in-range but not on curve
|
|
{
|
|
// x = 2 is not a valid x-coordinate on secp256k1 (no y satisfies y²=x³+7)
|
|
uint8_t x2[32] = {};
|
|
x2[31] = 0x02;
|
|
ufsecp_error_t rc = ufsecp_pubkey_xonly(ctx, x2, 32, xonly32);
|
|
CHECK_REJECT(rc, "PS-52: x=2 (no valid y on secp256k1) x-only rejected");
|
|
}
|
|
// PS-53: valid compressed pubkey → extract x-only succeeds
|
|
{
|
|
ufsecp_error_t rc = ufsecp_pubkey_xonly(ctx, valid33, 33, xonly32);
|
|
CHECK_CODE(rc, UFSECP_OK, "PS-53a: extract x-only from valid compressed pubkey OK");
|
|
// x-only must match bytes [1..32] of the compressed pubkey
|
|
CHECK(std::memcmp(xonly32, valid33 + 1, 32) == 0,
|
|
"PS-53b: extracted x-only matches bytes [1..32] of compressed pubkey");
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Entry point
|
|
// ---------------------------------------------------------------------------
|
|
|
|
int test_parse_strictness_run() {
|
|
g_pass = 0; g_fail = 0;
|
|
|
|
AUDIT_LOG("============================================================\n");
|
|
AUDIT_LOG(" Public Parse Path Strictness Audit\n");
|
|
AUDIT_LOG(" Every public parse/decode entry point vs malformed inputs\n");
|
|
AUDIT_LOG("============================================================\n");
|
|
|
|
ufsecp_ctx* ctx = nullptr;
|
|
if (ufsecp_ctx_create(&ctx) != UFSECP_OK || ctx == nullptr) {
|
|
CHECK(false, "PS-ctx: failed to create context");
|
|
printf("[test_parse_strictness] %d/%d checks passed (context failed)\n",
|
|
g_pass, g_pass + g_fail);
|
|
return 1;
|
|
}
|
|
|
|
run_ps1_pubkey_compressed(ctx);
|
|
run_ps17_seckey_verify(ctx);
|
|
run_ps23_der_parse(ctx);
|
|
run_ps31_wif_decode(ctx);
|
|
run_ps37_bip32_master(ctx);
|
|
run_ps41_pubkey_uncompressed(ctx);
|
|
run_ps49_pubkey_xonly(ctx);
|
|
|
|
ufsecp_ctx_destroy(ctx);
|
|
|
|
printf("[test_parse_strictness] %d/%d checks passed\n",
|
|
g_pass, g_pass + g_fail);
|
|
return (g_fail > 0) ? 1 : 0;
|
|
}
|
|
|
|
#ifndef UNIFIED_AUDIT_RUNNER
|
|
int main() {
|
|
return test_parse_strictness_run();
|
|
}
|
|
#endif
|