doc: check clang format

src/Makefile.test.include

@@ -230,6 +230,7 @@ test_fuzz_fuzz_SOURCES = \
  test/fuzz/crypto_chacha20.cpp \
  test/fuzz/crypto_chacha20_poly1305_aead.cpp \
  test/fuzz/crypto_common.cpp \
+ test/fuzz/crypto_diff_fuzz_poly1305.cpp \
  test/fuzz/crypto_hkdf_hmac_sha256_l32.cpp \
  test/fuzz/crypto_poly1305.cpp \
  test/fuzz/cuckoocache.cpp \

src/test/fuzz/crypto_diff_fuzz_poly1305.cpp

@@ -0,0 +1,211 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+// Reference implementation is based on the public domain implementaion by Andrew Moon
+// poly1305-donna-unrolled.c from https://github.com/floodyberry/poly1305-donna
+
+#include <crypto/poly1305.h>
+#include <cstdint>
+#include <stdint.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+#include <vector>
+
+#define INLINE inline
+#define mul32x32_64(a, b) ((uint64_t)(a) * (b))
+
+static INLINE uint32_t fU8TO32_LE_FAST(const uint8_t* p) { return *(const uint32_t*)p; }
+static INLINE void fU32TO8_LE_FAST(uint8_t* p, const uint32_t v) { *(uint32_t*)p = v; }
+
+#define U8TO32_LE(p) fU8TO32_LE_FAST(p)
+#define U32TO8_LE(p, v) fU32TO8_LE_FAST(p, v)
+
+/*
+Same function name in both bitcoin core implementation and floodyberry's implementation
+So changing the function name "poly1305_auth" to "poly1305_auth_floodyberry" in reference implementation
+*/
+void poly1305_auth_floodyberry(unsigned char out[16], const unsigned char* m, size_t inlen, const unsigned char key[32])
+{
+    uint32_t t0, t1, t2, t3;
+    uint32_t h0, h1, h2, h3, h4;
+    uint32_t r0, r1, r2, r3, r4;
+    uint32_t s1, s2, s3, s4;
+    uint32_t b, nb;
+    size_t j;
+    uint64_t t[5];
+    uint64_t f0, f1, f2, f3;
+    uint32_t g0, g1, g2, g3, g4;
+    uint64_t c;
+    unsigned char mp[16];
+
+    /* clamp key */
+    t0 = U8TO32_LE(key + 0);
+    t1 = U8TO32_LE(key + 4);
+    t2 = U8TO32_LE(key + 8);
+    t3 = U8TO32_LE(key + 12);
+
+    /* precompute multipliers */
+    r0 = t0 & 0x3ffffff;
+    t0 >>= 26;
+    t0 |= t1 << 6;
+    r1 = t0 & 0x3ffff03;
+    t1 >>= 20;
+    t1 |= t2 << 12;
+    r2 = t1 & 0x3ffc0ff;
+    t2 >>= 14;
+    t2 |= t3 << 18;
+    r3 = t2 & 0x3f03fff;
+    t3 >>= 8;
+    r4 = t3 & 0x00fffff;
+
+    s1 = r1 * 5;
+    s2 = r2 * 5;
+    s3 = r3 * 5;
+    s4 = r4 * 5;
+
+    /* init state */
+    h0 = 0;
+    h1 = 0;
+    h2 = 0;
+    h3 = 0;
+    h4 = 0;
+
+    /* full blocks */
+    if (inlen < 16) goto poly1305_donna_atmost15bytes;
+poly1305_donna_16bytes:
+    m += 16;
+    inlen -= 16;
+
+    t0 = U8TO32_LE(m - 16);
+    t1 = U8TO32_LE(m - 12);
+    t2 = U8TO32_LE(m - 8);
+    t3 = U8TO32_LE(m - 4);
+
+    h0 += t0 & 0x3ffffff;
+    h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
+    h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
+    h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
+    h4 += (t3 >> 8) | (1 << 24);
+
+poly1305_donna_mul:
+    t[0] = mul32x32_64(h0, r0) + mul32x32_64(h1, s4) + mul32x32_64(h2, s3) + mul32x32_64(h3, s2) + mul32x32_64(h4, s1);
+    t[1] = mul32x32_64(h0, r1) + mul32x32_64(h1, r0) + mul32x32_64(h2, s4) + mul32x32_64(h3, s3) + mul32x32_64(h4, s2);
+    t[2] = mul32x32_64(h0, r2) + mul32x32_64(h1, r1) + mul32x32_64(h2, r0) + mul32x32_64(h3, s4) + mul32x32_64(h4, s3);
+    t[3] = mul32x32_64(h0, r3) + mul32x32_64(h1, r2) + mul32x32_64(h2, r1) + mul32x32_64(h3, r0) + mul32x32_64(h4, s4);
+    t[4] = mul32x32_64(h0, r4) + mul32x32_64(h1, r3) + mul32x32_64(h2, r2) + mul32x32_64(h3, r1) + mul32x32_64(h4, r0);
+
+    h0 = (uint32_t)t[0] & 0x3ffffff;
+    c = (t[0] >> 26);
+    t[1] += c;
+    h1 = (uint32_t)t[1] & 0x3ffffff;
+    b = (uint32_t)(t[1] >> 26);
+    t[2] += b;
+    h2 = (uint32_t)t[2] & 0x3ffffff;
+    b = (uint32_t)(t[2] >> 26);
+    t[3] += b;
+    h3 = (uint32_t)t[3] & 0x3ffffff;
+    b = (uint32_t)(t[3] >> 26);
+    t[4] += b;
+    h4 = (uint32_t)t[4] & 0x3ffffff;
+    b = (uint32_t)(t[4] >> 26);
+    h0 += b * 5;
+
+    if (inlen >= 16) goto poly1305_donna_16bytes;
+
+    /* final bytes */
+poly1305_donna_atmost15bytes:
+    if (!inlen) goto poly1305_donna_finish;
+
+    for (j = 0; j < inlen; j++)
+        mp[j] = m[j];
+    mp[j++] = 1;
+    for (; j < 16; j++)
+        mp[j] = 0;
+    inlen = 0;
+
+    t0 = U8TO32_LE(mp + 0);
+    t1 = U8TO32_LE(mp + 4);
+    t2 = U8TO32_LE(mp + 8);
+    t3 = U8TO32_LE(mp + 12);
+
+    h0 += t0 & 0x3ffffff;
+    h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
+    h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
+    h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
+    h4 += (t3 >> 8);
+
+    goto poly1305_donna_mul;
+
+poly1305_donna_finish:
+    b = h0 >> 26;
+    h0 = h0 & 0x3ffffff;
+    h1 += b;
+    b = h1 >> 26;
+    h1 = h1 & 0x3ffffff;
+    h2 += b;
+    b = h2 >> 26;
+    h2 = h2 & 0x3ffffff;
+    h3 += b;
+    b = h3 >> 26;
+    h3 = h3 & 0x3ffffff;
+    h4 += b;
+    b = h4 >> 26;
+    h4 = h4 & 0x3ffffff;
+    h0 += b * 5;
+    b = h0 >> 26;
+    h0 = h0 & 0x3ffffff;
+    h1 += b;
+
+    g0 = h0 + 5;
+    b = g0 >> 26;
+    g0 &= 0x3ffffff;
+    g1 = h1 + b;
+    b = g1 >> 26;
+    g1 &= 0x3ffffff;
+    g2 = h2 + b;
+    b = g2 >> 26;
+    g2 &= 0x3ffffff;
+    g3 = h3 + b;
+    b = g3 >> 26;
+    g3 &= 0x3ffffff;
+    g4 = h4 + b - (1 << 26);
+
+    b = (g4 >> 31) - 1;
+    nb = ~b;
+    h0 = (h0 & nb) | (g0 & b);
+    h1 = (h1 & nb) | (g1 & b);
+    h2 = (h2 & nb) | (g2 & b);
+    h3 = (h3 & nb) | (g3 & b);
+    h4 = (h4 & nb) | (g4 & b);
+
+    f0 = ((h0) | (h1 << 26)) + (uint64_t)U8TO32_LE(&key[16]);
+    f1 = ((h1 >> 6) | (h2 << 20)) + (uint64_t)U8TO32_LE(&key[20]);
+    f2 = ((h2 >> 12) | (h3 << 14)) + (uint64_t)U8TO32_LE(&key[24]);
+    f3 = ((h3 >> 18) | (h4 << 8)) + (uint64_t)U8TO32_LE(&key[28]);
+
+    U32TO8_LE(&out[0], f0);
+    f1 += (f0 >> 32);
+    U32TO8_LE(&out[4], f1);
+    f2 += (f1 >> 32);
+    U32TO8_LE(&out[8], f2);
+    f3 += (f2 >> 32);
+    U32TO8_LE(&out[12], f3);
+}
+
+FUZZ_TARGET(crypto_diff_fuzz_poly1305)
+{
+    FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
+
+    const std::vector<uint8_t> key = ConsumeFixedLengthByteVector(fuzzed_data_provider, POLY1305_KEYLEN);
+    const std::vector<uint8_t> in = ConsumeRandomLengthByteVector(fuzzed_data_provider);
+
+    std::vector<uint8_t> tag_out(POLY1305_TAGLEN);
+    std::vector<uint8_t> tag_out_floodyberry(POLY1305_TAGLEN);
+    poly1305_auth(tag_out.data(), in.data(), in.size(), key.data());
+    poly1305_auth_floodyberry(tag_out_floodyberry.data(), in.data(), in.size(), key.data());
+
+    assert(memcmp(tag_out.data(), tag_out_floodyberry.data(), POLY1305_TAGLEN) == 0);
+}
+