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Merge bitcoin/bitcoin#22704: fuzz: Differential fuzzing to compare Bitcoin Core's and D. J. Bernstein's implementation of ChaCha20
4d0ac72f3ae78e3c6a0d5dc4f7e809583abd0546 [fuzz] Add fuzzing harness to compare both implementations of ChaCha20 (stratospher)
65ef93203cc6a977c8e96f07cb9155f46faf5004 [fuzz] Add D. J. Bernstein's implementation of ChaCha20 (stratospher)
Pull request description:
This PR compares Bitcoin Core's implementation of ChaCha20 with D. J. Bernstein's in order to find implementation discrepancies if any.
ACKs for top commit:
laanwj:
Code review ACK 4d0ac72f3ae78e3c6a0d5dc4f7e809583abd0546
Tree-SHA512: f826144b4db61b9cbdd7efaaca8fa9cbb899953065bc8a26820a566303b2ab6a17431e7c114635789f0a63fbe3b65cb0bf2ab85baf882803a5ee172af4881544
This commit is contained in:
W. J. van der Laan
PastaPastaPasta
parent
47828bd76b
commit
c8650ec003
@ -254,6 +254,7 @@ test_fuzz_fuzz_SOURCES = \
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test/fuzz/crypto_chacha20.cpp \
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test/fuzz/crypto_chacha20_poly1305_aead.cpp \
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test/fuzz/crypto_common.cpp \
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test/fuzz/crypto_diff_fuzz_chacha20.cpp \
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test/fuzz/crypto_hkdf_hmac_sha256_l32.cpp \
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test/fuzz/crypto_poly1305.cpp \
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test/fuzz/cuckoocache.cpp \
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330
src/test/fuzz/crypto_diff_fuzz_chacha20.cpp
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330
src/test/fuzz/crypto_diff_fuzz_chacha20.cpp
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@ -0,0 +1,330 @@
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// Copyright (c) 2020-2021 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <crypto/chacha20.h>
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#include <test/fuzz/FuzzedDataProvider.h>
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#include <test/fuzz/fuzz.h>
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#include <test/fuzz/util.h>
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#include <cstdint>
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#include <vector>
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/*
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From https://cr.yp.to/chacha.html
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chacha-merged.c version 20080118
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D. J. Bernstein
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Public domain.
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*/
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typedef unsigned int u32;
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typedef unsigned char u8;
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#define U8C(v) (v##U)
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#define U32C(v) (v##U)
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#define U8V(v) ((u8)(v)&U8C(0xFF))
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#define U32V(v) ((u32)(v)&U32C(0xFFFFFFFF))
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#define ROTL32(v, n) (U32V((v) << (n)) | ((v) >> (32 - (n))))
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#define U8TO32_LITTLE(p) \
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(((u32)((p)[0])) | ((u32)((p)[1]) << 8) | ((u32)((p)[2]) << 16) | \
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((u32)((p)[3]) << 24))
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#define U32TO8_LITTLE(p, v) \
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do { \
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(p)[0] = U8V((v)); \
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(p)[1] = U8V((v) >> 8); \
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(p)[2] = U8V((v) >> 16); \
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(p)[3] = U8V((v) >> 24); \
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} while (0)
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/* ------------------------------------------------------------------------- */
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/* Data structures */
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typedef struct
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{
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u32 input[16];
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} ECRYPT_ctx;
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/* ------------------------------------------------------------------------- */
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/* Mandatory functions */
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void ECRYPT_keysetup(
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ECRYPT_ctx* ctx,
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const u8* key,
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u32 keysize, /* Key size in bits. */
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u32 ivsize); /* IV size in bits. */
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void ECRYPT_ivsetup(
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ECRYPT_ctx* ctx,
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const u8* iv);
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void ECRYPT_encrypt_bytes(
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ECRYPT_ctx* ctx,
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const u8* plaintext,
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u8* ciphertext,
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u32 msglen); /* Message length in bytes. */
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/* ------------------------------------------------------------------------- */
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/* Optional features */
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void ECRYPT_keystream_bytes(
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ECRYPT_ctx* ctx,
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u8* keystream,
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u32 length); /* Length of keystream in bytes. */
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/* ------------------------------------------------------------------------- */
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#define ROTATE(v, c) (ROTL32(v, c))
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#define XOR(v, w) ((v) ^ (w))
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#define PLUS(v, w) (U32V((v) + (w)))
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#define PLUSONE(v) (PLUS((v), 1))
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#define QUARTERROUND(a, b, c, d) \
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a = PLUS(a, b); d = ROTATE(XOR(d, a), 16); \
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c = PLUS(c, d); b = ROTATE(XOR(b, c), 12); \
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a = PLUS(a, b); d = ROTATE(XOR(d, a), 8); \
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c = PLUS(c, d); b = ROTATE(XOR(b, c), 7);
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static const char sigma[] = "expand 32-byte k";
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static const char tau[] = "expand 16-byte k";
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void ECRYPT_keysetup(ECRYPT_ctx* x, const u8* k, u32 kbits, u32 ivbits)
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{
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const char* constants;
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x->input[4] = U8TO32_LITTLE(k + 0);
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x->input[5] = U8TO32_LITTLE(k + 4);
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x->input[6] = U8TO32_LITTLE(k + 8);
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x->input[7] = U8TO32_LITTLE(k + 12);
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if (kbits == 256) { /* recommended */
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k += 16;
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constants = sigma;
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} else { /* kbits == 128 */
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constants = tau;
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}
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x->input[8] = U8TO32_LITTLE(k + 0);
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x->input[9] = U8TO32_LITTLE(k + 4);
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x->input[10] = U8TO32_LITTLE(k + 8);
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x->input[11] = U8TO32_LITTLE(k + 12);
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x->input[0] = U8TO32_LITTLE(constants + 0);
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x->input[1] = U8TO32_LITTLE(constants + 4);
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x->input[2] = U8TO32_LITTLE(constants + 8);
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x->input[3] = U8TO32_LITTLE(constants + 12);
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}
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void ECRYPT_ivsetup(ECRYPT_ctx* x, const u8* iv)
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{
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x->input[12] = 0;
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x->input[13] = 0;
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x->input[14] = U8TO32_LITTLE(iv + 0);
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x->input[15] = U8TO32_LITTLE(iv + 4);
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}
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void ECRYPT_encrypt_bytes(ECRYPT_ctx* x, const u8* m, u8* c, u32 bytes)
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{
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u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
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u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
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u8* ctarget = NULL;
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u8 tmp[64];
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uint32_t i;
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if (!bytes) return;
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j0 = x->input[0];
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j1 = x->input[1];
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j2 = x->input[2];
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j3 = x->input[3];
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j4 = x->input[4];
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j5 = x->input[5];
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j6 = x->input[6];
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j7 = x->input[7];
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j8 = x->input[8];
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j9 = x->input[9];
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j10 = x->input[10];
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j11 = x->input[11];
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j12 = x->input[12];
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j13 = x->input[13];
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j14 = x->input[14];
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j15 = x->input[15];
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for (;;) {
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if (bytes < 64) {
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for (i = 0; i < bytes; ++i)
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tmp[i] = m[i];
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m = tmp;
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ctarget = c;
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c = tmp;
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}
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x0 = j0;
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x1 = j1;
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x2 = j2;
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x3 = j3;
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x4 = j4;
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x5 = j5;
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x6 = j6;
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x7 = j7;
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x8 = j8;
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x9 = j9;
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x10 = j10;
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x11 = j11;
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x12 = j12;
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x13 = j13;
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x14 = j14;
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x15 = j15;
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for (i = 20; i > 0; i -= 2) {
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QUARTERROUND(x0, x4, x8, x12)
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QUARTERROUND(x1, x5, x9, x13)
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QUARTERROUND(x2, x6, x10, x14)
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QUARTERROUND(x3, x7, x11, x15)
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QUARTERROUND(x0, x5, x10, x15)
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QUARTERROUND(x1, x6, x11, x12)
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QUARTERROUND(x2, x7, x8, x13)
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QUARTERROUND(x3, x4, x9, x14)
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}
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x0 = PLUS(x0, j0);
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x1 = PLUS(x1, j1);
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x2 = PLUS(x2, j2);
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x3 = PLUS(x3, j3);
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x4 = PLUS(x4, j4);
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x5 = PLUS(x5, j5);
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x6 = PLUS(x6, j6);
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x7 = PLUS(x7, j7);
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x8 = PLUS(x8, j8);
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x9 = PLUS(x9, j9);
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x10 = PLUS(x10, j10);
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x11 = PLUS(x11, j11);
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x12 = PLUS(x12, j12);
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x13 = PLUS(x13, j13);
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x14 = PLUS(x14, j14);
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x15 = PLUS(x15, j15);
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x0 = XOR(x0, U8TO32_LITTLE(m + 0));
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x1 = XOR(x1, U8TO32_LITTLE(m + 4));
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x2 = XOR(x2, U8TO32_LITTLE(m + 8));
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x3 = XOR(x3, U8TO32_LITTLE(m + 12));
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x4 = XOR(x4, U8TO32_LITTLE(m + 16));
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x5 = XOR(x5, U8TO32_LITTLE(m + 20));
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x6 = XOR(x6, U8TO32_LITTLE(m + 24));
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x7 = XOR(x7, U8TO32_LITTLE(m + 28));
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x8 = XOR(x8, U8TO32_LITTLE(m + 32));
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x9 = XOR(x9, U8TO32_LITTLE(m + 36));
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x10 = XOR(x10, U8TO32_LITTLE(m + 40));
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x11 = XOR(x11, U8TO32_LITTLE(m + 44));
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x12 = XOR(x12, U8TO32_LITTLE(m + 48));
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x13 = XOR(x13, U8TO32_LITTLE(m + 52));
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x14 = XOR(x14, U8TO32_LITTLE(m + 56));
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x15 = XOR(x15, U8TO32_LITTLE(m + 60));
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j12 = PLUSONE(j12);
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if (!j12) {
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j13 = PLUSONE(j13);
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/* stopping at 2^70 bytes per nonce is user's responsibility */
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}
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U32TO8_LITTLE(c + 0, x0);
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U32TO8_LITTLE(c + 4, x1);
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U32TO8_LITTLE(c + 8, x2);
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U32TO8_LITTLE(c + 12, x3);
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U32TO8_LITTLE(c + 16, x4);
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U32TO8_LITTLE(c + 20, x5);
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U32TO8_LITTLE(c + 24, x6);
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U32TO8_LITTLE(c + 28, x7);
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U32TO8_LITTLE(c + 32, x8);
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U32TO8_LITTLE(c + 36, x9);
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U32TO8_LITTLE(c + 40, x10);
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U32TO8_LITTLE(c + 44, x11);
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U32TO8_LITTLE(c + 48, x12);
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U32TO8_LITTLE(c + 52, x13);
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U32TO8_LITTLE(c + 56, x14);
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U32TO8_LITTLE(c + 60, x15);
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if (bytes <= 64) {
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if (bytes < 64) {
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for (i = 0; i < bytes; ++i)
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ctarget[i] = c[i];
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}
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x->input[12] = j12;
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x->input[13] = j13;
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return;
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}
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bytes -= 64;
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c += 64;
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m += 64;
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}
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}
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void ECRYPT_keystream_bytes(ECRYPT_ctx* x, u8* stream, u32 bytes)
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{
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u32 i;
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for (i = 0; i < bytes; ++i)
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stream[i] = 0;
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ECRYPT_encrypt_bytes(x, stream, stream, bytes);
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}
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FUZZ_TARGET(crypto_diff_fuzz_chacha20)
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{
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FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
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ChaCha20 chacha20;
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ECRYPT_ctx ctx;
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// D. J. Bernstein doesn't initialise ctx to 0 while Bitcoin Core initialises chacha20 to 0 in the constructor
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for (int i = 0; i < 16; i++) {
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ctx.input[i] = 0;
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}
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if (fuzzed_data_provider.ConsumeBool()) {
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const std::vector<unsigned char> key = ConsumeFixedLengthByteVector(fuzzed_data_provider, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(16, 32));
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chacha20 = ChaCha20{key.data(), key.size()};
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ECRYPT_keysetup(&ctx, key.data(), key.size() * 8, 0);
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// ECRYPT_keysetup() doesn't set the counter and nonce to 0 while SetKey() does
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uint8_t iv[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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ECRYPT_ivsetup(&ctx, iv);
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}
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LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 3000) {
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CallOneOf(
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fuzzed_data_provider,
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[&] {
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const std::vector<unsigned char> key = ConsumeFixedLengthByteVector(fuzzed_data_provider, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(16, 32));
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chacha20.SetKey(key.data(), key.size());
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ECRYPT_keysetup(&ctx, key.data(), key.size() * 8, 0);
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// ECRYPT_keysetup() doesn't set the counter and nonce to 0 while SetKey() does
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uint8_t iv[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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ECRYPT_ivsetup(&ctx, iv);
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},
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[&] {
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uint64_t iv = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
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chacha20.SetIV(iv);
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ctx.input[14] = iv;
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ctx.input[15] = iv >> 32;
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},
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[&] {
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uint64_t counter = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
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chacha20.Seek(counter);
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ctx.input[12] = counter;
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ctx.input[13] = counter >> 32;
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},
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[&] {
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uint32_t integralInRange = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, 4096);
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std::vector<uint8_t> output(integralInRange);
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chacha20.Keystream(output.data(), output.size());
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std::vector<uint8_t> djb_output(integralInRange);
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ECRYPT_keystream_bytes(&ctx, djb_output.data(), djb_output.size());
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if (output.data() != NULL && djb_output.data() != NULL) {
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assert(memcmp(output.data(), djb_output.data(), integralInRange) == 0);
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}
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},
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[&] {
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uint32_t integralInRange = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, 4096);
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std::vector<uint8_t> output(integralInRange);
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const std::vector<uint8_t> input = ConsumeFixedLengthByteVector(fuzzed_data_provider, output.size());
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chacha20.Crypt(input.data(), output.data(), input.size());
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std::vector<uint8_t> djb_output(integralInRange);
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ECRYPT_encrypt_bytes(&ctx, input.data(), djb_output.data(), input.size());
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});
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}
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}
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