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Summary: This adds a SHA1 implementation taken from public domain code. The change is trivial, but as it involves third-party code I'd like a second pair of eyes before commit. LibFuzzer can not use SHA1 from openssl because openssl may not be available and because we may be fuzzing openssl itself. Using sha1sum via a pipe is too slow. Test Plan: n/a Reviewers: chandlerc Reviewed By: chandlerc Subscribers: majnemer, llvm-commits Differential Revision: http://reviews.llvm.org/D9733 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237400 91177308-0d34-0410-b5e6-96231b3b80d8
203 lines
5.0 KiB
C++
203 lines
5.0 KiB
C++
//===- FuzzerSHA1.h - Private copy of the SHA1 implementation ---*- C++ -* ===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// This code is taken from public domain
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// (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c)
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// and modified by adding anonymous namespace, adding an interface
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// function fuzzer::ComputeSHA1() and removing unnecessary code.
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//
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// lib/Fuzzer can not use SHA1 implementation from openssl because
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// openssl may not be available and because we may be fuzzing openssl itself.
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// For the same reason we do not want to depend on SHA1 from LLVM tree.
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//===----------------------------------------------------------------------===//
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#include "FuzzerInternal.h"
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/* This code is public-domain - it is based on libcrypt
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* placed in the public domain by Wei Dai and other contributors.
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*/
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#include <stdint.h>
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#include <string.h>
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namespace { // Added for LibFuzzer
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#ifdef __BIG_ENDIAN__
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# define SHA_BIG_ENDIAN
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#elif defined __LITTLE_ENDIAN__
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/* override */
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#elif defined __BYTE_ORDER
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# if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define SHA_BIG_ENDIAN
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# endif
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#else // ! defined __LITTLE_ENDIAN__
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# include <endian.h> // machine/endian.h
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# if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define SHA_BIG_ENDIAN
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# endif
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#endif
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/* header */
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#define HASH_LENGTH 20
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#define BLOCK_LENGTH 64
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typedef struct sha1nfo {
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uint32_t buffer[BLOCK_LENGTH/4];
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uint32_t state[HASH_LENGTH/4];
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uint32_t byteCount;
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uint8_t bufferOffset;
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uint8_t keyBuffer[BLOCK_LENGTH];
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uint8_t innerHash[HASH_LENGTH];
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} sha1nfo;
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/* public API - prototypes - TODO: doxygen*/
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/**
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*/
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void sha1_init(sha1nfo *s);
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/**
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*/
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void sha1_writebyte(sha1nfo *s, uint8_t data);
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/**
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*/
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void sha1_write(sha1nfo *s, const char *data, size_t len);
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/**
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*/
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uint8_t* sha1_result(sha1nfo *s);
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/* code */
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#define SHA1_K0 0x5a827999
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#define SHA1_K20 0x6ed9eba1
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#define SHA1_K40 0x8f1bbcdc
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#define SHA1_K60 0xca62c1d6
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void sha1_init(sha1nfo *s) {
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s->state[0] = 0x67452301;
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s->state[1] = 0xefcdab89;
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s->state[2] = 0x98badcfe;
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s->state[3] = 0x10325476;
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s->state[4] = 0xc3d2e1f0;
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s->byteCount = 0;
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s->bufferOffset = 0;
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}
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uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
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return ((number << bits) | (number >> (32-bits)));
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}
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void sha1_hashBlock(sha1nfo *s) {
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uint8_t i;
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uint32_t a,b,c,d,e,t;
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a=s->state[0];
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b=s->state[1];
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c=s->state[2];
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d=s->state[3];
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e=s->state[4];
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for (i=0; i<80; i++) {
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if (i>=16) {
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t = s->buffer[(i+13)&15] ^ s->buffer[(i+8)&15] ^ s->buffer[(i+2)&15] ^ s->buffer[i&15];
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s->buffer[i&15] = sha1_rol32(t,1);
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}
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if (i<20) {
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t = (d ^ (b & (c ^ d))) + SHA1_K0;
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} else if (i<40) {
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t = (b ^ c ^ d) + SHA1_K20;
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} else if (i<60) {
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t = ((b & c) | (d & (b | c))) + SHA1_K40;
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} else {
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t = (b ^ c ^ d) + SHA1_K60;
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}
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t+=sha1_rol32(a,5) + e + s->buffer[i&15];
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e=d;
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d=c;
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c=sha1_rol32(b,30);
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b=a;
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a=t;
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}
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s->state[0] += a;
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s->state[1] += b;
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s->state[2] += c;
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s->state[3] += d;
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s->state[4] += e;
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}
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void sha1_addUncounted(sha1nfo *s, uint8_t data) {
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uint8_t * const b = (uint8_t*) s->buffer;
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#ifdef SHA_BIG_ENDIAN
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b[s->bufferOffset] = data;
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#else
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b[s->bufferOffset ^ 3] = data;
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#endif
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s->bufferOffset++;
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if (s->bufferOffset == BLOCK_LENGTH) {
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sha1_hashBlock(s);
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s->bufferOffset = 0;
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}
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}
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void sha1_writebyte(sha1nfo *s, uint8_t data) {
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++s->byteCount;
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sha1_addUncounted(s, data);
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}
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void sha1_write(sha1nfo *s, const char *data, size_t len) {
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for (;len--;) sha1_writebyte(s, (uint8_t) *data++);
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}
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void sha1_pad(sha1nfo *s) {
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// Implement SHA-1 padding (fips180-2 §5.1.1)
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// Pad with 0x80 followed by 0x00 until the end of the block
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sha1_addUncounted(s, 0x80);
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while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00);
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// Append length in the last 8 bytes
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sha1_addUncounted(s, 0); // We're only using 32 bit lengths
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sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths
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sha1_addUncounted(s, 0); // So zero pad the top bits
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sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8
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sha1_addUncounted(s, s->byteCount >> 21); // as SHA-1 supports bitstreams as well as
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sha1_addUncounted(s, s->byteCount >> 13); // byte.
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sha1_addUncounted(s, s->byteCount >> 5);
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sha1_addUncounted(s, s->byteCount << 3);
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}
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uint8_t* sha1_result(sha1nfo *s) {
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// Pad to complete the last block
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sha1_pad(s);
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#ifndef SHA_BIG_ENDIAN
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// Swap byte order back
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int i;
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for (i=0; i<5; i++) {
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s->state[i]=
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(((s->state[i])<<24)& 0xff000000)
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| (((s->state[i])<<8) & 0x00ff0000)
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| (((s->state[i])>>8) & 0x0000ff00)
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| (((s->state[i])>>24)& 0x000000ff);
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}
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#endif
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// Return pointer to hash (20 characters)
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return (uint8_t*) s->state;
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}
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} // namespace; Added for LibFuzzer
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// The rest is added for LibFuzzer
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void fuzzer::ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out) {
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sha1nfo s;
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sha1_init(&s);
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sha1_write(&s, (const char*)Data, Len);
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memcpy(Out, sha1_result(&s), HASH_LENGTH);
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}
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