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287 lines
8.9 KiB
C++
287 lines
8.9 KiB
C++
/*
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* This code is derived from (original license follows):
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*
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* This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
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* MD5 Message-Digest Algorithm (RFC 1321).
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*
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* Homepage:
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* http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
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*
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* Author:
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* Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
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*
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* This software was written by Alexander Peslyak in 2001. No copyright is
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* claimed, and the software is hereby placed in the public domain.
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* In case this attempt to disclaim copyright and place the software in the
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* public domain is deemed null and void, then the software is
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* Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
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* general public under the following terms:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted.
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*
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* There's ABSOLUTELY NO WARRANTY, express or implied.
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*
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* (This is a heavily cut-down "BSD license".)
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*
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* This differs from Colin Plumb's older public domain implementation in that
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* no exactly 32-bit integer data type is required (any 32-bit or wider
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* unsigned integer data type will do), there's no compile-time endianness
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* configuration, and the function prototypes match OpenSSL's. No code from
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* Colin Plumb's implementation has been reused; this comment merely compares
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* the properties of the two independent implementations.
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*
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* The primary goals of this implementation are portability and ease of use.
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* It is meant to be fast, but not as fast as possible. Some known
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* optimizations are not included to reduce source code size and avoid
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* compile-time configuration.
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*/
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/MD5.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstring>
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// The basic MD5 functions.
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// F and G are optimized compared to their RFC 1321 definitions for
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// architectures that lack an AND-NOT instruction, just like in Colin Plumb's
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// implementation.
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#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | ~(z)))
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// The MD5 transformation for all four rounds.
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#define STEP(f, a, b, c, d, x, t, s) \
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(a) += f((b), (c), (d)) + (x) + (t); \
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(a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
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(a) += (b);
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// SET reads 4 input bytes in little-endian byte order and stores them
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// in a properly aligned word in host byte order.
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#define SET(n) \
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(block[(n)] = \
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(MD5_u32plus) ptr[(n) * 4] | ((MD5_u32plus) ptr[(n) * 4 + 1] << 8) | \
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((MD5_u32plus) ptr[(n) * 4 + 2] << 16) | \
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((MD5_u32plus) ptr[(n) * 4 + 3] << 24))
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#define GET(n) (block[(n)])
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namespace llvm {
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/// \brief This processes one or more 64-byte data blocks, but does NOT update
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///the bit counters. There are no alignment requirements.
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const uint8_t *MD5::body(ArrayRef<uint8_t> Data) {
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const uint8_t *ptr;
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MD5_u32plus a, b, c, d;
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MD5_u32plus saved_a, saved_b, saved_c, saved_d;
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unsigned long Size = Data.size();
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ptr = Data.data();
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a = this->a;
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b = this->b;
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c = this->c;
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d = this->d;
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do {
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saved_a = a;
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saved_b = b;
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saved_c = c;
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saved_d = d;
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// Round 1
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STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
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STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
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STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
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STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
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STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
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STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
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STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
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STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
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STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
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STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
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STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
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STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
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STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
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STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
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STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
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STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
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// Round 2
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STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
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STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
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STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
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STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
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STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
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STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
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STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
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STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
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STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
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STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
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STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
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STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
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STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
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STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
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STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
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STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
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// Round 3
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STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
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STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
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STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
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STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
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STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
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STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
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STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
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STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
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STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
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STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
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STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
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STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
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STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
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STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
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STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
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STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
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// Round 4
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STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
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STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
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STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
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STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
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STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
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STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
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STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
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STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
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STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
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STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
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STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
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STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
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STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
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STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
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STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
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STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
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a += saved_a;
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b += saved_b;
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c += saved_c;
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d += saved_d;
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ptr += 64;
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} while (Size -= 64);
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this->a = a;
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this->b = b;
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this->c = c;
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this->d = d;
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return ptr;
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}
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MD5::MD5()
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: a(0x67452301), b(0xefcdab89), c(0x98badcfe), d(0x10325476), hi(0), lo(0) {
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}
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/// Incrementally add the bytes in \p Data to the hash.
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void MD5::update(ArrayRef<uint8_t> Data) {
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MD5_u32plus saved_lo;
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unsigned long used, free;
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const uint8_t *Ptr = Data.data();
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unsigned long Size = Data.size();
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saved_lo = lo;
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if ((lo = (saved_lo + Size) & 0x1fffffff) < saved_lo)
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hi++;
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hi += Size >> 29;
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used = saved_lo & 0x3f;
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if (used) {
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free = 64 - used;
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if (Size < free) {
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memcpy(&buffer[used], Ptr, Size);
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return;
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}
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memcpy(&buffer[used], Ptr, free);
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Ptr = Ptr + free;
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Size -= free;
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body(makeArrayRef(buffer, 64));
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}
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if (Size >= 64) {
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Ptr = body(makeArrayRef(Ptr, Size & ~(unsigned long) 0x3f));
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Size &= 0x3f;
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}
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memcpy(buffer, Ptr, Size);
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}
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/// Add the bytes in the StringRef \p Str to the hash.
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// Note that this isn't a string and so this won't include any trailing NULL
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// bytes.
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void MD5::update(StringRef Str) {
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ArrayRef<uint8_t> SVal((const uint8_t *)Str.data(), Str.size());
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update(SVal);
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}
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/// \brief Finish the hash and place the resulting hash into \p result.
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/// \param result is assumed to be a minimum of 16-bytes in size.
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void MD5::final(MD5Result &Result) {
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unsigned long used, free;
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used = lo & 0x3f;
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buffer[used++] = 0x80;
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free = 64 - used;
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if (free < 8) {
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memset(&buffer[used], 0, free);
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body(makeArrayRef(buffer, 64));
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used = 0;
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free = 64;
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}
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memset(&buffer[used], 0, free - 8);
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lo <<= 3;
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buffer[56] = lo;
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buffer[57] = lo >> 8;
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buffer[58] = lo >> 16;
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buffer[59] = lo >> 24;
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buffer[60] = hi;
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buffer[61] = hi >> 8;
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buffer[62] = hi >> 16;
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buffer[63] = hi >> 24;
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body(makeArrayRef(buffer, 64));
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Result[0] = a;
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Result[1] = a >> 8;
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Result[2] = a >> 16;
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Result[3] = a >> 24;
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Result[4] = b;
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Result[5] = b >> 8;
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Result[6] = b >> 16;
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Result[7] = b >> 24;
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Result[8] = c;
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Result[9] = c >> 8;
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Result[10] = c >> 16;
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Result[11] = c >> 24;
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Result[12] = d;
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Result[13] = d >> 8;
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Result[14] = d >> 16;
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Result[15] = d >> 24;
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}
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void MD5::stringifyResult(MD5Result &Result, SmallString<32> &Str) {
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raw_svector_ostream Res(Str);
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for (int i = 0; i < 16; ++i)
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Res << format("%.2x", Result[i]);
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}
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}
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