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357 lines
12 KiB
C
357 lines
12 KiB
C
#include "ripemd160.h"
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#include <assert.h>
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#include "memzero.h"
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// Downlaoded from https://github.com/sipa/Coin25519/blob/master/src/crypto/ripemd160.c
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// adapted by Pieter Wuille in 2012; all changes are in the public domain
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/*
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*
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* RIPEMD160.c : RIPEMD-160 implementation
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*
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* Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
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*
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* ===================================================================
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* The contents of this file are dedicated to the public domain. To
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* the extent that dedication to the public domain is not available,
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* everyone is granted a worldwide, perpetual, royalty-free,
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* non-exclusive license to exercise all rights associated with the
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* contents of this file for any purpose whatsoever.
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* No rights are reserved.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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* ===================================================================
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*
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* Country of origin: Canada
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*
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* This implementation (written in C) is based on an implementation the author
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* wrote in Python.
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*
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* This implementation was written with reference to the RIPEMD-160
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* specification, which is available at:
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* http://homes.esat.kuleuven.be/~cosicart/pdf/AB-9601/
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*
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* It is also documented in the _Handbook of Applied Cryptography_, as
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* Algorithm 9.55. It's on page 30 of the following PDF file:
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* http://www.cacr.math.uwaterloo.ca/hac/about/chap9.pdf
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*
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* The RIPEMD-160 specification doesn't really tell us how to do padding, but
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* since RIPEMD-160 is inspired by MD4, you can use the padding algorithm from
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* RFC 1320.
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*
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* According to http://www.users.zetnet.co.uk/hopwood/crypto/scan/md.html:
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* "RIPEMD-160 is big-bit-endian, little-byte-endian, and left-justified."
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*/
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#include <stdint.h>
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#include <string.h>
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#define RIPEMD160_DIGEST_SIZE RIPEMD160_DIGEST_LENGTH
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/* cyclic left-shift the 32-bit word n left by s bits */
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#define ROL(s, n) (((n) << (s)) | ((n) >> (32-(s))))
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/* Initial values for the chaining variables.
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* This is just 0123456789ABCDEFFEDCBA9876543210F0E1D2C3 in little-endian. */
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static const uint32_t initial_h[5] = { 0x67452301u, 0xEFCDAB89u, 0x98BADCFEu, 0x10325476u, 0xC3D2E1F0u };
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/* Ordering of message words. Based on the permutations rho(i) and pi(i), defined as follows:
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*
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* rho(i) := { 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8 }[i] 0 <= i <= 15
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*
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* pi(i) := 9*i + 5 (mod 16)
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*
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* Line | Round 1 | Round 2 | Round 3 | Round 4 | Round 5
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* -------+-----------+-----------+-----------+-----------+-----------
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* left | id | rho | rho^2 | rho^3 | rho^4
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* right | pi | rho pi | rho^2 pi | rho^3 pi | rho^4 pi
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*/
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/* Left line */
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static const uint8_t RL[5][16] = {
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, /* Round 1: id */
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{ 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8 }, /* Round 2: rho */
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{ 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12 }, /* Round 3: rho^2 */
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{ 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2 }, /* Round 4: rho^3 */
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{ 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13 } /* Round 5: rho^4 */
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};
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/* Right line */
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static const uint8_t RR[5][16] = {
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{ 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12 }, /* Round 1: pi */
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{ 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2 }, /* Round 2: rho pi */
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{ 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13 }, /* Round 3: rho^2 pi */
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{ 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14 }, /* Round 4: rho^3 pi */
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{ 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11 } /* Round 5: rho^4 pi */
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};
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/*
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* Shifts - Since we don't actually re-order the message words according to
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* the permutations above (we could, but it would be slower), these tables
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* come with the permutations pre-applied.
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*/
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/* Shifts, left line */
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static const uint8_t SL[5][16] = {
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{ 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8 }, /* Round 1 */
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{ 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12 }, /* Round 2 */
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{ 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5 }, /* Round 3 */
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{ 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12 }, /* Round 4 */
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{ 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6 } /* Round 5 */
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};
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/* Shifts, right line */
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static const uint8_t SR[5][16] = {
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{ 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6 }, /* Round 1 */
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{ 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11 }, /* Round 2 */
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{ 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5 }, /* Round 3 */
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{ 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8 }, /* Round 4 */
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{ 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11 } /* Round 5 */
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};
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/* Boolean functions */
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#define F1(x, y, z) ((x) ^ (y) ^ (z))
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#define F2(x, y, z) (((x) & (y)) | (~(x) & (z)))
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#define F3(x, y, z) (((x) | ~(y)) ^ (z))
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#define F4(x, y, z) (((x) & (z)) | ((y) & ~(z)))
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#define F5(x, y, z) ((x) ^ ((y) | ~(z)))
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/* Round constants, left line */
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static const uint32_t KL[5] = {
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0x00000000u, /* Round 1: 0 */
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0x5A827999u, /* Round 2: floor(2**30 * sqrt(2)) */
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0x6ED9EBA1u, /* Round 3: floor(2**30 * sqrt(3)) */
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0x8F1BBCDCu, /* Round 4: floor(2**30 * sqrt(5)) */
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0xA953FD4Eu /* Round 5: floor(2**30 * sqrt(7)) */
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};
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/* Round constants, right line */
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static const uint32_t KR[5] = {
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0x50A28BE6u, /* Round 1: floor(2**30 * cubert(2)) */
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0x5C4DD124u, /* Round 2: floor(2**30 * cubert(3)) */
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0x6D703EF3u, /* Round 3: floor(2**30 * cubert(5)) */
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0x7A6D76E9u, /* Round 4: floor(2**30 * cubert(7)) */
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0x00000000u /* Round 5: 0 */
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};
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void ripemd160_init(ripemd160_state *self)
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{
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memcpy(self->h, initial_h, RIPEMD160_DIGEST_SIZE);
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memset(&self->buf, 0, sizeof(self->buf));
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self->length = 0;
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self->bufpos = 0;
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}
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#ifdef PCT_BIG_ENDIAN
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static inline void byteswap32(uint32_t *v)
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{
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union { uint32_t w; uint8_t b[4]; } x = {0}, y = {0};
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x.w = *v;
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y.b[0] = x.b[3];
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y.b[1] = x.b[2];
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y.b[2] = x.b[1];
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y.b[3] = x.b[0];
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*v = y.w;
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/* Wipe temporary variables */
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x.w = y.w = 0;
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}
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static inline void byteswap_digest(uint32_t *p)
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{
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unsigned int i = 0;
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for (i = 0; i < 4; i++) {
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byteswap32(p++);
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byteswap32(p++);
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byteswap32(p++);
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byteswap32(p++);
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}
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}
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#endif
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/* The RIPEMD160 compression function. Operates on self->buf */
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static void ripemd160_compress(ripemd160_state *self)
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{
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uint8_t w = 0, round = 0;
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uint32_t T = 0;
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uint32_t AL = 0, BL = 0, CL = 0, DL = 0, EL = 0; /* left line */
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uint32_t AR = 0, BR = 0, CR = 0, DR = 0, ER = 0; /* right line */
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/* Sanity check */
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assert(self->bufpos == 64);
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/* Byte-swap the buffer if we're on a big-endian machine */
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#ifdef PCT_BIG_ENDIAN
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byteswap_digest(self->buf.w);
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#endif
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/* Load the left and right lines with the initial state */
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AL = AR = self->h[0];
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BL = BR = self->h[1];
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CL = CR = self->h[2];
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DL = DR = self->h[3];
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EL = ER = self->h[4];
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/* Round 1 */
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round = 0;
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for (w = 0; w < 16; w++) { /* left line */
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T = ROL(SL[round][w], AL + F1(BL, CL, DL) + self->buf.w[RL[round][w]] + KL[round]) + EL;
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AL = EL; EL = DL; DL = ROL(10, CL); CL = BL; BL = T;
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}
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for (w = 0; w < 16; w++) { /* right line */
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T = ROL(SR[round][w], AR + F5(BR, CR, DR) + self->buf.w[RR[round][w]] + KR[round]) + ER;
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AR = ER; ER = DR; DR = ROL(10, CR); CR = BR; BR = T;
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}
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/* Round 2 */
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round++;
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for (w = 0; w < 16; w++) { /* left line */
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T = ROL(SL[round][w], AL + F2(BL, CL, DL) + self->buf.w[RL[round][w]] + KL[round]) + EL;
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AL = EL; EL = DL; DL = ROL(10, CL); CL = BL; BL = T;
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}
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for (w = 0; w < 16; w++) { /* right line */
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T = ROL(SR[round][w], AR + F4(BR, CR, DR) + self->buf.w[RR[round][w]] + KR[round]) + ER;
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AR = ER; ER = DR; DR = ROL(10, CR); CR = BR; BR = T;
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}
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/* Round 3 */
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round++;
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for (w = 0; w < 16; w++) { /* left line */
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T = ROL(SL[round][w], AL + F3(BL, CL, DL) + self->buf.w[RL[round][w]] + KL[round]) + EL;
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AL = EL; EL = DL; DL = ROL(10, CL); CL = BL; BL = T;
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}
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for (w = 0; w < 16; w++) { /* right line */
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T = ROL(SR[round][w], AR + F3(BR, CR, DR) + self->buf.w[RR[round][w]] + KR[round]) + ER;
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AR = ER; ER = DR; DR = ROL(10, CR); CR = BR; BR = T;
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}
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/* Round 4 */
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round++;
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for (w = 0; w < 16; w++) { /* left line */
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T = ROL(SL[round][w], AL + F4(BL, CL, DL) + self->buf.w[RL[round][w]] + KL[round]) + EL;
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AL = EL; EL = DL; DL = ROL(10, CL); CL = BL; BL = T;
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}
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for (w = 0; w < 16; w++) { /* right line */
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T = ROL(SR[round][w], AR + F2(BR, CR, DR) + self->buf.w[RR[round][w]] + KR[round]) + ER;
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AR = ER; ER = DR; DR = ROL(10, CR); CR = BR; BR = T;
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}
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/* Round 5 */
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round++;
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for (w = 0; w < 16; w++) { /* left line */
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T = ROL(SL[round][w], AL + F5(BL, CL, DL) + self->buf.w[RL[round][w]] + KL[round]) + EL;
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AL = EL; EL = DL; DL = ROL(10, CL); CL = BL; BL = T;
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}
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for (w = 0; w < 16; w++) { /* right line */
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T = ROL(SR[round][w], AR + F1(BR, CR, DR) + self->buf.w[RR[round][w]] + KR[round]) + ER;
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AR = ER; ER = DR; DR = ROL(10, CR); CR = BR; BR = T;
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}
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/* Final mixing stage */
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T = self->h[1] + CL + DR;
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self->h[1] = self->h[2] + DL + ER;
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self->h[2] = self->h[3] + EL + AR;
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self->h[3] = self->h[4] + AL + BR;
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self->h[4] = self->h[0] + BL + CR;
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self->h[0] = T;
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/* Clear the buffer and wipe the temporary variables */
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memzero(&self->buf, sizeof(self->buf));
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memzero(&T, sizeof(T));
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memzero(&AL, sizeof(AL));
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memzero(&BL, sizeof(BL));
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memzero(&CL, sizeof(CL));
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memzero(&DL, sizeof(DL));
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memzero(&EL, sizeof(EL));
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memzero(&AR, sizeof(AR));
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memzero(&BR, sizeof(BR));
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memzero(&CR, sizeof(CR));
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memzero(&DR, sizeof(DR));
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memzero(&ER, sizeof(ER));
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self->bufpos = 0;
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}
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void ripemd160_process(ripemd160_state * self, const uint8_t *p, size_t length)
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{
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unsigned long bytes_needed = 0;
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/* Some assertions */
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assert(p != NULL);
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/* We never leave a full buffer */
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assert(self->bufpos < 64);
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while (length > 0) {
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/* Figure out how many bytes we need to fill the internal buffer. */
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bytes_needed = 64 - self->bufpos;
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if ((unsigned long) length >= bytes_needed) {
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/* We have enough bytes, so copy them into the internal buffer and run
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* the compression function. */
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memcpy(&self->buf.b[self->bufpos], p, bytes_needed);
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self->bufpos += bytes_needed;
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self->length += bytes_needed << 3; /* length is in bits */
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p += bytes_needed;
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ripemd160_compress(self);
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length -= bytes_needed;
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continue;
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}
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/* We do not have enough bytes to fill the internal buffer.
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* Copy what's there and return. */
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memcpy(&self->buf.b[self->bufpos], p, length);
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self->bufpos += length;
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self->length += length << 3; /* length is in bits */
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return;
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}
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}
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void ripemd160_done(ripemd160_state * self, uint8_t out[RIPEMD160_DIGEST_LENGTH])
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{
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/* Append the padding */
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self->buf.b[self->bufpos++] = 0x80;
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if (self->bufpos > 56) {
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self->bufpos = 64;
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ripemd160_compress(self);
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}
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/* Append the length */
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self->buf.w[14] = (uint32_t) (self->length & 0xFFFFffffu);
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self->buf.w[15] = (uint32_t) ((self->length >> 32) & 0xFFFFffffu);
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#ifdef PCT_BIG_ENDIAN
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byteswap32(&self->buf.w[14]);
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byteswap32(&self->buf.w[15]);
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#endif
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self->bufpos = 64;
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ripemd160_compress(self);
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/* Copy the final state into the output buffer */
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#ifdef PCT_BIG_ENDIAN
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byteswap_digest(self->h);
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#endif
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memcpy(out, &self->h, RIPEMD160_DIGEST_SIZE);
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memzero(self, sizeof(ripemd160_state));
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}
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void ripemd160(const uint8_t *in, size_t length, uint8_t out[RIPEMD160_DIGEST_LENGTH])
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{
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ripemd160_state md = {0};
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ripemd160_init(&md);
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ripemd160_process(&md, in, length);
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ripemd160_done(&md, out);
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}
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