cregit-Linux how code gets into the kernel

Release 4.17 crypto/rmd256.c

Directory: crypto
/*
 * Cryptographic API.
 *
 * RIPEMD-256 - RACE Integrity Primitives Evaluation Message Digest.
 *
 * Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC
 *
 * Copyright (c) 2008 Adrian-Ken Rueegsegger <ken@codelabs.ch>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <asm/byteorder.h>

#include "ripemd.h"


struct rmd256_ctx {
	
u64 byte_count;
	
u32 state[8];
	
__le32 buffer[16];
};


#define K1  RMD_K1

#define K2  RMD_K2

#define K3  RMD_K3

#define K4  RMD_K4

#define KK1 RMD_K6

#define KK2 RMD_K7

#define KK3 RMD_K8

#define KK4 RMD_K1


#define F1(x, y, z) (x ^ y ^ z)		
/* XOR */

#define F2(x, y, z) (z ^ (x & (y ^ z)))	
/* x ? y : z */

#define F3(x, y, z) ((x | ~y) ^ z)

#define F4(x, y, z) (y ^ (z & (x ^ y)))	
/* z ? x : y */


#define ROUND(a, b, c, d, f, k, x, s)  { \
        (a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
        (a) = rol32((a), (s)); \
}


static void rmd256_transform(u32 *state, const __le32 *in) { u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd, tmp; /* Initialize left lane */ aa = state[0]; bb = state[1]; cc = state[2]; dd = state[3]; /* Initialize right lane */ aaa = state[4]; bbb = state[5]; ccc = state[6]; ddd = state[7]; /* round 1: left lane */ ROUND(aa, bb, cc, dd, F1, K1, in[0], 11); ROUND(dd, aa, bb, cc, F1, K1, in[1], 14); ROUND(cc, dd, aa, bb, F1, K1, in[2], 15); ROUND(bb, cc, dd, aa, F1, K1, in[3], 12); ROUND(aa, bb, cc, dd, F1, K1, in[4], 5); ROUND(dd, aa, bb, cc, F1, K1, in[5], 8); ROUND(cc, dd, aa, bb, F1, K1, in[6], 7); ROUND(bb, cc, dd, aa, F1, K1, in[7], 9); ROUND(aa, bb, cc, dd, F1, K1, in[8], 11); ROUND(dd, aa, bb, cc, F1, K1, in[9], 13); ROUND(cc, dd, aa, bb, F1, K1, in[10], 14); ROUND(bb, cc, dd, aa, F1, K1, in[11], 15); ROUND(aa, bb, cc, dd, F1, K1, in[12], 6); ROUND(dd, aa, bb, cc, F1, K1, in[13], 7); ROUND(cc, dd, aa, bb, F1, K1, in[14], 9); ROUND(bb, cc, dd, aa, F1, K1, in[15], 8); /* round 1: right lane */ ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5], 8); ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14], 9); ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7], 9); ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0], 11); ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9], 13); ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2], 15); ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15); ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4], 5); ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13], 7); ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6], 7); ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15], 8); ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8], 11); ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1], 14); ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14); ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3], 12); ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12], 6); /* Swap contents of "a" registers */ tmp = aa; aa = aaa; aaa = tmp; /* round 2: left lane */ ROUND(aa, bb, cc, dd, F2, K2, in[7], 7); ROUND(dd, aa, bb, cc, F2, K2, in[4], 6); ROUND(cc, dd, aa, bb, F2, K2, in[13], 8); ROUND(bb, cc, dd, aa, F2, K2, in[1], 13); ROUND(aa, bb, cc, dd, F2, K2, in[10], 11); ROUND(dd, aa, bb, cc, F2, K2, in[6], 9); ROUND(cc, dd, aa, bb, F2, K2, in[15], 7); ROUND(bb, cc, dd, aa, F2, K2, in[3], 15); ROUND(aa, bb, cc, dd, F2, K2, in[12], 7); ROUND(dd, aa, bb, cc, F2, K2, in[0], 12); ROUND(cc, dd, aa, bb, F2, K2, in[9], 15); ROUND(bb, cc, dd, aa, F2, K2, in[5], 9); ROUND(aa, bb, cc, dd, F2, K2, in[2], 11); ROUND(dd, aa, bb, cc, F2, K2, in[14], 7); ROUND(cc, dd, aa, bb, F2, K2, in[11], 13); ROUND(bb, cc, dd, aa, F2, K2, in[8], 12); /* round 2: right lane */ ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6], 9); ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13); ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3], 15); ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7], 7); ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0], 12); ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13], 8); ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5], 9); ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11); ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14], 7); ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15], 7); ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8], 12); ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12], 7); ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4], 6); ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9], 15); ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1], 13); ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2], 11); /* Swap contents of "b" registers */ tmp = bb; bb = bbb; bbb = tmp; /* round 3: left lane */ ROUND(aa, bb, cc, dd, F3, K3, in[3], 11); ROUND(dd, aa, bb, cc, F3, K3, in[10], 13); ROUND(cc, dd, aa, bb, F3, K3, in[14], 6); ROUND(bb, cc, dd, aa, F3, K3, in[4], 7); ROUND(aa, bb, cc, dd, F3, K3, in[9], 14); ROUND(dd, aa, bb, cc, F3, K3, in[15], 9); ROUND(cc, dd, aa, bb, F3, K3, in[8], 13); ROUND(bb, cc, dd, aa, F3, K3, in[1], 15); ROUND(aa, bb, cc, dd, F3, K3, in[2], 14); ROUND(dd, aa, bb, cc, F3, K3, in[7], 8); ROUND(cc, dd, aa, bb, F3, K3, in[0], 13); ROUND(bb, cc, dd, aa, F3, K3, in[6], 6); ROUND(aa, bb, cc, dd, F3, K3, in[13], 5); ROUND(dd, aa, bb, cc, F3, K3, in[11], 12); ROUND(cc, dd, aa, bb, F3, K3, in[5], 7); ROUND(bb, cc, dd, aa, F3, K3, in[12], 5); /* round 3: right lane */ ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15], 9); ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5], 7); ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1], 15); ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3], 11); ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7], 8); ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14], 6); ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6], 6); ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9], 14); ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12); ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8], 13); ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12], 5); ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2], 14); ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13); ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0], 13); ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4], 7); ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13], 5); /* Swap contents of "c" registers */ tmp = cc; cc = ccc; ccc = tmp; /* round 4: left lane */ ROUND(aa, bb, cc, dd, F4, K4, in[1], 11); ROUND(dd, aa, bb, cc, F4, K4, in[9], 12); ROUND(cc, dd, aa, bb, F4, K4, in[11], 14); ROUND(bb, cc, dd, aa, F4, K4, in[10], 15); ROUND(aa, bb, cc, dd, F4, K4, in[0], 14); ROUND(dd, aa, bb, cc, F4, K4, in[8], 15); ROUND(cc, dd, aa, bb, F4, K4, in[12], 9); ROUND(bb, cc, dd, aa, F4, K4, in[4], 8); ROUND(aa, bb, cc, dd, F4, K4, in[13], 9); ROUND(dd, aa, bb, cc, F4, K4, in[3], 14); ROUND(cc, dd, aa, bb, F4, K4, in[7], 5); ROUND(bb, cc, dd, aa, F4, K4, in[15], 6); ROUND(aa, bb, cc, dd, F4, K4, in[14], 8); ROUND(dd, aa, bb, cc, F4, K4, in[5], 6); ROUND(cc, dd, aa, bb, F4, K4, in[6], 5); ROUND(bb, cc, dd, aa, F4, K4, in[2], 12); /* round 4: right lane */ ROUND(aaa, bbb, ccc, ddd, F1, KK4, in