cregit-Linux how code gets into the kernel

Release 4.11 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[8], 15); ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6], 5); ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4], 8); ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1], 11); ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3], 14); ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14); ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15], 6); ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0], 14); ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5], 6); ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12], 9); ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2], 12); ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13], 9); ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9], 12); ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7], 5); ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15); ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14], 8); /* Swap contents of "d" registers */ tmp = dd; dd = ddd; ddd = tmp; /* combine results */ state[0] += aa; state[1] += bb; state[2] += cc; state[3] += dd; state[4] += aaa; state[5] += bbb; state[6] += ccc; state[7] += ddd; return; }

Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger302599.97%150.00%
Harvey Harrison10.03%150.00%
Total3026100.00%2100.00%


static int rmd256_init(struct shash_desc *desc) { struct rmd256_ctx *rctx = shash_desc_ctx(desc); rctx->byte_count = 0; rctx->state[0] = RMD_H0; rctx->state[1] = RMD_H1; rctx->state[2] = RMD_H2; rctx->state[3] = RMD_H3; rctx->state[4] = RMD_H5; rctx->state[5] = RMD_H6; rctx->state[6] = RMD_H7; rctx->state[7] = RMD_H8; memset(rctx->buffer, 0, sizeof(rctx->buffer)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger11093.22%150.00%
Herbert Xu86.78%150.00%
Total118100.00%2100.00%


static int rmd256_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct rmd256_ctx *rctx = shash_desc_ctx(desc); const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f); rctx->byte_count += len; /* Enough space in buffer? If so copy and we're done */ if (avail > len) { memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail), data, len); goto out; } memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail), data, avail); rmd256_transform(rctx->state, rctx->buffer); data += avail; len -= avail; while (len >= sizeof(rctx->buffer)) { memcpy(rctx->buffer, data, sizeof(rctx->buffer)); rmd256_transform(rctx->state, rctx->buffer); data += sizeof(rctx->buffer); len -= sizeof(rctx->buffer); } memcpy(rctx->buffer, data, len); out: return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger19993.87%266.67%
Herbert Xu136.13%133.33%
Total212100.00%3100.00%

/* Add padding and return the message digest. */
static int rmd256_final(struct shash_desc *desc, u8 *out) { struct rmd256_ctx *rctx = shash_desc_ctx(desc); u32 i, index, padlen; __le64 bits; __le32 *dst = (__le32 *)out; static const u8 padding[64] = { 0x80, }; bits = cpu_to_le64(rctx->byte_count << 3); /* Pad out to 56 mod 64 */ index = rctx->byte_count & 0x3f; padlen = (index < 56) ? (56 - index) : ((64+56) - index); rmd256_update(desc, padding, padlen); /* Append length */ rmd256_update(desc, (const u8 *)&bits, sizeof(bits)); /* Store state in digest */ for (i = 0; i < 8; i++) dst[i] = cpu_to_le32p(&rctx->state[i]); /* Wipe context */ memset(rctx, 0, sizeof(*rctx)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger16191.48%240.00%
Herbert Xu126.82%240.00%
Harvey Harrison31.70%120.00%
Total176100.00%5100.00%

static struct shash_alg alg = { .digestsize = RMD256_DIGEST_SIZE, .init = rmd256_init, .update = rmd256_update, .final = rmd256_final, .descsize = sizeof(struct rmd256_ctx), .base = { .cra_name = "rmd256", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = RMD256_BLOCK_SIZE, .cra_module = THIS_MODULE, } };
static int __init rmd256_mod_init(void) { return crypto_register_shash(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger1593.75%150.00%
Herbert Xu16.25%150.00%
Total16100.00%2100.00%


static void __exit rmd256_mod_fini(void) { crypto_unregister_shash(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger1493.33%150.00%
Herbert Xu16.67%150.00%
Total15100.00%2100.00%

module_init(rmd256_mod_init); module_exit(rmd256_mod_fini); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>"); MODULE_DESCRIPTION("RIPEMD-256 Message Digest"); MODULE_ALIAS_CRYPTO("rmd256");

Overall Contributors

PersonTokensPropCommitsCommitProp
Adrian-Ken Rueegsegger372798.16%342.86%
Herbert Xu601.58%228.57%
Harvey Harrison50.13%114.29%
Kees Cook50.13%114.29%
Total3797100.00%7100.00%
Directory: crypto
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