crypto: rmd256 - remove RIPE-MD 256 hash algorithm

RIPE-MD 256 is never referenced anywhere in the kernel, and unlikely
to be depended upon by userspace via AF_ALG. So let's remove it

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 342 deletions

diff --git a/crypto/rmd256.c b/crypto/rmd256.c
deleted file mode 100644
index 3c730e9de5fd..000000000000
--- a/crypto/rmd256.c
+++ /dev/null
@@ -1,342 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * 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>
- */
-#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;
-
-	/* 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 */
-	swap(aa, aaa);
-
-	/* 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 */
-	swap(bb, bbb);
-
-	/* 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 */
-	swap(cc, ccc);
-
-	/* 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 */
-	swap(dd, ddd);
-
-	/* 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;
-}
-
-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;
-}
-
-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;
-}
-
-/* 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;
-}
-
-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_driver_name =	"rmd256-generic",
-		.cra_blocksize	 =	RMD256_BLOCK_SIZE,
-		.cra_module	 =	THIS_MODULE,
-	}
-};
-
-static int __init rmd256_mod_init(void)
-{
-	return crypto_register_shash(&alg);
-}
-
-static void __exit rmd256_mod_fini(void)
-{
-	crypto_unregister_shash(&alg);
-}
-
-subsys_initcall(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");