// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Cryptographic API.
 *
 * RIPEMD-160 - 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/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include "ripemd.h"

struct rmd160_ctx {
        u64 byte_count;
        u32 state[5];
};

#define K1  RMD_K1
#define K2  RMD_K2
#define K3  RMD_K3
#define K4  RMD_K4
#define K5  RMD_K5
#define KK1 RMD_K6
#define KK2 RMD_K7
#define KK3 RMD_K8
#define KK4 RMD_K9
#define KK5 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 F5(x, y, z) (x ^ (y | ~z))

#define ROUND(a, b, c, d, e, f, k, x, s)  { \
        (a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
        (a) = rol32((a), (s)) + (e); \
        (c) = rol32((c), 10); \
}

static void rmd160_transform(u32 *state, const __le32 *in)
{
        u32 aa, bb, cc, dd, ee, aaa, bbb, ccc, ddd, eee;

        /* Initialize left lane */
        aa = state[0];
        bb = state[1];
        cc = state[2];
        dd = state[3];
        ee = state[4];

        /* Initialize right lane */
        aaa = state[0];
        bbb = state[1];
        ccc = state[2];
        ddd = state[3];
        eee = state[4];

        /* round 1: left lane */
        ROUND(aa, bb, cc, dd, ee, F1, K1, in[0],  11);
        ROUND(ee, aa, bb, cc, dd, F1, K1, in[1],  14);
        ROUND(dd, ee, aa, bb, cc, F1, K1, in[2],  15);
        ROUND(cc, dd, ee, aa, bb, F1, K1, in[3],  12);
        ROUND(bb, cc, dd, ee, aa, F1, K1, in[4],   5);
        ROUND(aa, bb, cc, dd, ee, F1, K1, in[5],   8);
        ROUND(ee, aa, bb, cc, dd, F1, K1, in[6],   7);
        ROUND(dd, ee, aa, bb, cc, F1, K1, in[7],   9);
        ROUND(cc, dd, ee, aa, bb, F1, K1, in[8],  11);
        ROUND(bb, cc, dd, ee, aa, F1, K1, in[9],  13);
        ROUND(aa, bb, cc, dd, ee, F1, K1, in[10], 14);
        ROUND(ee, aa, bb, cc, dd, F1, K1, in[11], 15);
        ROUND(dd, ee, aa, bb, cc, F1, K1, in[12],  6);
        ROUND(cc, dd, ee, aa, bb, F1, K1, in[13],  7);
        ROUND(bb, cc, dd, ee, aa, F1, K1, in[14],  9);
        ROUND(aa, bb, cc, dd, ee, F1, K1, in[15],  8);

        /* round 2: left lane" */
        ROUND(ee, aa, bb, cc, dd, F2, K2, in[7],   7);
        ROUND(dd, ee, aa, bb, cc, F2, K2, in[4],   6);
        ROUND(cc, dd, ee, aa, bb, F2, K2, in[13],  8);
        ROUND(bb, cc, dd, ee, aa, F2, K2, in[1],  13);
        ROUND(aa, bb, cc, dd, ee, F2, K2, in[10], 11);
        ROUND(ee, aa, bb, cc, dd, F2, K2, in[6],   9);
        ROUND(dd, ee, aa, bb, cc, F2, K2, in[15],  7);
        ROUND(cc, dd, ee, aa, bb, F2, K2, in[3],  15);
        ROUND(bb, cc, dd, ee, aa, F2, K2, in[12],  7);
        ROUND(aa, bb, cc, dd, ee, F2, K2, in[0],  12);
        ROUND(ee, aa, bb, cc, dd, F2, K2, in[9],  15);
        ROUND(dd, ee, aa, bb, cc, F2, K2, in[5],   9);
        ROUND(cc, dd, ee, aa, bb, F2, K2, in[2],  11);
        ROUND(bb, cc, dd, ee, aa, F2, K2, in[14],  7);
        ROUND(aa, bb, cc, dd, ee, F2, K2, in[11], 13);
        ROUND(ee, aa, bb, cc, dd, F2, K2, in[8],  12);

        /* round 3: left lane" */
        ROUND(dd, ee, aa, bb, cc, F3, K3, in[3],  11);
        ROUND(cc, dd, ee, aa, bb, F3, K3, in[10], 13);
        ROUND(bb, cc, dd, ee, aa, F3, K3, in[14],  6);
        ROUND(aa, bb, cc, dd, ee, F3, K3, in[4],   7);
        ROUND(ee, aa, bb, cc, dd, F3, K3, in[9],  14);
        ROUND(dd, ee, aa, bb, cc, F3, K3, in[15],  9);
        ROUND(cc, dd, ee, aa, bb, F3, K3, in[8],  13);
        ROUND(bb, cc, dd, ee, aa, F3, K3, in[1],  15);
        ROUND(aa, bb, cc, dd, ee, F3, K3, in[2],  14);
        ROUND(ee, aa, bb, cc, dd, F3, K3, in[7],   8);
        ROUND(dd, ee, aa, bb, cc, F3, K3, in[0],  13);
        ROUND(cc, dd, ee, aa, bb, F3, K3, in[6],   6);
        ROUND(bb, cc, dd, ee, aa, F3, K3, in[13],  5);
        ROUND(aa, bb, cc, dd, ee, F3, K3, in[11], 12);
        ROUND(ee, aa, bb, cc, dd, F3, K3, in[5],   7);
        ROUND(dd, ee, aa, bb, cc, F3, K3, in[12],  5);

        /* round 4: left lane" */
        ROUND(cc, dd, ee, aa, bb, F4, K4, in[1],  11);
        ROUND(bb, cc, dd, ee, aa, F4, K4, in[9],  12);
        ROUND(aa, bb, cc, dd, ee, F4, K4, in[11], 14);
        ROUND(ee, aa, bb, cc, dd, F4, K4, in[10], 15);
        ROUND(dd, ee, aa, bb, cc, F4, K4, in[0],  14);
        ROUND(cc, dd, ee, aa, bb, F4, K4, in[8],  15);
        ROUND(bb, cc, dd, ee, aa, F4, K4, in[12],  9);
        ROUND(aa, bb, cc, dd, ee, F4, K4, in[4],   8);
        ROUND(ee, aa, bb, cc, dd, F4, K4, in[13],  9);
        ROUND(dd, ee, aa, bb, cc, F4, K4, in[3],  14);
        ROUND(cc, dd, ee, aa, bb, F4, K4, in[7],   5);
        ROUND(bb, cc, dd, ee, aa, F4, K4, in[15],  6);
        ROUND(aa, bb, cc, dd, ee, F4, K4, in[14],  8);
        ROUND(ee, aa, bb, cc, dd, F4, K4, in[5],   6);
        ROUND(dd, ee, aa, bb, cc, F4, K4, in[6],   5);
        ROUND(cc, dd, ee, aa, bb, F4, K4, in[2],  12);

        /* round 5: left lane" */
        ROUND(bb, cc, dd, ee, aa, F5, K5, in[4],   9);
        ROUND(aa, bb, cc, dd, ee, F5, K5, in[0],  15);
        ROUND(ee, aa, bb, cc, dd, F5, K5, in[5],   5);
        ROUND(dd, ee, aa, bb, cc, F5, K5, in[9],  11);
        ROUND(cc, dd, ee, aa, bb, F5, K5, in[7],   6);
        ROUND(bb, cc, dd, ee, aa, F5, K5, in[12],  8);
        ROUND(aa, bb, cc, dd, ee, F5, K5, in[2],  13);
        ROUND(ee, aa, bb, cc, dd, F5, K5, in[10], 12);
        ROUND(dd, ee, aa, bb, cc, F5, K5, in[14],  5);
        ROUND(cc, dd, ee, aa, bb, F5, K5, in[1],  12);
        ROUND(bb, cc, dd, ee, aa, F5, K5, in[3],  13);
        ROUND(aa, bb, cc, dd, ee, F5, K5, in[8],  14);
        ROUND(ee, aa, bb, cc, dd, F5, K5, in[11], 11);
        ROUND(dd, ee, aa, bb, cc, F5, K5, in[6],   8);
        ROUND(cc, dd, ee, aa, bb, F5, K5, in[15],  5);
        ROUND(bb, cc, dd, ee, aa, F5, K5, in[13],  6);

        /* round 1: right lane */
        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[5],   8);
        ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[14],  9);
        ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[7],   9);
        ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[0],  11);
        ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[9],  13);
        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[2],  15);
        ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[11], 15);
        ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[4],   5);
        ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[13],  7);
        ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[6],   7);
        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[15],  8);
        ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[8],  11);
        ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[1],  14);
        ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[10], 14);
        ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[3],  12);
        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[12],  6);

        /* round 2: right lane */
        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[6],   9);
        ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[11], 13);
        ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[3],  15);
        ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[7],   7);
        ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[0],  12);
        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[13],  8);
        ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[5],   9);
        ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[10], 11);
        ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[14],  7);
        ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[15],  7);
        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[8],  12);
        ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[12],  7);
        ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[4],   6);
        ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[9],  15);
        ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[1],  13);
        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[2],  11);

        /* round 3: right lane */
        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[15],  9);
        ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[5],   7);
        ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[1],  15);
        ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[3],  11);
        ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[7],   8);
        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[14],  6);
        ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[6],   6);
        ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[9],  14);
        ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[11], 12);
        ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[8],  13);
        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[12],  5);
        ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[2],  14);
        ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[10], 13);
        ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[0],  13);
        ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[4],   7);
        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[13],  5);

        /* round 4: right lane */
        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[8],  15);
        ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[6],   5);
        ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[4],   8);
        ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[1],  11);
        ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[3],  14);
        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[11], 14);
        ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[15],  6);
        ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[0],  14);
        ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[5],   6);
        ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[12],  9);
        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[2],  12);
        ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[13],  9);
        ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[9],  12);
        ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[7],   5);
        ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[10], 15);
        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[14],  8);

        /* round 5: right lane */
        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[12],  8);
        ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[15],  5);
        ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[10], 12);
        ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[4],   9);
        ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[1],  12);
        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[5],   5);
        ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[8],  14);
        ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[7],   6);
        ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[6],   8);
        ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[2],  13);
        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[13],  6);
        ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[14],  5);
        ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[0],  15);
        ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[3],  13);
        ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[9],  11);
        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[11], 11);

        /* combine results */
        ddd += cc + state[1];           /* final result for state[0] */
        state[1] = state[2] + dd + eee;
        state[2] = state[3] + ee + aaa;
        state[3] = state[4] + aa + bbb;
        state[4] = state[0] + bb + ccc;
        state[0] = ddd;
}

static int rmd160_init(struct shash_desc *desc)
{
        struct rmd160_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_H4;

        return 0;
}

static int rmd160_update(struct shash_desc *desc, const u8 *data,
                         unsigned int len)
{
        int remain = len - round_down(len, RMD160_BLOCK_SIZE);
        struct rmd160_ctx *rctx = shash_desc_ctx(desc);
        __le32 buffer[RMD160_BLOCK_SIZE / 4];

        rctx->byte_count += len - remain;

        do {
                memcpy(buffer, data, sizeof(buffer));
                rmd160_transform(rctx->state, buffer);
                data += sizeof(buffer);
                len -= sizeof(buffer);
        } while (len >= sizeof(buffer));

        memzero_explicit(buffer, sizeof(buffer));
        return remain;
}

/* Add padding and return the message digest. */
static int rmd160_finup(struct shash_desc *desc, const u8 *src,
                        unsigned int len, u8 *out)
{
        unsigned int bit_offset = RMD160_BLOCK_SIZE / 8 - 1;
        struct rmd160_ctx *rctx = shash_desc_ctx(desc);
        union {
                __le64 l64[RMD160_BLOCK_SIZE / 4];
                __le32 l32[RMD160_BLOCK_SIZE / 2];
                u8 u8[RMD160_BLOCK_SIZE * 2];
        } block = {};
        __le32 *dst = (__le32 *)out;
        u32 i;

        rctx->byte_count += len;
        if (len >= bit_offset * 8)
                bit_offset += RMD160_BLOCK_SIZE / 8;
        memcpy(&block, src, len);
        block.u8[len] = 0x80;
        block.l64[bit_offset] = cpu_to_le64(rctx->byte_count << 3);

        rmd160_transform(rctx->state, block.l32);
        if (bit_offset > RMD160_BLOCK_SIZE / 8)
                rmd160_transform(rctx->state,
                                 block.l32 + RMD160_BLOCK_SIZE / 4);
        memzero_explicit(&block, sizeof(block));

        /* Store state in digest */
        for (i = 0; i < 5; i++)
                dst[i] = cpu_to_le32p(&rctx->state[i]);
        return 0;
}

static struct shash_alg alg = {
        .digestsize     =       RMD160_DIGEST_SIZE,
        .init           =       rmd160_init,
        .update         =       rmd160_update,
        .finup          =       rmd160_finup,
        .descsize       =       sizeof(struct rmd160_ctx),
        .base           =       {
                .cra_name        =      "rmd160",
                .cra_driver_name =      "rmd160-generic",
                .cra_flags       =      CRYPTO_AHASH_ALG_BLOCK_ONLY,
                .cra_blocksize   =      RMD160_BLOCK_SIZE,
                .cra_module      =      THIS_MODULE,
        }
};

static int __init rmd160_mod_init(void)
{
        return crypto_register_shash(&alg);
}

static void __exit rmd160_mod_fini(void)
{
        crypto_unregister_shash(&alg);
}

module_init(rmd160_mod_init);
module_exit(rmd160_mod_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
MODULE_DESCRIPTION("RIPEMD-160 Message Digest");
MODULE_ALIAS_CRYPTO("rmd160");