/* crypto/camellia/camellia_cbc.c -*- mode:C; c-file-style: "eay" -*- */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
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 *    openssl-core@openssl.org.
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 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#ifndef CAMELLIA_DEBUG
# ifndef NDEBUG
#  define NDEBUG
# endif
#endif
#include <assert.h>
#include <stdio.h>
#include <string.h>

#include <openssl/camellia.h>
#include "cmll_locl.h"

void Camellia_cbc_encrypt(const unsigned char *in, unsigned char *out,
                          const unsigned long length, const CAMELLIA_KEY *key,
                          unsigned char *ivec, const int enc)
{

    unsigned long n;
    unsigned long len = length;
    const unsigned char *iv = ivec;
    union {
        u32 t32[CAMELLIA_BLOCK_SIZE / sizeof(u32)];
        u8 t8[CAMELLIA_BLOCK_SIZE];
    } tmp;
    const union {
        long one;
        char little;
    } camellia_endian = {
        1
    };

    assert(in && out && key && ivec);
    assert((CAMELLIA_ENCRYPT == enc) || (CAMELLIA_DECRYPT == enc));

    if (((size_t)in | (size_t)out | (size_t)ivec) % sizeof(u32) == 0) {
        if (CAMELLIA_ENCRYPT == enc) {
            while (len >= CAMELLIA_BLOCK_SIZE) {
                XOR4WORD2((u32 *)out, (u32 *)in, (u32 *)iv);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                key->enc(key->rd_key, (u32 *)out);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                iv = out;
                len -= CAMELLIA_BLOCK_SIZE;
                in += CAMELLIA_BLOCK_SIZE;
                out += CAMELLIA_BLOCK_SIZE;
            }
            if (len) {
                for (n = 0; n < len; ++n)
                    out[n] = in[n] ^ iv[n];
                for (n = len; n < CAMELLIA_BLOCK_SIZE; ++n)
                    out[n] = iv[n];
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                key->enc(key->rd_key, (u32 *)out);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                iv = out;
            }
            memcpy(ivec, iv, CAMELLIA_BLOCK_SIZE);
        } else if (in != out) {
            while (len >= CAMELLIA_BLOCK_SIZE) {
                memcpy(out, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                key->dec(key->rd_key, (u32 *)out);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                XOR4WORD((u32 *)out, (u32 *)iv);
                iv = in;
                len -= CAMELLIA_BLOCK_SIZE;
                in += CAMELLIA_BLOCK_SIZE;
                out += CAMELLIA_BLOCK_SIZE;
            }
            if (len) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->dec(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                for (n = 0; n < len; ++n)
                    out[n] = tmp.t8[n] ^ iv[n];
                iv = in;
            }
            memcpy(ivec, iv, CAMELLIA_BLOCK_SIZE);
        } else {                /* in == out */

            while (len >= CAMELLIA_BLOCK_SIZE) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                key->dec(key->rd_key, (u32 *)out);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                XOR4WORD((u32 *)out, (u32 *)ivec);
                memcpy(ivec, tmp.t8, CAMELLIA_BLOCK_SIZE);
                len -= CAMELLIA_BLOCK_SIZE;
                in += CAMELLIA_BLOCK_SIZE;
                out += CAMELLIA_BLOCK_SIZE;
            }
            if (len) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                key->dec(key->rd_key, (u32 *)out);
                if (camellia_endian.little)
                    SWAP4WORD((u32 *)out);
                for (n = 0; n < len; ++n)
                    out[n] ^= ivec[n];
                for (n = len; n < CAMELLIA_BLOCK_SIZE; ++n)
                    out[n] = tmp.t8[n];
                memcpy(ivec, tmp.t8, CAMELLIA_BLOCK_SIZE);
            }
        }
    } else {                    /* no aligned */

        if (CAMELLIA_ENCRYPT == enc) {
            while (len >= CAMELLIA_BLOCK_SIZE) {
                for (n = 0; n < CAMELLIA_BLOCK_SIZE; ++n)
                    tmp.t8[n] = in[n] ^ iv[n];
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->enc(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                memcpy(out, tmp.t8, CAMELLIA_BLOCK_SIZE);
                iv = out;
                len -= CAMELLIA_BLOCK_SIZE;
                in += CAMELLIA_BLOCK_SIZE;
                out += CAMELLIA_BLOCK_SIZE;
            }
            if (len) {
                for (n = 0; n < len; ++n)
                    tmp.t8[n] = in[n] ^ iv[n];
                for (n = len; n < CAMELLIA_BLOCK_SIZE; ++n)
                    tmp.t8[n] = iv[n];
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->enc(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                memcpy(out, tmp.t8, CAMELLIA_BLOCK_SIZE);
                iv = out;
            }
            memcpy(ivec, iv, CAMELLIA_BLOCK_SIZE);
        } else if (in != out) {
            while (len >= CAMELLIA_BLOCK_SIZE) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->dec(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                for (n = 0; n < CAMELLIA_BLOCK_SIZE; ++n)
                    out[n] = tmp.t8[n] ^ iv[n];
                iv = in;
                len -= CAMELLIA_BLOCK_SIZE;
                in += CAMELLIA_BLOCK_SIZE;
                out += CAMELLIA_BLOCK_SIZE;
            }
            if (len) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->dec(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                for (n = 0; n < len; ++n)
                    out[n] = tmp.t8[n] ^ iv[n];
                iv = in;
            }
            memcpy(ivec, iv, CAMELLIA_BLOCK_SIZE);
        } else {
            while (len >= CAMELLIA_BLOCK_SIZE) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->dec(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                for (n = 0; n < CAMELLIA_BLOCK_SIZE; ++n)
                    tmp.t8[n] ^= ivec[n];
                memcpy(ivec, in, CAMELLIA_BLOCK_SIZE);
                memcpy(out, tmp.t8, CAMELLIA_BLOCK_SIZE);
                len -= CAMELLIA_BLOCK_SIZE;
                in += CAMELLIA_BLOCK_SIZE;
                out += CAMELLIA_BLOCK_SIZE;
            }
            if (len) {
                memcpy(tmp.t8, in, CAMELLIA_BLOCK_SIZE);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                key->dec(key->rd_key, tmp.t32);
                if (camellia_endian.little)
                    SWAP4WORD(tmp.t32);
                for (n = 0; n < len; ++n)
                    tmp.t8[n] ^= ivec[n];
                memcpy(ivec, in, CAMELLIA_BLOCK_SIZE);
                memcpy(out, tmp.t8, len);
            }
        }
    }
}
