Coverage Report

Created: 2024-11-21 06:47

/src/openssl/crypto/cast/c_enc.c
Line
Count
Source (jump to first uncovered line)
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/*
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 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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 *
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 * Licensed under the Apache License 2.0 (the "License").  You may not use
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 * this file except in compliance with the License.  You can obtain a copy
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 * in the file LICENSE in the source distribution or at
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 * https://www.openssl.org/source/license.html
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 */
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/*
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 * CAST low level APIs are deprecated for public use, but still ok for
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 * internal use.
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 */
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#include "internal/deprecated.h"
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#include <openssl/cast.h>
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#include "cast_local.h"
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void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
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0
{
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0
    CAST_LONG l, r, t;
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0
    const CAST_LONG *k;
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0
    k = &(key->data[0]);
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0
    l = data[0];
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0
    r = data[1];
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0
    E_CAST(0, k, l, r, +, ^, -);
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0
    E_CAST(1, k, r, l, ^, -, +);
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0
    E_CAST(2, k, l, r, -, +, ^);
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0
    E_CAST(3, k, r, l, +, ^, -);
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0
    E_CAST(4, k, l, r, ^, -, +);
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0
    E_CAST(5, k, r, l, -, +, ^);
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0
    E_CAST(6, k, l, r, +, ^, -);
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0
    E_CAST(7, k, r, l, ^, -, +);
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0
    E_CAST(8, k, l, r, -, +, ^);
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0
    E_CAST(9, k, r, l, +, ^, -);
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0
    E_CAST(10, k, l, r, ^, -, +);
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0
    E_CAST(11, k, r, l, -, +, ^);
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0
    if (!key->short_key) {
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0
        E_CAST(12, k, l, r, +, ^, -);
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0
        E_CAST(13, k, r, l, ^, -, +);
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0
        E_CAST(14, k, l, r, -, +, ^);
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0
        E_CAST(15, k, r, l, +, ^, -);
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0
    }
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0
    data[1] = l & 0xffffffffL;
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0
    data[0] = r & 0xffffffffL;
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0
}
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void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
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0
{
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0
    CAST_LONG l, r, t;
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0
    const CAST_LONG *k;
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0
    k = &(key->data[0]);
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0
    l = data[0];
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0
    r = data[1];
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0
    if (!key->short_key) {
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0
        E_CAST(15, k, l, r, +, ^, -);
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0
        E_CAST(14, k, r, l, -, +, ^);
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        E_CAST(13, k, l, r, ^, -, +);
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0
        E_CAST(12, k, r, l, +, ^, -);
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0
    }
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0
    E_CAST(11, k, l, r, -, +, ^);
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0
    E_CAST(10, k, r, l, ^, -, +);
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0
    E_CAST(9, k, l, r, +, ^, -);
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0
    E_CAST(8, k, r, l, -, +, ^);
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0
    E_CAST(7, k, l, r, ^, -, +);
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0
    E_CAST(6, k, r, l, +, ^, -);
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0
    E_CAST(5, k, l, r, -, +, ^);
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0
    E_CAST(4, k, r, l, ^, -, +);
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0
    E_CAST(3, k, l, r, +, ^, -);
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0
    E_CAST(2, k, r, l, -, +, ^);
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0
    E_CAST(1, k, l, r, ^, -, +);
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0
    E_CAST(0, k, r, l, +, ^, -);
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0
    data[1] = l & 0xffffffffL;
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0
    data[0] = r & 0xffffffffL;
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0
}
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void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
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                      long length, const CAST_KEY *ks, unsigned char *iv,
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                      int enc)
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0
{
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0
    register CAST_LONG tin0, tin1;
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    register CAST_LONG tout0, tout1, xor0, xor1;
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    register long l = length;
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0
    CAST_LONG tin[2];
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    if (enc) {
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        n2l(iv, tout0);
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0
        n2l(iv, tout1);
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0
        iv -= 8;
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0
        for (l -= 8; l >= 0; l -= 8) {
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0
            n2l(in, tin0);
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0
            n2l(in, tin1);
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            tin0 ^= tout0;
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0
            tin1 ^= tout1;
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0
            tin[0] = tin0;
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            tin[1] = tin1;
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0
            CAST_encrypt(tin, ks);
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0
            tout0 = tin[0];
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0
            tout1 = tin[1];
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0
            l2n(tout0, out);
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0
            l2n(tout1, out);
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0
        }
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0
        if (l != -8) {
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0
            n2ln(in, tin0, tin1, l + 8);
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0
            tin0 ^= tout0;
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0
            tin1 ^= tout1;
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0
            tin[0] = tin0;
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0
            tin[1] = tin1;
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0
            CAST_encrypt(tin, ks);
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0
            tout0 = tin[0];
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0
            tout1 = tin[1];
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0
            l2n(tout0, out);
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0
            l2n(tout1, out);
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0
        }
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        l2n(tout0, iv);
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        l2n(tout1, iv);
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0
    } else {
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0
        n2l(iv, xor0);
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0
        n2l(iv, xor1);
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0
        iv -= 8;
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0
        for (l -= 8; l >= 0; l -= 8) {
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0
            n2l(in, tin0);
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0
            n2l(in, tin1);
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            tin[0] = tin0;
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0
            tin[1] = tin1;
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            CAST_decrypt(tin, ks);
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            tout0 = tin[0] ^ xor0;
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0
            tout1 = tin[1] ^ xor1;
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0
            l2n(tout0, out);
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0
            l2n(tout1, out);
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0
            xor0 = tin0;
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0
            xor1 = tin1;
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0
        }
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0
        if (l != -8) {
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0
            n2l(in, tin0);
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0
            n2l(in, tin1);
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0
            tin[0] = tin0;
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0
            tin[1] = tin1;
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0
            CAST_decrypt(tin, ks);
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0
            tout0 = tin[0] ^ xor0;
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0
            tout1 = tin[1] ^ xor1;
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0
            l2nn(tout0, tout1, out, l + 8);
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0
            xor0 = tin0;
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0
            xor1 = tin1;
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0
        }
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0
        l2n(xor0, iv);
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0
        l2n(xor1, iv);
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0
    }
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0
    tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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0
    tin[0] = tin[1] = 0;
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0
}