| 1 | /*
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| 2 | * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * IDEA low level APIs are deprecated for public use, but still ok for internal
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| 12 | * use where we're using them to implement the higher level EVP interface, as is
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| 13 | * the case here.
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| 14 | */
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| 15 | #include "internal/deprecated.h"
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| 16 |
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| 17 | #include <openssl/idea.h>
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| 18 | #include "idea_local.h"
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| 19 |
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| 20 | /*
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| 21 | * The input and output encrypted as though 64bit cfb mode is being used.
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| 22 | * The extra state information to record how much of the 64bit block we have
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| 23 | * used is contained in *num;
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| 24 | */
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| 25 |
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| 26 | void IDEA_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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| 27 | long length, IDEA_KEY_SCHEDULE *schedule,
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| 28 | unsigned char *ivec, int *num, int encrypt)
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| 29 | {
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| 30 | register unsigned long v0, v1, t;
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| 31 | register int n = *num;
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| 32 | register long l = length;
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| 33 | unsigned long ti[2];
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| 34 | unsigned char *iv, c, cc;
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| 35 |
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| 36 | if (n < 0) {
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| 37 | *num = -1;
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| 38 | return;
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| 39 | }
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| 40 |
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| 41 | iv = (unsigned char *)ivec;
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| 42 | if (encrypt) {
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| 43 | while (l--) {
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| 44 | if (n == 0) {
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| 45 | n2l(iv, v0);
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| 46 | ti[0] = v0;
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| 47 | n2l(iv, v1);
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| 48 | ti[1] = v1;
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| 49 | IDEA_encrypt((unsigned long *)ti, schedule);
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| 50 | iv = (unsigned char *)ivec;
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| 51 | t = ti[0];
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| 52 | l2n(t, iv);
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| 53 | t = ti[1];
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| 54 | l2n(t, iv);
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| 55 | iv = (unsigned char *)ivec;
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| 56 | }
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| 57 | c = *(in++) ^ iv[n];
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| 58 | *(out++) = c;
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| 59 | iv[n] = c;
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| 60 | n = (n + 1) & 0x07;
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| 61 | }
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| 62 | } else {
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| 63 | while (l--) {
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| 64 | if (n == 0) {
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| 65 | n2l(iv, v0);
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| 66 | ti[0] = v0;
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| 67 | n2l(iv, v1);
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| 68 | ti[1] = v1;
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| 69 | IDEA_encrypt((unsigned long *)ti, schedule);
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| 70 | iv = (unsigned char *)ivec;
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| 71 | t = ti[0];
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| 72 | l2n(t, iv);
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| 73 | t = ti[1];
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| 74 | l2n(t, iv);
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| 75 | iv = (unsigned char *)ivec;
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| 76 | }
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| 77 | cc = *(in++);
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| 78 | c = iv[n];
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| 79 | iv[n] = cc;
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| 80 | *(out++) = c ^ cc;
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| 81 | n = (n + 1) & 0x07;
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| 82 | }
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| 83 | }
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| 84 | v0 = v1 = ti[0] = ti[1] = t = c = cc = 0;
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| 85 | *num = n;
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| 86 | }
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