[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (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 | #include <openssl/blowfish.h>
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| 11 | #include "bf_locl.h"
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| 12 |
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| 13 | /*
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| 14 | * The input and output encrypted as though 64bit cfb mode is being used.
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| 15 | * The extra state information to record how much of the 64bit block we have
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| 16 | * used is contained in *num;
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| 17 | */
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| 18 |
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| 19 | void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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| 20 | long length, const BF_KEY *schedule,
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| 21 | unsigned char *ivec, int *num, int encrypt)
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| 22 | {
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| 23 | register BF_LONG v0, v1, t;
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| 24 | register int n = *num;
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| 25 | register long l = length;
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| 26 | BF_LONG ti[2];
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| 27 | unsigned char *iv, c, cc;
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| 28 |
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| 29 | iv = (unsigned char *)ivec;
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| 30 | if (encrypt) {
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| 31 | while (l--) {
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| 32 | if (n == 0) {
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| 33 | n2l(iv, v0);
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| 34 | ti[0] = v0;
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| 35 | n2l(iv, v1);
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| 36 | ti[1] = v1;
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| 37 | BF_encrypt((BF_LONG *)ti, schedule);
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| 38 | iv = (unsigned char *)ivec;
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| 39 | t = ti[0];
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| 40 | l2n(t, iv);
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| 41 | t = ti[1];
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| 42 | l2n(t, iv);
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| 43 | iv = (unsigned char *)ivec;
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| 44 | }
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| 45 | c = *(in++) ^ iv[n];
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| 46 | *(out++) = c;
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| 47 | iv[n] = c;
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| 48 | n = (n + 1) & 0x07;
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| 49 | }
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| 50 | } else {
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| 51 | while (l--) {
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| 52 | if (n == 0) {
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| 53 | n2l(iv, v0);
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| 54 | ti[0] = v0;
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| 55 | n2l(iv, v1);
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| 56 | ti[1] = v1;
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| 57 | BF_encrypt((BF_LONG *)ti, schedule);
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| 58 | iv = (unsigned char *)ivec;
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| 59 | t = ti[0];
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| 60 | l2n(t, iv);
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| 61 | t = ti[1];
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| 62 | l2n(t, iv);
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| 63 | iv = (unsigned char *)ivec;
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| 64 | }
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| 65 | cc = *(in++);
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| 66 | c = iv[n];
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| 67 | iv[n] = cc;
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| 68 | *(out++) = c ^ cc;
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| 69 | n = (n + 1) & 0x07;
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| 70 | }
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| 71 | }
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| 72 | v0 = v1 = ti[0] = ti[1] = t = c = cc = 0;
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| 73 | *num = n;
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| 74 | }
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