363 lines
10 KiB
C
363 lines
10 KiB
C
// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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// SPDX-License-Identifier: Apache-2.0
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#include <openssl/cipher.h>
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#include <openssl/obj.h>
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#if defined(OPENSSL_WINDOWS)
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OPENSSL_MSVC_PRAGMA(warning(push, 3))
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#include <intrin.h>
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OPENSSL_MSVC_PRAGMA(warning(pop))
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#endif
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#include "../../../crypto/internal.h"
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#include "../../fipsmodule/cipher/internal.h"
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#include "../macros.h"
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#include "internal.h"
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void CAST_ecb_encrypt(const uint8_t *in, uint8_t *out, const CAST_KEY *ks,
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int enc) {
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uint32_t d[2];
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n2l(in, d[0]);
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n2l(in, d[1]);
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if (enc) {
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CAST_encrypt(d, ks);
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} else {
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CAST_decrypt(d, ks);
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}
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l2n(d[0], out);
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l2n(d[1], out);
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}
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#if defined(OPENSSL_WINDOWS) && defined(_MSC_VER)
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#define ROTL(a, n) (_lrotl(a, n))
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#else
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#define ROTL(a, n) ((((a) << (n)) | ((a) >> ((-(n))&31))) & 0xffffffffL)
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#endif
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#define E_CAST(n, key, L, R, OP1, OP2, OP3) \
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{ \
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uint32_t a, b, c, d; \
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t = (key[n * 2] OP1 R) & 0xffffffff; \
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t = ROTL(t, (key[n * 2 + 1])); \
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a = CAST_S_table0[(t >> 8) & 0xff]; \
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b = CAST_S_table1[(t)&0xff]; \
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c = CAST_S_table2[(t >> 24) & 0xff]; \
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d = CAST_S_table3[(t >> 16) & 0xff]; \
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L ^= (((((a OP2 b)&0xffffffffL)OP3 c) & 0xffffffffL)OP1 d) & 0xffffffffL; \
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}
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void CAST_encrypt(uint32_t *data, const CAST_KEY *key) {
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uint32_t l, r, t;
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const uint32_t *k;
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k = &key->data[0];
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l = data[0];
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r = data[1];
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E_CAST(0, k, l, r, +, ^, -);
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E_CAST(1, k, r, l, ^, -, +);
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E_CAST(2, k, l, r, -, +, ^);
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E_CAST(3, k, r, l, +, ^, -);
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E_CAST(4, k, l, r, ^, -, +);
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E_CAST(5, k, r, l, -, +, ^);
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E_CAST(6, k, l, r, +, ^, -);
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E_CAST(7, k, r, l, ^, -, +);
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E_CAST(8, k, l, r, -, +, ^);
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E_CAST(9, k, r, l, +, ^, -);
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E_CAST(10, k, l, r, ^, -, +);
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E_CAST(11, k, r, l, -, +, ^);
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if (!key->short_key) {
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E_CAST(12, k, l, r, +, ^, -);
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E_CAST(13, k, r, l, ^, -, +);
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E_CAST(14, k, l, r, -, +, ^);
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E_CAST(15, k, r, l, +, ^, -);
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}
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data[1] = l & 0xffffffffL;
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data[0] = r & 0xffffffffL;
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}
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void CAST_decrypt(uint32_t *data, const CAST_KEY *key) {
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uint32_t l, r, t;
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const uint32_t *k;
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k = &key->data[0];
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l = data[0];
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r = data[1];
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if (!key->short_key) {
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E_CAST(15, k, l, r, +, ^, -);
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E_CAST(14, k, r, l, -, +, ^);
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E_CAST(13, k, l, r, ^, -, +);
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E_CAST(12, k, r, l, +, ^, -);
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}
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E_CAST(11, k, l, r, -, +, ^);
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E_CAST(10, k, r, l, ^, -, +);
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E_CAST(9, k, l, r, +, ^, -);
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E_CAST(8, k, r, l, -, +, ^);
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E_CAST(7, k, l, r, ^, -, +);
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E_CAST(6, k, r, l, +, ^, -);
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E_CAST(5, k, l, r, -, +, ^);
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E_CAST(4, k, r, l, ^, -, +);
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E_CAST(3, k, l, r, +, ^, -);
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E_CAST(2, k, r, l, -, +, ^);
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E_CAST(1, k, l, r, ^, -, +);
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E_CAST(0, k, r, l, +, ^, -);
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data[1] = l & 0xffffffffL;
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data[0] = r & 0xffffffffL;
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}
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void CAST_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
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const CAST_KEY *ks, uint8_t *iv, int enc) {
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uint32_t tin0, tin1;
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uint32_t tout0, tout1, xor0, xor1;
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size_t l = length;
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uint32_t tin[2];
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if (enc) {
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n2l(iv, tout0);
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n2l(iv, tout1);
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iv -= 8;
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while (l >= 8) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin0 ^= tout0;
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tin1 ^= tout1;
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tin[0] = tin0;
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tin[1] = tin1;
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CAST_encrypt(tin, ks);
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tout0 = tin[0];
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tout1 = tin[1];
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l2n(tout0, out);
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l2n(tout1, out);
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l -= 8;
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}
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if (l != 0) {
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n2ln(in, tin0, tin1, l);
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tin0 ^= tout0;
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tin1 ^= tout1;
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tin[0] = tin0;
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tin[1] = tin1;
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CAST_encrypt(tin, ks);
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tout0 = tin[0];
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tout1 = tin[1];
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l2n(tout0, out);
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l2n(tout1, out);
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}
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l2n(tout0, iv);
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l2n(tout1, iv);
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} else {
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n2l(iv, xor0);
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n2l(iv, xor1);
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iv -= 8;
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while (l >= 8) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin[0] = tin0;
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tin[1] = tin1;
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CAST_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2n(tout0, out);
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l2n(tout1, out);
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xor0 = tin0;
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xor1 = tin1;
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l -= 8;
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}
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if (l != 0) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin[0] = tin0;
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tin[1] = tin1;
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CAST_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2nn(tout0, tout1, out, l);
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xor0 = tin0;
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xor1 = tin1;
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}
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l2n(xor0, iv);
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l2n(xor1, iv);
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}
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OPENSSL_cleanse(&tin0, sizeof(tin0));
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OPENSSL_cleanse(&tin1, sizeof(tin1));
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OPENSSL_cleanse(&tout0, sizeof(tout0));
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OPENSSL_cleanse(&tout1, sizeof(tout1));
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OPENSSL_cleanse(&xor0, sizeof(xor0));
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OPENSSL_cleanse(&xor1, sizeof(xor1));
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OPENSSL_cleanse(&tin, sizeof(tin));
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}
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#define CAST_exp(l, A, a, n) \
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A[n / 4] = l; \
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a[n + 3] = (l)&0xff; \
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a[n + 2] = (l >> 8) & 0xff; \
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a[n + 1] = (l >> 16) & 0xff; \
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a[n + 0] = (l >> 24) & 0xff;
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#define S4 CAST_S_table4
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#define S5 CAST_S_table5
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#define S6 CAST_S_table6
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#define S7 CAST_S_table7
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void CAST_set_key(CAST_KEY *key, size_t len, const uint8_t *data) {
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uint32_t x[16];
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uint32_t z[16];
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uint32_t k[32];
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uint32_t X[4], Z[4];
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uint32_t l, *K;
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size_t i;
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for (i = 0; i < 16; i++) {
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x[i] = 0;
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}
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if (len > 16) {
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len = 16;
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}
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for (i = 0; i < len; i++) {
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x[i] = data[i];
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}
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if (len <= 10) {
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key->short_key = 1;
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} else {
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key->short_key = 0;
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}
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K = &k[0];
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X[0] = ((x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3]) & 0xffffffffL;
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X[1] = ((x[4] << 24) | (x[5] << 16) | (x[6] << 8) | x[7]) & 0xffffffffL;
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X[2] = ((x[8] << 24) | (x[9] << 16) | (x[10] << 8) | x[11]) & 0xffffffffL;
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X[3] = ((x[12] << 24) | (x[13] << 16) | (x[14] << 8) | x[15]) & 0xffffffffL;
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for (;;) {
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l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]];
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CAST_exp(l, Z, z, 0);
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l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]];
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CAST_exp(l, Z, z, 4);
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l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]];
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CAST_exp(l, Z, z, 8);
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l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]];
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CAST_exp(l, Z, z, 12);
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K[0] = S4[z[8]] ^ S5[z[9]] ^ S6[z[7]] ^ S7[z[6]] ^ S4[z[2]];
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K[1] = S4[z[10]] ^ S5[z[11]] ^ S6[z[5]] ^ S7[z[4]] ^ S5[z[6]];
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K[2] = S4[z[12]] ^ S5[z[13]] ^ S6[z[3]] ^ S7[z[2]] ^ S6[z[9]];
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K[3] = S4[z[14]] ^ S5[z[15]] ^ S6[z[1]] ^ S7[z[0]] ^ S7[z[12]];
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l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]];
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CAST_exp(l, X, x, 0);
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l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]];
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CAST_exp(l, X, x, 4);
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l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]];
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CAST_exp(l, X, x, 8);
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l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]];
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CAST_exp(l, X, x, 12);
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K[4] = S4[x[3]] ^ S5[x[2]] ^ S6[x[12]] ^ S7[x[13]] ^ S4[x[8]];
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K[5] = S4[x[1]] ^ S5[x[0]] ^ S6[x[14]] ^ S7[x[15]] ^ S5[x[13]];
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K[6] = S4[x[7]] ^ S5[x[6]] ^ S6[x[8]] ^ S7[x[9]] ^ S6[x[3]];
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K[7] = S4[x[5]] ^ S5[x[4]] ^ S6[x[10]] ^ S7[x[11]] ^ S7[x[7]];
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l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]];
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CAST_exp(l, Z, z, 0);
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l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]];
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CAST_exp(l, Z, z, 4);
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l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]];
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CAST_exp(l, Z, z, 8);
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l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]];
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CAST_exp(l, Z, z, 12);
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K[8] = S4[z[3]] ^ S5[z[2]] ^ S6[z[12]] ^ S7[z[13]] ^ S4[z[9]];
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K[9] = S4[z[1]] ^ S5[z[0]] ^ S6[z[14]] ^ S7[z[15]] ^ S5[z[12]];
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K[10] = S4[z[7]] ^ S5[z[6]] ^ S6[z[8]] ^ S7[z[9]] ^ S6[z[2]];
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K[11] = S4[z[5]] ^ S5[z[4]] ^ S6[z[10]] ^ S7[z[11]] ^ S7[z[6]];
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l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]];
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CAST_exp(l, X, x, 0);
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l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]];
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CAST_exp(l, X, x, 4);
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l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]];
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CAST_exp(l, X, x, 8);
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l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]];
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CAST_exp(l, X, x, 12);
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K[12] = S4[x[8]] ^ S5[x[9]] ^ S6[x[7]] ^ S7[x[6]] ^ S4[x[3]];
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K[13] = S4[x[10]] ^ S5[x[11]] ^ S6[x[5]] ^ S7[x[4]] ^ S5[x[7]];
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K[14] = S4[x[12]] ^ S5[x[13]] ^ S6[x[3]] ^ S7[x[2]] ^ S6[x[8]];
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K[15] = S4[x[14]] ^ S5[x[15]] ^ S6[x[1]] ^ S7[x[0]] ^ S7[x[13]];
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if (K != k) {
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break;
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}
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K += 16;
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}
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for (i = 0; i < 16; i++) {
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key->data[i * 2] = k[i];
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key->data[i * 2 + 1] = ((k[i + 16]) + 16) & 0x1f;
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}
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}
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static int cast_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
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const uint8_t *iv, int enc) {
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CAST_KEY *cast_key = ctx->cipher_data;
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CAST_set_key(cast_key, ctx->key_len, key);
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return 1;
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}
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static int cast_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
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size_t len) {
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CAST_KEY *cast_key = ctx->cipher_data;
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assert(len % CAST_BLOCK == 0);
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while (len >= CAST_BLOCK) {
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CAST_ecb_encrypt(in, out, cast_key, ctx->encrypt);
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in += CAST_BLOCK;
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out += CAST_BLOCK;
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len -= CAST_BLOCK;
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}
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assert(len == 0);
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return 1;
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}
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static int cast_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
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size_t len) {
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CAST_KEY *cast_key = ctx->cipher_data;
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CAST_cbc_encrypt(in, out, len, cast_key, ctx->iv, ctx->encrypt);
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return 1;
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}
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static const EVP_CIPHER cast5_ecb = {
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.nid = NID_cast5_ecb,
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.block_size = CAST_BLOCK,
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.key_len = CAST_KEY_LENGTH,
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.iv_len = CAST_BLOCK,
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.ctx_size = sizeof(CAST_KEY),
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.flags = EVP_CIPH_ECB_MODE | EVP_CIPH_VARIABLE_LENGTH,
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.init = cast_init_key,
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.cipher = cast_ecb_cipher,
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};
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static const EVP_CIPHER cast5_cbc = {
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.nid = NID_cast5_cbc,
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.block_size = CAST_BLOCK,
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.key_len = CAST_KEY_LENGTH,
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.iv_len = CAST_BLOCK,
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.ctx_size = sizeof(CAST_KEY),
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.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH,
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.init = cast_init_key,
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.cipher = cast_cbc_cipher,
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};
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const EVP_CIPHER *EVP_cast5_ecb(void) { return &cast5_ecb; }
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const EVP_CIPHER *EVP_cast5_cbc(void) { return &cast5_cbc; }
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