| 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 <stdio.h>
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| 18 | #include "internal/cryptlib.h"
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| 19 |
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| 20 | #ifndef OPENSSL_NO_IDEA
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| 21 | # include <openssl/evp.h>
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| 22 | # include <openssl/objects.h>
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| 23 | # include "crypto/evp.h"
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| 24 | # include <openssl/idea.h>
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| 25 | # include "evp_local.h"
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| 26 |
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| 27 | /* Can't use IMPLEMENT_BLOCK_CIPHER because IDEA_ecb_encrypt is different */
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| 28 |
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| 29 | typedef struct {
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| 30 | IDEA_KEY_SCHEDULE ks;
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| 31 | } EVP_IDEA_KEY;
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| 32 |
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| 33 | static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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| 34 | const unsigned char *iv, int enc);
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| 35 |
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| 36 | /*
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| 37 | * NB IDEA_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a
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| 38 | * special case
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| 39 | */
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| 40 |
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| 41 | static int idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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| 42 | const unsigned char *in, size_t inl)
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| 43 | {
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| 44 | BLOCK_CIPHER_ecb_loop()
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| 45 | IDEA_ecb_encrypt(in + i, out + i, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
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| 46 | return 1;
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| 47 | }
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| 48 |
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| 49 | BLOCK_CIPHER_func_cbc(idea, IDEA, EVP_IDEA_KEY, ks)
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| 50 | BLOCK_CIPHER_func_ofb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
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| 51 | BLOCK_CIPHER_func_cfb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
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| 52 |
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| 53 | BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,
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| 54 | 0, idea_init_key, NULL,
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| 55 | EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)
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| 56 |
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| 57 | static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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| 58 | const unsigned char *iv, int enc)
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| 59 | {
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| 60 | if (!enc) {
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| 61 | if (EVP_CIPHER_CTX_get_mode(ctx) == EVP_CIPH_OFB_MODE)
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| 62 | enc = 1;
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| 63 | else if (EVP_CIPHER_CTX_get_mode(ctx) == EVP_CIPH_CFB_MODE)
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| 64 | enc = 1;
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| 65 | }
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| 66 | if (enc)
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| 67 | IDEA_set_encrypt_key(key, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
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| 68 | else {
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| 69 | IDEA_KEY_SCHEDULE tmp;
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| 70 |
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| 71 | IDEA_set_encrypt_key(key, &tmp);
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| 72 | IDEA_set_decrypt_key(&tmp, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
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| 73 | OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));
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| 74 | }
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| 75 | return 1;
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| 76 | }
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| 77 |
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| 78 | #endif
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