[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 <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 |
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| 13 | #ifndef OPENSSL_NO_RC2
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| 14 |
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| 15 | # include <openssl/evp.h>
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| 16 | # include <openssl/objects.h>
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| 17 | # include "internal/evp_int.h"
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| 18 | # include <openssl/rc2.h>
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| 19 |
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| 20 | static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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| 21 | const unsigned char *iv, int enc);
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| 22 | static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
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| 23 | static int rc2_magic_to_meth(int i);
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| 24 | static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
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| 25 | static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
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| 26 | static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
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| 27 |
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| 28 | typedef struct {
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| 29 | int key_bits; /* effective key bits */
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| 30 | RC2_KEY ks; /* key schedule */
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| 31 | } EVP_RC2_KEY;
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| 32 |
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| 33 | # define data(ctx) EVP_C_DATA(EVP_RC2_KEY,ctx)
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| 34 |
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| 35 | IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
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| 36 | 8,
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| 37 | RC2_KEY_LENGTH, 8, 64,
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| 38 | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
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| 39 | rc2_init_key, NULL,
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| 40 | rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
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| 41 | rc2_ctrl)
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| 42 | # define RC2_40_MAGIC 0xa0
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| 43 | # define RC2_64_MAGIC 0x78
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| 44 | # define RC2_128_MAGIC 0x3a
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| 45 | static const EVP_CIPHER r2_64_cbc_cipher = {
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| 46 | NID_rc2_64_cbc,
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| 47 | 8, 8 /* 64 bit */ , 8,
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| 48 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
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| 49 | rc2_init_key,
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| 50 | rc2_cbc_cipher,
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| 51 | NULL,
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| 52 | sizeof(EVP_RC2_KEY),
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| 53 | rc2_set_asn1_type_and_iv,
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| 54 | rc2_get_asn1_type_and_iv,
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| 55 | rc2_ctrl,
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| 56 | NULL
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| 57 | };
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| 58 |
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| 59 | static const EVP_CIPHER r2_40_cbc_cipher = {
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| 60 | NID_rc2_40_cbc,
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| 61 | 8, 5 /* 40 bit */ , 8,
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| 62 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
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| 63 | rc2_init_key,
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| 64 | rc2_cbc_cipher,
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| 65 | NULL,
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| 66 | sizeof(EVP_RC2_KEY),
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| 67 | rc2_set_asn1_type_and_iv,
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| 68 | rc2_get_asn1_type_and_iv,
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| 69 | rc2_ctrl,
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| 70 | NULL
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| 71 | };
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| 72 |
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| 73 | const EVP_CIPHER *EVP_rc2_64_cbc(void)
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| 74 | {
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| 75 | return (&r2_64_cbc_cipher);
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| 76 | }
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| 77 |
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| 78 | const EVP_CIPHER *EVP_rc2_40_cbc(void)
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| 79 | {
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| 80 | return (&r2_40_cbc_cipher);
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| 81 | }
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| 82 |
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| 83 | static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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| 84 | const unsigned char *iv, int enc)
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| 85 | {
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| 86 | RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
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| 87 | key, data(ctx)->key_bits);
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| 88 | return 1;
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| 89 | }
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| 90 |
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| 91 | static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
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| 92 | {
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| 93 | int i;
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| 94 |
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| 95 | EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
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| 96 | if (i == 128)
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| 97 | return (RC2_128_MAGIC);
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| 98 | else if (i == 64)
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| 99 | return (RC2_64_MAGIC);
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| 100 | else if (i == 40)
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| 101 | return (RC2_40_MAGIC);
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| 102 | else
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| 103 | return (0);
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| 104 | }
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| 105 |
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| 106 | static int rc2_magic_to_meth(int i)
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| 107 | {
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| 108 | if (i == RC2_128_MAGIC)
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| 109 | return 128;
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| 110 | else if (i == RC2_64_MAGIC)
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| 111 | return 64;
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| 112 | else if (i == RC2_40_MAGIC)
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| 113 | return 40;
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| 114 | else {
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| 115 | EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
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| 116 | return (0);
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
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| 121 | {
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| 122 | long num = 0;
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| 123 | int i = 0;
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| 124 | int key_bits;
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| 125 | unsigned int l;
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| 126 | unsigned char iv[EVP_MAX_IV_LENGTH];
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| 127 |
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| 128 | if (type != NULL) {
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| 129 | l = EVP_CIPHER_CTX_iv_length(c);
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| 130 | OPENSSL_assert(l <= sizeof(iv));
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| 131 | i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
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| 132 | if (i != (int)l)
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| 133 | return -1;
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| 134 | key_bits = rc2_magic_to_meth((int)num);
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| 135 | if (!key_bits)
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| 136 | return -1;
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| 137 | if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
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| 138 | return -1;
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| 139 | EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
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| 140 | if (EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
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| 141 | return -1;
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| 142 | }
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| 143 | return i;
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| 144 | }
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| 145 |
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| 146 | static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
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| 147 | {
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| 148 | long num;
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| 149 | int i = 0, j;
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| 150 |
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| 151 | if (type != NULL) {
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| 152 | num = rc2_meth_to_magic(c);
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| 153 | j = EVP_CIPHER_CTX_iv_length(c);
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| 154 | i = ASN1_TYPE_set_int_octetstring(type, num,
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| 155 | (unsigned char *)EVP_CIPHER_CTX_original_iv(c),
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| 156 | j);
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| 157 | }
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| 158 | return (i);
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| 159 | }
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| 160 |
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| 161 | static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
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| 162 | {
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| 163 | switch (type) {
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| 164 | case EVP_CTRL_INIT:
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| 165 | data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
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| 166 | return 1;
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| 167 |
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| 168 | case EVP_CTRL_GET_RC2_KEY_BITS:
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| 169 | *(int *)ptr = data(c)->key_bits;
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| 170 | return 1;
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| 171 |
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| 172 | case EVP_CTRL_SET_RC2_KEY_BITS:
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| 173 | if (arg > 0) {
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| 174 | data(c)->key_bits = arg;
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| 175 | return 1;
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| 176 | }
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| 177 | return 0;
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| 178 | # ifdef PBE_PRF_TEST
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| 179 | case EVP_CTRL_PBE_PRF_NID:
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| 180 | *(int *)ptr = NID_hmacWithMD5;
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| 181 | return 1;
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| 182 | # endif
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| 183 |
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| 184 | default:
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| 185 | return -1;
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| 186 | }
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| 187 | }
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| 188 |
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| 189 | #endif
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