1 /* crypto/evp/e_rc2.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
63 #include <openssl/evp.h>
64 #include <openssl/objects.h>
67 static int rc2_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
68 unsigned char *iv,int enc);
69 static int rc2_meth_to_magic(const EVP_CIPHER *e);
70 static EVP_CIPHER *rc2_magic_to_meth(int i);
71 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
72 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74 IMPLEMENT_BLOCK_CIPHER(rc2, rc2.ks, RC2, rc2, NID_rc2,
77 EVP_CIPH_VARIABLE_LENGTH, rc2_init_key, NULL,
78 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, NULL)
80 #define RC2_40_MAGIC 0xa0
81 #define RC2_64_MAGIC 0x78
82 #define RC2_128_MAGIC 0x3a
84 static EVP_CIPHER r2_64_cbc_cipher=
88 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH,
92 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
93 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)),
94 rc2_set_asn1_type_and_iv,
95 rc2_get_asn1_type_and_iv,
100 static EVP_CIPHER r2_40_cbc_cipher=
104 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH,
108 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
109 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)),
110 rc2_set_asn1_type_and_iv,
111 rc2_get_asn1_type_and_iv,
116 EVP_CIPHER *EVP_rc2_64_cbc(void)
118 return(&r2_64_cbc_cipher);
121 EVP_CIPHER *EVP_rc2_40_cbc(void)
123 return(&r2_40_cbc_cipher);
126 static int rc2_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
127 unsigned char *iv, int enc)
129 RC2_set_key(&(ctx->c.rc2.ks),EVP_CIPHER_CTX_key_length(ctx),
130 key,EVP_CIPHER_key_length(ctx->cipher)*8);
134 static int rc2_meth_to_magic(const EVP_CIPHER *e)
138 i=EVP_CIPHER_key_length(e);
139 if (i == 16) return(RC2_128_MAGIC);
140 else if (i == 8) return(RC2_64_MAGIC);
141 else if (i == 5) return(RC2_40_MAGIC);
145 static EVP_CIPHER *rc2_magic_to_meth(int i)
147 if (i == RC2_128_MAGIC) return(EVP_rc2_cbc());
148 else if (i == RC2_64_MAGIC) return(EVP_rc2_64_cbc());
149 else if (i == RC2_40_MAGIC) return(EVP_rc2_40_cbc());
152 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
157 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
165 l=EVP_CIPHER_CTX_iv_length(c);
166 i=ASN1_TYPE_get_int_octetstring(type,&num,c->oiv,l);
170 memcpy(c->iv,c->oiv,l);
171 e=rc2_magic_to_meth((int)num);
174 if (e != EVP_CIPHER_CTX_cipher(c))
176 EVP_CIPHER_CTX_cipher(c)=e;
177 EVP_CIPHER_CTX_set_key_length(c, EVP_CIPHER_key_length(c));
178 rc2_init_key(c,NULL,NULL,1);
184 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
191 num=rc2_meth_to_magic(EVP_CIPHER_CTX_cipher(c));
192 j=EVP_CIPHER_CTX_iv_length(c);
193 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);