1 /* crypto/evp/evp_enc.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 const char *EVP_version
="EVP" OPENSSL_VERSION_PTEXT
;
65 void EVP_CIPHER_CTX_init(ctx
)
68 memset(ctx
,0,sizeof(EVP_CIPHER_CTX
));
69 /* ctx->cipher=NULL; */
72 void EVP_CipherInit(ctx
,data
,key
,iv
,enc
)
74 const EVP_CIPHER
*data
;
80 EVP_EncryptInit(ctx
,data
,key
,iv
);
82 EVP_DecryptInit(ctx
,data
,key
,iv
);
85 void EVP_CipherUpdate(ctx
,out
,outl
,in
,inl
)
93 EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
);
94 else EVP_DecryptUpdate(ctx
,out
,outl
,in
,inl
);
97 int EVP_CipherFinal(ctx
,out
,outl
)
104 EVP_EncryptFinal(ctx
,out
,outl
);
107 else return(EVP_DecryptFinal(ctx
,out
,outl
));
110 void EVP_EncryptInit(ctx
,cipher
,key
,iv
)
112 const EVP_CIPHER
*cipher
;
118 ctx
->cipher
->init(ctx
,key
,iv
,1);
123 void EVP_DecryptInit(ctx
,cipher
,key
,iv
)
125 const EVP_CIPHER
*cipher
;
131 ctx
->cipher
->init(ctx
,key
,iv
,0);
137 void EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
)
147 bl
=ctx
->cipher
->block_size
;
149 if ((inl
== 0) && (i
!= bl
)) return;
154 memcpy(&(ctx
->buf
[i
]),in
,inl
);
161 if (j
!= 0) memcpy(&(ctx
->buf
[i
]),in
,j
);
162 ctx
->cipher
->do_cipher(ctx
,out
,ctx
->buf
,bl
);
169 i
=inl
%bl
; /* how much is left */
173 ctx
->cipher
->do_cipher(ctx
,out
,in
,inl
);
178 memcpy(ctx
->buf
,&(in
[inl
]),i
);
182 void EVP_EncryptFinal(ctx
,out
,outl
)
189 b
=ctx
->cipher
->block_size
;
199 ctx
->cipher
->do_cipher(ctx
,out
,ctx
->buf
,b
);
203 void EVP_DecryptUpdate(ctx
,out
,outl
,in
,inl
)
214 if (inl
== 0) return;
216 b
=ctx
->cipher
->block_size
;
219 /* Is the input a multiple of the block size? */
224 if (inl
< b
) /* must be 'just one' buff */
226 memcpy(&(ctx
->buf
[bl
]),in
,inl
);
232 inl
-=b
; /* don't do the last block */
235 EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
);
237 /* if we have 'decrypted' a multiple of block size, make sure
238 * we have a copy of this last block */
241 memcpy(&(ctx
->buf
[0]),&(in
[inl
]),b
);
243 if (ctx
->buf_len
!= 0)
252 int EVP_DecryptFinal(ctx
,out
,outl
)
261 b
=ctx
->cipher
->block_size
;
264 if (ctx
->buf_len
!= b
)
266 EVPerr(EVP_F_EVP_DECRYPTFINAL
,EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
269 EVP_EncryptUpdate(ctx
,ctx
->buf
,&n
,ctx
->buf
,0);
275 EVPerr(EVP_F_EVP_DECRYPTFINAL
,EVP_R_BAD_DECRYPT
);
280 if (ctx
->buf
[--b
] != n
)
282 EVPerr(EVP_F_EVP_DECRYPTFINAL
,EVP_R_BAD_DECRYPT
);
286 n
=ctx
->cipher
->block_size
-n
;
296 void EVP_CIPHER_CTX_cleanup(c
)
299 if ((c
->cipher
!= NULL
) && (c
->cipher
->cleanup
!= NULL
))
300 c
->cipher
->cleanup(c
);
301 memset(c
,0,sizeof(EVP_CIPHER_CTX
));