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.]
61 #include <openssl/evp.h>
62 #include <openssl/err.h>
63 #include <openssl/rand.h>
64 #ifndef OPENSSL_NO_ENGINE
65 #include <openssl/engine.h>
69 const char *EVP_version
="EVP" OPENSSL_VERSION_PTEXT
;
71 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX
*ctx
)
73 memset(ctx
,0,sizeof(EVP_CIPHER_CTX
));
74 /* ctx->cipher=NULL; */
78 int EVP_CipherInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
79 const unsigned char *key
, const unsigned char *iv
, int enc
)
82 EVP_CIPHER_CTX_init(ctx
);
83 return EVP_CipherInit_ex(ctx
,cipher
,NULL
,key
,iv
,enc
);
86 int EVP_CipherInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
, ENGINE
*impl
,
87 const unsigned char *key
, const unsigned char *iv
, int enc
)
97 #ifndef OPENSSL_NO_ENGINE
98 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
99 * so this context may already have an ENGINE! Try to avoid releasing
100 * the previous handle, re-querying for an ENGINE, and having a
101 * reinitialisation, when it may all be unecessary. */
102 if (ctx
->engine
&& ctx
->cipher
&& (!cipher
||
103 (cipher
&& (cipher
->nid
== ctx
->cipher
->nid
))))
108 /* Ensure a context left lying around from last time is cleared
109 * (the previous check attempted to avoid this if the same
110 * ENGINE and EVP_CIPHER could be used). */
111 EVP_CIPHER_CTX_cleanup(ctx
);
113 /* Restore encrypt field: it is zeroed by cleanup */
115 #ifndef OPENSSL_NO_ENGINE
118 if (!ENGINE_init(impl
))
120 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
125 /* Ask if an ENGINE is reserved for this job */
126 impl
= ENGINE_get_cipher_engine(cipher
->nid
);
129 /* There's an ENGINE for this job ... (apparently) */
130 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, cipher
->nid
);
133 /* One positive side-effect of US's export
134 * control history, is that we should at least
135 * be able to avoid using US mispellings of
136 * "initialisation"? */
137 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
140 /* We'll use the ENGINE's private cipher definition */
142 /* Store the ENGINE functional reference so we know
143 * 'cipher' came from an ENGINE and we need to release
152 if (ctx
->cipher
->ctx_size
)
154 ctx
->cipher_data
=OPENSSL_malloc(ctx
->cipher
->ctx_size
);
155 if (!ctx
->cipher_data
)
157 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
163 ctx
->cipher_data
= NULL
;
165 ctx
->key_len
= cipher
->key_len
;
167 if(ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
)
169 if(!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
))
171 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
176 else if(!ctx
->cipher
)
178 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_NO_CIPHER_SET
);
181 #ifndef OPENSSL_NO_ENGINE
184 /* we assume block size is a power of 2 in *cryptUpdate */
185 OPENSSL_assert(ctx
->cipher
->block_size
== 1
186 || ctx
->cipher
->block_size
== 8
187 || ctx
->cipher
->block_size
== 16);
189 if(!(EVP_CIPHER_CTX_flags(ctx
) & EVP_CIPH_CUSTOM_IV
)) {
190 switch(EVP_CIPHER_CTX_mode(ctx
)) {
192 case EVP_CIPH_STREAM_CIPHER
:
193 case EVP_CIPH_ECB_MODE
:
196 case EVP_CIPH_CFB_MODE
:
197 case EVP_CIPH_OFB_MODE
:
201 case EVP_CIPH_CBC_MODE
:
203 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
204 (int)sizeof(ctx
->iv
));
205 if(iv
) memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
206 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
215 if(key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
216 if(!ctx
->cipher
->init(ctx
,key
,iv
,enc
)) return 0;
220 ctx
->block_mask
=ctx
->cipher
->block_size
-1;
224 int EVP_CipherUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
225 const unsigned char *in
, int inl
)
228 return EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
);
229 else return EVP_DecryptUpdate(ctx
,out
,outl
,in
,inl
);
232 int EVP_CipherFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
235 return EVP_EncryptFinal_ex(ctx
,out
,outl
);
236 else return EVP_DecryptFinal_ex(ctx
,out
,outl
);
239 int EVP_CipherFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
242 return EVP_EncryptFinal(ctx
,out
,outl
);
243 else return EVP_DecryptFinal(ctx
,out
,outl
);
246 int EVP_EncryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
247 const unsigned char *key
, const unsigned char *iv
)
249 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 1);
252 int EVP_EncryptInit_ex(EVP_CIPHER_CTX
*ctx
,const EVP_CIPHER
*cipher
, ENGINE
*impl
,
253 const unsigned char *key
, const unsigned char *iv
)
255 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 1);
258 int EVP_DecryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
259 const unsigned char *key
, const unsigned char *iv
)
261 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 0);
264 int EVP_DecryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
, ENGINE
*impl
,
265 const unsigned char *key
, const unsigned char *iv
)
267 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 0);
270 int EVP_EncryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
271 const unsigned char *in
, int inl
)
275 OPENSSL_assert(inl
> 0);
276 if(ctx
->buf_len
== 0 && (inl
&(ctx
->block_mask
)) == 0)
278 if(ctx
->cipher
->do_cipher(ctx
,out
,in
,inl
))
290 bl
=ctx
->cipher
->block_size
;
291 OPENSSL_assert(bl
<= (int)sizeof(ctx
->buf
));
296 memcpy(&(ctx
->buf
[i
]),in
,inl
);
304 memcpy(&(ctx
->buf
[i
]),in
,j
);
305 if(!ctx
->cipher
->do_cipher(ctx
,out
,ctx
->buf
,bl
)) return 0;
318 if(!ctx
->cipher
->do_cipher(ctx
,out
,in
,inl
)) return 0;
323 memcpy(ctx
->buf
,&(in
[inl
]),i
);
328 int EVP_EncryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
331 ret
= EVP_EncryptFinal_ex(ctx
, out
, outl
);
335 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
338 unsigned int i
, b
, bl
;
340 b
=ctx
->cipher
->block_size
;
341 OPENSSL_assert(b
<= sizeof ctx
->buf
);
348 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
352 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
362 ret
=ctx
->cipher
->do_cipher(ctx
,out
,ctx
->buf
,b
);
371 int EVP_DecryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
372 const unsigned char *in
, int inl
)
383 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
384 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
386 b
=ctx
->cipher
->block_size
;
387 OPENSSL_assert(b
<= sizeof ctx
->final
);
391 memcpy(out
,ctx
->final
,b
);
399 if(!EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
))
402 /* if we have 'decrypted' a multiple of block size, make sure
403 * we have a copy of this last block */
404 if (b
> 1 && !ctx
->buf_len
)
408 memcpy(ctx
->final
,&out
[*outl
],b
);
419 int EVP_DecryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
422 ret
= EVP_DecryptFinal_ex(ctx
, out
, outl
);
426 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
432 b
=ctx
->cipher
->block_size
;
433 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
437 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
445 if (ctx
->buf_len
|| !ctx
->final_used
)
447 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
450 OPENSSL_assert(b
<= sizeof ctx
->final
);
452 if (n
== 0 || n
> (int)b
)
454 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_BAD_DECRYPT
);
459 if (ctx
->final
[--b
] != n
)
461 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_BAD_DECRYPT
);
465 n
=ctx
->cipher
->block_size
-n
;
467 out
[i
]=ctx
->final
[i
];
475 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX
*c
)
477 if (c
->cipher
!= NULL
)
479 if(c
->cipher
->cleanup
&& !c
->cipher
->cleanup(c
))
481 /* Cleanse cipher context data */
483 OPENSSL_cleanse(c
->cipher_data
, c
->cipher
->ctx_size
);
486 OPENSSL_free(c
->cipher_data
);
487 #ifndef OPENSSL_NO_ENGINE
489 /* The EVP_CIPHER we used belongs to an ENGINE, release the
490 * functional reference we held for this reason. */
491 ENGINE_finish(c
->engine
);
493 memset(c
,0,sizeof(EVP_CIPHER_CTX
));
497 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX
*c
, int keylen
)
499 if(c
->cipher
->flags
& EVP_CIPH_CUSTOM_KEY_LENGTH
)
500 return EVP_CIPHER_CTX_ctrl(c
, EVP_CTRL_SET_KEY_LENGTH
, keylen
, NULL
);
501 if(c
->key_len
== keylen
) return 1;
502 if((keylen
> 0) && (c
->cipher
->flags
& EVP_CIPH_VARIABLE_LENGTH
))
507 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH
,EVP_R_INVALID_KEY_LENGTH
);
511 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX
*ctx
, int pad
)
513 if (pad
) ctx
->flags
&= ~EVP_CIPH_NO_PADDING
;
514 else ctx
->flags
|= EVP_CIPH_NO_PADDING
;
518 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
522 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
526 if(!ctx
->cipher
->ctrl
) {
527 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
531 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
533 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
539 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX
*ctx
, unsigned char *key
)
541 if (ctx
->cipher
->flags
& EVP_CIPH_RAND_KEY
)
542 return EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_RAND_KEY
, 0, key
);
543 if (RAND_bytes(key
, ctx
->key_len
) <= 0)