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; */
77 EVP_CIPHER_CTX
*EVP_CIPHER_CTX_new(void)
79 EVP_CIPHER_CTX
*ctx
=OPENSSL_malloc(sizeof *ctx
);
81 EVP_CIPHER_CTX_init(ctx
);
85 int EVP_CipherInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
86 const unsigned char *key
, const unsigned char *iv
, int enc
)
89 EVP_CIPHER_CTX_init(ctx
);
90 return EVP_CipherInit_ex(ctx
,cipher
,NULL
,key
,iv
,enc
);
93 int EVP_CipherInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
, ENGINE
*impl
,
94 const unsigned char *key
, const unsigned char *iv
, int enc
)
104 #ifndef OPENSSL_NO_ENGINE
105 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
106 * so this context may already have an ENGINE! Try to avoid releasing
107 * the previous handle, re-querying for an ENGINE, and having a
108 * reinitialisation, when it may all be unecessary. */
109 if (ctx
->engine
&& ctx
->cipher
&& (!cipher
||
110 (cipher
&& (cipher
->nid
== ctx
->cipher
->nid
))))
115 /* Ensure a context left lying around from last time is cleared
116 * (the previous check attempted to avoid this if the same
117 * ENGINE and EVP_CIPHER could be used). */
118 EVP_CIPHER_CTX_cleanup(ctx
);
120 /* Restore encrypt field: it is zeroed by cleanup */
122 #ifndef OPENSSL_NO_ENGINE
125 if (!ENGINE_init(impl
))
127 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
132 /* Ask if an ENGINE is reserved for this job */
133 impl
= ENGINE_get_cipher_engine(cipher
->nid
);
136 /* There's an ENGINE for this job ... (apparently) */
137 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, cipher
->nid
);
140 /* One positive side-effect of US's export
141 * control history, is that we should at least
142 * be able to avoid using US mispellings of
143 * "initialisation"? */
144 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
147 /* We'll use the ENGINE's private cipher definition */
149 /* Store the ENGINE functional reference so we know
150 * 'cipher' came from an ENGINE and we need to release
159 if (ctx
->cipher
->ctx_size
)
161 ctx
->cipher_data
=OPENSSL_malloc(ctx
->cipher
->ctx_size
);
162 if (!ctx
->cipher_data
)
164 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
170 ctx
->cipher_data
= NULL
;
172 ctx
->key_len
= cipher
->key_len
;
174 if(ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
)
176 if(!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
))
178 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
183 else if(!ctx
->cipher
)
185 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_NO_CIPHER_SET
);
188 #ifndef OPENSSL_NO_ENGINE
191 /* we assume block size is a power of 2 in *cryptUpdate */
192 OPENSSL_assert(ctx
->cipher
->block_size
== 1
193 || ctx
->cipher
->block_size
== 8
194 || ctx
->cipher
->block_size
== 16);
196 if(!(EVP_CIPHER_CTX_flags(ctx
) & EVP_CIPH_CUSTOM_IV
)) {
197 switch(EVP_CIPHER_CTX_mode(ctx
)) {
199 case EVP_CIPH_STREAM_CIPHER
:
200 case EVP_CIPH_ECB_MODE
:
203 case EVP_CIPH_CFB_MODE
:
204 case EVP_CIPH_OFB_MODE
:
209 case EVP_CIPH_CBC_MODE
:
211 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
212 (int)sizeof(ctx
->iv
));
213 if(iv
) memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
214 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
217 case EVP_CIPH_CTR_MODE
:
218 /* Don't reuse IV for CTR mode */
220 memcpy(ctx
->iv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
229 if(key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
230 if(!ctx
->cipher
->init(ctx
,key
,iv
,enc
)) return 0;
234 ctx
->block_mask
=ctx
->cipher
->block_size
-1;
238 int EVP_CipherUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
239 const unsigned char *in
, int inl
)
242 return EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
);
243 else return EVP_DecryptUpdate(ctx
,out
,outl
,in
,inl
);
246 int EVP_CipherFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
249 return EVP_EncryptFinal_ex(ctx
,out
,outl
);
250 else return EVP_DecryptFinal_ex(ctx
,out
,outl
);
253 int EVP_CipherFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
256 return EVP_EncryptFinal(ctx
,out
,outl
);
257 else return EVP_DecryptFinal(ctx
,out
,outl
);
260 int EVP_EncryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
261 const unsigned char *key
, const unsigned char *iv
)
263 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 1);
266 int EVP_EncryptInit_ex(EVP_CIPHER_CTX
*ctx
,const EVP_CIPHER
*cipher
, ENGINE
*impl
,
267 const unsigned char *key
, const unsigned char *iv
)
269 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 1);
272 int EVP_DecryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
273 const unsigned char *key
, const unsigned char *iv
)
275 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 0);
278 int EVP_DecryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
, ENGINE
*impl
,
279 const unsigned char *key
, const unsigned char *iv
)
281 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 0);
284 int EVP_EncryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
285 const unsigned char *in
, int inl
)
295 if(ctx
->buf_len
== 0 && (inl
&(ctx
->block_mask
)) == 0)
297 if(ctx
->cipher
->do_cipher(ctx
,out
,in
,inl
))
309 bl
=ctx
->cipher
->block_size
;
310 OPENSSL_assert(bl
<= (int)sizeof(ctx
->buf
));
315 memcpy(&(ctx
->buf
[i
]),in
,inl
);
323 memcpy(&(ctx
->buf
[i
]),in
,j
);
324 if(!ctx
->cipher
->do_cipher(ctx
,out
,ctx
->buf
,bl
)) return 0;
337 if(!ctx
->cipher
->do_cipher(ctx
,out
,in
,inl
)) return 0;
342 memcpy(ctx
->buf
,&(in
[inl
]),i
);
347 int EVP_EncryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
350 ret
= EVP_EncryptFinal_ex(ctx
, out
, outl
);
354 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
357 unsigned int i
, b
, bl
;
359 b
=ctx
->cipher
->block_size
;
360 OPENSSL_assert(b
<= sizeof ctx
->buf
);
367 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
371 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
381 ret
=ctx
->cipher
->do_cipher(ctx
,out
,ctx
->buf
,b
);
390 int EVP_DecryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
391 const unsigned char *in
, int inl
)
402 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
403 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
405 b
=ctx
->cipher
->block_size
;
406 OPENSSL_assert(b
<= sizeof ctx
->final
);
410 memcpy(out
,ctx
->final
,b
);
418 if(!EVP_EncryptUpdate(ctx
,out
,outl
,in
,inl
))
421 /* if we have 'decrypted' a multiple of block size, make sure
422 * we have a copy of this last block */
423 if (b
> 1 && !ctx
->buf_len
)
427 memcpy(ctx
->final
,&out
[*outl
],b
);
438 int EVP_DecryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
441 ret
= EVP_DecryptFinal_ex(ctx
, out
, outl
);
445 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
451 b
=ctx
->cipher
->block_size
;
452 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
456 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
464 if (ctx
->buf_len
|| !ctx
->final_used
)
466 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
469 OPENSSL_assert(b
<= sizeof ctx
->final
);
471 if (n
== 0 || n
> (int)b
)
473 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_BAD_DECRYPT
);
478 if (ctx
->final
[--b
] != n
)
480 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,EVP_R_BAD_DECRYPT
);
484 n
=ctx
->cipher
->block_size
-n
;
486 out
[i
]=ctx
->final
[i
];
494 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX
*ctx
)
498 EVP_CIPHER_CTX_cleanup(ctx
);
503 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX
*c
)
505 if (c
->cipher
!= NULL
)
507 if(c
->cipher
->cleanup
&& !c
->cipher
->cleanup(c
))
509 /* Cleanse cipher context data */
511 OPENSSL_cleanse(c
->cipher_data
, c
->cipher
->ctx_size
);
514 OPENSSL_free(c
->cipher_data
);
515 #ifndef OPENSSL_NO_ENGINE
517 /* The EVP_CIPHER we used belongs to an ENGINE, release the
518 * functional reference we held for this reason. */
519 ENGINE_finish(c
->engine
);
521 memset(c
,0,sizeof(EVP_CIPHER_CTX
));
525 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX
*c
, int keylen
)
527 if(c
->cipher
->flags
& EVP_CIPH_CUSTOM_KEY_LENGTH
)
528 return EVP_CIPHER_CTX_ctrl(c
, EVP_CTRL_SET_KEY_LENGTH
, keylen
, NULL
);
529 if(c
->key_len
== keylen
) return 1;
530 if((keylen
> 0) && (c
->cipher
->flags
& EVP_CIPH_VARIABLE_LENGTH
))
535 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH
,EVP_R_INVALID_KEY_LENGTH
);
539 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX
*ctx
, int pad
)
541 if (pad
) ctx
->flags
&= ~EVP_CIPH_NO_PADDING
;
542 else ctx
->flags
|= EVP_CIPH_NO_PADDING
;
546 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
550 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
554 if(!ctx
->cipher
->ctrl
) {
555 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
559 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
561 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
567 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX
*ctx
, unsigned char *key
)
569 if (ctx
->cipher
->flags
& EVP_CIPH_RAND_KEY
)
570 return EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_RAND_KEY
, 0, key
);
571 if (RAND_bytes(key
, ctx
->key_len
) <= 0)
576 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX
*out
, const EVP_CIPHER_CTX
*in
)
578 if ((in
== NULL
) || (in
->cipher
== NULL
))
580 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
,EVP_R_INPUT_NOT_INITIALIZED
);
583 #ifndef OPENSSL_NO_ENGINE
584 /* Make sure it's safe to copy a cipher context using an ENGINE */
585 if (in
->engine
&& !ENGINE_init(in
->engine
))
587 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
,ERR_R_ENGINE_LIB
);
592 EVP_CIPHER_CTX_cleanup(out
);
593 memcpy(out
,in
,sizeof *out
);
595 if (in
->cipher_data
&& in
->cipher
->ctx_size
)
597 out
->cipher_data
=OPENSSL_malloc(in
->cipher
->ctx_size
);
598 if (!out
->cipher_data
)
600 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
,ERR_R_MALLOC_FAILURE
);
603 memcpy(out
->cipher_data
,in
->cipher_data
,in
->cipher
->ctx_size
);
606 if (in
->cipher
->flags
& EVP_CIPH_CUSTOM_COPY
)
607 return in
->cipher
->ctrl((EVP_CIPHER_CTX
*)in
, EVP_CTRL_COPY
, 0, out
);