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);
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)