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/engine.h>
66 const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
68 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
70 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
71 /* ctx->cipher=NULL; */
75 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
76 const unsigned char *key, const unsigned char *iv, int enc)
79 EVP_CIPHER_CTX_init(ctx);
80 return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
83 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
84 const unsigned char *key, const unsigned char *iv, int enc)
94 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
95 * so this context may already have an ENGINE! Try to avoid releasing
96 * the previous handle, re-querying for an ENGINE, and having a
97 * reinitialisation, when it may all be unecessary. */
98 if (ctx->engine && ctx->cipher && (!cipher ||
99 (cipher && (cipher->nid == ctx->cipher->nid))))
103 /* Ensure a context left lying around from last time is cleared
104 * (the previous check attempted to avoid this if the same
105 * ENGINE and EVP_CIPHER could be used). */
106 EVP_CIPHER_CTX_cleanup(ctx);
108 /* Restore encrypt field: it is zeroed by cleanup */
112 if (!ENGINE_init(impl))
114 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
119 /* Ask if an ENGINE is reserved for this job */
120 impl = ENGINE_get_cipher_engine(cipher->nid);
123 /* There's an ENGINE for this job ... (apparently) */
124 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
127 /* One positive side-effect of US's export
128 * control history, is that we should at least
129 * be able to avoid using US mispellings of
130 * "initialisation"? */
131 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
134 /* We'll use the ENGINE's private cipher definition */
136 /* Store the ENGINE functional reference so we know
137 * 'cipher' came from an ENGINE and we need to release
145 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
146 ctx->key_len = cipher->key_len;
148 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
150 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
152 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
157 else if(!ctx->cipher)
159 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
163 /* we assume block size is a power of 2 in *cryptUpdate */
164 OPENSSL_assert(ctx->cipher->block_size == 1
165 || ctx->cipher->block_size == 8
166 || ctx->cipher->block_size == 16);
168 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
169 switch(EVP_CIPHER_CTX_mode(ctx)) {
171 case EVP_CIPH_STREAM_CIPHER:
172 case EVP_CIPH_ECB_MODE:
175 case EVP_CIPH_CFB_MODE:
176 case EVP_CIPH_OFB_MODE:
180 case EVP_CIPH_CBC_MODE:
182 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= sizeof ctx->iv);
183 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
184 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
193 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
194 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
198 ctx->block_mask=ctx->cipher->block_size-1;
202 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
203 const unsigned char *in, int inl)
206 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
207 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
210 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
213 return EVP_EncryptFinal_ex(ctx,out,outl);
214 else return EVP_DecryptFinal_ex(ctx,out,outl);
217 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
220 return EVP_EncryptFinal(ctx,out,outl);
221 else return EVP_DecryptFinal(ctx,out,outl);
224 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
225 const unsigned char *key, const unsigned char *iv)
227 return EVP_CipherInit(ctx, cipher, key, iv, 1);
230 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
231 const unsigned char *key, const unsigned char *iv)
233 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
236 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
237 const unsigned char *key, const unsigned char *iv)
239 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, 0);
242 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
243 const unsigned char *key, const unsigned char *iv)
245 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
248 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
249 const unsigned char *in, int inl)
253 OPENSSL_assert(inl > 0);
254 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
256 if(ctx->cipher->do_cipher(ctx,out,in,inl))
268 bl=ctx->cipher->block_size;
269 OPENSSL_assert(bl <= sizeof ctx->buf);
274 memcpy(&(ctx->buf[i]),in,inl);
282 memcpy(&(ctx->buf[i]),in,j);
283 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
296 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
301 memcpy(ctx->buf,&(in[inl]),i);
306 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
309 ret = EVP_EncryptFinal_ex(ctx, out, outl);
313 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
317 b=ctx->cipher->block_size;
318 OPENSSL_assert(b <= sizeof ctx->buf);
325 if (ctx->flags & EVP_CIPH_NO_PADDING)
329 EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
339 ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
348 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
349 const unsigned char *in, int inl)
359 if (ctx->flags & EVP_CIPH_NO_PADDING)
360 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
362 b=ctx->cipher->block_size;
363 OPENSSL_assert(b <= sizeof ctx->final);
367 memcpy(out,ctx->final,b);
375 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
378 /* if we have 'decrypted' a multiple of block size, make sure
379 * we have a copy of this last block */
380 if (b > 1 && !ctx->buf_len)
384 memcpy(ctx->final,&out[*outl],b);
395 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
398 ret = EVP_DecryptFinal_ex(ctx, out, outl);
402 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
408 b=ctx->cipher->block_size;
409 if (ctx->flags & EVP_CIPH_NO_PADDING)
413 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
421 if (ctx->buf_len || !ctx->final_used)
423 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
426 OPENSSL_assert(b <= sizeof ctx->final);
430 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
435 if (ctx->final[--b] != n)
437 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
441 n=ctx->cipher->block_size-n;
443 out[i]=ctx->final[i];
451 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
453 if (c->cipher != NULL)
455 if(c->cipher->cleanup && !c->cipher->cleanup(c))
457 /* Cleanse cipher context data */
459 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
462 OPENSSL_free(c->cipher_data);
464 /* The EVP_CIPHER we used belongs to an ENGINE, release the
465 * functional reference we held for this reason. */
466 ENGINE_finish(c->engine);
467 memset(c,0,sizeof(EVP_CIPHER_CTX));
471 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
473 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
474 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
475 if(c->key_len == keylen) return 1;
476 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
481 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
485 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
487 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
488 else ctx->flags |= EVP_CIPH_NO_PADDING;
492 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
496 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
500 if(!ctx->cipher->ctrl) {
501 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
505 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
507 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);