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>
68 const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
70 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
72 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
73 /* ctx->cipher=NULL; */
77 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
78 const unsigned char *key, const unsigned char *iv, int enc)
81 EVP_CIPHER_CTX_init(ctx);
82 return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
85 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
86 const unsigned char *key, const unsigned char *iv, int enc)
96 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
97 * so this context may already have an ENGINE! Try to avoid releasing
98 * the previous handle, re-querying for an ENGINE, and having a
99 * reinitialisation, when it may all be unecessary. */
100 if (ctx->engine && ctx->cipher && (!cipher ||
101 (cipher && (cipher->nid == ctx->cipher->nid))))
105 /* Ensure a context left lying around from last time is cleared
106 * (the previous check attempted to avoid this if the same
107 * ENGINE and EVP_CIPHER could be used). */
108 EVP_CIPHER_CTX_cleanup(ctx);
110 /* Restore encrypt field: it is zeroed by cleanup */
114 if (!ENGINE_init(impl))
116 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
121 /* Ask if an ENGINE is reserved for this job */
122 impl = ENGINE_get_cipher_engine(cipher->nid);
125 /* There's an ENGINE for this job ... (apparently) */
126 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
129 /* One positive side-effect of US's export
130 * control history, is that we should at least
131 * be able to avoid using US mispellings of
132 * "initialisation"? */
133 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
136 /* We'll use the ENGINE's private cipher definition */
138 /* Store the ENGINE functional reference so we know
139 * 'cipher' came from an ENGINE and we need to release
147 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
148 ctx->key_len = cipher->key_len;
150 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
152 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
154 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
159 else if(!ctx->cipher)
161 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
165 /* we assume block size is a power of 2 in *cryptUpdate */
166 assert(ctx->cipher->block_size == 1
167 || ctx->cipher->block_size == 8
168 || ctx->cipher->block_size == 16);
170 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
171 switch(EVP_CIPHER_CTX_mode(ctx)) {
173 case EVP_CIPH_STREAM_CIPHER:
174 case EVP_CIPH_ECB_MODE:
177 case EVP_CIPH_CFB_MODE:
178 case EVP_CIPH_OFB_MODE:
182 case EVP_CIPH_CBC_MODE:
184 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
185 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
194 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
195 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
199 ctx->block_mask=ctx->cipher->block_size-1;
203 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
204 const unsigned char *in, int inl)
207 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
208 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
211 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
214 return EVP_EncryptFinal_ex(ctx,out,outl);
215 else return EVP_DecryptFinal_ex(ctx,out,outl);
218 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
221 return EVP_EncryptFinal(ctx,out,outl);
222 else return EVP_DecryptFinal(ctx,out,outl);
225 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
226 const unsigned char *key, const unsigned char *iv)
228 return EVP_CipherInit(ctx, cipher, key, iv, 1);
231 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
232 const unsigned char *key, const unsigned char *iv)
234 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
237 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
238 const unsigned char *key, const unsigned char *iv)
240 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, 0);
243 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
244 const unsigned char *key, const unsigned char *iv)
246 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
249 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
250 const unsigned char *in, int inl)
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;
273 memcpy(&(ctx->buf[i]),in,inl);
281 memcpy(&(ctx->buf[i]),in,j);
282 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
295 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
300 memcpy(ctx->buf,&(in[inl]),i);
305 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
308 ret = EVP_EncryptFinal_ex(ctx, out, outl);
312 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
316 b=ctx->cipher->block_size;
323 if (ctx->flags & EVP_CIPH_NO_PADDING)
327 EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
337 ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
346 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
347 const unsigned char *in, int inl)
357 if (ctx->flags & EVP_CIPH_NO_PADDING)
358 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
360 b=ctx->cipher->block_size;
364 memcpy(out,ctx->final,b);
372 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
375 /* if we have 'decrypted' a multiple of block size, make sure
376 * we have a copy of this last block */
377 if (b > 1 && !ctx->buf_len)
381 memcpy(ctx->final,&out[*outl],b);
392 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
395 ret = EVP_DecryptFinal_ex(ctx, out, outl);
399 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
405 b=ctx->cipher->block_size;
406 if (ctx->flags & EVP_CIPH_NO_PADDING)
410 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
418 if (ctx->buf_len || !ctx->final_used)
420 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
426 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
431 if (ctx->final[--b] != n)
433 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
437 n=ctx->cipher->block_size-n;
439 out[i]=ctx->final[i];
447 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
449 if (c->cipher != NULL)
451 if(c->cipher->cleanup && !c->cipher->cleanup(c))
453 /* Zero cipher context data */
455 memset(c->cipher_data, 0, c->cipher->ctx_size);
458 OPENSSL_free(c->cipher_data);
460 /* The EVP_CIPHER we used belongs to an ENGINE, release the
461 * functional reference we held for this reason. */
462 ENGINE_finish(c->engine);
463 memset(c,0,sizeof(EVP_CIPHER_CTX));
467 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
469 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
470 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
471 if(c->key_len == keylen) return 1;
472 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
477 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
481 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
483 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
484 else ctx->flags |= EVP_CIPH_NO_PADDING;
488 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
492 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
496 if(!ctx->cipher->ctrl) {
497 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
501 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
503 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);