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 #ifndef OPENSSL_NO_ENGINE
64 #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);
87 /* The purpose of these is to trap programs that attempt to use non FIPS
88 * algorithms in FIPS mode and ignore the errors.
91 int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
92 const unsigned char *iv, int enc)
93 { FIPS_ERROR_IGNORED("Cipher init"); return 0;}
95 int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
96 const unsigned char *in, unsigned int inl)
97 { FIPS_ERROR_IGNORED("Cipher update"); return 0;}
99 /* NB: no cleanup because it is allowed after failed init */
101 int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
102 { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}
103 int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
104 { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}
105 int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
106 { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}
108 static const EVP_CIPHER bad_cipher =
127 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
128 const unsigned char *key, const unsigned char *iv, int enc)
138 #ifndef OPENSSL_NO_ENGINE
139 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
140 * so this context may already have an ENGINE! Try to avoid releasing
141 * the previous handle, re-querying for an ENGINE, and having a
142 * reinitialisation, when it may all be unecessary. */
143 if (ctx->engine && ctx->cipher && (!cipher ||
144 (cipher && (cipher->nid == ctx->cipher->nid))))
149 /* Ensure a context left lying around from last time is cleared
150 * (the previous check attempted to avoid this if the same
151 * ENGINE and EVP_CIPHER could be used). */
152 EVP_CIPHER_CTX_cleanup(ctx);
154 /* Restore encrypt field: it is zeroed by cleanup */
156 #ifndef OPENSSL_NO_ENGINE
159 if (!ENGINE_init(impl))
161 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
166 /* Ask if an ENGINE is reserved for this job */
167 impl = ENGINE_get_cipher_engine(cipher->nid);
170 /* There's an ENGINE for this job ... (apparently) */
171 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
174 /* One positive side-effect of US's export
175 * control history, is that we should at least
176 * be able to avoid using US mispellings of
177 * "initialisation"? */
178 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
181 /* We'll use the ENGINE's private cipher definition */
183 /* Store the ENGINE functional reference so we know
184 * 'cipher' came from an ENGINE and we need to release
192 if (ctx->cipher->ctx_size)
194 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
195 if (!ctx->cipher_data)
197 EVPerr(EVP_F_EVP_CIPHERINIT, ERR_R_MALLOC_FAILURE);
203 ctx->cipher_data = NULL;
205 ctx->key_len = cipher->key_len;
207 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
209 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
211 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
216 else if(!ctx->cipher)
218 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
221 #ifndef OPENSSL_NO_ENGINE
224 /* we assume block size is a power of 2 in *cryptUpdate */
225 OPENSSL_assert(ctx->cipher->block_size == 1
226 || ctx->cipher->block_size == 8
227 || ctx->cipher->block_size == 16);
229 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
230 switch(EVP_CIPHER_CTX_mode(ctx)) {
232 case EVP_CIPH_STREAM_CIPHER:
233 case EVP_CIPH_ECB_MODE:
236 case EVP_CIPH_CFB_MODE:
237 case EVP_CIPH_OFB_MODE:
241 case EVP_CIPH_CBC_MODE:
243 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= sizeof ctx->iv);
244 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
245 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
255 /* After 'key' is set no further parameters changes are permissible.
256 * So only check for non FIPS enabling at this point.
258 if (key && FIPS_mode())
260 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
261 & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
263 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_DISABLED_FOR_FIPS);
264 ERR_add_error_data(2, "cipher=",
265 EVP_CIPHER_name(ctx->cipher));
266 ctx->cipher = &bad_cipher;
272 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
273 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
277 ctx->block_mask=ctx->cipher->block_size-1;
281 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
282 const unsigned char *in, int inl)
285 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
286 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
289 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
292 return EVP_EncryptFinal_ex(ctx,out,outl);
293 else return EVP_DecryptFinal_ex(ctx,out,outl);
296 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
299 return EVP_EncryptFinal(ctx,out,outl);
300 else return EVP_DecryptFinal(ctx,out,outl);
303 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
304 const unsigned char *key, const unsigned char *iv)
306 return EVP_CipherInit(ctx, cipher, key, iv, 1);
309 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
310 const unsigned char *key, const unsigned char *iv)
312 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
315 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
316 const unsigned char *key, const unsigned char *iv)
318 return EVP_CipherInit(ctx, cipher, key, iv, 0);
321 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
322 const unsigned char *key, const unsigned char *iv)
324 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
327 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
328 const unsigned char *in, int inl)
332 OPENSSL_assert(inl > 0);
333 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
335 if(ctx->cipher->do_cipher(ctx,out,in,inl))
347 bl=ctx->cipher->block_size;
348 OPENSSL_assert(bl <= sizeof ctx->buf);
353 memcpy(&(ctx->buf[i]),in,inl);
361 memcpy(&(ctx->buf[i]),in,j);
362 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
375 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
380 memcpy(ctx->buf,&(in[inl]),i);
385 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
388 ret = EVP_EncryptFinal_ex(ctx, out, outl);
392 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
396 b=ctx->cipher->block_size;
397 OPENSSL_assert(b <= sizeof ctx->buf);
404 if (ctx->flags & EVP_CIPH_NO_PADDING)
408 EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
418 ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
427 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
428 const unsigned char *in, int inl)
438 if (ctx->flags & EVP_CIPH_NO_PADDING)
439 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
441 b=ctx->cipher->block_size;
442 OPENSSL_assert(b <= sizeof ctx->final);
446 memcpy(out,ctx->final,b);
454 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
457 /* if we have 'decrypted' a multiple of block size, make sure
458 * we have a copy of this last block */
459 if (b > 1 && !ctx->buf_len)
463 memcpy(ctx->final,&out[*outl],b);
474 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
477 ret = EVP_DecryptFinal_ex(ctx, out, outl);
481 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
487 b=ctx->cipher->block_size;
488 if (ctx->flags & EVP_CIPH_NO_PADDING)
492 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
500 if (ctx->buf_len || !ctx->final_used)
502 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
505 OPENSSL_assert(b <= sizeof ctx->final);
509 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
514 if (ctx->final[--b] != n)
516 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
520 n=ctx->cipher->block_size-n;
522 out[i]=ctx->final[i];
530 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
532 if (c->cipher != NULL)
534 if(c->cipher->cleanup && !c->cipher->cleanup(c))
536 /* Cleanse cipher context data */
538 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
541 OPENSSL_free(c->cipher_data);
542 #ifndef OPENSSL_NO_ENGINE
544 /* The EVP_CIPHER we used belongs to an ENGINE, release the
545 * functional reference we held for this reason. */
546 ENGINE_finish(c->engine);
548 memset(c,0,sizeof(EVP_CIPHER_CTX));
552 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
554 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
555 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
556 if(c->key_len == keylen) return 1;
557 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
562 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
566 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
568 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
569 else ctx->flags |= EVP_CIPH_NO_PADDING;
573 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
577 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
581 if(!ctx->cipher->ctrl) {
582 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
586 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
588 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);