1 /* crypto/evp/enc_min.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 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
72 FIPS_selftest_check();
74 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
75 /* ctx->cipher=NULL; */
80 /* The purpose of these is to trap programs that attempt to use non FIPS
81 * algorithms in FIPS mode and ignore the errors.
84 static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
85 const unsigned char *iv, int enc)
86 { FIPS_ERROR_IGNORED("Cipher init"); return 0;}
88 static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
89 const unsigned char *in, unsigned int inl)
90 { FIPS_ERROR_IGNORED("Cipher update"); return 0;}
92 /* NB: no cleanup because it is allowed after failed init */
94 static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
95 { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}
96 static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
97 { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}
98 static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
99 { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}
101 static const EVP_CIPHER bad_cipher =
120 #ifndef OPENSSL_NO_ENGINE
124 static int do_engine_null(ENGINE *impl) { return 0;}
125 static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx,
126 const EVP_CIPHER **pciph, ENGINE *impl)
129 static int (*do_engine_finish)(ENGINE *impl)
132 static int (*do_evp_enc_engine)
133 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)
134 = do_evp_enc_engine_null;
136 void int_EVP_CIPHER_set_engine_callbacks(
137 int (*eng_ciph_fin)(ENGINE *impl),
139 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl))
141 do_engine_finish = eng_ciph_fin;
142 do_evp_enc_engine = eng_ciph_evp;
147 #define do_engine_finish ENGINE_finish
149 static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
153 if (!ENGINE_init(impl))
155 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
160 /* Ask if an ENGINE is reserved for this job */
161 impl = ENGINE_get_cipher_engine((*pcipher)->nid);
164 /* There's an ENGINE for this job ... (apparently) */
165 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
168 /* One positive side-effect of US's export
169 * control history, is that we should at least
170 * be able to avoid using US mispellings of
171 * "initialisation"? */
172 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
175 /* We'll use the ENGINE's private cipher definition */
177 /* Store the ENGINE functional reference so we know
178 * 'cipher' came from an ENGINE and we need to release
191 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
192 const unsigned char *key, const unsigned char *iv, int enc)
203 if(FIPS_selftest_failed())
205 FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED);
206 ctx->cipher = &bad_cipher;
210 #ifndef OPENSSL_NO_ENGINE
211 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
212 * so this context may already have an ENGINE! Try to avoid releasing
213 * the previous handle, re-querying for an ENGINE, and having a
214 * reinitialisation, when it may all be unecessary. */
215 if (ctx->engine && ctx->cipher && (!cipher ||
216 (cipher && (cipher->nid == ctx->cipher->nid))))
221 /* Ensure a context left lying around from last time is cleared
222 * (the previous check attempted to avoid this if the same
223 * ENGINE and EVP_CIPHER could be used). */
224 EVP_CIPHER_CTX_cleanup(ctx);
226 /* Restore encrypt field: it is zeroed by cleanup */
228 #ifndef OPENSSL_NO_ENGINE
229 if (!do_evp_enc_engine(ctx, &cipher, impl))
234 if (ctx->cipher->ctx_size)
236 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
237 if (!ctx->cipher_data)
239 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
245 ctx->cipher_data = NULL;
247 ctx->key_len = cipher->key_len;
249 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
251 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
253 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
258 else if(!ctx->cipher)
260 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
263 #ifndef OPENSSL_NO_ENGINE
266 /* we assume block size is a power of 2 in *cryptUpdate */
267 OPENSSL_assert(ctx->cipher->block_size == 1
268 || ctx->cipher->block_size == 8
269 || ctx->cipher->block_size == 16);
271 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
272 switch(EVP_CIPHER_CTX_mode(ctx)) {
274 case EVP_CIPH_STREAM_CIPHER:
275 case EVP_CIPH_ECB_MODE:
278 case EVP_CIPH_CFB_MODE:
279 case EVP_CIPH_OFB_MODE:
283 case EVP_CIPH_CBC_MODE:
285 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
286 (int)sizeof(ctx->iv));
287 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
288 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
298 /* After 'key' is set no further parameters changes are permissible.
299 * So only check for non FIPS enabling at this point.
301 if (key && FIPS_mode())
303 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
304 & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
306 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS);
308 ERR_add_error_data(2, "cipher=",
309 EVP_CIPHER_name(ctx->cipher));
311 ctx->cipher = &bad_cipher;
317 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
318 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
322 ctx->block_mask=ctx->cipher->block_size-1;
326 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
328 if (c->cipher != NULL)
330 if(c->cipher->cleanup && !c->cipher->cleanup(c))
332 /* Cleanse cipher context data */
334 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
337 OPENSSL_free(c->cipher_data);
338 #ifndef OPENSSL_NO_ENGINE
340 /* The EVP_CIPHER we used belongs to an ENGINE, release the
341 * functional reference we held for this reason. */
342 do_engine_finish(c->engine);
344 memset(c,0,sizeof(EVP_CIPHER_CTX));
348 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl)
351 FIPS_selftest_check();
353 return ctx->cipher->do_cipher(ctx,out,in,inl);
356 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
360 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
364 if(!ctx->cipher->ctrl) {
365 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
369 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
371 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
377 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
379 return ctx->cipher->flags;
382 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
384 return ctx->cipher->iv_len;
387 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)