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diff --git a/src/lib/libcrypto/evp/evp_enc.c b/src/lib/libcrypto/evp/evp_enc.c
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1/* crypto/evp/evp_enc.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/evp.h>
62#include <openssl/err.h>
63#include "evp_locl.h"
64
65const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
66
67void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
68 {
69 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
70 /* ctx->cipher=NULL; */
71 }
72
73int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
74 unsigned char *key, unsigned char *iv, int enc)
75 {
76 if(enc && (enc != -1)) enc = 1;
77 if (cipher) {
78 ctx->cipher=cipher;
79 ctx->key_len = cipher->key_len;
80 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
81 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
82 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
83 return 0;
84 }
85 }
86 } else if(!ctx->cipher) {
87 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
88 return 0;
89 }
90 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
91 switch(EVP_CIPHER_CTX_mode(ctx)) {
92
93 case EVP_CIPH_STREAM_CIPHER:
94 case EVP_CIPH_ECB_MODE:
95 break;
96
97 case EVP_CIPH_CFB_MODE:
98 case EVP_CIPH_OFB_MODE:
99
100 ctx->num = 0;
101
102 case EVP_CIPH_CBC_MODE:
103
104 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
105 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
106 break;
107
108 default:
109 return 0;
110 break;
111 }
112 }
113
114 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
115 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
116 }
117 if(enc != -1) ctx->encrypt=enc;
118 ctx->buf_len=0;
119 return 1;
120 }
121
122int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
123 unsigned char *in, int inl)
124 {
125 if (ctx->encrypt)
126 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
127 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
128 }
129
130int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
131 {
132 if (ctx->encrypt)
133 return EVP_EncryptFinal(ctx,out,outl);
134 else return(EVP_DecryptFinal(ctx,out,outl));
135 }
136
137int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
138 unsigned char *key, unsigned char *iv)
139 {
140 return EVP_CipherInit(ctx, cipher, key, iv, 1);
141 }
142
143int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
144 unsigned char *key, unsigned char *iv)
145 {
146 return EVP_CipherInit(ctx, cipher, key, iv, 0);
147 }
148
149
150int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
151 unsigned char *in, int inl)
152 {
153 int i,j,bl;
154
155 i=ctx->buf_len;
156 bl=ctx->cipher->block_size;
157 *outl=0;
158 if ((inl == 0) && (i != bl)) return 1;
159 if (i != 0)
160 {
161 if (i+inl < bl)
162 {
163 memcpy(&(ctx->buf[i]),in,inl);
164 ctx->buf_len+=inl;
165 return 1;
166 }
167 else
168 {
169 j=bl-i;
170 if (j != 0) memcpy(&(ctx->buf[i]),in,j);
171 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
172 inl-=j;
173 in+=j;
174 out+=bl;
175 *outl+=bl;
176 }
177 }
178 i=inl%bl; /* how much is left */
179 inl-=i;
180 if (inl > 0)
181 {
182 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
183 *outl+=inl;
184 }
185
186 if (i != 0)
187 memcpy(ctx->buf,&(in[inl]),i);
188 ctx->buf_len=i;
189 return 1;
190 }
191
192int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
193 {
194 int i,n,b,bl;
195
196 b=ctx->cipher->block_size;
197 if (b == 1)
198 {
199 *outl=0;
200 return 1;
201 }
202 bl=ctx->buf_len;
203 n=b-bl;
204 for (i=bl; i<b; i++)
205 ctx->buf[i]=n;
206 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0;
207 *outl=b;
208 return 1;
209 }
210
211int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
212 unsigned char *in, int inl)
213 {
214 int b,bl,n;
215 int keep_last=0;
216
217 *outl=0;
218 if (inl == 0) return 1;
219
220 b=ctx->cipher->block_size;
221 if (b > 1)
222 {
223 /* Is the input a multiple of the block size? */
224 bl=ctx->buf_len;
225 n=inl+bl;
226 if (n%b == 0)
227 {
228 if (inl < b) /* must be 'just one' buff */
229 {
230 memcpy(&(ctx->buf[bl]),in,inl);
231 ctx->buf_len=b;
232 *outl=0;
233 return 1;
234 }
235 keep_last=1;
236 inl-=b; /* don't do the last block */
237 }
238 }
239 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0;
240
241 /* if we have 'decrypted' a multiple of block size, make sure
242 * we have a copy of this last block */
243 if (keep_last)
244 {
245 memcpy(&(ctx->buf[0]),&(in[inl]),b);
246#ifdef DEBUG
247 if (ctx->buf_len != 0)
248 {
249 abort();
250 }
251#endif
252 ctx->buf_len=b;
253 }
254 return 1;
255 }
256
257int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
258 {
259 int i,b;
260 int n;
261
262 *outl=0;
263 b=ctx->cipher->block_size;
264 if (b > 1)
265 {
266 if (ctx->buf_len != b)
267 {
268 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
269 return(0);
270 }
271 if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
272 if (n != b)
273 return(0);
274 n=ctx->buf[b-1];
275 if (n > b)
276 {
277 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
278 return(0);
279 }
280 for (i=0; i<n; i++)
281 {
282 if (ctx->buf[--b] != n)
283 {
284 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
285 return(0);
286 }
287 }
288 n=ctx->cipher->block_size-n;
289 for (i=0; i<n; i++)
290 out[i]=ctx->buf[i];
291 *outl=n;
292 }
293 else
294 *outl=0;
295 return(1);
296 }
297
298int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
299 {
300 if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
301 {
302 if(!c->cipher->cleanup(c)) return 0;
303 }
304 memset(c,0,sizeof(EVP_CIPHER_CTX));
305 return 1;
306 }
307
308int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
309 {
310 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
311 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
312 if(c->key_len == keylen) return 1;
313 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
314 {
315 c->key_len = keylen;
316 return 1;
317 }
318 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
319 return 0;
320 }
321
322int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
323{
324 int ret;
325 if(!ctx->cipher) {
326 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
327 return 0;
328 }
329
330 if(!ctx->cipher->ctrl) {
331 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
332 return 0;
333 }
334
335 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
336 if(ret == -1) {
337 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
338 return 0;
339 }
340 return ret;
341}
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