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d02b48c6 | 1 | /* crypto/evp/evp_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 "evp.h" | |
62 | ||
e778802f | 63 | const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT; |
58964a49 RE |
64 | |
65 | void EVP_CIPHER_CTX_init(ctx) | |
66 | EVP_CIPHER_CTX *ctx; | |
67 | { | |
68 | memset(ctx,0,sizeof(EVP_CIPHER_CTX)); | |
69 | /* ctx->cipher=NULL; */ | |
70 | } | |
d02b48c6 RE |
71 | |
72 | void EVP_CipherInit(ctx,data,key,iv,enc) | |
73 | EVP_CIPHER_CTX *ctx; | |
e778802f | 74 | const EVP_CIPHER *data; |
d02b48c6 RE |
75 | unsigned char *key; |
76 | unsigned char *iv; | |
77 | int enc; | |
78 | { | |
79 | if (enc) | |
80 | EVP_EncryptInit(ctx,data,key,iv); | |
81 | else | |
82 | EVP_DecryptInit(ctx,data,key,iv); | |
83 | } | |
84 | ||
85 | void EVP_CipherUpdate(ctx,out,outl,in,inl) | |
86 | EVP_CIPHER_CTX *ctx; | |
87 | unsigned char *out; | |
88 | int *outl; | |
89 | unsigned char *in; | |
90 | int inl; | |
91 | { | |
92 | if (ctx->encrypt) | |
93 | EVP_EncryptUpdate(ctx,out,outl,in,inl); | |
94 | else EVP_DecryptUpdate(ctx,out,outl,in,inl); | |
95 | } | |
96 | ||
97 | int EVP_CipherFinal(ctx,out,outl) | |
98 | EVP_CIPHER_CTX *ctx; | |
99 | unsigned char *out; | |
100 | int *outl; | |
101 | { | |
102 | if (ctx->encrypt) | |
103 | { | |
104 | EVP_EncryptFinal(ctx,out,outl); | |
105 | return(1); | |
106 | } | |
107 | else return(EVP_DecryptFinal(ctx,out,outl)); | |
108 | } | |
109 | ||
110 | void EVP_EncryptInit(ctx,cipher,key,iv) | |
111 | EVP_CIPHER_CTX *ctx; | |
e778802f | 112 | const EVP_CIPHER *cipher; |
d02b48c6 RE |
113 | unsigned char *key; |
114 | unsigned char *iv; | |
115 | { | |
116 | if (cipher != NULL) | |
117 | ctx->cipher=cipher; | |
118 | ctx->cipher->init(ctx,key,iv,1); | |
119 | ctx->encrypt=1; | |
120 | ctx->buf_len=0; | |
121 | } | |
122 | ||
123 | void EVP_DecryptInit(ctx,cipher,key,iv) | |
124 | EVP_CIPHER_CTX *ctx; | |
e778802f | 125 | const EVP_CIPHER *cipher; |
d02b48c6 RE |
126 | unsigned char *key; |
127 | unsigned char *iv; | |
128 | { | |
129 | if (cipher != NULL) | |
130 | ctx->cipher=cipher; | |
131 | ctx->cipher->init(ctx,key,iv,0); | |
132 | ctx->encrypt=0; | |
133 | ctx->buf_len=0; | |
134 | } | |
135 | ||
136 | ||
137 | void EVP_EncryptUpdate(ctx,out,outl,in,inl) | |
138 | EVP_CIPHER_CTX *ctx; | |
139 | unsigned char *out; | |
140 | int *outl; | |
141 | unsigned char *in; | |
142 | int inl; | |
143 | { | |
144 | int i,j,bl; | |
145 | ||
146 | i=ctx->buf_len; | |
147 | bl=ctx->cipher->block_size; | |
148 | *outl=0; | |
149 | if ((inl == 0) && (i != bl)) return; | |
150 | if (i != 0) | |
151 | { | |
152 | if (i+inl < bl) | |
153 | { | |
154 | memcpy(&(ctx->buf[i]),in,inl); | |
155 | ctx->buf_len+=inl; | |
156 | return; | |
157 | } | |
158 | else | |
159 | { | |
160 | j=bl-i; | |
161 | if (j != 0) memcpy(&(ctx->buf[i]),in,j); | |
162 | ctx->cipher->do_cipher(ctx,out,ctx->buf,bl); | |
163 | inl-=j; | |
164 | in+=j; | |
165 | out+=bl; | |
166 | *outl+=bl; | |
167 | } | |
168 | } | |
169 | i=inl%bl; /* how much is left */ | |
170 | inl-=i; | |
171 | if (inl > 0) | |
172 | { | |
173 | ctx->cipher->do_cipher(ctx,out,in,inl); | |
174 | *outl+=inl; | |
175 | } | |
176 | ||
177 | if (i != 0) | |
178 | memcpy(ctx->buf,&(in[inl]),i); | |
179 | ctx->buf_len=i; | |
180 | } | |
181 | ||
182 | void EVP_EncryptFinal(ctx,out,outl) | |
183 | EVP_CIPHER_CTX *ctx; | |
184 | unsigned char *out; | |
185 | int *outl; | |
186 | { | |
187 | int i,n,b,bl; | |
188 | ||
189 | b=ctx->cipher->block_size; | |
190 | if (b == 1) | |
191 | { | |
192 | *outl=0; | |
193 | return; | |
194 | } | |
195 | bl=ctx->buf_len; | |
196 | n=b-bl; | |
197 | for (i=bl; i<b; i++) | |
198 | ctx->buf[i]=n; | |
199 | ctx->cipher->do_cipher(ctx,out,ctx->buf,b); | |
200 | *outl=b; | |
201 | } | |
202 | ||
203 | void EVP_DecryptUpdate(ctx,out,outl,in,inl) | |
204 | EVP_CIPHER_CTX *ctx; | |
205 | unsigned char *out; | |
206 | int *outl; | |
207 | unsigned char *in; | |
208 | int inl; | |
209 | { | |
210 | int b,bl,n; | |
211 | int keep_last=0; | |
212 | ||
213 | *outl=0; | |
214 | if (inl == 0) return; | |
215 | ||
216 | b=ctx->cipher->block_size; | |
217 | if (b > 1) | |
218 | { | |
219 | /* Is the input a multiple of the block size? */ | |
220 | bl=ctx->buf_len; | |
221 | n=inl+bl; | |
222 | if (n%b == 0) | |
223 | { | |
224 | if (inl < b) /* must be 'just one' buff */ | |
225 | { | |
226 | memcpy(&(ctx->buf[bl]),in,inl); | |
227 | ctx->buf_len=b; | |
228 | *outl=0; | |
229 | return; | |
230 | } | |
231 | keep_last=1; | |
232 | inl-=b; /* don't do the last block */ | |
233 | } | |
234 | } | |
235 | EVP_EncryptUpdate(ctx,out,outl,in,inl); | |
236 | ||
237 | /* if we have 'decrypted' a multiple of block size, make sure | |
238 | * we have a copy of this last block */ | |
239 | if (keep_last) | |
240 | { | |
241 | memcpy(&(ctx->buf[0]),&(in[inl]),b); | |
242 | #ifdef DEBUG | |
243 | if (ctx->buf_len != 0) | |
244 | { | |
245 | abort(); | |
246 | } | |
247 | #endif | |
248 | ctx->buf_len=b; | |
249 | } | |
250 | } | |
251 | ||
252 | int EVP_DecryptFinal(ctx,out,outl) | |
253 | EVP_CIPHER_CTX *ctx; | |
254 | unsigned char *out; | |
255 | int *outl; | |
256 | { | |
257 | int i,b; | |
258 | int n; | |
259 | ||
260 | *outl=0; | |
261 | b=ctx->cipher->block_size; | |
262 | if (b > 1) | |
263 | { | |
264 | if (ctx->buf_len != b) | |
265 | { | |
266 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
267 | return(0); | |
268 | } | |
269 | EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0); | |
270 | if (n != b) | |
271 | return(0); | |
272 | n=ctx->buf[b-1]; | |
273 | if (n > b) | |
274 | { | |
275 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); | |
276 | return(0); | |
277 | } | |
278 | for (i=0; i<n; i++) | |
279 | { | |
280 | if (ctx->buf[--b] != n) | |
281 | { | |
282 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); | |
283 | return(0); | |
284 | } | |
285 | } | |
286 | n=ctx->cipher->block_size-n; | |
287 | for (i=0; i<n; i++) | |
288 | out[i]=ctx->buf[i]; | |
289 | *outl=n; | |
290 | } | |
291 | else | |
292 | *outl=0; | |
293 | return(1); | |
294 | } | |
295 | ||
296 | void EVP_CIPHER_CTX_cleanup(c) | |
297 | EVP_CIPHER_CTX *c; | |
298 | { | |
299 | if ((c->cipher != NULL) && (c->cipher->cleanup != NULL)) | |
300 | c->cipher->cleanup(c); | |
301 | memset(c,0,sizeof(EVP_CIPHER_CTX)); | |
302 | } | |
303 |