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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" | |
ec577822 | 61 | #include <openssl/evp.h> |
7f060601 | 62 | #include <openssl/err.h> |
d02b48c6 | 63 | |
e778802f | 64 | const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT; |
58964a49 | 65 | |
6b691a5c | 66 | void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) |
58964a49 RE |
67 | { |
68 | memset(ctx,0,sizeof(EVP_CIPHER_CTX)); | |
69 | /* ctx->cipher=NULL; */ | |
70 | } | |
d02b48c6 | 71 | |
be06a934 | 72 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *data, |
6b691a5c | 73 | unsigned char *key, unsigned char *iv, int enc) |
d02b48c6 | 74 | { |
be06a934 DSH |
75 | if (enc) return EVP_EncryptInit(ctx,data,key,iv); |
76 | else return EVP_DecryptInit(ctx,data,key,iv); | |
d02b48c6 RE |
77 | } |
78 | ||
be06a934 | 79 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
6b691a5c | 80 | unsigned char *in, int inl) |
d02b48c6 RE |
81 | { |
82 | if (ctx->encrypt) | |
be06a934 DSH |
83 | return EVP_EncryptUpdate(ctx,out,outl,in,inl); |
84 | else return EVP_DecryptUpdate(ctx,out,outl,in,inl); | |
d02b48c6 RE |
85 | } |
86 | ||
6b691a5c | 87 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
88 | { |
89 | if (ctx->encrypt) | |
be06a934 | 90 | return EVP_EncryptFinal(ctx,out,outl); |
d02b48c6 RE |
91 | else return(EVP_DecryptFinal(ctx,out,outl)); |
92 | } | |
93 | ||
be06a934 | 94 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
6b691a5c | 95 | unsigned char *key, unsigned char *iv) |
d02b48c6 RE |
96 | { |
97 | if (cipher != NULL) | |
7f060601 | 98 | { |
d02b48c6 | 99 | ctx->cipher=cipher; |
7f060601 DSH |
100 | ctx->key_len = cipher->key_len; |
101 | } | |
be06a934 | 102 | if(!ctx->cipher->init(ctx,key,iv,1)) return 0; |
d02b48c6 RE |
103 | ctx->encrypt=1; |
104 | ctx->buf_len=0; | |
be06a934 | 105 | return 1; |
d02b48c6 RE |
106 | } |
107 | ||
be06a934 | 108 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
6b691a5c | 109 | unsigned char *key, unsigned char *iv) |
d02b48c6 RE |
110 | { |
111 | if (cipher != NULL) | |
7f060601 | 112 | { |
d02b48c6 | 113 | ctx->cipher=cipher; |
7f060601 DSH |
114 | ctx->key_len = cipher->key_len; |
115 | } | |
be06a934 | 116 | if(!ctx->cipher->init(ctx,key,iv,0)) return 0; |
d02b48c6 RE |
117 | ctx->encrypt=0; |
118 | ctx->buf_len=0; | |
be06a934 | 119 | return 1; |
d02b48c6 RE |
120 | } |
121 | ||
122 | ||
be06a934 | 123 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
6b691a5c | 124 | unsigned char *in, int inl) |
d02b48c6 RE |
125 | { |
126 | int i,j,bl; | |
127 | ||
128 | i=ctx->buf_len; | |
129 | bl=ctx->cipher->block_size; | |
130 | *outl=0; | |
be06a934 | 131 | if ((inl == 0) && (i != bl)) return 1; |
d02b48c6 RE |
132 | if (i != 0) |
133 | { | |
134 | if (i+inl < bl) | |
135 | { | |
136 | memcpy(&(ctx->buf[i]),in,inl); | |
137 | ctx->buf_len+=inl; | |
be06a934 | 138 | return 1; |
d02b48c6 RE |
139 | } |
140 | else | |
141 | { | |
142 | j=bl-i; | |
143 | if (j != 0) memcpy(&(ctx->buf[i]),in,j); | |
be06a934 | 144 | if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0; |
d02b48c6 RE |
145 | inl-=j; |
146 | in+=j; | |
147 | out+=bl; | |
148 | *outl+=bl; | |
149 | } | |
150 | } | |
151 | i=inl%bl; /* how much is left */ | |
152 | inl-=i; | |
153 | if (inl > 0) | |
154 | { | |
be06a934 | 155 | if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0; |
d02b48c6 RE |
156 | *outl+=inl; |
157 | } | |
158 | ||
159 | if (i != 0) | |
160 | memcpy(ctx->buf,&(in[inl]),i); | |
161 | ctx->buf_len=i; | |
be06a934 | 162 | return 1; |
d02b48c6 RE |
163 | } |
164 | ||
be06a934 | 165 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
166 | { |
167 | int i,n,b,bl; | |
168 | ||
169 | b=ctx->cipher->block_size; | |
170 | if (b == 1) | |
171 | { | |
172 | *outl=0; | |
be06a934 | 173 | return 1; |
d02b48c6 RE |
174 | } |
175 | bl=ctx->buf_len; | |
176 | n=b-bl; | |
177 | for (i=bl; i<b; i++) | |
178 | ctx->buf[i]=n; | |
be06a934 | 179 | if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0; |
d02b48c6 | 180 | *outl=b; |
be06a934 | 181 | return 1; |
d02b48c6 RE |
182 | } |
183 | ||
be06a934 | 184 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
6b691a5c | 185 | unsigned char *in, int inl) |
d02b48c6 RE |
186 | { |
187 | int b,bl,n; | |
188 | int keep_last=0; | |
189 | ||
190 | *outl=0; | |
be06a934 | 191 | if (inl == 0) return 1; |
d02b48c6 RE |
192 | |
193 | b=ctx->cipher->block_size; | |
194 | if (b > 1) | |
195 | { | |
196 | /* Is the input a multiple of the block size? */ | |
197 | bl=ctx->buf_len; | |
198 | n=inl+bl; | |
199 | if (n%b == 0) | |
200 | { | |
201 | if (inl < b) /* must be 'just one' buff */ | |
202 | { | |
203 | memcpy(&(ctx->buf[bl]),in,inl); | |
204 | ctx->buf_len=b; | |
205 | *outl=0; | |
be06a934 | 206 | return 1; |
d02b48c6 RE |
207 | } |
208 | keep_last=1; | |
209 | inl-=b; /* don't do the last block */ | |
210 | } | |
211 | } | |
be06a934 | 212 | if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0; |
d02b48c6 RE |
213 | |
214 | /* if we have 'decrypted' a multiple of block size, make sure | |
215 | * we have a copy of this last block */ | |
216 | if (keep_last) | |
217 | { | |
218 | memcpy(&(ctx->buf[0]),&(in[inl]),b); | |
219 | #ifdef DEBUG | |
220 | if (ctx->buf_len != 0) | |
221 | { | |
222 | abort(); | |
223 | } | |
224 | #endif | |
225 | ctx->buf_len=b; | |
226 | } | |
be06a934 | 227 | return 1; |
d02b48c6 RE |
228 | } |
229 | ||
6b691a5c | 230 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
231 | { |
232 | int i,b; | |
233 | int n; | |
234 | ||
235 | *outl=0; | |
236 | b=ctx->cipher->block_size; | |
237 | if (b > 1) | |
238 | { | |
239 | if (ctx->buf_len != b) | |
240 | { | |
241 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
242 | return(0); | |
243 | } | |
be06a934 | 244 | if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0; |
d02b48c6 RE |
245 | if (n != b) |
246 | return(0); | |
247 | n=ctx->buf[b-1]; | |
248 | if (n > b) | |
249 | { | |
250 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); | |
251 | return(0); | |
252 | } | |
253 | for (i=0; i<n; i++) | |
254 | { | |
255 | if (ctx->buf[--b] != n) | |
256 | { | |
257 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); | |
258 | return(0); | |
259 | } | |
260 | } | |
261 | n=ctx->cipher->block_size-n; | |
262 | for (i=0; i<n; i++) | |
263 | out[i]=ctx->buf[i]; | |
264 | *outl=n; | |
265 | } | |
266 | else | |
267 | *outl=0; | |
268 | return(1); | |
269 | } | |
270 | ||
be06a934 | 271 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) |
d02b48c6 RE |
272 | { |
273 | if ((c->cipher != NULL) && (c->cipher->cleanup != NULL)) | |
be06a934 DSH |
274 | { |
275 | if(!c->cipher->cleanup(c)) return 0; | |
276 | } | |
d02b48c6 | 277 | memset(c,0,sizeof(EVP_CIPHER_CTX)); |
be06a934 | 278 | return 1; |
d02b48c6 RE |
279 | } |
280 | ||
7f060601 DSH |
281 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
282 | { | |
283 | if(c->key_len == keylen) return 1; | |
284 | if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) | |
285 | { | |
286 | c->key_len = keylen; | |
287 | return 1; | |
288 | } | |
289 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); | |
290 | return 0; | |
291 | } | |
292 |