1 /* crypto/evp/bio_enc.c */
2 /* Copyright (C) 1995-1997 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.]
66 static int enc_write(BIO *h,char *buf,int num);
67 static int enc_read(BIO *h,char *buf,int size);
68 /*static int enc_puts(BIO *h,char *str); */
69 /*static int enc_gets(BIO *h,char *str,int size); */
70 static long enc_ctrl(BIO *h,int cmd,long arg1,char *arg2);
71 static int enc_new(BIO *h);
72 static int enc_free(BIO *data);
74 static int enc_write();
75 static int enc_read();
76 /*static int enc_puts(); */
77 /*static int enc_gets(); */
78 static long enc_ctrl();
80 static int enc_free();
83 #define ENC_BLOCK_SIZE (1024*4)
85 typedef struct enc_struct
89 int cont; /* <= 0 when finished */
91 int ok; /* bad decrypt */
92 EVP_CIPHER_CTX cipher;
93 char buf[ENC_BLOCK_SIZE+10];
96 static BIO_METHOD methods_enc=
98 BIO_TYPE_CIPHER,"cipher",
101 NULL, /* enc_puts, */
102 NULL, /* enc_gets, */
108 BIO_METHOD *BIO_f_cipher()
110 return(&methods_enc);
113 static int enc_new(bi)
118 ctx=(BIO_ENC_CTX *)Malloc(sizeof(BIO_ENC_CTX));
119 if (ctx == NULL) return(0);
133 static int enc_free(a)
138 if (a == NULL) return(0);
139 b=(BIO_ENC_CTX *)a->ptr;
140 EVP_CIPHER_CTX_cleanup(&(b->cipher));
141 memset(a->ptr,0,sizeof(BIO_ENC_CTX));
149 static int enc_read(b,out,outl)
157 if (out == NULL) return(0);
158 ctx=(BIO_ENC_CTX *)b->ptr;
160 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
162 /* First check if there are bytes decoded/encoded */
163 if (ctx->buf_len > 0)
165 i=ctx->buf_len-ctx->buf_off;
166 if (i > outl) i=outl;
167 memcpy(out,&(ctx->buf[ctx->buf_off]),i);
172 if (ctx->buf_len == ctx->buf_off)
179 /* At this point, we have room of outl bytes and an empty
180 * buffer, so we should read in some more. */
184 if (ctx->cont <= 0) break;
186 /* read in at offset 8, read the EVP_Cipher
187 * documentation about why */
188 i=BIO_read(b->next_bio,&(ctx->buf[8]),ENC_BLOCK_SIZE);
192 /* Should be continue next time we are called? */
193 if (!BIO_should_retry(b->next_bio))
196 i=EVP_CipherFinal(&(ctx->cipher),
197 (unsigned char *)ctx->buf,
203 ret=(ret == 0)?i:ret;
208 EVP_CipherUpdate(&(ctx->cipher),
209 (unsigned char *)ctx->buf,&ctx->buf_len,
210 (unsigned char *)&(ctx->buf[8]),i);
214 if (ctx->buf_len <= outl)
220 memcpy(out,ctx->buf,i);
227 BIO_clear_retry_flags(b);
228 BIO_copy_next_retry(b);
229 return((ret == 0)?ctx->cont:ret);
232 static int enc_write(b,in,inl)
240 ctx=(BIO_ENC_CTX *)b->ptr;
243 BIO_clear_retry_flags(b);
244 n=ctx->buf_len-ctx->buf_off;
247 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
250 BIO_copy_next_retry(b);
256 /* at this point all pending data has been written */
258 if ((in == NULL) || (inl <= 0)) return(0);
263 n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
264 EVP_CipherUpdate(&(ctx->cipher),
265 (unsigned char *)ctx->buf,&ctx->buf_len,
266 (unsigned char *)in,n);
274 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
277 BIO_copy_next_retry(b);
286 BIO_copy_next_retry(b);
290 static long enc_ctrl(b,cmd,num,ptr)
297 BIO_ENC_CTX *ctx,*dctx;
301 ctx=(BIO_ENC_CTX *)b->ptr;
308 EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
309 ctx->cipher.encrypt);
310 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
312 case BIO_CTRL_EOF: /* More to read */
316 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
318 case BIO_CTRL_WPENDING:
319 ret=ctx->buf_len-ctx->buf_off;
321 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
323 case BIO_CTRL_PENDING: /* More to read in buffer */
324 ret=ctx->buf_len-ctx->buf_off;
326 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
329 /* do a final write */
331 while (ctx->buf_len != ctx->buf_off)
333 i=enc_write(b,NULL,0);
345 ret=EVP_CipherFinal(&(ctx->cipher),
346 (unsigned char *)ctx->buf,
351 /* push out the bytes */
355 /* Finally flush the underlying BIO */
356 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
358 case BIO_C_GET_CIPHER_STATUS:
361 case BIO_C_DO_STATE_MACHINE:
362 BIO_clear_retry_flags(b);
363 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
364 BIO_copy_next_retry(b);
369 dctx=(BIO_ENC_CTX *)dbio->ptr;
370 memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
374 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
380 void BIO_set_cipher(b,c,k,i,e)
389 if (b == NULL) return;
391 if ((b->callback != NULL) &&
392 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
396 ctx=(BIO_ENC_CTX *)b->ptr;
397 EVP_CipherInit(&(ctx->cipher),c,k,i,e);
399 if (b->callback != NULL)
400 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);