1 /* crypto/evp/evp_enc.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>
67 const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
69 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
71 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
72 /* ctx->cipher=NULL; */
75 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
76 unsigned char *key, unsigned char *iv, int enc)
78 if(enc && (enc != -1)) enc = 1;
81 ctx->key_len = cipher->key_len;
83 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
84 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
85 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
89 } else if(!ctx->cipher) {
90 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
94 /* we assume block size is a power of 2 in *cryptUpdate */
95 assert(ctx->cipher->block_size == 1
96 || ctx->cipher->block_size == 8
97 || ctx->cipher->block_size == 16);
99 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
100 switch(EVP_CIPHER_CTX_mode(ctx)) {
102 case EVP_CIPH_STREAM_CIPHER:
103 case EVP_CIPH_ECB_MODE:
106 case EVP_CIPH_CFB_MODE:
107 case EVP_CIPH_OFB_MODE:
111 case EVP_CIPH_CBC_MODE:
113 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
114 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
123 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
124 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
126 if(enc != -1) ctx->encrypt=enc;
131 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
132 unsigned char *in, int inl)
135 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
136 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
139 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
142 return EVP_EncryptFinal(ctx,out,outl);
143 else return(EVP_DecryptFinal(ctx,out,outl));
146 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
147 unsigned char *key, unsigned char *iv)
149 return EVP_CipherInit(ctx, cipher, key, iv, 1);
152 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
153 unsigned char *key, unsigned char *iv)
155 return EVP_CipherInit(ctx, cipher, key, iv, 0);
158 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
159 unsigned char *in, int inl)
164 bl=ctx->cipher->block_size;
166 if ((inl == 0) && (i != bl)) return 1;
171 memcpy(&(ctx->buf[i]),in,inl);
178 if (j != 0) memcpy(&(ctx->buf[i]),in,j);
179 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
186 // i=inl%bl; /* how much is left */
191 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
196 memcpy(ctx->buf,&(in[inl]),i);
201 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
205 b=ctx->cipher->block_size;
212 if (ctx->flags & EVP_CIPH_NO_PADDING)
216 EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
225 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0;
230 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
231 unsigned char *in, int inl)
237 if (inl == 0) return 1;
239 if (ctx->flags & EVP_CIPH_NO_PADDING)
240 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
242 b=ctx->cipher->block_size;
245 /* Is the input a multiple of the block size? */
250 if (inl < b) /* must be 'just one' buff */
252 memcpy(&(ctx->buf[bl]),in,inl);
258 inl-=b; /* don't do the last block */
261 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0;
263 /* if we have 'decrypted' a multiple of block size, make sure
264 * we have a copy of this last block */
267 memcpy(&(ctx->buf[0]),&(in[inl]),b);
269 if (ctx->buf_len != 0)
279 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
285 b=ctx->cipher->block_size;
286 if (ctx->flags & EVP_CIPH_NO_PADDING)
290 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
298 if (ctx->buf_len != b)
300 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
303 if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
309 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
314 if (ctx->buf[--b] != n)
316 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
320 n=ctx->cipher->block_size-n;
330 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
332 if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
334 if(!c->cipher->cleanup(c)) return 0;
336 memset(c,0,sizeof(EVP_CIPHER_CTX));
340 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
342 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
343 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
344 if(c->key_len == keylen) return 1;
345 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
350 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
354 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
356 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
357 else ctx->flags |= EVP_CIPH_NO_PADDING;
361 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
365 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
369 if(!ctx->cipher->ctrl) {
370 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
374 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
376 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);