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>
65 const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
67 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
69 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
70 /* ctx->cipher=NULL; */
73 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
74 unsigned char *key, unsigned char *iv, int enc)
79 ctx->key_len = cipher->key_len;
80 } else if(!ctx->cipher) {
81 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
84 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
85 switch(EVP_CIPHER_CTX_mode(ctx)) {
87 case EVP_CIPH_STREAM_CIPHER:
88 case EVP_CIPH_ECB_MODE:
91 case EVP_CIPH_CFB_MODE:
92 case EVP_CIPH_OFB_MODE:
96 case EVP_CIPH_CBC_MODE:
98 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
99 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
108 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
109 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
116 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
117 unsigned char *in, int inl)
120 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
121 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
124 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
127 return EVP_EncryptFinal(ctx,out,outl);
128 else return(EVP_DecryptFinal(ctx,out,outl));
131 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
132 unsigned char *key, unsigned char *iv)
134 return EVP_CipherInit(ctx, cipher, key, iv, 1);
137 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
138 unsigned char *key, unsigned char *iv)
140 return EVP_CipherInit(ctx, cipher, key, iv, 0);
144 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
145 unsigned char *in, int inl)
150 bl=ctx->cipher->block_size;
152 if ((inl == 0) && (i != bl)) return 1;
157 memcpy(&(ctx->buf[i]),in,inl);
164 if (j != 0) memcpy(&(ctx->buf[i]),in,j);
165 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
172 i=inl%bl; /* how much is left */
176 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
181 memcpy(ctx->buf,&(in[inl]),i);
186 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
190 b=ctx->cipher->block_size;
200 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0;
205 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
206 unsigned char *in, int inl)
212 if (inl == 0) return 1;
214 b=ctx->cipher->block_size;
217 /* Is the input a multiple of the block size? */
222 if (inl < b) /* must be 'just one' buff */
224 memcpy(&(ctx->buf[bl]),in,inl);
230 inl-=b; /* don't do the last block */
233 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0;
235 /* if we have 'decrypted' a multiple of block size, make sure
236 * we have a copy of this last block */
239 memcpy(&(ctx->buf[0]),&(in[inl]),b);
241 if (ctx->buf_len != 0)
251 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
257 b=ctx->cipher->block_size;
260 if (ctx->buf_len != b)
262 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
265 if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
271 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
276 if (ctx->buf[--b] != n)
278 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
282 n=ctx->cipher->block_size-n;
292 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
294 if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
296 if(!c->cipher->cleanup(c)) return 0;
298 memset(c,0,sizeof(EVP_CIPHER_CTX));
302 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
304 if(c->key_len == keylen) return 1;
305 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
310 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);