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>
63 const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
65 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
67 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
68 /* ctx->cipher=NULL; */
71 void EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *data,
72 unsigned char *key, unsigned char *iv, int enc)
75 EVP_EncryptInit(ctx,data,key,iv);
77 EVP_DecryptInit(ctx,data,key,iv);
80 void EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
81 unsigned char *in, int inl)
84 EVP_EncryptUpdate(ctx,out,outl,in,inl);
85 else EVP_DecryptUpdate(ctx,out,outl,in,inl);
88 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
92 EVP_EncryptFinal(ctx,out,outl);
95 else return(EVP_DecryptFinal(ctx,out,outl));
98 void EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
99 unsigned char *key, unsigned char *iv)
103 ctx->cipher->init(ctx,key,iv,1);
108 void EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
109 unsigned char *key, unsigned char *iv)
113 ctx->cipher->init(ctx,key,iv,0);
119 void EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
120 unsigned char *in, int inl)
125 bl=ctx->cipher->block_size;
127 if ((inl == 0) && (i != bl)) return;
132 memcpy(&(ctx->buf[i]),in,inl);
139 if (j != 0) memcpy(&(ctx->buf[i]),in,j);
140 ctx->cipher->do_cipher(ctx,out,ctx->buf,bl);
147 i=inl%bl; /* how much is left */
151 ctx->cipher->do_cipher(ctx,out,in,inl);
156 memcpy(ctx->buf,&(in[inl]),i);
160 void EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
164 b=ctx->cipher->block_size;
174 ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
178 void EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
179 unsigned char *in, int inl)
185 if (inl == 0) return;
187 b=ctx->cipher->block_size;
190 /* Is the input a multiple of the block size? */
195 if (inl < b) /* must be 'just one' buff */
197 memcpy(&(ctx->buf[bl]),in,inl);
203 inl-=b; /* don't do the last block */
206 EVP_EncryptUpdate(ctx,out,outl,in,inl);
208 /* if we have 'decrypted' a multiple of block size, make sure
209 * we have a copy of this last block */
212 memcpy(&(ctx->buf[0]),&(in[inl]),b);
214 if (ctx->buf_len != 0)
223 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
229 b=ctx->cipher->block_size;
232 if (ctx->buf_len != b)
234 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
237 EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0);
243 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
248 if (ctx->buf[--b] != n)
250 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
254 n=ctx->cipher->block_size-n;
264 void EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
266 if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
267 c->cipher->cleanup(c);
268 memset(c,0,sizeof(EVP_CIPHER_CTX));