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>
63 #include <openssl/rand.h>
64 #ifndef OPENSSL_NO_ENGINE
65 #include <openssl/engine.h>
70 #define M_do_cipher(ctx, out, in, inl) \
71 EVP_Cipher(ctx,out,in,inl)
73 #define M_do_cipher(ctx, out, in, inl) \
74 ctx->cipher->do_cipher(ctx,out,in,inl)
77 const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
79 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
81 EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
83 EVP_CIPHER_CTX_init(ctx);
87 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
88 const unsigned char *key, const unsigned char *iv, int enc)
91 EVP_CIPHER_CTX_init(ctx);
92 return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
95 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
96 const unsigned char *in, int inl)
99 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
100 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
103 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
106 return EVP_EncryptFinal_ex(ctx,out,outl);
107 else return EVP_DecryptFinal_ex(ctx,out,outl);
110 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
113 return EVP_EncryptFinal(ctx,out,outl);
114 else return EVP_DecryptFinal(ctx,out,outl);
117 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
118 const unsigned char *key, const unsigned char *iv)
120 return EVP_CipherInit(ctx, cipher, key, iv, 1);
123 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
124 const unsigned char *key, const unsigned char *iv)
126 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
129 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
130 const unsigned char *key, const unsigned char *iv)
132 return EVP_CipherInit(ctx, cipher, key, iv, 0);
135 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
136 const unsigned char *key, const unsigned char *iv)
138 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
141 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
142 const unsigned char *in, int inl)
152 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
154 if(M_do_cipher(ctx,out,in,inl))
166 bl=ctx->cipher->block_size;
167 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
172 memcpy(&(ctx->buf[i]),in,inl);
180 memcpy(&(ctx->buf[i]),in,j);
181 if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0;
194 if(!M_do_cipher(ctx,out,in,inl)) return 0;
199 memcpy(ctx->buf,&(in[inl]),i);
204 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
207 ret = EVP_EncryptFinal_ex(ctx, out, outl);
211 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
214 unsigned int i, b, bl;
216 b=ctx->cipher->block_size;
217 OPENSSL_assert(b <= sizeof ctx->buf);
224 if (ctx->flags & EVP_CIPH_NO_PADDING)
228 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
238 ret=M_do_cipher(ctx,out,ctx->buf,b);
247 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
248 const unsigned char *in, int inl)
259 if (ctx->flags & EVP_CIPH_NO_PADDING)
260 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
262 b=ctx->cipher->block_size;
263 OPENSSL_assert(b <= sizeof ctx->final);
267 memcpy(out,ctx->final,b);
275 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
278 /* if we have 'decrypted' a multiple of block size, make sure
279 * we have a copy of this last block */
280 if (b > 1 && !ctx->buf_len)
284 memcpy(ctx->final,&out[*outl],b);
295 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
298 ret = EVP_DecryptFinal_ex(ctx, out, outl);
302 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
308 b=ctx->cipher->block_size;
309 if (ctx->flags & EVP_CIPH_NO_PADDING)
313 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
321 if (ctx->buf_len || !ctx->final_used)
323 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
326 OPENSSL_assert(b <= sizeof ctx->final);
328 if (n == 0 || n > (int)b)
330 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
335 if (ctx->final[--b] != n)
337 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
341 n=ctx->cipher->block_size-n;
343 out[i]=ctx->final[i];
351 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
355 EVP_CIPHER_CTX_cleanup(ctx);
360 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
362 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
363 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
364 if(c->key_len == keylen) return 1;
365 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
370 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
374 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
376 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
377 else ctx->flags |= EVP_CIPH_NO_PADDING;
381 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
383 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
384 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
385 if (RAND_bytes(key, ctx->key_len) <= 0)
390 #ifndef OPENSSL_NO_ENGINE
394 static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
398 if (!ENGINE_init(impl))
400 EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
405 /* Ask if an ENGINE is reserved for this job */
406 impl = ENGINE_get_cipher_engine((*pcipher)->nid);
409 /* There's an ENGINE for this job ... (apparently) */
410 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
413 /* One positive side-effect of US's export
414 * control history, is that we should at least
415 * be able to avoid using US mispellings of
416 * "initialisation"? */
417 EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
420 /* We'll use the ENGINE's private cipher definition */
422 /* Store the ENGINE functional reference so we know
423 * 'cipher' came from an ENGINE and we need to release
432 void int_EVP_CIPHER_init_engine_callbacks(void)
434 int_EVP_CIPHER_set_engine_callbacks(
435 ENGINE_finish, do_evp_enc_engine_full);