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);
101 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
104 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
107 return EVP_EncryptFinal_ex(ctx, out, outl);
109 return EVP_DecryptFinal_ex(ctx, out, outl);
112 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
115 return EVP_EncryptFinal(ctx, out, outl);
117 return EVP_DecryptFinal(ctx, out, outl);
120 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
121 const unsigned char *key, const unsigned char *iv)
123 return EVP_CipherInit(ctx, cipher, key, iv, 1);
126 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
127 ENGINE *impl, const unsigned char *key,
128 const unsigned char *iv)
130 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
133 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
134 const unsigned char *key, const unsigned char *iv)
136 return EVP_CipherInit(ctx, cipher, key, iv, 0);
139 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
140 ENGINE *impl, const unsigned char *key,
141 const unsigned char *iv)
143 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
146 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
147 const unsigned char *in, int inl)
156 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
157 if (M_do_cipher(ctx, out, in, inl)) {
166 bl = ctx->cipher->block_size;
167 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
170 memcpy(&(ctx->buf[i]), in, inl);
176 memcpy(&(ctx->buf[i]), in, j);
177 if (!M_do_cipher(ctx, out, ctx->buf, bl))
189 if (!M_do_cipher(ctx, out, in, inl))
195 memcpy(ctx->buf, &(in[inl]), i);
200 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
203 ret = EVP_EncryptFinal_ex(ctx, out, outl);
207 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
210 unsigned int i, b, bl;
212 b = ctx->cipher->block_size;
213 OPENSSL_assert(b <= sizeof ctx->buf);
219 if (ctx->flags & EVP_CIPH_NO_PADDING) {
221 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
222 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
230 for (i = bl; i < b; i++)
232 ret = M_do_cipher(ctx, out, ctx->buf, b);
240 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
241 const unsigned char *in, int inl)
251 if (ctx->flags & EVP_CIPH_NO_PADDING)
252 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
254 b = ctx->cipher->block_size;
255 OPENSSL_assert(b <= sizeof ctx->final);
257 if (ctx->final_used) {
258 memcpy(out, ctx->final, b);
264 if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
268 * if we have 'decrypted' a multiple of block size, make sure we have a
269 * copy of this last block
271 if (b > 1 && !ctx->buf_len) {
274 memcpy(ctx->final, &out[*outl], b);
284 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
287 ret = EVP_DecryptFinal_ex(ctx, out, outl);
291 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
297 b = ctx->cipher->block_size;
298 if (ctx->flags & EVP_CIPH_NO_PADDING) {
300 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
301 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
308 if (ctx->buf_len || !ctx->final_used) {
309 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
312 OPENSSL_assert(b <= sizeof ctx->final);
313 n = ctx->final[b - 1];
314 if (n == 0 || n > (int)b) {
315 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
318 for (i = 0; i < n; i++) {
319 if (ctx->final[--b] != n) {
320 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
324 n = ctx->cipher->block_size - n;
325 for (i = 0; i < n; i++)
326 out[i] = ctx->final[i];
333 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
336 EVP_CIPHER_CTX_cleanup(ctx);
341 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
343 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
344 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
345 if (c->key_len == keylen)
347 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
351 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
355 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
358 ctx->flags &= ~EVP_CIPH_NO_PADDING;
360 ctx->flags |= EVP_CIPH_NO_PADDING;
364 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
366 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
367 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
368 if (RAND_bytes(key, ctx->key_len) <= 0)
373 #ifndef OPENSSL_NO_ENGINE
377 static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx,
378 const EVP_CIPHER **pcipher, ENGINE *impl)
381 if (!ENGINE_init(impl)) {
382 EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
386 /* Ask if an ENGINE is reserved for this job */
387 impl = ENGINE_get_cipher_engine((*pcipher)->nid);
389 /* There's an ENGINE for this job ... (apparently) */
390 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
393 * One positive side-effect of US's export control history, is
394 * that we should at least be able to avoid using US mispellings
395 * of "initialisation"?
397 EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
400 /* We'll use the ENGINE's private cipher definition */
403 * Store the ENGINE functional reference so we know 'cipher' came
404 * from an ENGINE and we need to release it when done.
412 void int_EVP_CIPHER_init_engine_callbacks(void)
414 int_EVP_CIPHER_set_engine_callbacks(ENGINE_finish,
415 do_evp_enc_engine_full);