-/* crypto/evp/evp_enc.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
#include <stdio.h>
-#include "cryptlib.h"
-#include "evp.h"
-
-const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
-
-void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
- {
- memset(ctx,0,sizeof(EVP_CIPHER_CTX));
- /* ctx->cipher=NULL; */
- }
-
-void EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *data,
- unsigned char *key, unsigned char *iv, int enc)
- {
- if (enc)
- EVP_EncryptInit(ctx,data,key,iv);
- else
- EVP_DecryptInit(ctx,data,key,iv);
- }
-
-void EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
- unsigned char *in, int inl)
- {
- if (ctx->encrypt)
- EVP_EncryptUpdate(ctx,out,outl,in,inl);
- else EVP_DecryptUpdate(ctx,out,outl,in,inl);
- }
+#include <assert.h>
+#include "internal/cryptlib.h"
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#include <openssl/engine.h>
+#include "internal/evp_int.h"
+#include "evp_locl.h"
+
+int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c)
+{
+ if (c == NULL)
+ return 1;
+ if (c->cipher != NULL) {
+ if (c->cipher->cleanup && !c->cipher->cleanup(c))
+ return 0;
+ /* Cleanse cipher context data */
+ if (c->cipher_data && c->cipher->ctx_size)
+ OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
+ }
+ OPENSSL_free(c->cipher_data);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(c->engine);
+#endif
+ memset(c, 0, sizeof(*c));
+ return 1;
+}
+
+EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
+{
+ return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
+}
+
+void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
+{
+ EVP_CIPHER_CTX_reset(ctx);
+ OPENSSL_free(ctx);
+}
+
+int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key, const unsigned char *iv, int enc)
+{
+ EVP_CIPHER_CTX_reset(ctx);
+ return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
+}
+
+int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ ENGINE *impl, const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ if (enc == -1)
+ enc = ctx->encrypt;
+ else {
+ if (enc)
+ enc = 1;
+ ctx->encrypt = enc;
+ }
+#ifndef OPENSSL_NO_ENGINE
+ /*
+ * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
+ * this context may already have an ENGINE! Try to avoid releasing the
+ * previous handle, re-querying for an ENGINE, and having a
+ * reinitialisation, when it may all be unnecessary.
+ */
+ if (ctx->engine && ctx->cipher
+ && (cipher == NULL || cipher->nid == ctx->cipher->nid))
+ goto skip_to_init;
+#endif
+ if (cipher) {
+ /*
+ * Ensure a context left lying around from last time is cleared (the
+ * previous check attempted to avoid this if the same ENGINE and
+ * EVP_CIPHER could be used).
+ */
+ if (ctx->cipher) {
+ unsigned long flags = ctx->flags;
+ EVP_CIPHER_CTX_reset(ctx);
+ /* Restore encrypt and flags */
+ ctx->encrypt = enc;
+ ctx->flags = flags;
+ }
+#ifndef OPENSSL_NO_ENGINE
+ if (impl) {
+ if (!ENGINE_init(impl)) {
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ } else
+ /* Ask if an ENGINE is reserved for this job */
+ impl = ENGINE_get_cipher_engine(cipher->nid);
+ if (impl) {
+ /* There's an ENGINE for this job ... (apparently) */
+ const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
+ if (!c) {
+ /*
+ * One positive side-effect of US's export control history,
+ * is that we should at least be able to avoid using US
+ * misspellings of "initialisation"?
+ */
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ /* We'll use the ENGINE's private cipher definition */
+ cipher = c;
+ /*
+ * Store the ENGINE functional reference so we know 'cipher' came
+ * from an ENGINE and we need to release it when done.
+ */
+ ctx->engine = impl;
+ } else
+ ctx->engine = NULL;
+#endif
+
+ ctx->cipher = cipher;
+ if (ctx->cipher->ctx_size) {
+ ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
+ if (ctx->cipher_data == NULL) {
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ } else {
+ ctx->cipher_data = NULL;
+ }
+ ctx->key_len = cipher->key_len;
+ /* Preserve wrap enable flag, zero everything else */
+ ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
+ if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
+ if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ }
+ } else if (!ctx->cipher) {
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
+ return 0;
+ }
+#ifndef OPENSSL_NO_ENGINE
+ skip_to_init:
+#endif
+ /* we assume block size is a power of 2 in *cryptUpdate */
+ OPENSSL_assert(ctx->cipher->block_size == 1
+ || ctx->cipher->block_size == 8
+ || ctx->cipher->block_size == 16);
+
+ if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
+ && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
+ return 0;
+ }
+
+ if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
+ switch (EVP_CIPHER_CTX_mode(ctx)) {
+
+ case EVP_CIPH_STREAM_CIPHER:
+ case EVP_CIPH_ECB_MODE:
+ break;
+
+ case EVP_CIPH_CFB_MODE:
+ case EVP_CIPH_OFB_MODE:
+
+ ctx->num = 0;
+ /* fall-through */
+
+ case EVP_CIPH_CBC_MODE:
+
+ OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
+ (int)sizeof(ctx->iv));
+ if (iv)
+ memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
+ memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
+ break;
+
+ case EVP_CIPH_CTR_MODE:
+ ctx->num = 0;
+ /* Don't reuse IV for CTR mode */
+ if (iv)
+ memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
+ break;
+
+ default:
+ return 0;
+ }
+ }
+
+ if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
+ if (!ctx->cipher->init(ctx, key, iv, enc))
+ return 0;
+ }
+ ctx->buf_len = 0;
+ ctx->final_used = 0;
+ ctx->block_mask = ctx->cipher->block_size - 1;
+ return 1;
+}
+
+int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
+ const unsigned char *in, int inl)
+{
+ if (ctx->encrypt)
+ return EVP_EncryptUpdate(ctx, out, outl, in, inl);
+ else
+ return EVP_DecryptUpdate(ctx, out, outl, in, inl);
+}
+
+int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ if (ctx->encrypt)
+ return EVP_EncryptFinal_ex(ctx, out, outl);
+ else
+ return EVP_DecryptFinal_ex(ctx, out, outl);
+}
int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
- {
- if (ctx->encrypt)
- {
- EVP_EncryptFinal(ctx,out,outl);
- return(1);
- }
- else return(EVP_DecryptFinal(ctx,out,outl));
- }
-
-void EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- unsigned char *key, unsigned char *iv)
- {
- if (cipher != NULL)
- ctx->cipher=cipher;
- ctx->cipher->init(ctx,key,iv,1);
- ctx->encrypt=1;
- ctx->buf_len=0;
- }
-
-void EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- unsigned char *key, unsigned char *iv)
- {
- if (cipher != NULL)
- ctx->cipher=cipher;
- ctx->cipher->init(ctx,key,iv,0);
- ctx->encrypt=0;
- ctx->buf_len=0;
- }
-
-
-void EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
- unsigned char *in, int inl)
- {
- int i,j,bl;
-
- i=ctx->buf_len;
- bl=ctx->cipher->block_size;
- *outl=0;
- if ((inl == 0) && (i != bl)) return;
- if (i != 0)
- {
- if (i+inl < bl)
- {
- memcpy(&(ctx->buf[i]),in,inl);
- ctx->buf_len+=inl;
- return;
- }
- else
- {
- j=bl-i;
- if (j != 0) memcpy(&(ctx->buf[i]),in,j);
- ctx->cipher->do_cipher(ctx,out,ctx->buf,bl);
- inl-=j;
- in+=j;
- out+=bl;
- *outl+=bl;
- }
- }
- i=inl%bl; /* how much is left */
- inl-=i;
- if (inl > 0)
- {
- ctx->cipher->do_cipher(ctx,out,in,inl);
- *outl+=inl;
- }
-
- if (i != 0)
- memcpy(ctx->buf,&(in[inl]),i);
- ctx->buf_len=i;
- }
-
-void EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
- {
- int i,n,b,bl;
-
- b=ctx->cipher->block_size;
- if (b == 1)
- {
- *outl=0;
- return;
- }
- bl=ctx->buf_len;
- n=b-bl;
- for (i=bl; i<b; i++)
- ctx->buf[i]=n;
- ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
- *outl=b;
- }
-
-void EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
- unsigned char *in, int inl)
- {
- int b,bl,n;
- int keep_last=0;
-
- *outl=0;
- if (inl == 0) return;
-
- b=ctx->cipher->block_size;
- if (b > 1)
- {
- /* Is the input a multiple of the block size? */
- bl=ctx->buf_len;
- n=inl+bl;
- if (n%b == 0)
- {
- if (inl < b) /* must be 'just one' buff */
- {
- memcpy(&(ctx->buf[bl]),in,inl);
- ctx->buf_len=b;
- *outl=0;
- return;
- }
- keep_last=1;
- inl-=b; /* don't do the last block */
- }
- }
- EVP_EncryptUpdate(ctx,out,outl,in,inl);
-
- /* if we have 'decrypted' a multiple of block size, make sure
- * we have a copy of this last block */
- if (keep_last)
- {
- memcpy(&(ctx->buf[0]),&(in[inl]),b);
-#ifdef DEBUG
- if (ctx->buf_len != 0)
- {
- abort();
- }
+{
+ if (ctx->encrypt)
+ return EVP_EncryptFinal(ctx, out, outl);
+ else
+ return EVP_DecryptFinal(ctx, out, outl);
+}
+
+int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key, const unsigned char *iv)
+{
+ return EVP_CipherInit(ctx, cipher, key, iv, 1);
+}
+
+int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ ENGINE *impl, const unsigned char *key,
+ const unsigned char *iv)
+{
+ return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
+}
+
+int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key, const unsigned char *iv)
+{
+ return EVP_CipherInit(ctx, cipher, key, iv, 0);
+}
+
+int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ ENGINE *impl, const unsigned char *key,
+ const unsigned char *iv)
+{
+ return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
+}
+
+/*
+ * According to the letter of standard difference between pointers
+ * is specified to be valid only within same object. This makes
+ * it formally challenging to determine if input and output buffers
+ * are not partially overlapping with standard pointer arithmetic.
+ */
+#ifdef PTRDIFF_T
+# undef PTRDIFF_T
+#endif
+#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
+/*
+ * Then we have VMS that distinguishes itself by adhering to
+ * sizeof(size_t)==4 even in 64-bit builds...
+ */
+# define PTRDIFF_T uint64_t
+#else
+# define PTRDIFF_T size_t
#endif
- ctx->buf_len=b;
- }
- }
+
+static int is_partially_overlapping(const void *ptr1, const void *ptr2,
+ int len)
+{
+ PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
+ /*
+ * Check for partially overlapping buffers. [Binary logical
+ * operations are used instead of boolean to minimize number
+ * of conditional branches.]
+ */
+ int condition = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
+ (diff > (0 - (PTRDIFF_T)len)));
+ assert(!condition);
+ return condition;
+}
+
+int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
+ const unsigned char *in, int inl)
+{
+ int i, j, bl;
+
+ if (is_partially_overlapping(out, in, inl))
+ return 0;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ i = ctx->cipher->do_cipher(ctx, out, in, inl);
+ if (i < 0)
+ return 0;
+ else
+ *outl = i;
+ return 1;
+ }
+
+ if (inl <= 0) {
+ *outl = 0;
+ return inl == 0;
+ }
+
+ if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
+ if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
+ *outl = inl;
+ return 1;
+ } else {
+ *outl = 0;
+ return 0;
+ }
+ }
+ i = ctx->buf_len;
+ bl = ctx->cipher->block_size;
+ OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
+ if (i != 0) {
+ if (bl - i > inl) {
+ memcpy(&(ctx->buf[i]), in, inl);
+ ctx->buf_len += inl;
+ *outl = 0;
+ return 1;
+ } else {
+ j = bl - i;
+ memcpy(&(ctx->buf[i]), in, j);
+ if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
+ return 0;
+ inl -= j;
+ in += j;
+ out += bl;
+ *outl = bl;
+ }
+ } else
+ *outl = 0;
+ i = inl & (bl - 1);
+ inl -= i;
+ if (inl > 0) {
+ if (!ctx->cipher->do_cipher(ctx, out, in, inl))
+ return 0;
+ *outl += inl;
+ }
+
+ if (i != 0)
+ memcpy(ctx->buf, &(in[inl]), i);
+ ctx->buf_len = i;
+ return 1;
+}
+
+int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int ret;
+ ret = EVP_EncryptFinal_ex(ctx, out, outl);
+ return ret;
+}
+
+int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int n, ret;
+ unsigned int i, b, bl;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
+ if (ret < 0)
+ return 0;
+ else
+ *outl = ret;
+ return 1;
+ }
+
+ b = ctx->cipher->block_size;
+ OPENSSL_assert(b <= sizeof ctx->buf);
+ if (b == 1) {
+ *outl = 0;
+ return 1;
+ }
+ bl = ctx->buf_len;
+ if (ctx->flags & EVP_CIPH_NO_PADDING) {
+ if (bl) {
+ EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
+ EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
+
+ n = b - bl;
+ for (i = bl; i < b; i++)
+ ctx->buf[i] = n;
+ ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
+
+ if (ret)
+ *outl = b;
+
+ return ret;
+}
+
+int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
+ const unsigned char *in, int inl)
+{
+ int fix_len;
+ unsigned int b;
+
+ if (is_partially_overlapping(out, in, inl))
+ return 0;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
+ if (fix_len < 0) {
+ *outl = 0;
+ return 0;
+ } else
+ *outl = fix_len;
+ return 1;
+ }
+
+ if (inl <= 0) {
+ *outl = 0;
+ return inl == 0;
+ }
+
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ return EVP_EncryptUpdate(ctx, out, outl, in, inl);
+
+ b = ctx->cipher->block_size;
+ OPENSSL_assert(b <= sizeof ctx->final);
+
+ if (ctx->final_used) {
+ memcpy(out, ctx->final, b);
+ out += b;
+ fix_len = 1;
+ } else
+ fix_len = 0;
+
+ if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
+ return 0;
+
+ /*
+ * if we have 'decrypted' a multiple of block size, make sure we have a
+ * copy of this last block
+ */
+ if (b > 1 && !ctx->buf_len) {
+ *outl -= b;
+ ctx->final_used = 1;
+ memcpy(ctx->final, &out[*outl], b);
+ } else
+ ctx->final_used = 0;
+
+ if (fix_len)
+ *outl += b;
+
+ return 1;
+}
int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
- {
- int i,b;
- int n;
-
- *outl=0;
- b=ctx->cipher->block_size;
- if (b > 1)
- {
- if (ctx->buf_len != b)
- {
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
- return(0);
- }
- EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0);
- if (n != b)
- return(0);
- n=ctx->buf[b-1];
- if (n > b)
- {
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
- return(0);
- }
- for (i=0; i<n; i++)
- {
- if (ctx->buf[--b] != n)
- {
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
- return(0);
- }
- }
- n=ctx->cipher->block_size-n;
- for (i=0; i<n; i++)
- out[i]=ctx->buf[i];
- *outl=n;
- }
- else
- *outl=0;
- return(1);
- }
-
-void EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
- {
- if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
- c->cipher->cleanup(c);
- memset(c,0,sizeof(EVP_CIPHER_CTX));
- }
+{
+ int ret;
+ ret = EVP_DecryptFinal_ex(ctx, out, outl);
+ return ret;
+}
+
+int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int i, n;
+ unsigned int b;
+ *outl = 0;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
+ if (i < 0)
+ return 0;
+ else
+ *outl = i;
+ return 1;
+ }
+
+ b = ctx->cipher->block_size;
+ if (ctx->flags & EVP_CIPH_NO_PADDING) {
+ if (ctx->buf_len) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
+ EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
+ if (b > 1) {
+ if (ctx->buf_len || !ctx->final_used) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
+ return (0);
+ }
+ OPENSSL_assert(b <= sizeof ctx->final);
+
+ /*
+ * The following assumes that the ciphertext has been authenticated.
+ * Otherwise it provides a padding oracle.
+ */
+ n = ctx->final[b - 1];
+ if (n == 0 || n > (int)b) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
+ return (0);
+ }
+ for (i = 0; i < n; i++) {
+ if (ctx->final[--b] != n) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
+ return (0);
+ }
+ }
+ n = ctx->cipher->block_size - n;
+ for (i = 0; i < n; i++)
+ out[i] = ctx->final[i];
+ *outl = n;
+ } else
+ *outl = 0;
+ return (1);
+}
+
+int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
+{
+ if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
+ return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
+ if (c->key_len == keylen)
+ return 1;
+ if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
+ c->key_len = keylen;
+ return 1;
+ }
+ EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
+ return 0;
+}
+
+int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
+{
+ if (pad)
+ ctx->flags &= ~EVP_CIPH_NO_PADDING;
+ else
+ ctx->flags |= EVP_CIPH_NO_PADDING;
+ return 1;
+}
+
+int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
+{
+ int ret;
+ if (!ctx->cipher) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
+ return 0;
+ }
+
+ if (!ctx->cipher->ctrl) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
+ return 0;
+ }
+
+ ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
+ if (ret == -1) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
+ EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
+ return 0;
+ }
+ return ret;
+}
+
+int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
+{
+ if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
+ return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
+ if (RAND_bytes(key, ctx->key_len) <= 0)
+ return 0;
+ return 1;
+}
+
+int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
+{
+ if ((in == NULL) || (in->cipher == NULL)) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
+ return 0;
+ }
+#ifndef OPENSSL_NO_ENGINE
+ /* Make sure it's safe to copy a cipher context using an ENGINE */
+ if (in->engine && !ENGINE_init(in->engine)) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
+ return 0;
+ }
+#endif
+
+ EVP_CIPHER_CTX_reset(out);
+ memcpy(out, in, sizeof(*out));
+
+ if (in->cipher_data && in->cipher->ctx_size) {
+ out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
+ if (out->cipher_data == NULL) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
+ }
+ if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
+ return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
+ return 1;
+}
projects / openssl.git / blobdiff