pineapple/externals/libressl/crypto/evp/evp_enc.c
2020-12-28 15:15:37 +00:00

695 lines
16 KiB
C
Executable file

/* $OpenBSD: evp_enc.c,v 1.43 2019/04/14 17:16:57 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* 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.]
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <openssl/opensslconf.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include "evp_locl.h"
#define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl)
int
EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv, int enc)
{
if (cipher)
EVP_CIPHER_CTX_init(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 unecessary. */
if (ctx->engine && ctx->cipher &&
(!cipher || (cipher && (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_cleanup(ctx);
/* Restore encrypt and flags */
ctx->encrypt = enc;
ctx->flags = flags;
}
#ifndef OPENSSL_NO_ENGINE
if (impl) {
if (!ENGINE_init(impl)) {
EVPerror(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) {
EVPerror(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 = calloc(1, ctx->cipher->ctx_size);
if (ctx->cipher_data == NULL) {
EVPerror(ERR_R_MALLOC_FAILURE);
return 0;
}
} else {
ctx->cipher_data = NULL;
}
ctx->key_len = cipher->key_len;
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)) {
EVPerror(EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
} else if (!ctx->cipher) {
EVPerror(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 */
if (ctx->cipher->block_size != 1 &&
ctx->cipher->block_size != 8 &&
ctx->cipher->block_size != 16) {
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
return 0;
}
if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) &&
EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
EVPerror(EVP_R_WRAP_MODE_NOT_ALLOWED);
return 0;
}
if (!(EVP_CIPHER_CTX_flags(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:
if ((size_t)EVP_CIPHER_CTX_iv_length(ctx) >
sizeof(ctx->iv)) {
EVPerror(EVP_R_IV_TOO_LARGE);
return 0;
}
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;
break;
}
}
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);
}
__warn_references(EVP_CipherFinal,
"EVP_CipherFinal is often misused, please use EVP_CipherFinal_ex and EVP_CIPHER_CTX_cleanup");
int
EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
int ret;
if (ctx->encrypt)
ret = EVP_EncryptFinal_ex(ctx, out, outl);
else
ret = EVP_DecryptFinal_ex(ctx, out, outl);
return ret;
}
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);
}
int
EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
const unsigned char *in, int inl)
{
int i, j, bl;
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
i = M_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 (M_do_cipher(ctx, out, in, inl)) {
*outl = inl;
return 1;
} else {
*outl = 0;
return 0;
}
}
i = ctx->buf_len;
bl = ctx->cipher->block_size;
if ((size_t)bl > sizeof(ctx->buf)) {
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
*outl = 0;
return 0;
}
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 (!M_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 (!M_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;
}
__warn_references(EVP_EncryptFinal,
"EVP_EncryptFinal is often misused, please use EVP_EncryptFinal_ex and EVP_CIPHER_CTX_cleanup");
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 = M_do_cipher(ctx, out, NULL, 0);
if (ret < 0)
return 0;
else
*outl = ret;
return 1;
}
b = ctx->cipher->block_size;
if (b > sizeof ctx->buf) {
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
return 0;
}
if (b == 1) {
*outl = 0;
return 1;
}
bl = ctx->buf_len;
if (ctx->flags & EVP_CIPH_NO_PADDING) {
if (bl) {
EVPerror(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 = M_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 (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
fix_len = M_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;
if (b > sizeof ctx->final) {
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
return 0;
}
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;
}
__warn_references(EVP_DecryptFinal,
"EVP_DecryptFinal is often misused, please use EVP_DecryptFinal_ex and EVP_CIPHER_CTX_cleanup");
int
EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
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 = M_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) {
EVPerror(EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
return 0;
}
*outl = 0;
return 1;
}
if (b > 1) {
if (ctx->buf_len || !ctx->final_used) {
EVPerror(EVP_R_WRONG_FINAL_BLOCK_LENGTH);
return (0);
}
if (b > sizeof ctx->final) {
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
return 0;
}
n = ctx->final[b - 1];
if (n == 0 || n > (int)b) {
EVPerror(EVP_R_BAD_DECRYPT);
return (0);
}
for (i = 0; i < n; i++) {
if (ctx->final[--b] != n) {
EVPerror(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);
}
EVP_CIPHER_CTX *
EVP_CIPHER_CTX_new(void)
{
return calloc(1, sizeof(EVP_CIPHER_CTX));
}
void
EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
{
if (ctx == NULL)
return;
EVP_CIPHER_CTX_cleanup(ctx);
free(ctx);
}
void
EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
{
memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
}
int
EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *a)
{
return EVP_CIPHER_CTX_cleanup(a);
}
int
EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
{
if (c->cipher != NULL) {
if (c->cipher->cleanup && !c->cipher->cleanup(c))
return 0;
/* Cleanse cipher context data */
if (c->cipher_data)
explicit_bzero(c->cipher_data, c->cipher->ctx_size);
}
/* XXX - store size of cipher_data so we can always freezero(). */
free(c->cipher_data);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(c->engine);
#endif
explicit_bzero(c, sizeof(EVP_CIPHER_CTX));
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;
}
EVPerror(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) {
EVPerror(EVP_R_NO_CIPHER_SET);
return 0;
}
if (!ctx->cipher->ctrl) {
EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
if (ret == -1) {
EVPerror(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);
arc4random_buf(key, ctx->key_len);
return 1;
}
int
EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
{
if ((in == NULL) || (in->cipher == NULL)) {
EVPerror(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)) {
EVPerror(ERR_R_ENGINE_LIB);
return 0;
}
#endif
EVP_CIPHER_CTX_cleanup(out);
memcpy(out, in, sizeof *out);
if (in->cipher_data && in->cipher->ctx_size) {
out->cipher_data = calloc(1, in->cipher->ctx_size);
if (out->cipher_data == NULL) {
EVPerror(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) {
if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY,
0, out)) {
/*
* If the custom copy control failed, assume that there
* may still be pointers copied in the cipher_data that
* we do not own. This may result in a leak from a bad
* custom copy control, but that's preferable to a
* double free...
*/
freezero(out->cipher_data, in->cipher->ctx_size);
out->cipher_data = NULL;
return 0;
}
}
return 1;
}