mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
4cffafe967
Reviewed-by: Dr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: Rich Salz <rsalz@openssl.org> Fixes: #4641 GH: #4665
645 lines
18 KiB
C
645 lines
18 KiB
C
/*
|
|
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* 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 <assert.h>
|
|
#include "internal/cryptlib.h"
|
|
#include <openssl/evp.h>
|
|
#include <openssl/err.h>
|
|
#include <openssl/rand.h>
|
|
#include <openssl/rand_drbg.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)
|
|
{
|
|
if (cipher != NULL)
|
|
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) {
|
|
ctx->cipher = 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)) {
|
|
ctx->cipher = 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)
|
|
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, which means that
|
|
* difference between two pointers might be truncated to 32 bits.
|
|
* In the context one can even wonder how comparison for
|
|
* equality is implemented. To be on the safe side we adhere to
|
|
* PTRDIFF_T even for comparison for equality.
|
|
*/
|
|
# define PTRDIFF_T uint64_t
|
|
#else
|
|
# define PTRDIFF_T size_t
|
|
#endif
|
|
|
|
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 overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
|
|
(diff > (0 - (PTRDIFF_T)len)));
|
|
|
|
return overlapped;
|
|
}
|
|
|
|
int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
|
|
const unsigned char *in, int inl)
|
|
{
|
|
int i, j, bl, cmpl = inl;
|
|
|
|
if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
|
|
cmpl = (cmpl + 7) / 8;
|
|
|
|
bl = ctx->cipher->block_size;
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
|
/* If block size > 1 then the cipher will have to do this check */
|
|
if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
|
|
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 (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 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;
|
|
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);
|
|
inl -= j;
|
|
in += j;
|
|
if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
|
|
return 0;
|
|
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, cmpl = inl;
|
|
unsigned int b;
|
|
|
|
b = ctx->cipher->block_size;
|
|
|
|
if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
|
|
cmpl = (cmpl + 7) / 8;
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
|
if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
OPENSSL_assert(b <= sizeof(ctx->final));
|
|
|
|
if (ctx->final_used) {
|
|
/* see comment about PTRDIFF_T comparison above */
|
|
if (((PTRDIFF_T)out == (PTRDIFF_T)in)
|
|
|| is_partially_overlapping(out, in, b)) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
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 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_priv_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) {
|
|
out->cipher = 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)
|
|
if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
|
|
out->cipher = NULL;
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|