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openssl/crypto/evp/evp_enc.c
Pauli f3a7e6c057 evp: process key length and iv length early if present 
evp_cipher_init_internal() takes a params array argument and this is processed
late in the initialisation process for some ciphers (AEAD ones).

This means that changing the IV length as a parameter will either truncate the
IV (very bad if SP 800-38d section 8.2.1 is used) or grab extra uninitialised
bytes.

Truncation is very bad if SP 800-38d section 8.2.1 is being used to
contruct a deterministic IV.  This leads to an instant loss of confidentiality.

Grabbing extra bytes isn't so serious, it will most likely result in a bad
decryption.

Problem reported by Tony Battersby of Cybernetics.com but earlier discovered
and raised as issue #19822.

Fixes CVE-2023-5363
Fixes #19822

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
2023-10-24 14:32:24 +01:00

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/*
* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include <stdio.h>
#include <limits.h>
#include <assert.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#ifndef FIPS_MODULE
# include <openssl/engine.h>
#endif
#include <openssl/params.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "internal/provider.h"
#include "internal/core.h"
#include "internal/safe_math.h"
#include "crypto/evp.h"
#include "evp_local.h"
OSSL_SAFE_MATH_SIGNED(int, int)
int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
{
if (ctx == NULL)
return 1;
if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
goto legacy;
if (ctx->algctx != NULL) {
if (ctx->cipher->freectx != NULL)
ctx->cipher->freectx(ctx->algctx);
ctx->algctx = NULL;
}
if (ctx->fetched_cipher != NULL)
EVP_CIPHER_free(ctx->fetched_cipher);
memset(ctx, 0, sizeof(*ctx));
ctx->iv_len = -1;
return 1;
/* Remove legacy code below when legacy support is removed. */
legacy:
if (ctx->cipher != NULL) {
if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
return 0;
/* Cleanse cipher context data */
if (ctx->cipher_data && ctx->cipher->ctx_size)
OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
}
OPENSSL_free(ctx->cipher_data);
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
ENGINE_finish(ctx->engine);
#endif
memset(ctx, 0, sizeof(*ctx));
ctx->iv_len = -1;
return 1;
}
EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
{
EVP_CIPHER_CTX *ctx;
ctx = OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
if (ctx == NULL)
return NULL;
ctx->iv_len = -1;
return ctx;
}
void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
{
if (ctx == NULL)
return;
EVP_CIPHER_CTX_reset(ctx);
OPENSSL_free(ctx);
}
static int evp_cipher_init_internal(EVP_CIPHER_CTX *ctx,
const EVP_CIPHER *cipher,
ENGINE *impl, const unsigned char *key,
const unsigned char *iv, int enc,
const OSSL_PARAM params[])
{
int n;
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
ENGINE *tmpimpl = NULL;
#endif
/*
* enc == 1 means we are encrypting.
* enc == 0 means we are decrypting.
* enc == -1 means, use the previously initialised value for encrypt/decrypt
*/
if (enc == -1) {
enc = ctx->encrypt;
} else {
if (enc)
enc = 1;
ctx->encrypt = enc;
}
if (cipher == NULL && ctx->cipher == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
return 0;
}
/* Code below to be removed when legacy support is dropped. */
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
/*
* 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;
if (cipher != NULL && impl == NULL) {
/* Ask if an ENGINE is reserved for this job */
tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
}
#endif
/*
* If there are engines involved then we should use legacy handling for now.
*/
if (ctx->engine != NULL
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
|| tmpimpl != NULL
#endif
|| impl != NULL
|| (cipher != NULL && cipher->origin == EVP_ORIG_METH)
|| (cipher == NULL && ctx->cipher != NULL
&& ctx->cipher->origin == EVP_ORIG_METH)) {
if (ctx->cipher == ctx->fetched_cipher)
ctx->cipher = NULL;
EVP_CIPHER_free(ctx->fetched_cipher);
ctx->fetched_cipher = NULL;
goto legacy;
}
/*
* Ensure a context left lying around from last time is cleared
* (legacy code)
*/
if (cipher != NULL && ctx->cipher != NULL) {
if (ctx->cipher->cleanup != NULL && !ctx->cipher->cleanup(ctx))
return 0;
OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
ctx->cipher_data = NULL;
}
/* Start of non-legacy code below */
/* Ensure a context left lying around from last time is cleared */
if (cipher != NULL && ctx->cipher != NULL) {
unsigned long flags = ctx->flags;
EVP_CIPHER_CTX_reset(ctx);
/* Restore encrypt and flags */
ctx->encrypt = enc;
ctx->flags = flags;
}
if (cipher == NULL)
cipher = ctx->cipher;
if (cipher->prov == NULL) {
#ifdef FIPS_MODULE
/* We only do explicit fetches inside the FIPS module */
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
#else
EVP_CIPHER *provciph =
EVP_CIPHER_fetch(NULL,
cipher->nid == NID_undef ? "NULL"
: OBJ_nid2sn(cipher->nid),
"");
if (provciph == NULL)
return 0;
cipher = provciph;
EVP_CIPHER_free(ctx->fetched_cipher);
ctx->fetched_cipher = provciph;
#endif
}
if (!ossl_assert(cipher->prov != NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
if (cipher != ctx->fetched_cipher) {
if (!EVP_CIPHER_up_ref((EVP_CIPHER *)cipher)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
EVP_CIPHER_free(ctx->fetched_cipher);
/* Coverity false positive, the reference counting is confusing it */
/* coverity[use_after_free] */
ctx->fetched_cipher = (EVP_CIPHER *)cipher;
}
ctx->cipher = cipher;
if (ctx->algctx == NULL) {
ctx->algctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
if (ctx->algctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
/*
* If this ctx was already set up for no padding then we need to tell
* the new cipher about it.
*/
if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
return 0;
}
#ifndef FIPS_MODULE
/*
* Fix for CVE-2023-5363
* Passing in a size as part of the init call takes effect late
* so, force such to occur before the initialisation.
*
* The FIPS provider's internal library context is used in a manner
* such that this is not an issue.
*/
if (params != NULL) {
OSSL_PARAM param_lens[3] = { OSSL_PARAM_END, OSSL_PARAM_END,
OSSL_PARAM_END };
OSSL_PARAM *q = param_lens;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL)
memcpy(q++, p, sizeof(*q));
/*
* Note that OSSL_CIPHER_PARAM_AEAD_IVLEN is a synomym for
* OSSL_CIPHER_PARAM_IVLEN so both are covered here.
*/
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
if (p != NULL)
memcpy(q++, p, sizeof(*q));
if (q != param_lens) {
if (!EVP_CIPHER_CTX_set_params(ctx, param_lens)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_LENGTH);
return 0;
}
}
}
#endif
if (enc) {
if (ctx->cipher->einit == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
return ctx->cipher->einit(ctx->algctx,
key,
key == NULL ? 0
: EVP_CIPHER_CTX_get_key_length(ctx),
iv,
iv == NULL ? 0
: EVP_CIPHER_CTX_get_iv_length(ctx),
params);
}
if (ctx->cipher->dinit == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
return ctx->cipher->dinit(ctx->algctx,
key,
key == NULL ? 0
: EVP_CIPHER_CTX_get_key_length(ctx),
iv,
iv == NULL ? 0
: EVP_CIPHER_CTX_get_iv_length(ctx),
params);
/* Code below to be removed when legacy support is dropped. */
legacy:
if (cipher != NULL) {
/*
* Ensure a context left lying around from last time is cleared (we
* previously 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;
}
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
if (impl != NULL) {
if (!ENGINE_init(impl)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
} else {
impl = tmpimpl;
}
if (impl != NULL) {
/* There's an ENGINE for this job ... (apparently) */
const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
if (c == NULL) {
/*
* 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"?
*/
ERR_raise(ERR_LIB_EVP, 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;
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) <= 0) {
ctx->cipher = NULL;
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
}
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
skip_to_init:
#endif
if (ctx->cipher == NULL)
return 0;
/* 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_get_mode(ctx) == EVP_CIPH_WRAP_MODE) {
ERR_raise(ERR_LIB_EVP, EVP_R_WRAP_MODE_NOT_ALLOWED);
return 0;
}
if ((EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(ctx))
& EVP_CIPH_CUSTOM_IV) == 0) {
switch (EVP_CIPHER_CTX_get_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:
n = EVP_CIPHER_CTX_get_iv_length(ctx);
if (n < 0 || n > (int)sizeof(ctx->iv)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_IV_LENGTH);
return 0;
}
if (iv != NULL)
memcpy(ctx->oiv, iv, n);
memcpy(ctx->iv, ctx->oiv, n);
break;
case EVP_CIPH_CTR_MODE:
ctx->num = 0;
/* Don't reuse IV for CTR mode */
if (iv != NULL) {
n = EVP_CIPHER_CTX_get_iv_length(ctx);
if (n <= 0 || n > (int)sizeof(ctx->iv)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_IV_LENGTH);
return 0;
}
memcpy(ctx->iv, iv, n);
}
break;
default:
return 0;
}
}
if (key != NULL || (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_CipherInit_ex2(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv,
int enc, const OSSL_PARAM params[])
{
return evp_cipher_init_internal(ctx, cipher, NULL, key, iv, enc, params);
}
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_cipher_init_internal(ctx, cipher, NULL, key, iv, enc, NULL);
}
int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
ENGINE *impl, const unsigned char *key,
const unsigned char *iv, int enc)
{
return evp_cipher_init_internal(ctx, cipher, impl, key, iv, enc, NULL);
}
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_EncryptInit_ex2(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv,
const OSSL_PARAM params[])
{
return EVP_CipherInit_ex2(ctx, cipher, key, iv, 1, params);
}
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_DecryptInit_ex2(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv,
const OSSL_PARAM params[])
{
return EVP_CipherInit_ex2(ctx, cipher, key, iv, 0, params);
}
/*
* 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 ossl_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;
}
static int evp_EncryptDecryptUpdate(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 = safe_div_round_up_int(cmpl, 8, NULL);
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 && ossl_is_partially_overlapping(out, in, cmpl)) {
ERR_raise(ERR_LIB_EVP, 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 (ossl_is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
ERR_raise(ERR_LIB_EVP, 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;
/*
* Once we've processed the first j bytes from in, the amount of
* data left that is a multiple of the block length is:
* (inl - j) & ~(bl - 1)
* We must ensure that this amount of data, plus the one block that
* we process from ctx->buf does not exceed INT_MAX
*/
if (((inl - j) & ~(bl - 1)) > INT_MAX - bl) {
ERR_raise(ERR_LIB_EVP, EVP_R_OUTPUT_WOULD_OVERFLOW);
return 0;
}
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_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
const unsigned char *in, int inl)
{
int ret;
size_t soutl, inl_ = (size_t)inl;
int blocksize;
if (likely(outl != NULL)) {
*outl = 0;
} else {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* Prevent accidental use of decryption context when encrypting */
if (unlikely(!ctx->encrypt)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (unlikely(ctx->cipher == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
return 0;
}
if (unlikely(ctx->cipher->prov == NULL))
goto legacy;
blocksize = ctx->cipher->block_size;
if (unlikely(ctx->cipher->cupdate == NULL || blocksize < 1)) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
ret = ctx->cipher->cupdate(ctx->algctx, out, &soutl,
inl_ + (size_t)(blocksize == 1 ? 0 : blocksize),
in, inl_);
if (likely(ret)) {
if (soutl > INT_MAX) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
*outl = soutl;
}
return ret;
/* Code below to be removed when legacy support is dropped. */
legacy:
return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
}
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;
size_t soutl;
int blocksize;
if (outl != NULL) {
*outl = 0;
} else {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* Prevent accidental use of decryption context when encrypting */
if (!ctx->encrypt) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (ctx->cipher == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
return 0;
}
if (ctx->cipher->prov == NULL)
goto legacy;
blocksize = EVP_CIPHER_CTX_get_block_size(ctx);
if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
ret = ctx->cipher->cfinal(ctx->algctx, out, &soutl,
blocksize == 1 ? 0 : blocksize);
if (ret) {
if (soutl > INT_MAX) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
*outl = soutl;
}
return ret;
/* Code below to be removed when legacy support is dropped. */
legacy:
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) {
ERR_raise(ERR_LIB_EVP, 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, ret;
unsigned int b;
size_t soutl, inl_ = (size_t)inl;
int blocksize;
if (likely(outl != NULL)) {
*outl = 0;
} else {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* Prevent accidental use of encryption context when decrypting */
if (unlikely(ctx->encrypt)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (unlikely(ctx->cipher == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
return 0;
}
if (unlikely(ctx->cipher->prov == NULL))
goto legacy;
blocksize = EVP_CIPHER_CTX_get_block_size(ctx);
if (unlikely(ctx->cipher->cupdate == NULL || blocksize < 1)) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
ret = ctx->cipher->cupdate(ctx->algctx, out, &soutl,
inl_ + (size_t)(blocksize == 1 ? 0 : blocksize),
in, inl_);
if (likely(ret)) {
if (soutl > INT_MAX) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
*outl = soutl;
}
return ret;
/* Code below to be removed when legacy support is dropped. */
legacy:
b = ctx->cipher->block_size;
if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
cmpl = safe_div_round_up_int(cmpl, 8, NULL);
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
if (b == 1 && ossl_is_partially_overlapping(out, in, cmpl)) {
ERR_raise(ERR_LIB_EVP, 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_EncryptDecryptUpdate(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)
|| ossl_is_partially_overlapping(out, in, b)) {
ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);
return 0;
}
/*
* final_used is only ever set if buf_len is 0. Therefore the maximum
* length output we will ever see from evp_EncryptDecryptUpdate is
* the maximum multiple of the block length that is <= inl, or just:
* inl & ~(b - 1)
* Since final_used has been set then the final output length is:
* (inl & ~(b - 1)) + b
* This must never exceed INT_MAX
*/
if ((inl & ~(b - 1)) > INT_MAX - b) {
ERR_raise(ERR_LIB_EVP, EVP_R_OUTPUT_WOULD_OVERFLOW);
return 0;
}
memcpy(out, ctx->final, b);
out += b;
fix_len = 1;
} else
fix_len = 0;
if (!evp_EncryptDecryptUpdate(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;
size_t soutl;
int ret;
int blocksize;
if (outl != NULL) {
*outl = 0;
} else {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* Prevent accidental use of encryption context when decrypting */
if (ctx->encrypt) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (ctx->cipher == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
return 0;
}
if (ctx->cipher->prov == NULL)
goto legacy;
blocksize = EVP_CIPHER_CTX_get_block_size(ctx);
if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
ret = ctx->cipher->cfinal(ctx->algctx, out, &soutl,
blocksize == 1 ? 0 : blocksize);
if (ret) {
if (soutl > INT_MAX) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
*outl = soutl;
}
return ret;
/* Code below to be removed when legacy support is dropped. */
legacy:
*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) {
ERR_raise(ERR_LIB_EVP, EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
return 0;
}
*outl = 0;
return 1;
}
if (b > 1) {
if (ctx->buf_len || !ctx->final_used) {
ERR_raise(ERR_LIB_EVP, 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) {
ERR_raise(ERR_LIB_EVP, EVP_R_BAD_DECRYPT);
return 0;
}
for (i = 0; i < n; i++) {
if (ctx->final[--b] != n) {
ERR_raise(ERR_LIB_EVP, 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->prov != NULL) {
int ok;
OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
size_t len;
if (EVP_CIPHER_CTX_get_key_length(c) == keylen)
return 1;
/* Check the cipher actually understands this parameter */
if (OSSL_PARAM_locate_const(EVP_CIPHER_settable_ctx_params(c->cipher),
OSSL_CIPHER_PARAM_KEYLEN) == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
return 0;
}
params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
if (!OSSL_PARAM_set_int(params, keylen))
return 0;
ok = evp_do_ciph_ctx_setparams(c->cipher, c->algctx, params);
if (ok <= 0)
return 0;
c->key_len = keylen;
return 1;
}
/* Code below to be removed when legacy support is dropped. */
/*
* Note there have never been any built-in ciphers that define this flag
* since it was first introduced.
*/
if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
if (EVP_CIPHER_CTX_get_key_length(c) == keylen)
return 1;
if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
c->key_len = keylen;
return 1;
}
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
return 0;
}
int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
{
int ok;
OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
unsigned int pd = pad;
if (pad)
ctx->flags &= ~EVP_CIPH_NO_PADDING;
else
ctx->flags |= EVP_CIPH_NO_PADDING;
if (ctx->cipher != NULL && ctx->cipher->prov == NULL)
return 1;
params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
return ok != 0;
}
int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
int ret = EVP_CTRL_RET_UNSUPPORTED;
int set_params = 1;
size_t sz = arg;
unsigned int i;
OSSL_PARAM params[4] = {
OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
};
if (ctx == NULL || ctx->cipher == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
return 0;
}
if (ctx->cipher->prov == NULL)
goto legacy;
switch (type) {
case EVP_CTRL_SET_KEY_LENGTH:
if (arg < 0)
return 0;
if (ctx->key_len == arg)
/* Skip calling into provider if unchanged. */
return 1;
params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
ctx->key_len = -1;
break;
case EVP_CTRL_RAND_KEY: /* Used by DES */
set_params = 0;
params[0] =
OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
ptr, sz);
break;
case EVP_CTRL_INIT:
/*
* EVP_CTRL_INIT is purely legacy, no provider counterpart.
* As a matter of fact, this should be dead code, but some caller
* might still do a direct control call with this command, so...
* Legacy methods return 1 except for exceptional circumstances, so
* we do the same here to not be disruptive.
*/
return 1;
case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
default:
goto end;
case EVP_CTRL_AEAD_SET_IVLEN:
if (arg < 0)
return 0;
if (ctx->iv_len == arg)
/* Skip calling into provider if unchanged. */
return 1;
params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
ctx->iv_len = -1;
break;
case EVP_CTRL_CCM_SET_L:
if (arg < 2 || arg > 8)
return 0;
sz = 15 - arg;
params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
ctx->iv_len = -1;
break;
case EVP_CTRL_AEAD_SET_IV_FIXED:
params[0] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED, ptr, sz);
break;
case EVP_CTRL_GCM_IV_GEN:
set_params = 0;
if (arg < 0)
sz = 0; /* special case that uses the iv length */
params[0] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN, ptr, sz);
break;
case EVP_CTRL_GCM_SET_IV_INV:
if (arg < 0)
return 0;
params[0] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_AEAD_TLS1_SET_IV_INV, ptr, sz);
break;
case EVP_CTRL_GET_RC5_ROUNDS:
set_params = 0; /* Fall thru */
case EVP_CTRL_SET_RC5_ROUNDS:
if (arg < 0)
return 0;
i = (unsigned int)arg;
params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
break;
case EVP_CTRL_SET_SPEED:
if (arg < 0)
return 0;
i = (unsigned int)arg;
params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
break;
case EVP_CTRL_AEAD_GET_TAG:
set_params = 0; /* Fall thru */
case EVP_CTRL_AEAD_SET_TAG:
params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
ptr, sz);
break;
case EVP_CTRL_AEAD_TLS1_AAD:
/* This one does a set and a get - since it returns a size */
params[0] =
OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
ptr, sz);
ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
goto end;
params[0] =
OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
goto end;
return sz;
#ifndef OPENSSL_NO_RC2
case EVP_CTRL_GET_RC2_KEY_BITS:
set_params = 0; /* Fall thru */
case EVP_CTRL_SET_RC2_KEY_BITS:
params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
break;
#endif /* OPENSSL_NO_RC2 */
#if !defined(OPENSSL_NO_MULTIBLOCK)
case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE:
params[0] = OSSL_PARAM_construct_size_t(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT, &sz);
ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
return 0;
params[0] = OSSL_PARAM_construct_size_t(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE, &sz);
params[1] = OSSL_PARAM_construct_end();
ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
return 0;
return sz;
case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD: {
EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
if (arg < (int)sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM))
return 0;
params[0] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD, (void*)p->inp, p->len);
params[1] = OSSL_PARAM_construct_uint(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
return ret;
/* Retrieve the return values changed by the set */
params[0] = OSSL_PARAM_construct_size_t(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN, &sz);
params[1] = OSSL_PARAM_construct_uint(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
params[2] = OSSL_PARAM_construct_end();
ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
return 0;
return sz;
}
case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT: {
EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
params[0] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC, p->out, p->len);
params[1] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN, (void*)p->inp,
p->len);
params[2] = OSSL_PARAM_construct_uint(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
return ret;
params[0] = OSSL_PARAM_construct_size_t(
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN, &sz);
params[1] = OSSL_PARAM_construct_end();
ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
if (ret <= 0)
return 0;
return sz;
}
#endif /* OPENSSL_NO_MULTIBLOCK */
case EVP_CTRL_AEAD_SET_MAC_KEY:
if (arg < 0)
return -1;
params[0] = OSSL_PARAM_construct_octet_string(
OSSL_CIPHER_PARAM_AEAD_MAC_KEY, ptr, sz);
break;
}
if (set_params)
ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
else
ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
goto end;
/* Code below to be removed when legacy support is dropped. */
legacy:
if (ctx->cipher->ctrl == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
end:
if (ret == EVP_CTRL_RET_UNSUPPORTED) {
ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
return 0;
}
return ret;
}
int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
{
if (cipher != NULL && cipher->get_params != NULL)
return cipher->get_params(params);
return 0;
}
int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
{
int r = 0;
const OSSL_PARAM *p;
if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL) {
r = ctx->cipher->set_ctx_params(ctx->algctx, params);
if (r > 0) {
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->key_len)) {
r = 0;
ctx->key_len = -1;
}
}
if (r > 0) {
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->iv_len)) {
r = 0;
ctx->iv_len = -1;
}
}
}
return r;
}
int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
{
if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
return ctx->cipher->get_ctx_params(ctx->algctx, params);
return 0;
}
const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
{
if (cipher != NULL && cipher->gettable_params != NULL)
return cipher->gettable_params(
ossl_provider_ctx(EVP_CIPHER_get0_provider(cipher)));
return NULL;
}
const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
{
void *provctx;
if (cipher != NULL && cipher->settable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_CIPHER_get0_provider(cipher));
return cipher->settable_ctx_params(NULL, provctx);
}
return NULL;
}
const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
{
void *provctx;
if (cipher != NULL && cipher->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_CIPHER_get0_provider(cipher));
return cipher->gettable_ctx_params(NULL, provctx);
}
return NULL;
}
const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(EVP_CIPHER_CTX *cctx)
{
void *alg;
if (cctx != NULL && cctx->cipher->settable_ctx_params != NULL) {
alg = ossl_provider_ctx(EVP_CIPHER_get0_provider(cctx->cipher));
return cctx->cipher->settable_ctx_params(cctx->algctx, alg);
}
return NULL;
}
const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(EVP_CIPHER_CTX *cctx)
{
void *provctx;
if (cctx != NULL && cctx->cipher->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_CIPHER_get0_provider(cctx->cipher));
return cctx->cipher->gettable_ctx_params(cctx->algctx, provctx);
}
return NULL;
}
#ifndef FIPS_MODULE
static OSSL_LIB_CTX *EVP_CIPHER_CTX_get_libctx(EVP_CIPHER_CTX *ctx)
{
const EVP_CIPHER *cipher = ctx->cipher;
const OSSL_PROVIDER *prov;
if (cipher == NULL)
return NULL;
prov = EVP_CIPHER_get0_provider(cipher);
return ossl_provider_libctx(prov);
}
#endif
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);
#ifdef FIPS_MODULE
return 0;
#else
{
int kl;
OSSL_LIB_CTX *libctx = EVP_CIPHER_CTX_get_libctx(ctx);
kl = EVP_CIPHER_CTX_get_key_length(ctx);
if (kl <= 0 || RAND_priv_bytes_ex(libctx, key, kl, 0) <= 0)
return 0;
return 1;
}
#endif /* FIPS_MODULE */
}
EVP_CIPHER_CTX *EVP_CIPHER_CTX_dup(const EVP_CIPHER_CTX *in)
{
EVP_CIPHER_CTX *out = EVP_CIPHER_CTX_new();
if (out != NULL && !EVP_CIPHER_CTX_copy(out, in)) {
EVP_CIPHER_CTX_free(out);
out = NULL;
}
return out;
}
int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
{
if ((in == NULL) || (in->cipher == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INPUT_NOT_INITIALIZED);
return 0;
}
if (in->cipher->prov == NULL)
goto legacy;
if (in->cipher->dupctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
return 0;
}
EVP_CIPHER_CTX_reset(out);
*out = *in;
out->algctx = NULL;
if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
out->fetched_cipher = NULL;
return 0;
}
out->algctx = in->cipher->dupctx(in->algctx);
if (out->algctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
return 0;
}
return 1;
/* Code below to be removed when legacy support is dropped. */
legacy:
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
/* Make sure it's safe to copy a cipher context using an ENGINE */
if (in->engine && !ENGINE_init(in->engine)) {
ERR_raise(ERR_LIB_EVP, 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;
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;
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
return 1;
}
EVP_CIPHER *evp_cipher_new(void)
{
EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
if (cipher != NULL && !CRYPTO_NEW_REF(&cipher->refcnt, 1)) {
OPENSSL_free(cipher);
return NULL;
}
return cipher;
}
/*
* FIPS module note: since internal fetches will be entirely
* provider based, we know that none of its code depends on legacy
* NIDs or any functionality that use them.
*/
#ifndef FIPS_MODULE
/* After removal of legacy support get rid of the need for legacy NIDs */
static void set_legacy_nid(const char *name, void *vlegacy_nid)
{
int nid;
int *legacy_nid = vlegacy_nid;
/*
* We use lowest level function to get the associated method, because
* higher level functions such as EVP_get_cipherbyname() have changed
* to look at providers too.
*/
const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
if (*legacy_nid == -1) /* We found a clash already */
return;
if (legacy_method == NULL)
return;
nid = EVP_CIPHER_get_nid(legacy_method);
if (*legacy_nid != NID_undef && *legacy_nid != nid) {
*legacy_nid = -1;
return;
}
*legacy_nid = nid;
}
#endif
static void *evp_cipher_from_algorithm(const int name_id,
const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov)
{
const OSSL_DISPATCH *fns = algodef->implementation;
EVP_CIPHER *cipher = NULL;
int fnciphcnt = 0, fnctxcnt = 0;
if ((cipher = evp_cipher_new()) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
return NULL;
}
#ifndef FIPS_MODULE
cipher->nid = NID_undef;
if (!evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid)
|| cipher->nid == -1) {
ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
EVP_CIPHER_free(cipher);
return NULL;
}
#endif
cipher->name_id = name_id;
if ((cipher->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
EVP_CIPHER_free(cipher);
return NULL;
}
cipher->description = algodef->algorithm_description;
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_CIPHER_NEWCTX:
if (cipher->newctx != NULL)
break;
cipher->newctx = OSSL_FUNC_cipher_newctx(fns);
fnctxcnt++;
break;
case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
if (cipher->einit != NULL)
break;
cipher->einit = OSSL_FUNC_cipher_encrypt_init(fns);
fnciphcnt++;
break;
case OSSL_FUNC_CIPHER_DECRYPT_INIT:
if (cipher->dinit != NULL)
break;
cipher->dinit = OSSL_FUNC_cipher_decrypt_init(fns);
fnciphcnt++;
break;
case OSSL_FUNC_CIPHER_UPDATE:
if (cipher->cupdate != NULL)
break;
cipher->cupdate = OSSL_FUNC_cipher_update(fns);
fnciphcnt++;
break;
case OSSL_FUNC_CIPHER_FINAL:
if (cipher->cfinal != NULL)
break;
cipher->cfinal = OSSL_FUNC_cipher_final(fns);
fnciphcnt++;
break;
case OSSL_FUNC_CIPHER_CIPHER:
if (cipher->ccipher != NULL)
break;
cipher->ccipher = OSSL_FUNC_cipher_cipher(fns);
break;
case OSSL_FUNC_CIPHER_FREECTX:
if (cipher->freectx != NULL)
break;
cipher->freectx = OSSL_FUNC_cipher_freectx(fns);
fnctxcnt++;
break;
case OSSL_FUNC_CIPHER_DUPCTX:
if (cipher->dupctx != NULL)
break;
cipher->dupctx = OSSL_FUNC_cipher_dupctx(fns);
break;
case OSSL_FUNC_CIPHER_GET_PARAMS:
if (cipher->get_params != NULL)
break;
cipher->get_params = OSSL_FUNC_cipher_get_params(fns);
break;
case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
if (cipher->get_ctx_params != NULL)
break;
cipher->get_ctx_params = OSSL_FUNC_cipher_get_ctx_params(fns);
break;
case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
if (cipher->set_ctx_params != NULL)
break;
cipher->set_ctx_params = OSSL_FUNC_cipher_set_ctx_params(fns);
break;
case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
if (cipher->gettable_params != NULL)
break;
cipher->gettable_params = OSSL_FUNC_cipher_gettable_params(fns);
break;
case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
if (cipher->gettable_ctx_params != NULL)
break;
cipher->gettable_ctx_params =
OSSL_FUNC_cipher_gettable_ctx_params(fns);
break;
case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
if (cipher->settable_ctx_params != NULL)
break;
cipher->settable_ctx_params =
OSSL_FUNC_cipher_settable_ctx_params(fns);
break;
}
}
if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
|| (fnciphcnt == 0 && cipher->ccipher == NULL)
|| fnctxcnt != 2) {
/*
* In order to be a consistent set of functions we must have at least
* a complete set of "encrypt" functions, or a complete set of "decrypt"
* functions, or a single "cipher" function. In all cases we need both
* the "newctx" and "freectx" functions.
*/
EVP_CIPHER_free(cipher);
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
return NULL;
}
cipher->prov = prov;
if (prov != NULL)
ossl_provider_up_ref(prov);
if (!evp_cipher_cache_constants(cipher)) {
EVP_CIPHER_free(cipher);
ERR_raise(ERR_LIB_EVP, EVP_R_CACHE_CONSTANTS_FAILED);
cipher = NULL;
}
return cipher;
}
static int evp_cipher_up_ref(void *cipher)
{
return EVP_CIPHER_up_ref(cipher);
}
static void evp_cipher_free(void *cipher)
{
EVP_CIPHER_free(cipher);
}
EVP_CIPHER *EVP_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
const char *properties)
{
EVP_CIPHER *cipher =
evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
evp_cipher_from_algorithm, evp_cipher_up_ref,
evp_cipher_free);
return cipher;
}
int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
{
int ref = 0;
if (cipher->origin == EVP_ORIG_DYNAMIC)
CRYPTO_UP_REF(&cipher->refcnt, &ref);
return 1;
}
void evp_cipher_free_int(EVP_CIPHER *cipher)
{
OPENSSL_free(cipher->type_name);
ossl_provider_free(cipher->prov);
CRYPTO_FREE_REF(&cipher->refcnt);
OPENSSL_free(cipher);
}
void EVP_CIPHER_free(EVP_CIPHER *cipher)
{
int i;
if (cipher == NULL || cipher->origin != EVP_ORIG_DYNAMIC)
return;
CRYPTO_DOWN_REF(&cipher->refcnt, &i);
if (i > 0)
return;
evp_cipher_free_int(cipher);
}
void EVP_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(EVP_CIPHER *mac, void *arg),
void *arg)
{
evp_generic_do_all(libctx, OSSL_OP_CIPHER,
(void (*)(void *, void *))fn, arg,
evp_cipher_from_algorithm, evp_cipher_up_ref,
evp_cipher_free);
}
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