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/*
* Copyright 2019 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
*/
#include <openssl/params.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/evp.h>
#include "internal/cryptlib.h"
#include "crypto/modes.h"
#include "crypto/ciphermode_platform.h"
#define MAXCHUNK ((size_t)1 << (sizeof(long) * 8 - 2))
#define MAXBITCHUNK ((size_t)1 << (sizeof(size_t) * 8 - 4))
#define GENERIC_BLOCK_SIZE 16
#define IV_STATE_UNINITIALISED 0 /* initial state is not initialized */
#define IV_STATE_BUFFERED 1 /* iv has been copied to the iv buffer */
#define IV_STATE_COPIED 2 /* iv has been copied from the iv buffer */
#define IV_STATE_FINISHED 3 /* the iv has been used - so don't reuse it */
#define PROV_CIPHER_FUNC(type, name, args) typedef type (* OSSL_##name##_fn)args
typedef struct prov_cipher_hw_st PROV_CIPHER_HW;
typedef struct prov_cipher_ctx_st PROV_CIPHER_CTX;
typedef int (PROV_CIPHER_HW_FN)(PROV_CIPHER_CTX *dat, unsigned char *out,
const unsigned char *in, size_t len);
struct prov_cipher_ctx_st {
block128_f block;
union {
cbc128_f cbc;
ctr128_f ctr;
} stream;
unsigned int mode;
size_t keylen; /* key size (in bytes) */
size_t ivlen;
size_t blocksize;
size_t bufsz; /* Number of bytes in buf */
unsigned int pad : 1; /* Whether padding should be used or not */
unsigned int enc : 1; /* Set to 1 for encrypt, or 0 otherwise */
unsigned int iv_set : 1; /* Set when the iv is copied to the iv/oiv buffers */
/*
* num contains the number of bytes of |iv| which are valid for modes that
* manage partial blocks themselves.
*/
unsigned int num;
uint64_t flags;
/* The original value of the iv */
unsigned char oiv[GENERIC_BLOCK_SIZE];
/* Buffer of partial blocks processed via update calls */
unsigned char buf[GENERIC_BLOCK_SIZE];
unsigned char iv[GENERIC_BLOCK_SIZE];
const PROV_CIPHER_HW *hw; /* hardware specific functions */
const void *ks; /* Pointer to algorithm specific key data */
OPENSSL_CTX *libctx;
};
struct prov_cipher_hw_st {
int (*init)(PROV_CIPHER_CTX *dat, const uint8_t *key, size_t keylen);
PROV_CIPHER_HW_FN *cipher;
};
OSSL_OP_cipher_encrypt_init_fn cipher_generic_einit;
OSSL_OP_cipher_decrypt_init_fn cipher_generic_dinit;
OSSL_OP_cipher_update_fn cipher_generic_block_update;
OSSL_OP_cipher_final_fn cipher_generic_block_final;
OSSL_OP_cipher_update_fn cipher_generic_stream_update;
OSSL_OP_cipher_final_fn cipher_generic_stream_final;
OSSL_OP_cipher_cipher_fn cipher_generic_cipher;
OSSL_OP_cipher_get_ctx_params_fn cipher_generic_get_ctx_params;
OSSL_OP_cipher_set_ctx_params_fn cipher_generic_set_ctx_params;
OSSL_OP_cipher_gettable_params_fn cipher_generic_gettable_params;
OSSL_OP_cipher_gettable_ctx_params_fn cipher_generic_gettable_ctx_params;
OSSL_OP_cipher_settable_ctx_params_fn cipher_generic_settable_ctx_params;
OSSL_OP_cipher_gettable_ctx_params_fn cipher_aead_gettable_ctx_params;
OSSL_OP_cipher_settable_ctx_params_fn cipher_aead_settable_ctx_params;
int cipher_generic_get_params(OSSL_PARAM params[], unsigned int md,
unsigned long flags,
size_t kbits, size_t blkbits, size_t ivbits);
void cipher_generic_initkey(void *vctx, size_t kbits, size_t blkbits,
size_t ivbits, unsigned int mode, uint64_t flags,
const PROV_CIPHER_HW *hw, void *provctx);
#define IMPLEMENT_generic_cipher_func(alg, UCALG, lcmode, UCMODE, flags, kbits,\
blkbits, ivbits, typ) \
const OSSL_DISPATCH alg##kbits##lcmode##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, \
(void (*)(void)) alg##_##kbits##_##lcmode##_newctx }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))cipher_generic_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))cipher_generic_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))cipher_generic_##typ##_update },\
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))cipher_generic_##typ##_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))cipher_generic_cipher }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
(void (*)(void)) alg##_##kbits##_##lcmode##_get_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void))cipher_generic_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void))cipher_generic_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))cipher_generic_gettable_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void))cipher_generic_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void))cipher_generic_settable_ctx_params }, \
{ 0, NULL } \
};
#define IMPLEMENT_generic_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits, \
blkbits, ivbits, typ) \
static OSSL_OP_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params; \
static int alg##_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
{ \
return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, flags, \
kbits, blkbits, ivbits); \
} \
static OSSL_OP_cipher_newctx_fn alg##_##kbits##_##lcmode##_newctx; \
static void * alg##_##kbits##_##lcmode##_newctx(void *provctx) \
{ \
PROV_##UCALG##_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); \
if (ctx != NULL) { \
cipher_generic_initkey(ctx, kbits, blkbits, ivbits, \
EVP_CIPH_##UCMODE##_MODE, flags, \
PROV_CIPHER_HW_##alg##_##lcmode(kbits), NULL); \
} \
return ctx; \
} \
IMPLEMENT_generic_cipher_func(alg, UCALG, lcmode, UCMODE, flags, kbits, \
blkbits, ivbits, typ)
PROV_CIPHER_HW_FN cipher_hw_generic_cbc;
PROV_CIPHER_HW_FN cipher_hw_generic_ecb;
PROV_CIPHER_HW_FN cipher_hw_generic_ofb128;
PROV_CIPHER_HW_FN cipher_hw_generic_cfb128;
PROV_CIPHER_HW_FN cipher_hw_generic_cfb8;
PROV_CIPHER_HW_FN cipher_hw_generic_cfb1;
PROV_CIPHER_HW_FN cipher_hw_generic_ctr;
PROV_CIPHER_HW_FN cipher_hw_chunked_cbc;
PROV_CIPHER_HW_FN cipher_hw_chunked_cfb8;
PROV_CIPHER_HW_FN cipher_hw_chunked_cfb128;
PROV_CIPHER_HW_FN cipher_hw_chunked_ofb128;
#define cipher_hw_chunked_ecb cipher_hw_generic_ecb
#define cipher_hw_chunked_ctr cipher_hw_generic_ctr
#define cipher_hw_chunked_cfb1 cipher_hw_generic_cfb1
#define IMPLEMENT_CIPHER_HW_OFB(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
unsigned char *out, \
const unsigned char *in, size_t len) \
{ \
int num = ctx->num; \
KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
\
while (len >= MAXCHUNK) { \
FUNC_PREFIX##_encrypt(in, out, MAXCHUNK, key, ctx->iv, &num); \
len -= MAXCHUNK; \
in += MAXCHUNK; \
out += MAXCHUNK; \
} \
if (len > 0) { \
FUNC_PREFIX##_encrypt(in, out, (long)len, key, ctx->iv, &num); \
} \
ctx->num = num; \
return 1; \
}
#define IMPLEMENT_CIPHER_HW_ECB(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
unsigned char *out, \
const unsigned char *in, size_t len) \
{ \
size_t i, bl = ctx->blocksize; \
KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
\
if (len < bl) \
return 1; \
for (i = 0, len -= bl; i <= len; i += bl) \
FUNC_PREFIX##_encrypt(in + i, out + i, key, ctx->enc); \
return 1; \
}
#define IMPLEMENT_CIPHER_HW_CBC(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
unsigned char *out, \
const unsigned char *in, size_t len) \
{ \
KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
\
while (len >= MAXCHUNK) { \
FUNC_PREFIX##_encrypt(in, out, MAXCHUNK, key, ctx->iv, ctx->enc); \
len -= MAXCHUNK; \
in += MAXCHUNK; \
out += MAXCHUNK; \
} \
if (len > 0) \
FUNC_PREFIX##_encrypt(in, out, (long)len, key, ctx->iv, ctx->enc); \
return 1; \
}
#define IMPLEMENT_CIPHER_HW_CFB(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
unsigned char *out, \
const unsigned char *in, size_t len) \
{ \
size_t chunk = MAXCHUNK; \
KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
int num = ctx->num; \
\
if (len < chunk) \
chunk = len; \
while (len > 0 && len >= chunk) { \
FUNC_PREFIX##_encrypt(in, out, (long)chunk, key, ctx->iv, &num, \
ctx->enc); \
len -= chunk; \
in += chunk; \
out += chunk; \
if (len < chunk) \
chunk = len; \
} \
ctx->num = num; \
return 1; \
}
#define CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(name) \
static const OSSL_PARAM name##_known_gettable_ctx_params[] = { \
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), \
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL), \
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_PADDING, NULL), \
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_NUM, NULL), \
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_IV, NULL, 0),
#define CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(name) \
OSSL_PARAM_END \
}; \
const OSSL_PARAM * name##_gettable_ctx_params(void) \
{ \
return name##_known_gettable_ctx_params; \
}
#define CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(name) \
static const OSSL_PARAM name##_known_settable_ctx_params[] = { \
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), \
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_PADDING, NULL), \
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_NUM, NULL),
#define CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(name) \
OSSL_PARAM_END \
}; \
const OSSL_PARAM * name##_settable_ctx_params(void) \
{ \
return name##_known_settable_ctx_params; \
}
int cipher_generic_initiv(PROV_CIPHER_CTX *ctx, const unsigned char *iv,
size_t ivlen);
size_t fillblock(unsigned char *buf, size_t *buflen, size_t blocksize,
const unsigned char **in, size_t *inlen);
int trailingdata(unsigned char *buf, size_t *buflen, size_t blocksize,
const unsigned char **in, size_t *inlen);
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