+++ /dev/null
-/*
- * 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 "cipher_aes_xts.h"
-#include "internal/provider_algs.h"
-#include "internal/providercommonerr.h"
-
-/* TODO (3.0) Figure out what flags need to be set */
-#define AES_XTS_FLAGS (EVP_CIPH_CUSTOM_IV \
- | EVP_CIPH_ALWAYS_CALL_INIT \
- | EVP_CIPH_CTRL_INIT \
- | EVP_CIPH_CUSTOM_COPY)
-
-#define AES_XTS_IV_BITS 128
-#define AES_XTS_BLOCK_BITS 8
-
-/* forward declarations */
-static OSSL_OP_cipher_encrypt_init_fn aes_xts_einit;
-static OSSL_OP_cipher_decrypt_init_fn aes_xts_dinit;
-static OSSL_OP_cipher_update_fn aes_xts_stream_update;
-static OSSL_OP_cipher_final_fn aes_xts_stream_final;
-static OSSL_OP_cipher_cipher_fn aes_xts_cipher;
-static OSSL_OP_cipher_freectx_fn aes_xts_freectx;
-static OSSL_OP_cipher_dupctx_fn aes_xts_dupctx;
-static OSSL_OP_cipher_set_ctx_params_fn aes_xts_set_ctx_params;
-static OSSL_OP_cipher_settable_ctx_params_fn aes_xts_settable_ctx_params;
-
-/*
- * Verify that the two keys are different.
- *
- * This addresses the vulnerability described in Rogaway's
- * September 2004 paper:
- *
- * "Efficient Instantiations of Tweakable Blockciphers and
- * Refinements to Modes OCB and PMAC".
- * (http://web.cs.ucdavis.edu/~rogaway/papers/offsets.pdf)
- *
- * FIPS 140-2 IG A.9 XTS-AES Key Generation Requirements states
- * that:
- * "The check for Key_1 != Key_2 shall be done at any place
- * BEFORE using the keys in the XTS-AES algorithm to process
- * data with them."
- */
-static int aes_xts_check_keys_differ(const unsigned char *key, size_t bytes,
- int enc)
-{
- if ((!allow_insecure_decrypt || enc)
- && CRYPTO_memcmp(key, key + bytes, bytes) == 0) {
- ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DUPLICATED_KEYS);
- return 0;
- }
- return 1;
-}
-
-/*-
- * Provider dispatch functions
- */
-static int aes_xts_init(void *vctx, const unsigned char *key, size_t keylen,
- const unsigned char *iv, size_t ivlen, int enc)
-{
- PROV_AES_XTS_CTX *xctx = (PROV_AES_XTS_CTX *)vctx;
- PROV_CIPHER_CTX *ctx = &xctx->base;
-
- ctx->enc = enc;
-
- if (iv != NULL) {
- if (!cipher_generic_initiv(vctx, iv, ivlen))
- return 0;
- }
- if (key != NULL) {
- if (keylen != ctx->keylen) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
- return 0;
- }
- if (!aes_xts_check_keys_differ(key, keylen / 2, enc))
- return 0;
- return ctx->hw->init(ctx, key, keylen);
- }
- return 1;
-}
-
-static int aes_xts_einit(void *vctx, const unsigned char *key, size_t keylen,
- const unsigned char *iv, size_t ivlen)
-{
- return aes_xts_init(vctx, key, keylen, iv, ivlen, 1);
-}
-
-static int aes_xts_dinit(void *vctx, const unsigned char *key, size_t keylen,
- const unsigned char *iv, size_t ivlen)
-{
- return aes_xts_init(vctx, key, keylen, iv, ivlen, 0);
-}
-
-static void *aes_xts_newctx(void *provctx, unsigned int mode, uint64_t flags,
- size_t kbits, size_t blkbits, size_t ivbits)
-{
- PROV_AES_XTS_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
-
- if (ctx != NULL) {
- cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits, mode, flags,
- PROV_CIPHER_HW_aes_xts(kbits), NULL);
- }
- return ctx;
-}
-
-static void aes_xts_freectx(void *vctx)
-{
- PROV_AES_XTS_CTX *ctx = (PROV_AES_XTS_CTX *)vctx;
-
- OPENSSL_clear_free(ctx, sizeof(*ctx));
-}
-
-static void *aes_xts_dupctx(void *vctx)
-{
- PROV_AES_XTS_CTX *in = (PROV_AES_XTS_CTX *)vctx;
- PROV_AES_XTS_CTX *ret = NULL;
-
- if (in->xts.key1 != NULL) {
- if (in->xts.key1 != &in->ks1)
- return NULL;
- }
- if (in->xts.key2 != NULL) {
- if (in->xts.key2 != &in->ks2)
- return NULL;
- }
- ret = OPENSSL_malloc(sizeof(*ret));
- if (ret == NULL) {
- ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
- *ret = *in;
- return ret;
-}
-
-static int aes_xts_cipher(void *vctx, unsigned char *out, size_t *outl,
- size_t outsize, const unsigned char *in, size_t inl)
-{
- PROV_AES_XTS_CTX *ctx = (PROV_AES_XTS_CTX *)vctx;
-
- if (ctx->xts.key1 == NULL
- || ctx->xts.key2 == NULL
- || !ctx->base.iv_set
- || out == NULL
- || in == NULL
- || inl < AES_BLOCK_SIZE)
- return 0;
-
- /*
- * Impose a limit of 2^20 blocks per data unit as specifed by
- * IEEE Std 1619-2018. The earlier and obsolete IEEE Std 1619-2007
- * indicated that this was a SHOULD NOT rather than a MUST NOT.
- * NIST SP 800-38E mandates the same limit.
- */
- if (inl > XTS_MAX_BLOCKS_PER_DATA_UNIT * AES_BLOCK_SIZE) {
- ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DATA_UNIT_IS_TOO_LARGE);
- return 0;
- }
-
- if (ctx->stream != NULL)
- (*ctx->stream)(in, out, inl, ctx->xts.key1, ctx->xts.key2, ctx->base.iv);
- else if (CRYPTO_xts128_encrypt(&ctx->xts, ctx->base.iv, in, out, inl,
- ctx->base.enc))
- return 0;
-
- *outl = inl;
- return 1;
-}
-
-static int aes_xts_stream_update(void *vctx, unsigned char *out, size_t *outl,
- size_t outsize, const unsigned char *in,
- size_t inl)
-{
- PROV_AES_XTS_CTX *ctx = (PROV_AES_XTS_CTX *)vctx;
-
- if (outsize < inl) {
- ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
- return 0;
- }
-
- if (!aes_xts_cipher(ctx, out, outl, outsize, in, inl)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
- return 0;
- }
-
- return 1;
-}
-
-static int aes_xts_stream_final(void *vctx, unsigned char *out, size_t *outl,
- size_t outsize)
-{
- *outl = 0;
- return 1;
-}
-
-static const OSSL_PARAM aes_xts_known_settable_ctx_params[] = {
- OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
- OSSL_PARAM_END
-};
-
-static const OSSL_PARAM *aes_xts_settable_ctx_params(void)
-{
- return aes_xts_known_settable_ctx_params;
-}
-
-static int aes_xts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
-{
- PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
- const OSSL_PARAM *p;
-
- /*
- * TODO(3.0) We need a general solution for handling missing parameters
- * inside set_params and get_params methods.
- */
- p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
- if (p != NULL) {
- size_t keylen;
-
- if (!OSSL_PARAM_get_size_t(p, &keylen)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
- return 0;
- }
- /* The key length can not be modified for xts mode */
- if (keylen != ctx->keylen)
- return 0;
- }
-
- return 1;
-}
-
-#define IMPLEMENT_cipher(lcmode, UCMODE, kbits, flags) \
-static OSSL_OP_cipher_get_params_fn aes_##kbits##_##lcmode##_get_params; \
-static int aes_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
-{ \
- return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
- flags, 2 * kbits, AES_XTS_BLOCK_BITS, \
- AES_XTS_IV_BITS); \
-} \
-static OSSL_OP_cipher_newctx_fn aes_##kbits##_xts_newctx; \
-static void *aes_##kbits##_xts_newctx(void *provctx) \
-{ \
- return aes_xts_newctx(provctx, EVP_CIPH_##UCMODE##_MODE, flags, 2 * kbits, \
- AES_XTS_BLOCK_BITS, AES_XTS_IV_BITS); \
-} \
-const OSSL_DISPATCH aes##kbits##xts_functions[] = { \
- { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_##kbits##_xts_newctx }, \
- { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_xts_einit }, \
- { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_xts_dinit }, \
- { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_xts_stream_update }, \
- { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_xts_stream_final }, \
- { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_xts_cipher }, \
- { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_xts_freectx }, \
- { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_xts_dupctx }, \
- { OSSL_FUNC_CIPHER_GET_PARAMS, \
- (void (*)(void))aes_##kbits##_##lcmode##_get_params }, \
- { OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
- (void (*)(void))cipher_generic_gettable_params }, \
- { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
- (void (*)(void))cipher_generic_get_ctx_params }, \
- { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
- (void (*)(void))cipher_generic_gettable_ctx_params }, \
- { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
- (void (*)(void))aes_xts_set_ctx_params }, \
- { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
- (void (*)(void))aes_xts_settable_ctx_params }, \
- { 0, NULL } \
-}
-
-IMPLEMENT_cipher(xts, XTS, 256, AES_XTS_FLAGS);
-IMPLEMENT_cipher(xts, XTS, 128, AES_XTS_FLAGS);
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