282 lines
10 KiB
C
282 lines
10 KiB
C
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/*
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* Dispatch functions for SM4 XTS mode */
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#include <openssl/proverr.h>
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#include "cipher_sm4_xts.h"
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#include "prov/implementations.h"
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#include "prov/providercommon.h"
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#define SM4_XTS_FLAGS PROV_CIPHER_FLAG_CUSTOM_IV
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#define SM4_XTS_IV_BITS 128
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#define SM4_XTS_BLOCK_BITS 8
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/* forward declarations */
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static OSSL_FUNC_cipher_encrypt_init_fn sm4_xts_einit;
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static OSSL_FUNC_cipher_decrypt_init_fn sm4_xts_dinit;
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static OSSL_FUNC_cipher_update_fn sm4_xts_stream_update;
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static OSSL_FUNC_cipher_final_fn sm4_xts_stream_final;
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static OSSL_FUNC_cipher_cipher_fn sm4_xts_cipher;
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static OSSL_FUNC_cipher_freectx_fn sm4_xts_freectx;
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static OSSL_FUNC_cipher_dupctx_fn sm4_xts_dupctx;
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static OSSL_FUNC_cipher_set_ctx_params_fn sm4_xts_set_ctx_params;
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static OSSL_FUNC_cipher_settable_ctx_params_fn sm4_xts_settable_ctx_params;
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/*-
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* Provider dispatch functions
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*/
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static int sm4_xts_init(void *vctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen,
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const OSSL_PARAM params[], int enc)
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{
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PROV_SM4_XTS_CTX *xctx = (PROV_SM4_XTS_CTX *)vctx;
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PROV_CIPHER_CTX *ctx = &xctx->base;
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if (!ossl_prov_is_running())
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return 0;
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ctx->enc = enc;
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if (iv != NULL) {
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if (!ossl_cipher_generic_initiv(vctx, iv, ivlen))
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return 0;
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}
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if (key != NULL) {
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if (keylen != ctx->keylen) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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if (!ctx->hw->init(ctx, key, keylen))
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return 0;
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}
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return sm4_xts_set_ctx_params(xctx, params);
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}
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static int sm4_xts_einit(void *vctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen,
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const OSSL_PARAM params[])
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{
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return sm4_xts_init(vctx, key, keylen, iv, ivlen, params, 1);
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}
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static int sm4_xts_dinit(void *vctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen,
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const OSSL_PARAM params[])
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{
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return sm4_xts_init(vctx, key, keylen, iv, ivlen, params, 0);
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}
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static void *sm4_xts_newctx(void *provctx, unsigned int mode, uint64_t flags,
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size_t kbits, size_t blkbits, size_t ivbits)
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{
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PROV_SM4_XTS_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx != NULL) {
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ossl_cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits, mode,
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flags, ossl_prov_cipher_hw_sm4_xts(kbits),
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NULL);
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}
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return ctx;
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}
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static void sm4_xts_freectx(void *vctx)
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{
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PROV_SM4_XTS_CTX *ctx = (PROV_SM4_XTS_CTX *)vctx;
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ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
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OPENSSL_clear_free(ctx, sizeof(*ctx));
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}
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static void *sm4_xts_dupctx(void *vctx)
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{
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PROV_SM4_XTS_CTX *in = (PROV_SM4_XTS_CTX *)vctx;
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PROV_SM4_XTS_CTX *ret = NULL;
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if (!ossl_prov_is_running())
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return NULL;
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if (in->xts.key1 != NULL) {
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if (in->xts.key1 != &in->ks1)
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return NULL;
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}
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if (in->xts.key2 != NULL) {
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if (in->xts.key2 != &in->ks2)
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return NULL;
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}
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ret = OPENSSL_malloc(sizeof(*ret));
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if (ret == NULL)
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return NULL;
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in->base.hw->copyctx(&ret->base, &in->base);
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return ret;
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}
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static int sm4_xts_cipher(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize, const unsigned char *in, size_t inl)
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{
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PROV_SM4_XTS_CTX *ctx = (PROV_SM4_XTS_CTX *)vctx;
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if (!ossl_prov_is_running()
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|| ctx->xts.key1 == NULL
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|| ctx->xts.key2 == NULL
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|| !ctx->base.iv_set
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|| out == NULL
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|| in == NULL
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|| inl < SM4_BLOCK_SIZE)
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return 0;
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/*
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* Impose a limit of 2^20 blocks per data unit as specified by
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* IEEE Std 1619-2018. The earlier and obsolete IEEE Std 1619-2007
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* indicated that this was a SHOULD NOT rather than a MUST NOT.
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* NIST SP 800-38E mandates the same limit.
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*/
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if (inl > XTS_MAX_BLOCKS_PER_DATA_UNIT * SM4_BLOCK_SIZE) {
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ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DATA_UNIT_IS_TOO_LARGE);
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return 0;
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}
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if (ctx->xts_standard) {
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if (ctx->stream != NULL)
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(*ctx->stream)(in, out, inl, ctx->xts.key1, ctx->xts.key2,
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ctx->base.iv, ctx->base.enc);
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else if (CRYPTO_xts128_encrypt(&ctx->xts, ctx->base.iv, in, out, inl,
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ctx->base.enc))
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return 0;
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} else {
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if (ctx->stream_gb != NULL)
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(*ctx->stream_gb)(in, out, inl, ctx->xts.key1, ctx->xts.key2,
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ctx->base.iv, ctx->base.enc);
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else if (ossl_crypto_xts128gb_encrypt(&ctx->xts, ctx->base.iv, in, out,
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inl, ctx->base.enc))
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return 0;
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}
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*outl = inl;
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return 1;
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}
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static int sm4_xts_stream_update(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize, const unsigned char *in,
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size_t inl)
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{
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PROV_SM4_XTS_CTX *ctx = (PROV_SM4_XTS_CTX *)vctx;
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if (outsize < inl) {
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ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
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return 0;
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}
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if (!sm4_xts_cipher(ctx, out, outl, outsize, in, inl)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
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return 0;
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}
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return 1;
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}
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static int sm4_xts_stream_final(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize)
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{
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if (!ossl_prov_is_running())
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return 0;
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*outl = 0;
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return 1;
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}
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static const OSSL_PARAM sm4_xts_known_settable_ctx_params[] = {
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OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_XTS_STANDARD, NULL, 0),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *sm4_xts_settable_ctx_params(ossl_unused void *cctx,
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ossl_unused void *provctx)
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{
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return sm4_xts_known_settable_ctx_params;
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}
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static int sm4_xts_set_ctx_params(void *vxctx, const OSSL_PARAM params[])
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{
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PROV_SM4_XTS_CTX *xctx = (PROV_SM4_XTS_CTX *)vxctx;
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const OSSL_PARAM *p;
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if (params == NULL)
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return 1;
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/*-
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* Sets the XTS standard to use with SM4-XTS algorithm.
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*
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* Must be utf8 string "GB" or "IEEE",
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* "GB" means the GB/T 17964-2021 standard
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* "IEEE" means the IEEE Std 1619-2007 standard
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*/
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_XTS_STANDARD);
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if (p != NULL) {
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const char *xts_standard = NULL;
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if (p->data_type != OSSL_PARAM_UTF8_STRING)
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return 0;
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if (!OSSL_PARAM_get_utf8_string_ptr(p, &xts_standard)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (OPENSSL_strcasecmp(xts_standard, "GB") == 0) {
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xctx->xts_standard = 0;
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} else if (OPENSSL_strcasecmp(xts_standard, "IEEE") == 0) {
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xctx->xts_standard = 1;
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} else {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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}
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return 1;
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}
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#define IMPLEMENT_cipher(lcmode, UCMODE, kbits, flags) \
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static OSSL_FUNC_cipher_get_params_fn sm4_##kbits##_##lcmode##_get_params; \
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static int sm4_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
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{ \
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return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
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flags, 2 * kbits, SM4_XTS_BLOCK_BITS,\
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SM4_XTS_IV_BITS); \
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} \
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static OSSL_FUNC_cipher_newctx_fn sm4_##kbits##_xts_newctx; \
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static void *sm4_##kbits##_xts_newctx(void *provctx) \
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{ \
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return sm4_xts_newctx(provctx, EVP_CIPH_##UCMODE##_MODE, flags, 2 * kbits, \
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SM4_XTS_BLOCK_BITS, SM4_XTS_IV_BITS); \
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} \
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const OSSL_DISPATCH ossl_sm4##kbits##xts_functions[] = { \
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{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))sm4_##kbits##_xts_newctx }, \
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{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))sm4_xts_einit }, \
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{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))sm4_xts_dinit }, \
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{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))sm4_xts_stream_update }, \
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{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))sm4_xts_stream_final }, \
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{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))sm4_xts_cipher }, \
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{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))sm4_xts_freectx }, \
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{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))sm4_xts_dupctx }, \
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{ OSSL_FUNC_CIPHER_GET_PARAMS, \
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(void (*)(void))sm4_##kbits##_##lcmode##_get_params }, \
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{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
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(void (*)(void))ossl_cipher_generic_gettable_params }, \
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{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
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(void (*)(void))ossl_cipher_generic_get_ctx_params }, \
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{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
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(void (*)(void))ossl_cipher_generic_gettable_ctx_params }, \
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{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
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(void (*)(void))sm4_xts_set_ctx_params }, \
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{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
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(void (*)(void))sm4_xts_settable_ctx_params }, \
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OSSL_DISPATCH_END \
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}
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/* ossl_sm4128xts_functions */
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IMPLEMENT_cipher(xts, XTS, 128, SM4_XTS_FLAGS);
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