mirror of
https://github.com/openssl/openssl.git
synced 2024-12-21 06:09:35 +08:00
1017ab21e4
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/12603)
545 lines
16 KiB
C
545 lines
16 KiB
C
/*
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* Copyright 2018-2020 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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/*
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* See SP800-185 "Appendix A - KMAC, .... in Terms of Keccak[c]"
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*
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* Inputs are:
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* K = Key (len(K) < 2^2040 bits)
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* X = Input
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* L = Output length (0 <= L < 2^2040 bits)
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* S = Customization String Default="" (len(S) < 2^2040 bits)
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*
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* KMAC128(K, X, L, S)
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* {
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* newX = bytepad(encode_string(K), 168) || X || right_encode(L).
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* T = bytepad(encode_string("KMAC") || encode_string(S), 168).
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* return KECCAK[256](T || newX || 00, L).
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* }
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*
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* KMAC256(K, X, L, S)
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* {
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* newX = bytepad(encode_string(K), 136) || X || right_encode(L).
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* T = bytepad(encode_string("KMAC") || encode_string(S), 136).
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* return KECCAK[512](T || newX || 00, L).
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* }
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*
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* KMAC128XOF(K, X, L, S)
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* {
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* newX = bytepad(encode_string(K), 168) || X || right_encode(0).
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* T = bytepad(encode_string("KMAC") || encode_string(S), 168).
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* return KECCAK[256](T || newX || 00, L).
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* }
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*
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* KMAC256XOF(K, X, L, S)
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* {
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* newX = bytepad(encode_string(K), 136) || X || right_encode(0).
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* T = bytepad(encode_string("KMAC") || encode_string(S), 136).
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* return KECCAK[512](T || newX || 00, L).
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* }
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/core_dispatch.h>
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#include <openssl/core_names.h>
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#include <openssl/params.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include "prov/providercommonerr.h"
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "prov/provider_util.h"
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/*
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* Forward declaration of everything implemented here. This is not strictly
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* necessary for the compiler, but provides an assurance that the signatures
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* of the functions in the dispatch table are correct.
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*/
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static OSSL_FUNC_mac_newctx_fn kmac128_new;
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static OSSL_FUNC_mac_newctx_fn kmac256_new;
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static OSSL_FUNC_mac_dupctx_fn kmac_dup;
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static OSSL_FUNC_mac_freectx_fn kmac_free;
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static OSSL_FUNC_mac_gettable_ctx_params_fn kmac_gettable_ctx_params;
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static OSSL_FUNC_mac_get_ctx_params_fn kmac_get_ctx_params;
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static OSSL_FUNC_mac_settable_ctx_params_fn kmac_settable_ctx_params;
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static OSSL_FUNC_mac_set_ctx_params_fn kmac_set_ctx_params;
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static OSSL_FUNC_mac_size_fn kmac_size;
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static OSSL_FUNC_mac_init_fn kmac_init;
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static OSSL_FUNC_mac_update_fn kmac_update;
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static OSSL_FUNC_mac_final_fn kmac_final;
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#define KMAC_MAX_BLOCKSIZE ((1600 - 128*2) / 8) /* 168 */
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#define KMAC_MIN_BLOCKSIZE ((1600 - 256*2) / 8) /* 136 */
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/* Length encoding will be a 1 byte size + length in bits (2 bytes max) */
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#define KMAC_MAX_ENCODED_HEADER_LEN 3
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/*
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* Custom string max size is chosen such that:
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* len(encoded_string(custom) + len(kmac_encoded_string) <= KMAC_MIN_BLOCKSIZE
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* i.e: (KMAC_MAX_CUSTOM + KMAC_MAX_ENCODED_LEN) + 6 <= 136
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*/
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#define KMAC_MAX_CUSTOM 127
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/* Maximum size of encoded custom string */
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#define KMAC_MAX_CUSTOM_ENCODED (KMAC_MAX_CUSTOM + KMAC_MAX_ENCODED_HEADER_LEN)
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/* Maximum key size in bytes = 2040 / 8 */
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#define KMAC_MAX_KEY 255
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/*
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* Maximum Encoded Key size will be padded to a multiple of the blocksize
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* i.e KMAC_MAX_KEY + KMAC_MAX_ENCODED_LEN = 258
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* Padded to a multiple of KMAC_MAX_BLOCKSIZE
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*/
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#define KMAC_MAX_KEY_ENCODED (KMAC_MAX_BLOCKSIZE * 2)
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/* Fixed value of encode_string("KMAC") */
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static const unsigned char kmac_string[] = {
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0x01, 0x20, 0x4B, 0x4D, 0x41, 0x43
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};
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#define KMAC_FLAG_XOF_MODE 1
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struct kmac_data_st {
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void *provctx;
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EVP_MD_CTX *ctx;
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PROV_DIGEST digest;
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size_t out_len;
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int key_len;
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int custom_len;
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/* If xof_mode = 1 then we use right_encode(0) */
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int xof_mode;
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/* key and custom are stored in encoded form */
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unsigned char key[KMAC_MAX_KEY_ENCODED];
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unsigned char custom[KMAC_MAX_CUSTOM_ENCODED];
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};
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static int encode_string(unsigned char *out, int *out_len,
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const unsigned char *in, int in_len);
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static int right_encode(unsigned char *out, int *out_len, size_t bits);
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static int bytepad(unsigned char *out, int *out_len,
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const unsigned char *in1, int in1_len,
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const unsigned char *in2, int in2_len,
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int w);
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static int kmac_bytepad_encode_key(unsigned char *out, int *out_len,
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const unsigned char *in, int in_len,
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int w);
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static void kmac_free(void *vmacctx)
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{
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struct kmac_data_st *kctx = vmacctx;
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if (kctx != NULL) {
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EVP_MD_CTX_free(kctx->ctx);
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ossl_prov_digest_reset(&kctx->digest);
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OPENSSL_cleanse(kctx->key, kctx->key_len);
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OPENSSL_cleanse(kctx->custom, kctx->custom_len);
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OPENSSL_free(kctx);
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}
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}
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/*
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* We have KMAC implemented as a hash, which we can use instead of
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* reimplementing the EVP functionality with direct use of
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* keccak_mac_init() and friends.
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*/
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static struct kmac_data_st *kmac_new(void *provctx)
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{
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struct kmac_data_st *kctx;
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if ((kctx = OPENSSL_zalloc(sizeof(*kctx))) == NULL
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|| (kctx->ctx = EVP_MD_CTX_new()) == NULL) {
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kmac_free(kctx);
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return NULL;
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}
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kctx->provctx = provctx;
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return kctx;
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}
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static void *kmac_fetch_new(void *provctx, const OSSL_PARAM *params)
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{
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struct kmac_data_st *kctx = kmac_new(provctx);
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if (kctx == NULL)
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return 0;
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if (!ossl_prov_digest_load_from_params(&kctx->digest, params,
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PROV_LIBRARY_CONTEXT_OF(provctx))) {
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kmac_free(kctx);
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return 0;
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}
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kctx->out_len = EVP_MD_size(ossl_prov_digest_md(&kctx->digest));
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return kctx;
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}
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static void *kmac128_new(void *provctx)
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{
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static const OSSL_PARAM kmac128_params[] = {
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OSSL_PARAM_utf8_string("digest", OSSL_DIGEST_NAME_KECCAK_KMAC128,
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sizeof(OSSL_DIGEST_NAME_KECCAK_KMAC128)),
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OSSL_PARAM_END
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};
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return kmac_fetch_new(provctx, kmac128_params);
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}
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static void *kmac256_new(void *provctx)
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{
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static const OSSL_PARAM kmac256_params[] = {
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OSSL_PARAM_utf8_string("digest", OSSL_DIGEST_NAME_KECCAK_KMAC256,
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sizeof(OSSL_DIGEST_NAME_KECCAK_KMAC256)),
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OSSL_PARAM_END
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};
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return kmac_fetch_new(provctx, kmac256_params);
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}
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static void *kmac_dup(void *vsrc)
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{
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struct kmac_data_st *src = vsrc;
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struct kmac_data_st *dst = kmac_new(src->provctx);
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if (dst == NULL)
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return NULL;
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if (!EVP_MD_CTX_copy(dst->ctx, src->ctx)
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|| !ossl_prov_digest_copy(&dst->digest, &src->digest)) {
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kmac_free(dst);
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return NULL;
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}
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dst->out_len = src->out_len;
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dst->key_len = src->key_len;
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dst->custom_len = src->custom_len;
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dst->xof_mode = src->xof_mode;
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memcpy(dst->key, src->key, src->key_len);
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memcpy(dst->custom, src->custom, dst->custom_len);
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return dst;
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}
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/*
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* The init() assumes that any ctrl methods are set beforehand for
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* md, key and custom. Setting the fields afterwards will have no
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* effect on the output mac.
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*/
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static int kmac_init(void *vmacctx)
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{
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struct kmac_data_st *kctx = vmacctx;
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EVP_MD_CTX *ctx = kctx->ctx;
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unsigned char out[KMAC_MAX_BLOCKSIZE];
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int out_len, block_len;
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/* Check key has been set */
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if (kctx->key_len == 0) {
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EVPerr(EVP_F_KMAC_INIT, EVP_R_NO_KEY_SET);
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return 0;
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}
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if (!EVP_DigestInit_ex(kctx->ctx, ossl_prov_digest_md(&kctx->digest),
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NULL))
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return 0;
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block_len = EVP_MD_block_size(ossl_prov_digest_md(&kctx->digest));
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if (block_len < 0)
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return 0;
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/* Set default custom string if it is not already set */
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if (kctx->custom_len == 0) {
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const OSSL_PARAM params[] = {
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OSSL_PARAM_octet_string(OSSL_MAC_PARAM_CUSTOM, "", 0),
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OSSL_PARAM_END
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};
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(void)kmac_set_ctx_params(kctx, params);
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}
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return bytepad(out, &out_len, kmac_string, sizeof(kmac_string),
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kctx->custom, kctx->custom_len, block_len)
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&& EVP_DigestUpdate(ctx, out, out_len)
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&& EVP_DigestUpdate(ctx, kctx->key, kctx->key_len);
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}
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static size_t kmac_size(void *vmacctx)
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{
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struct kmac_data_st *kctx = vmacctx;
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return kctx->out_len;
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}
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static int kmac_update(void *vmacctx, const unsigned char *data,
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size_t datalen)
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{
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struct kmac_data_st *kctx = vmacctx;
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return EVP_DigestUpdate(kctx->ctx, data, datalen);
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}
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static int kmac_final(void *vmacctx, unsigned char *out, size_t *outl,
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size_t outsize)
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{
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struct kmac_data_st *kctx = vmacctx;
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EVP_MD_CTX *ctx = kctx->ctx;
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int lbits, len;
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unsigned char encoded_outlen[KMAC_MAX_ENCODED_HEADER_LEN];
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int ok;
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/* KMAC XOF mode sets the encoded length to 0 */
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lbits = (kctx->xof_mode ? 0 : (kctx->out_len * 8));
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ok = right_encode(encoded_outlen, &len, lbits)
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&& EVP_DigestUpdate(ctx, encoded_outlen, len)
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&& EVP_DigestFinalXOF(ctx, out, kctx->out_len);
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*outl = kctx->out_len;
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return ok;
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}
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static const OSSL_PARAM known_gettable_ctx_params[] = {
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OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *kmac_gettable_ctx_params(ossl_unused void *provctx)
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{
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return known_gettable_ctx_params;
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}
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static int kmac_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
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{
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OSSL_PARAM *p;
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if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
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return OSSL_PARAM_set_size_t(p, kmac_size(vmacctx));
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return 1;
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}
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static const OSSL_PARAM known_settable_ctx_params[] = {
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OSSL_PARAM_int(OSSL_MAC_PARAM_XOF, NULL),
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OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
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OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_MAC_PARAM_CUSTOM, NULL, 0),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *kmac_settable_ctx_params(ossl_unused void *provctx)
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{
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return known_settable_ctx_params;
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}
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/*
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* The following params can be set any time before final():
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* - "outlen" or "size": The requested output length.
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* - "xof": If set, this indicates that right_encoded(0)
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* is part of the digested data, otherwise it
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* uses right_encoded(requested output length).
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*
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* All other params should be set before init().
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*/
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static int kmac_set_ctx_params(void *vmacctx, const OSSL_PARAM *params)
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{
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struct kmac_data_st *kctx = vmacctx;
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const OSSL_PARAM *p;
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const EVP_MD *digest = ossl_prov_digest_md(&kctx->digest);
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if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_XOF)) != NULL
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&& !OSSL_PARAM_get_int(p, &kctx->xof_mode))
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return 0;
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if (((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SIZE)) != NULL)
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&& !OSSL_PARAM_get_size_t(p, &kctx->out_len))
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return 0;
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if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
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if (p->data_size < 4 || p->data_size > KMAC_MAX_KEY) {
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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 (!kmac_bytepad_encode_key(kctx->key, &kctx->key_len,
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p->data, p->data_size,
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EVP_MD_block_size(digest)))
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return 0;
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}
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if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_CUSTOM))
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!= NULL) {
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if (p->data_size > KMAC_MAX_CUSTOM) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CUSTOM_LENGTH);
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return 0;
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}
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if (!encode_string(kctx->custom, &kctx->custom_len,
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p->data, p->data_size))
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return 0;
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}
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return 1;
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}
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/*
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* Encoding/Padding Methods.
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*/
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/* Returns the number of bytes required to store 'bits' into a byte array */
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static unsigned int get_encode_size(size_t bits)
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{
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unsigned int cnt = 0, sz = sizeof(size_t);
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while (bits && (cnt < sz)) {
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++cnt;
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bits >>= 8;
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}
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/* If bits is zero 1 byte is required */
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if (cnt == 0)
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cnt = 1;
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return cnt;
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}
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/*
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* Convert an integer into bytes . The number of bytes is appended
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* to the end of the buffer. Returns an array of bytes 'out' of size
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* *out_len.
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*
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* e.g if bits = 32, out[2] = { 0x20, 0x01 }
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*
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*/
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static int right_encode(unsigned char *out, int *out_len, size_t bits)
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{
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unsigned int len = get_encode_size(bits);
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int i;
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/* The length is constrained to a single byte: 2040/8 = 255 */
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if (len > 0xFF)
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return 0;
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/* MSB's are at the start of the bytes array */
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for (i = len - 1; i >= 0; --i) {
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out[i] = (unsigned char)(bits & 0xFF);
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bits >>= 8;
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}
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/* Tack the length onto the end */
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out[len] = (unsigned char)len;
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/* The Returned length includes the tacked on byte */
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*out_len = len + 1;
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return 1;
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}
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/*
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* Encodes a string with a left encoded length added. Note that the
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* in_len is converted to bits (*8).
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*
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* e.g- in="KMAC" gives out[6] = { 0x01, 0x20, 0x4B, 0x4D, 0x41, 0x43 }
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* len bits K M A C
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*/
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static int encode_string(unsigned char *out, int *out_len,
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const unsigned char *in, int in_len)
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{
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if (in == NULL) {
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*out_len = 0;
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} else {
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int i, bits, len;
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bits = 8 * in_len;
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len = get_encode_size(bits);
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if (len > 0xFF)
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return 0;
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out[0] = len;
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for (i = len; i > 0; --i) {
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out[i] = (bits & 0xFF);
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bits >>= 8;
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}
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memcpy(out + len + 1, in, in_len);
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*out_len = (1 + len + in_len);
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}
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return 1;
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}
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/*
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* Returns a zero padded encoding of the inputs in1 and an optional
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* in2 (can be NULL). The padded output must be a multiple of the blocksize 'w'.
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* The value of w is in bytes (< 256).
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*
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* The returned output is:
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* zero_padded(multiple of w, (left_encode(w) || in1 [|| in2])
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*/
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static int bytepad(unsigned char *out, int *out_len,
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const unsigned char *in1, int in1_len,
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const unsigned char *in2, int in2_len, int w)
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{
|
|
int len;
|
|
unsigned char *p = out;
|
|
int sz = w;
|
|
|
|
/* Left encoded w */
|
|
*p++ = 1;
|
|
*p++ = w;
|
|
/* || in1 */
|
|
memcpy(p, in1, in1_len);
|
|
p += in1_len;
|
|
/* [ || in2 ] */
|
|
if (in2 != NULL && in2_len > 0) {
|
|
memcpy(p, in2, in2_len);
|
|
p += in2_len;
|
|
}
|
|
/* Figure out the pad size (divisible by w) */
|
|
len = p - out;
|
|
while (len > sz) {
|
|
sz += w;
|
|
}
|
|
/* zero pad the end of the buffer */
|
|
memset(p, 0, sz - len);
|
|
*out_len = sz;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Returns out = bytepad(encode_string(in), w)
|
|
*/
|
|
static int kmac_bytepad_encode_key(unsigned char *out, int *out_len,
|
|
const unsigned char *in, int in_len,
|
|
int w)
|
|
{
|
|
unsigned char tmp[KMAC_MAX_KEY + KMAC_MAX_ENCODED_HEADER_LEN];
|
|
int tmp_len;
|
|
|
|
if (!encode_string(tmp, &tmp_len, in, in_len))
|
|
return 0;
|
|
|
|
return bytepad(out, out_len, tmp, tmp_len, NULL, 0, w);
|
|
}
|
|
|
|
const OSSL_DISPATCH kmac128_functions[] = {
|
|
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))kmac128_new },
|
|
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))kmac_dup },
|
|
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))kmac_free },
|
|
{ OSSL_FUNC_MAC_INIT, (void (*)(void))kmac_init },
|
|
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))kmac_update },
|
|
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))kmac_final },
|
|
{ OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
|
|
(void (*)(void))kmac_gettable_ctx_params },
|
|
{ OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))kmac_get_ctx_params },
|
|
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
|
|
(void (*)(void))kmac_settable_ctx_params },
|
|
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))kmac_set_ctx_params },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
const OSSL_DISPATCH kmac256_functions[] = {
|
|
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))kmac256_new },
|
|
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))kmac_dup },
|
|
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))kmac_free },
|
|
{ OSSL_FUNC_MAC_INIT, (void (*)(void))kmac_init },
|
|
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))kmac_update },
|
|
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))kmac_final },
|
|
{ OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
|
|
(void (*)(void))kmac_gettable_ctx_params },
|
|
{ OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))kmac_get_ctx_params },
|
|
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
|
|
(void (*)(void))kmac_settable_ctx_params },
|
|
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))kmac_set_ctx_params },
|
|
{ 0, NULL }
|
|
};
|