/*
 * Copyright 2019-2024 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
 */

/*
 * This file uses the low level AES functions (which are deprecated for
 * non-internal use) in order to implement provider AES ciphers.
 */
#include "internal/deprecated.h"

#include "cipher_aes_ocb.h"

#define OCB_SET_KEY_FN(fn_set_enc_key, fn_set_dec_key,                          \
    fn_block_enc, fn_block_dec,                                                 \
    fn_stream_enc, fn_stream_dec)                                               \
    CRYPTO_ocb128_cleanup(&ctx->ocb);                                           \
    fn_set_enc_key(key, keylen * 8, &ctx->ksenc.ks);                            \
    fn_set_dec_key(key, keylen * 8, &ctx->ksdec.ks);                            \
    if (!CRYPTO_ocb128_init(&ctx->ocb, &ctx->ksenc.ks, &ctx->ksdec.ks,          \
            (block128_f)fn_block_enc, (block128_f)fn_block_dec,                 \
            ctx->base.enc ? (ocb128_f)fn_stream_enc : (ocb128_f)fn_stream_dec)) \
        return 0;                                                               \
    ctx->key_set = 1

static int cipher_hw_aes_ocb_generic_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

/*
 * We set both the encrypt and decrypt key here because decrypt
 * needs both. (i.e- AAD uses encrypt).
 */
#ifdef HWAES_CAPABLE
    if (HWAES_CAPABLE) {
        OCB_SET_KEY_FN(HWAES_set_encrypt_key, HWAES_set_decrypt_key,
            HWAES_encrypt, HWAES_decrypt,
            HWAES_ocb_encrypt, HWAES_ocb_decrypt);
    } else
#endif
#ifdef VPAES_CAPABLE
        if (VPAES_CAPABLE) {
        OCB_SET_KEY_FN(vpaes_set_encrypt_key, vpaes_set_decrypt_key,
            vpaes_encrypt, vpaes_decrypt, NULL, NULL);
    } else
#endif
    {
        OCB_SET_KEY_FN(AES_set_encrypt_key, AES_set_decrypt_key,
            AES_encrypt, AES_decrypt, NULL, NULL);
    }
    return 1;
}

#if defined(AESNI_CAPABLE)

static int cipher_hw_aes_ocb_aesni_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

    OCB_SET_KEY_FN(aesni_set_encrypt_key, aesni_set_decrypt_key,
        aesni_encrypt, aesni_decrypt,
        aesni_ocb_encrypt, aesni_ocb_decrypt);
    return 1;
}

#define PROV_CIPHER_HW_declare()              \
    static const PROV_CIPHER_HW aesni_ocb = { \
        cipher_hw_aes_ocb_aesni_initkey,      \
        NULL                                  \
    };
#define PROV_CIPHER_HW_select() \
    if (AESNI_CAPABLE)          \
        return &aesni_ocb;

#elif defined(SPARC_AES_CAPABLE)

static int cipher_hw_aes_ocb_t4_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

    OCB_SET_KEY_FN(aes_t4_set_encrypt_key, aes_t4_set_decrypt_key,
        aes_t4_encrypt, aes_t4_decrypt, NULL, NULL);
    return 1;
}

#define PROV_CIPHER_HW_declare()               \
    static const PROV_CIPHER_HW aes_t4_ocb = { \
        cipher_hw_aes_ocb_t4_initkey,          \
        NULL                                   \
    };
#define PROV_CIPHER_HW_select() \
    if (SPARC_AES_CAPABLE)      \
        return &aes_t4_ocb;

#elif defined(OPENSSL_CPUID_OBJ) && defined(__riscv) && __riscv_xlen == 64

static int cipher_hw_aes_ocb_rv64i_zknd_zkne_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

    OCB_SET_KEY_FN(rv64i_zkne_set_encrypt_key, rv64i_zknd_set_decrypt_key,
        rv64i_zkne_encrypt, rv64i_zknd_decrypt, NULL, NULL);
    return 1;
}

static int cipher_hw_aes_ocb_rv64i_zvkned_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

    /* Zvkned only supports 128 and 256 bit keys. */
    if (keylen * 8 == 128 || keylen * 8 == 256) {
        OCB_SET_KEY_FN(rv64i_zvkned_set_encrypt_key,
            rv64i_zvkned_set_decrypt_key,
            rv64i_zvkned_encrypt, rv64i_zvkned_decrypt,
            NULL, NULL);
    } else {
        OCB_SET_KEY_FN(AES_set_encrypt_key, AES_set_encrypt_key,
            rv64i_zvkned_encrypt, rv64i_zvkned_decrypt,
            NULL, NULL);
    }
    return 1;
}

#define PROV_CIPHER_HW_declare()                            \
    static const PROV_CIPHER_HW aes_rv64i_zknd_zkne_ocb = { \
        cipher_hw_aes_ocb_rv64i_zknd_zkne_initkey,          \
        NULL                                                \
    };                                                      \
    static const PROV_CIPHER_HW aes_rv64i_zvkned_ocb = {    \
        cipher_hw_aes_ocb_rv64i_zvkned_initkey,             \
        NULL                                                \
    };
#define PROV_CIPHER_HW_select()                    \
    if (RISCV_HAS_ZVKNED() && riscv_vlen() >= 128) \
        return &aes_rv64i_zvkned_ocb;              \
    else if (RISCV_HAS_ZKND_AND_ZKNE())            \
        return &aes_rv64i_zknd_zkne_ocb;

#elif defined(OPENSSL_CPUID_OBJ) && defined(__riscv) && __riscv_xlen == 32

static int cipher_hw_aes_ocb_rv32i_zknd_zkne_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

    OCB_SET_KEY_FN(rv32i_zkne_set_encrypt_key, rv32i_zknd_zkne_set_decrypt_key,
        rv32i_zkne_encrypt, rv32i_zknd_decrypt, NULL, NULL);
    return 1;
}

static int cipher_hw_aes_ocb_rv32i_zbkb_zknd_zkne_initkey(PROV_CIPHER_CTX *vctx,
    const unsigned char *key,
    size_t keylen)
{
    PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;

    OCB_SET_KEY_FN(rv32i_zbkb_zkne_set_encrypt_key, rv32i_zbkb_zknd_zkne_set_decrypt_key,
        rv32i_zkne_encrypt, rv32i_zknd_decrypt, NULL, NULL);
    return 1;
}

#define PROV_CIPHER_HW_declare()                                 \
    static const PROV_CIPHER_HW aes_rv32i_zknd_zkne_ocb = {      \
        cipher_hw_aes_ocb_rv32i_zknd_zkne_initkey,               \
        NULL                                                     \
    };                                                           \
    static const PROV_CIPHER_HW aes_rv32i_zbkb_zknd_zkne_ocb = { \
        cipher_hw_aes_ocb_rv32i_zbkb_zknd_zkne_initkey,          \
        NULL                                                     \
    };
#define PROV_CIPHER_HW_select()               \
    if (RISCV_HAS_ZBKB_AND_ZKND_AND_ZKNE())   \
        return &aes_rv32i_zbkb_zknd_zkne_ocb; \
    if (RISCV_HAS_ZKND_AND_ZKNE())            \
        return &aes_rv32i_zknd_zkne_ocb;
#else
#define PROV_CIPHER_HW_declare()
#define PROV_CIPHER_HW_select()
#endif

static const PROV_CIPHER_HW aes_generic_ocb = {
    cipher_hw_aes_ocb_generic_initkey,
    NULL
};
PROV_CIPHER_HW_declare()
    const PROV_CIPHER_HW *ossl_prov_cipher_hw_aes_ocb(size_t keybits)
{
    PROV_CIPHER_HW_select() return &aes_generic_ocb;
}