// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AMCC SoC PPC4xx Crypto Driver
 *
 * Copyright (c) 2008 Applied Micro Circuits Corporation.
 * All rights reserved. James Hsiao <jhsiao@amcc.com>
 *
 * This file implements the Linux crypto algorithms.
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/spinlock_types.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <crypto/algapi.h>
#include <crypto/aead.h>
#include <crypto/aes.h>
#include <crypto/gcm.h>
#include <crypto/sha1.h>
#include <crypto/ctr.h>
#include <crypto/skcipher.h>
#include "crypto4xx_reg_def.h"
#include "crypto4xx_core.h"
#include "crypto4xx_sa.h"

static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
                                     u32 save_iv, u32 ld_h, u32 ld_iv,
                                     u32 hdr_proc, u32 h, u32 c, u32 pad_type,
                                     u32 op_grp, u32 op, u32 dir)
{
        sa->sa_command_0.w = 0;
        sa->sa_command_0.bf.save_hash_state = save_h;
        sa->sa_command_0.bf.save_iv = save_iv;
        sa->sa_command_0.bf.load_hash_state = ld_h;
        sa->sa_command_0.bf.load_iv = ld_iv;
        sa->sa_command_0.bf.hdr_proc = hdr_proc;
        sa->sa_command_0.bf.hash_alg = h;
        sa->sa_command_0.bf.cipher_alg = c;
        sa->sa_command_0.bf.pad_type = pad_type & 3;
        sa->sa_command_0.bf.extend_pad = pad_type >> 2;
        sa->sa_command_0.bf.op_group = op_grp;
        sa->sa_command_0.bf.opcode = op;
        sa->sa_command_0.bf.dir = dir;
}

static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
                                     u32 hmac_mc, u32 cfb, u32 esn,
                                     u32 sn_mask, u32 mute, u32 cp_pad,
                                     u32 cp_pay, u32 cp_hdr)
{
        sa->sa_command_1.w = 0;
        sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
        sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
        sa->sa_command_1.bf.feedback_mode = cfb;
        sa->sa_command_1.bf.sa_rev = 1;
        sa->sa_command_1.bf.hmac_muting = hmac_mc;
        sa->sa_command_1.bf.extended_seq_num = esn;
        sa->sa_command_1.bf.seq_num_mask = sn_mask;
        sa->sa_command_1.bf.mutable_bit_proc = mute;
        sa->sa_command_1.bf.copy_pad = cp_pad;
        sa->sa_command_1.bf.copy_payload = cp_pay;
        sa->sa_command_1.bf.copy_hdr = cp_hdr;
}

static inline int crypto4xx_crypt(struct skcipher_request *req,
                                  const unsigned int ivlen, bool decrypt,
                                  bool check_blocksize)
{
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        __le32 iv[AES_IV_SIZE / 4];

        if (check_blocksize && !IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE))
                return -EINVAL;

        if (ivlen)
                crypto4xx_memcpy_to_le32(iv, req->iv, ivlen);

        return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
                req->cryptlen, iv, ivlen, decrypt ? ctx->sa_in : ctx->sa_out,
                ctx->sa_len, 0, NULL);
}

int crypto4xx_encrypt_noiv_block(struct skcipher_request *req)
{
        return crypto4xx_crypt(req, 0, false, true);
}

int crypto4xx_encrypt_iv_stream(struct skcipher_request *req)
{
        return crypto4xx_crypt(req, AES_IV_SIZE, false, false);
}

int crypto4xx_decrypt_noiv_block(struct skcipher_request *req)
{
        return crypto4xx_crypt(req, 0, true, true);
}

int crypto4xx_decrypt_iv_stream(struct skcipher_request *req)
{
        return crypto4xx_crypt(req, AES_IV_SIZE, true, false);
}

int crypto4xx_encrypt_iv_block(struct skcipher_request *req)
{
        return crypto4xx_crypt(req, AES_IV_SIZE, false, true);
}

int crypto4xx_decrypt_iv_block(struct skcipher_request *req)
{
        return crypto4xx_crypt(req, AES_IV_SIZE, true, true);
}

/*
 * AES Functions
 */
static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher,
                                const u8 *key,
                                unsigned int keylen,
                                unsigned char cm,
                                u8 fb)
{
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        struct dynamic_sa_ctl *sa;
        int    rc;

        if (keylen != AES_KEYSIZE_256 && keylen != AES_KEYSIZE_192 &&
            keylen != AES_KEYSIZE_128)
                return -EINVAL;

        /* Create SA */
        if (ctx->sa_in || ctx->sa_out)
                crypto4xx_free_sa(ctx);

        rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
        if (rc)
                return rc;

        /* Setup SA */
        sa = ctx->sa_in;

        set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_ECB ?
                                 SA_NOT_SAVE_IV : SA_SAVE_IV),
                                 SA_NOT_LOAD_HASH, (cm == CRYPTO_MODE_ECB ?
                                 SA_LOAD_IV_FROM_SA : SA_LOAD_IV_FROM_STATE),
                                 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
                                 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
                                 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
                                 DIR_INBOUND);

        set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
                                 fb, SA_EXTENDED_SN_OFF,
                                 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
                                 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
                                 SA_NOT_COPY_HDR);
        crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
                                 key, keylen);
        sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2);
        sa->sa_command_1.bf.key_len = keylen >> 3;

        memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
        sa = ctx->sa_out;
        sa->sa_command_0.bf.dir = DIR_OUTBOUND;
        /*
         * SA_OPCODE_ENCRYPT is the same value as SA_OPCODE_DECRYPT.
         * it's the DIR_(IN|OUT)BOUND that matters
         */
        sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT;

        return 0;
}

int crypto4xx_setkey_aes_cbc(struct crypto_skcipher *cipher,
                             const u8 *key, unsigned int keylen)
{
        return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
                                    CRYPTO_FEEDBACK_MODE_NO_FB);
}

int crypto4xx_setkey_aes_ecb(struct crypto_skcipher *cipher,
                             const u8 *key, unsigned int keylen)
{
        return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB,
                                    CRYPTO_FEEDBACK_MODE_NO_FB);
}

int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher,
                             const u8 *key, unsigned int keylen)
{
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        int rc;

        rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE,
                CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
        if (rc)
                return rc;

        ctx->iv_nonce = cpu_to_le32p((u32 *)&key[keylen -
                                                 CTR_RFC3686_NONCE_SIZE]);

        return 0;
}

int crypto4xx_rfc3686_encrypt(struct skcipher_request *req)
{
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        __le32 iv[AES_IV_SIZE / 4] = {
                ctx->iv_nonce,
                cpu_to_le32p((u32 *) req->iv),
                cpu_to_le32p((u32 *) (req->iv + 4)),
                cpu_to_le32(1) };

        return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
                                  req->cryptlen, iv, AES_IV_SIZE,
                                  ctx->sa_out, ctx->sa_len, 0, NULL);
}

int crypto4xx_rfc3686_decrypt(struct skcipher_request *req)
{
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        __le32 iv[AES_IV_SIZE / 4] = {
                ctx->iv_nonce,
                cpu_to_le32p((u32 *) req->iv),
                cpu_to_le32p((u32 *) (req->iv + 4)),
                cpu_to_le32(1) };

        return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
                                  req->cryptlen, iv, AES_IV_SIZE,
                                  ctx->sa_out, ctx->sa_len, 0, NULL);
}

static int
crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
{
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        size_t iv_len = crypto_skcipher_ivsize(cipher);
        unsigned int counter = be32_to_cpup((__be32 *)(req->iv + iv_len - 4));
        unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
                        AES_BLOCK_SIZE;

        /*
         * The hardware uses only the last 32-bits as the counter while the
         * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
         * the whole IV is a counter.  So fallback if the counter is going to
         * overlow.
         */
        if (counter + nblks < counter) {
                SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher.cipher);
                int ret;

                skcipher_request_set_sync_tfm(subreq, ctx->sw_cipher.cipher);
                skcipher_request_set_callback(subreq, req->base.flags,
                        NULL, NULL);
                skcipher_request_set_crypt(subreq, req->src, req->dst,
                        req->cryptlen, req->iv);
                ret = encrypt ? crypto_skcipher_encrypt(subreq)
                        : crypto_skcipher_decrypt(subreq);
                skcipher_request_zero(subreq);
                return ret;
        }

        return encrypt ? crypto4xx_encrypt_iv_stream(req)
                       : crypto4xx_decrypt_iv_stream(req);
}

static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
                                       struct crypto_skcipher *cipher,
                                       const u8 *key,
                                       unsigned int keylen)
{
        crypto_sync_skcipher_clear_flags(ctx->sw_cipher.cipher,
                                    CRYPTO_TFM_REQ_MASK);
        crypto_sync_skcipher_set_flags(ctx->sw_cipher.cipher,
                crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
        return crypto_sync_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
}

int crypto4xx_setkey_aes_ctr(struct crypto_skcipher *cipher,
                             const u8 *key, unsigned int keylen)
{
        struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
        int rc;

        rc = crypto4xx_sk_setup_fallback(ctx, cipher, key, keylen);
        if (rc)
                return rc;

        return crypto4xx_setkey_aes(cipher, key, keylen,
                CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
}

int crypto4xx_encrypt_ctr(struct skcipher_request *req)
{
        return crypto4xx_ctr_crypt(req, true);
}

int crypto4xx_decrypt_ctr(struct skcipher_request *req)
{
        return crypto4xx_ctr_crypt(req, false);
}

static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
                                                unsigned int len,
                                                bool is_ccm, bool decrypt)
{
        struct crypto_aead *aead = crypto_aead_reqtfm(req);

        /* authsize has to be a multiple of 4 */
        if (aead->authsize & 3)
                return true;

        /*
         * hardware does not handle cases where plaintext
         * is less than a block.
         */
        if (len < AES_BLOCK_SIZE)
                return true;

        /* assoc len needs to be a multiple of 4 and <= 1020 */
        if (req->assoclen & 0x3 || req->assoclen > 1020)
                return true;

        /* CCM supports only counter field length of 2 and 4 bytes */
        if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
                return true;

        return false;
}

static int crypto4xx_aead_fallback(struct aead_request *req,
        struct crypto4xx_ctx *ctx, bool do_decrypt)
{
        struct aead_request *subreq = aead_request_ctx(req);

        aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
        aead_request_set_callback(subreq, req->base.flags,
                                  req->base.complete, req->base.data);
        aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
                               req->iv);
        aead_request_set_ad(subreq, req->assoclen);
        return do_decrypt ? crypto_aead_decrypt(subreq) :
                            crypto_aead_encrypt(subreq);
}

static int crypto4xx_aead_setup_fallback(struct crypto4xx_ctx *ctx,
                                         struct crypto_aead *cipher,
                                         const u8 *key,
                                         unsigned int keylen)
{
        crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
        crypto_aead_set_flags(ctx->sw_cipher.aead,
                crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
        return crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
}

/*
 * AES-CCM Functions
 */

int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
                             unsigned int keylen)
{
        struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
        struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
        struct dynamic_sa_ctl *sa;
        int rc = 0;

        rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
        if (rc)
                return rc;

        if (ctx->sa_in || ctx->sa_out)
                crypto4xx_free_sa(ctx);

        rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
        if (rc)
                return rc;

        /* Setup SA */
        sa = (struct dynamic_sa_ctl *) ctx->sa_in;
        sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);

        set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
                                 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
                                 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
                                 SA_CIPHER_ALG_AES,
                                 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
                                 SA_OPCODE_HASH_DECRYPT, DIR_INBOUND);

        set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
                                 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
                                 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
                                 SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
                                 SA_NOT_COPY_HDR);

        sa->sa_command_1.bf.key_len = keylen >> 3;

        crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);

        memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
        sa = (struct dynamic_sa_ctl *) ctx->sa_out;

        set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
                                 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
                                 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
                                 SA_CIPHER_ALG_AES,
                                 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
                                 SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);

        set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
                                 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
                                 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
                                 SA_COPY_PAD, SA_COPY_PAYLOAD,
                                 SA_NOT_COPY_HDR);

        sa->sa_command_1.bf.key_len = keylen >> 3;
        return 0;
}

static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
{
        struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
        struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
        struct crypto_aead *aead = crypto_aead_reqtfm(req);
        __le32 iv[4];
        u32 tmp_sa[SA_AES128_CCM_LEN + 4];
        struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
        unsigned int len = req->cryptlen;

        if (decrypt)
                len -= crypto_aead_authsize(aead);

        if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
                return crypto4xx_aead_fallback(req, ctx, decrypt);

        memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
        sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;

        if (req->iv[0] == 1) {
                /* CRYPTO_MODE_AES_ICM */
                sa->sa_command_1.bf.crypto_mode9_8 = 1;
        }

        iv[3] = cpu_to_le32(0);
        crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));

        return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
                                  len, iv, sizeof(iv),
                                  sa, ctx->sa_len, req->assoclen, rctx->dst);
}

int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
{
        return crypto4xx_crypt_aes_ccm(req, false);
}

int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
{
        return crypto4xx_crypt_aes_ccm(req, true);
}

int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
                               unsigned int authsize)
{
        struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
        struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);

        return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
}

/*
 * AES-GCM Functions
 */

static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
{
        switch (keylen) {
        case 16:
        case 24:
        case 32:
                return 0;
        default:
                return -EINVAL;
        }
}

static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
                                             unsigned int keylen)
{
        struct aes_enckey aes;
        uint8_t src[16] = { 0 };
        int rc;

        rc = aes_prepareenckey(&aes, key, keylen);
        if (rc) {
                pr_err("aes_prepareenckey() failed: %d\n", rc);
                return rc;
        }

        aes_encrypt(&aes, src, src);
        crypto4xx_memcpy_to_le32(hash_start, src, 16);
        memzero_explicit(&aes, sizeof(aes));
        return 0;
}

int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
                             const u8 *key, unsigned int keylen)
{
        struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
        struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
        struct dynamic_sa_ctl *sa;
        int    rc = 0;

        if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0)
                return -EINVAL;

        rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
        if (rc)
                return rc;

        if (ctx->sa_in || ctx->sa_out)
                crypto4xx_free_sa(ctx);

        rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
        if (rc)
                return rc;

        sa  = (struct dynamic_sa_ctl *) ctx->sa_in;

        sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
        set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
                                 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
                                 SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
                                 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
                                 SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
                                 DIR_INBOUND);
        set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
                                 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
                                 SA_SEQ_MASK_ON, SA_MC_DISABLE,
                                 SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
                                 SA_NOT_COPY_HDR);

        sa->sa_command_1.bf.key_len = keylen >> 3;

        crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
                                 key, keylen);

        rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
                key, keylen);
        if (rc) {
                pr_err("GCM hash key setting failed = %d\n", rc);
                goto err;
        }

        memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
        sa = (struct dynamic_sa_ctl *) ctx->sa_out;
        sa->sa_command_0.bf.dir = DIR_OUTBOUND;
        sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;

        return 0;
err:
        crypto4xx_free_sa(ctx);
        return rc;
}

static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
                                          bool decrypt)
{
        struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
        struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
        __le32 iv[4];
        unsigned int len = req->cryptlen;

        if (decrypt)
                len -= crypto_aead_authsize(crypto_aead_reqtfm(req));

        if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
                return crypto4xx_aead_fallback(req, ctx, decrypt);

        crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
        iv[3] = cpu_to_le32(1);

        return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
                                  len, iv, sizeof(iv),
                                  decrypt ? ctx->sa_in : ctx->sa_out,
                                  ctx->sa_len, req->assoclen, rctx->dst);
}

int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
{
        return crypto4xx_crypt_aes_gcm(req, false);
}

int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
{
        return crypto4xx_crypt_aes_gcm(req, true);
}