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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AES CTR routines supporting the Power 7+ Nest Accelerators driver4 *5 * Copyright (C) 2011-2012 International Business Machines Inc.6 *7 * Author: Kent Yoder <yoder1@us.ibm.com>8 */9 10#include <crypto/aes.h>11#include <crypto/ctr.h>12#include <crypto/algapi.h>13#include <linux/module.h>14#include <linux/types.h>15#include <linux/crypto.h>16#include <asm/vio.h>17 18#include "nx_csbcpb.h"19#include "nx.h"20 21 22static int ctr_aes_nx_set_key(struct crypto_skcipher *tfm,23 const u8 *in_key,24 unsigned int key_len)25{26 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);27 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;28 29 nx_ctx_init(nx_ctx, HCOP_FC_AES);30 31 switch (key_len) {32 case AES_KEYSIZE_128:33 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);34 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];35 break;36 case AES_KEYSIZE_192:37 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);38 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];39 break;40 case AES_KEYSIZE_256:41 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);42 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];43 break;44 default:45 return -EINVAL;46 }47 48 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;49 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);50 51 return 0;52}53 54static int ctr3686_aes_nx_set_key(struct crypto_skcipher *tfm,55 const u8 *in_key,56 unsigned int key_len)57{58 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);59 60 if (key_len < CTR_RFC3686_NONCE_SIZE)61 return -EINVAL;62 63 memcpy(nx_ctx->priv.ctr.nonce,64 in_key + key_len - CTR_RFC3686_NONCE_SIZE,65 CTR_RFC3686_NONCE_SIZE);66 67 key_len -= CTR_RFC3686_NONCE_SIZE;68 69 return ctr_aes_nx_set_key(tfm, in_key, key_len);70}71 72static int ctr_aes_nx_crypt(struct skcipher_request *req, u8 *iv)73{74 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);75 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);76 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;77 unsigned long irq_flags;78 unsigned int processed = 0, to_process;79 int rc;80 81 spin_lock_irqsave(&nx_ctx->lock, irq_flags);82 83 do {84 to_process = req->cryptlen - processed;85 86 rc = nx_build_sg_lists(nx_ctx, iv, req->dst, req->src,87 &to_process, processed,88 csbcpb->cpb.aes_ctr.iv);89 if (rc)90 goto out;91 92 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {93 rc = -EINVAL;94 goto out;95 }96 97 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,98 req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);99 if (rc)100 goto out;101 102 memcpy(iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);103 104 atomic_inc(&(nx_ctx->stats->aes_ops));105 atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),106 &(nx_ctx->stats->aes_bytes));107 108 processed += to_process;109 } while (processed < req->cryptlen);110out:111 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);112 return rc;113}114 115static int ctr3686_aes_nx_crypt(struct skcipher_request *req)116{117 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);118 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);119 u8 iv[16];120 121 memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_NONCE_SIZE);122 memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE);123 iv[12] = iv[13] = iv[14] = 0;124 iv[15] = 1;125 126 return ctr_aes_nx_crypt(req, iv);127}128 129struct skcipher_alg nx_ctr3686_aes_alg = {130 .base.cra_name = "rfc3686(ctr(aes))",131 .base.cra_driver_name = "rfc3686-ctr-aes-nx",132 .base.cra_priority = 300,133 .base.cra_blocksize = 1,134 .base.cra_ctxsize = sizeof(struct nx_crypto_ctx),135 .base.cra_module = THIS_MODULE,136 .init = nx_crypto_ctx_aes_ctr_init,137 .exit = nx_crypto_ctx_skcipher_exit,138 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,139 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,140 .ivsize = CTR_RFC3686_IV_SIZE,141 .setkey = ctr3686_aes_nx_set_key,142 .encrypt = ctr3686_aes_nx_crypt,143 .decrypt = ctr3686_aes_nx_crypt,144 .chunksize = AES_BLOCK_SIZE,145};146