/** * AES CBC routines supporting the Power 7+ Nest Accelerators driver * * Copyright (C) 2011-2012 International Business Machines Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 only. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Author: Kent Yoder <yoder1@us.ibm.com> */ #include <crypto/aes.h> #include <crypto/algapi.h> #include <linux/module.h> #include <linux/types.h> #include <linux/crypto.h> #include <asm/vio.h> #include "nx_csbcpb.h" #include "nx.h" static int cbc_aes_nx_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; nx_ctx_init(nx_ctx, HCOP_FC_AES); switch (key_len) { case AES_KEYSIZE_128: NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; break; case AES_KEYSIZE_192: NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; break; case AES_KEYSIZE_256: NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; break; default: return -EINVAL; } csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC; memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len); return 0; } static int cbc_aes_nx_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes, int enc) { struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; unsigned long irq_flags; unsigned int processed = 0, to_process; u32 max_sg_len; int rc; spin_lock_irqsave(&nx_ctx->lock, irq_flags); max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg), nx_ctx->ap->sglen); if (enc) NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; else NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; do { to_process = min_t(u64, nbytes - processed, nx_ctx->ap->databytelen); to_process = min_t(u64, to_process, NX_PAGE_SIZE * (max_sg_len - 1)); to_process = to_process & ~(AES_BLOCK_SIZE - 1); rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process, processed, csbcpb->cpb.aes_cbc.iv); if (rc) goto out; if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { rc = -EINVAL; goto out; } rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); if (rc) goto out; memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); atomic_inc(&(nx_ctx->stats->aes_ops)); atomic64_add(csbcpb->csb.processed_byte_count, &(nx_ctx->stats->aes_bytes)); processed += to_process; } while (processed < nbytes); out: spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); return rc; } static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1); } static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0); } struct crypto_alg nx_cbc_aes_alg = { .cra_name = "cbc(aes)", .cra_driver_name = "cbc-aes-nx", .cra_priority = 300, .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct nx_crypto_ctx), .cra_type = &crypto_blkcipher_type, .cra_alignmask = 0xf, .cra_module = THIS_MODULE, .cra_init = nx_crypto_ctx_aes_cbc_init, .cra_exit = nx_crypto_ctx_exit, .cra_blkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = cbc_aes_nx_set_key, .encrypt = cbc_aes_nx_encrypt, .decrypt = cbc_aes_nx_decrypt, } };