1856d673476e31c1dfe568777956036637d53902dKent Yoder/** 2856d673476e31c1dfe568777956036637d53902dKent Yoder * AES CBC routines supporting the Power 7+ Nest Accelerators driver 3856d673476e31c1dfe568777956036637d53902dKent Yoder * 4856d673476e31c1dfe568777956036637d53902dKent Yoder * Copyright (C) 2011-2012 International Business Machines Inc. 5856d673476e31c1dfe568777956036637d53902dKent Yoder * 6856d673476e31c1dfe568777956036637d53902dKent Yoder * This program is free software; you can redistribute it and/or modify 7856d673476e31c1dfe568777956036637d53902dKent Yoder * it under the terms of the GNU General Public License as published by 8856d673476e31c1dfe568777956036637d53902dKent Yoder * the Free Software Foundation; version 2 only. 9856d673476e31c1dfe568777956036637d53902dKent Yoder * 10856d673476e31c1dfe568777956036637d53902dKent Yoder * This program is distributed in the hope that it will be useful, 11856d673476e31c1dfe568777956036637d53902dKent Yoder * but WITHOUT ANY WARRANTY; without even the implied warranty of 12856d673476e31c1dfe568777956036637d53902dKent Yoder * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13856d673476e31c1dfe568777956036637d53902dKent Yoder * GNU General Public License for more details. 14856d673476e31c1dfe568777956036637d53902dKent Yoder * 15856d673476e31c1dfe568777956036637d53902dKent Yoder * You should have received a copy of the GNU General Public License 16856d673476e31c1dfe568777956036637d53902dKent Yoder * along with this program; if not, write to the Free Software 17856d673476e31c1dfe568777956036637d53902dKent Yoder * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18856d673476e31c1dfe568777956036637d53902dKent Yoder * 19856d673476e31c1dfe568777956036637d53902dKent Yoder * Author: Kent Yoder <yoder1@us.ibm.com> 20856d673476e31c1dfe568777956036637d53902dKent Yoder */ 21856d673476e31c1dfe568777956036637d53902dKent Yoder 22856d673476e31c1dfe568777956036637d53902dKent Yoder#include <crypto/aes.h> 23856d673476e31c1dfe568777956036637d53902dKent Yoder#include <crypto/algapi.h> 24856d673476e31c1dfe568777956036637d53902dKent Yoder#include <linux/module.h> 25856d673476e31c1dfe568777956036637d53902dKent Yoder#include <linux/types.h> 26856d673476e31c1dfe568777956036637d53902dKent Yoder#include <linux/crypto.h> 27856d673476e31c1dfe568777956036637d53902dKent Yoder#include <asm/vio.h> 28856d673476e31c1dfe568777956036637d53902dKent Yoder 29856d673476e31c1dfe568777956036637d53902dKent Yoder#include "nx_csbcpb.h" 30856d673476e31c1dfe568777956036637d53902dKent Yoder#include "nx.h" 31856d673476e31c1dfe568777956036637d53902dKent Yoder 32856d673476e31c1dfe568777956036637d53902dKent Yoder 33856d673476e31c1dfe568777956036637d53902dKent Yoderstatic int cbc_aes_nx_set_key(struct crypto_tfm *tfm, 34856d673476e31c1dfe568777956036637d53902dKent Yoder const u8 *in_key, 35856d673476e31c1dfe568777956036637d53902dKent Yoder unsigned int key_len) 36856d673476e31c1dfe568777956036637d53902dKent Yoder{ 37856d673476e31c1dfe568777956036637d53902dKent Yoder struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); 38856d673476e31c1dfe568777956036637d53902dKent Yoder struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 39856d673476e31c1dfe568777956036637d53902dKent Yoder 40856d673476e31c1dfe568777956036637d53902dKent Yoder nx_ctx_init(nx_ctx, HCOP_FC_AES); 41856d673476e31c1dfe568777956036637d53902dKent Yoder 42856d673476e31c1dfe568777956036637d53902dKent Yoder switch (key_len) { 43856d673476e31c1dfe568777956036637d53902dKent Yoder case AES_KEYSIZE_128: 44856d673476e31c1dfe568777956036637d53902dKent Yoder NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); 45856d673476e31c1dfe568777956036637d53902dKent Yoder nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; 46856d673476e31c1dfe568777956036637d53902dKent Yoder break; 47856d673476e31c1dfe568777956036637d53902dKent Yoder case AES_KEYSIZE_192: 48856d673476e31c1dfe568777956036637d53902dKent Yoder NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); 49856d673476e31c1dfe568777956036637d53902dKent Yoder nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; 50856d673476e31c1dfe568777956036637d53902dKent Yoder break; 51856d673476e31c1dfe568777956036637d53902dKent Yoder case AES_KEYSIZE_256: 52856d673476e31c1dfe568777956036637d53902dKent Yoder NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); 53856d673476e31c1dfe568777956036637d53902dKent Yoder nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; 54856d673476e31c1dfe568777956036637d53902dKent Yoder break; 55856d673476e31c1dfe568777956036637d53902dKent Yoder default: 56856d673476e31c1dfe568777956036637d53902dKent Yoder return -EINVAL; 57856d673476e31c1dfe568777956036637d53902dKent Yoder } 58856d673476e31c1dfe568777956036637d53902dKent Yoder 59856d673476e31c1dfe568777956036637d53902dKent Yoder csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC; 60856d673476e31c1dfe568777956036637d53902dKent Yoder memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len); 61856d673476e31c1dfe568777956036637d53902dKent Yoder 62856d673476e31c1dfe568777956036637d53902dKent Yoder return 0; 63856d673476e31c1dfe568777956036637d53902dKent Yoder} 64856d673476e31c1dfe568777956036637d53902dKent Yoder 65856d673476e31c1dfe568777956036637d53902dKent Yoderstatic int cbc_aes_nx_crypt(struct blkcipher_desc *desc, 66856d673476e31c1dfe568777956036637d53902dKent Yoder struct scatterlist *dst, 67856d673476e31c1dfe568777956036637d53902dKent Yoder struct scatterlist *src, 68856d673476e31c1dfe568777956036637d53902dKent Yoder unsigned int nbytes, 69856d673476e31c1dfe568777956036637d53902dKent Yoder int enc) 70856d673476e31c1dfe568777956036637d53902dKent Yoder{ 71856d673476e31c1dfe568777956036637d53902dKent Yoder struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); 72856d673476e31c1dfe568777956036637d53902dKent Yoder struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 73c849163b80c05f4567b1adef5db7f377460f88cdMarcelo Cerri unsigned long irq_flags; 742d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri unsigned int processed = 0, to_process; 752d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri u32 max_sg_len; 76856d673476e31c1dfe568777956036637d53902dKent Yoder int rc; 77856d673476e31c1dfe568777956036637d53902dKent Yoder 78c849163b80c05f4567b1adef5db7f377460f88cdMarcelo Cerri spin_lock_irqsave(&nx_ctx->lock, irq_flags); 79c849163b80c05f4567b1adef5db7f377460f88cdMarcelo Cerri 802d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg), 812d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri nx_ctx->ap->sglen); 82856d673476e31c1dfe568777956036637d53902dKent Yoder 83856d673476e31c1dfe568777956036637d53902dKent Yoder if (enc) 84856d673476e31c1dfe568777956036637d53902dKent Yoder NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; 85856d673476e31c1dfe568777956036637d53902dKent Yoder else 86856d673476e31c1dfe568777956036637d53902dKent Yoder NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; 87856d673476e31c1dfe568777956036637d53902dKent Yoder 882d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri do { 892d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri to_process = min_t(u64, nbytes - processed, 902d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri nx_ctx->ap->databytelen); 912d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri to_process = min_t(u64, to_process, 922d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri NX_PAGE_SIZE * (max_sg_len - 1)); 932d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri to_process = to_process & ~(AES_BLOCK_SIZE - 1); 942d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri 952d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process, 962d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri processed, csbcpb->cpb.aes_cbc.iv); 972d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri if (rc) 982d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri goto out; 992d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri 1002d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { 1012d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri rc = -EINVAL; 1022d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri goto out; 1032d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri } 1042d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri 1052d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 1062d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 1072d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri if (rc) 1082d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri goto out; 1092d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri 1102d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); 1112d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri atomic_inc(&(nx_ctx->stats->aes_ops)); 1122d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri atomic64_add(csbcpb->csb.processed_byte_count, 1132d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri &(nx_ctx->stats->aes_bytes)); 1142d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri 1152d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri processed += to_process; 1162d290f0240c682a5dddf6b9ba39460c82f9fdff1Marcelo Cerri } while (processed < nbytes); 117856d673476e31c1dfe568777956036637d53902dKent Yoderout: 118c849163b80c05f4567b1adef5db7f377460f88cdMarcelo Cerri spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); 119856d673476e31c1dfe568777956036637d53902dKent Yoder return rc; 120856d673476e31c1dfe568777956036637d53902dKent Yoder} 121856d673476e31c1dfe568777956036637d53902dKent Yoder 122856d673476e31c1dfe568777956036637d53902dKent Yoderstatic int cbc_aes_nx_encrypt(struct blkcipher_desc *desc, 123856d673476e31c1dfe568777956036637d53902dKent Yoder struct scatterlist *dst, 124856d673476e31c1dfe568777956036637d53902dKent Yoder struct scatterlist *src, 125856d673476e31c1dfe568777956036637d53902dKent Yoder unsigned int nbytes) 126856d673476e31c1dfe568777956036637d53902dKent Yoder{ 127856d673476e31c1dfe568777956036637d53902dKent Yoder return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1); 128856d673476e31c1dfe568777956036637d53902dKent Yoder} 129856d673476e31c1dfe568777956036637d53902dKent Yoder 130856d673476e31c1dfe568777956036637d53902dKent Yoderstatic int cbc_aes_nx_decrypt(struct blkcipher_desc *desc, 131856d673476e31c1dfe568777956036637d53902dKent Yoder struct scatterlist *dst, 132856d673476e31c1dfe568777956036637d53902dKent Yoder struct scatterlist *src, 133856d673476e31c1dfe568777956036637d53902dKent Yoder unsigned int nbytes) 134856d673476e31c1dfe568777956036637d53902dKent Yoder{ 135856d673476e31c1dfe568777956036637d53902dKent Yoder return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0); 136856d673476e31c1dfe568777956036637d53902dKent Yoder} 137856d673476e31c1dfe568777956036637d53902dKent Yoder 138856d673476e31c1dfe568777956036637d53902dKent Yoderstruct crypto_alg nx_cbc_aes_alg = { 139856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_name = "cbc(aes)", 140856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_driver_name = "cbc-aes-nx", 141856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_priority = 300, 142856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 143856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_blocksize = AES_BLOCK_SIZE, 144856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_ctxsize = sizeof(struct nx_crypto_ctx), 145856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_type = &crypto_blkcipher_type, 1461ad936e850a896bc16e0d72a56be432f9954ad7eKent Yoder .cra_alignmask = 0xf, 147856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_module = THIS_MODULE, 148856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_init = nx_crypto_ctx_aes_cbc_init, 149856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_exit = nx_crypto_ctx_exit, 150856d673476e31c1dfe568777956036637d53902dKent Yoder .cra_blkcipher = { 151856d673476e31c1dfe568777956036637d53902dKent Yoder .min_keysize = AES_MIN_KEY_SIZE, 152856d673476e31c1dfe568777956036637d53902dKent Yoder .max_keysize = AES_MAX_KEY_SIZE, 153856d673476e31c1dfe568777956036637d53902dKent Yoder .ivsize = AES_BLOCK_SIZE, 154856d673476e31c1dfe568777956036637d53902dKent Yoder .setkey = cbc_aes_nx_set_key, 155856d673476e31c1dfe568777956036637d53902dKent Yoder .encrypt = cbc_aes_nx_encrypt, 156856d673476e31c1dfe568777956036637d53902dKent Yoder .decrypt = cbc_aes_nx_decrypt, 157856d673476e31c1dfe568777956036637d53902dKent Yoder } 158856d673476e31c1dfe568777956036637d53902dKent Yoder}; 159