354 lines
9.4 KiB
C
354 lines
9.4 KiB
C
/**
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* AES GCM routines supporting the Power 7+ Nest Accelerators driver
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*
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* Copyright (C) 2012 International Business Machines Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 only.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Author: Kent Yoder <yoder1@us.ibm.com>
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*/
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#include <crypto/internal/aead.h>
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/scatterwalk.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <asm/vio.h>
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#include "nx_csbcpb.h"
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#include "nx.h"
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static int gcm_aes_nx_set_key(struct crypto_aead *tfm,
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const u8 *in_key,
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unsigned int key_len)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
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struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
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struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
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nx_ctx_init(nx_ctx, HCOP_FC_AES);
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switch (key_len) {
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case AES_KEYSIZE_128:
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NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
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NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128);
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nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
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break;
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case AES_KEYSIZE_192:
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NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
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NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_192);
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nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
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break;
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case AES_KEYSIZE_256:
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NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
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NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_256);
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nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
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break;
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default:
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return -EINVAL;
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}
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csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM;
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memcpy(csbcpb->cpb.aes_gcm.key, in_key, key_len);
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csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_GCA;
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memcpy(csbcpb_aead->cpb.aes_gca.key, in_key, key_len);
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return 0;
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}
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static int gcm4106_aes_nx_set_key(struct crypto_aead *tfm,
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const u8 *in_key,
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unsigned int key_len)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
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char *nonce = nx_ctx->priv.gcm.nonce;
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int rc;
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if (key_len < 4)
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return -EINVAL;
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key_len -= 4;
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rc = gcm_aes_nx_set_key(tfm, in_key, key_len);
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if (rc)
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goto out;
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memcpy(nonce, in_key + key_len, 4);
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out:
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return rc;
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}
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static int gcm_aes_nx_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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if (authsize > crypto_aead_alg(tfm)->maxauthsize)
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return -EINVAL;
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crypto_aead_crt(tfm)->authsize = authsize;
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return 0;
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}
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static int gcm4106_aes_nx_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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switch (authsize) {
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case 8:
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case 12:
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case 16:
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break;
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default:
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return -EINVAL;
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}
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crypto_aead_crt(tfm)->authsize = authsize;
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return 0;
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}
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static int nx_gca(struct nx_crypto_ctx *nx_ctx,
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struct aead_request *req,
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u8 *out)
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{
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struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
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int rc = -EINVAL;
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struct scatter_walk walk;
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struct nx_sg *nx_sg = nx_ctx->in_sg;
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if (req->assoclen > nx_ctx->ap->databytelen)
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goto out;
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if (req->assoclen <= AES_BLOCK_SIZE) {
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scatterwalk_start(&walk, req->assoc);
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scatterwalk_copychunks(out, &walk, req->assoclen,
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SCATTERWALK_FROM_SG);
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scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0);
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rc = 0;
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goto out;
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}
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nx_sg = nx_walk_and_build(nx_sg, nx_ctx->ap->sglen, req->assoc, 0,
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req->assoclen);
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nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) * sizeof(struct nx_sg);
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rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
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req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto out;
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
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memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE);
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out:
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return rc;
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}
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static int gcm_aes_nx_crypt(struct aead_request *req, int enc)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
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struct blkcipher_desc desc;
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unsigned int nbytes = req->cryptlen;
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int rc = -EINVAL;
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if (nbytes > nx_ctx->ap->databytelen)
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goto out;
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desc.info = nx_ctx->priv.gcm.iv;
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/* initialize the counter */
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*(u32 *)(desc.info + NX_GCM_CTR_OFFSET) = 1;
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/* For scenarios where the input message is zero length, AES CTR mode
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* may be used. Set the source data to be a single block (16B) of all
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* zeros, and set the input IV value to be the same as the GMAC IV
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* value. - nx_wb 4.8.1.3 */
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if (nbytes == 0) {
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char src[AES_BLOCK_SIZE] = {};
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struct scatterlist sg;
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desc.tfm = crypto_alloc_blkcipher("ctr(aes)", 0, 0);
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if (IS_ERR(desc.tfm)) {
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rc = -ENOMEM;
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goto out;
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}
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crypto_blkcipher_setkey(desc.tfm, csbcpb->cpb.aes_gcm.key,
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NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_128 ? 16 :
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NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_192 ? 24 : 32);
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sg_init_one(&sg, src, AES_BLOCK_SIZE);
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if (enc)
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crypto_blkcipher_encrypt_iv(&desc, req->dst, &sg,
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AES_BLOCK_SIZE);
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else
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crypto_blkcipher_decrypt_iv(&desc, req->dst, &sg,
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AES_BLOCK_SIZE);
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crypto_free_blkcipher(desc.tfm);
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rc = 0;
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goto out;
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}
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desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
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csbcpb->cpb.aes_gcm.bit_length_aad = req->assoclen * 8;
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if (req->assoclen) {
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rc = nx_gca(nx_ctx, req, csbcpb->cpb.aes_gcm.in_pat_or_aad);
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if (rc)
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goto out;
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}
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if (enc)
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NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
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else
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nbytes -= AES_BLOCK_SIZE;
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csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
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rc = nx_build_sg_lists(nx_ctx, &desc, req->dst, req->src, nbytes,
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csbcpb->cpb.aes_gcm.iv_or_cnt);
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if (rc)
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goto out;
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rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
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req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto out;
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(csbcpb->csb.processed_byte_count,
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&(nx_ctx->stats->aes_bytes));
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if (enc) {
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/* copy out the auth tag */
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scatterwalk_map_and_copy(csbcpb->cpb.aes_gcm.out_pat_or_mac,
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req->dst, nbytes,
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crypto_aead_authsize(crypto_aead_reqtfm(req)),
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SCATTERWALK_TO_SG);
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} else if (req->assoclen) {
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u8 *itag = nx_ctx->priv.gcm.iauth_tag;
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u8 *otag = csbcpb->cpb.aes_gcm.out_pat_or_mac;
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scatterwalk_map_and_copy(itag, req->dst, nbytes,
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crypto_aead_authsize(crypto_aead_reqtfm(req)),
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SCATTERWALK_FROM_SG);
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rc = memcmp(itag, otag,
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crypto_aead_authsize(crypto_aead_reqtfm(req))) ?
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-EBADMSG : 0;
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}
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out:
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return rc;
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}
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static int gcm_aes_nx_encrypt(struct aead_request *req)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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char *iv = nx_ctx->priv.gcm.iv;
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memcpy(iv, req->iv, 12);
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return gcm_aes_nx_crypt(req, 1);
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}
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static int gcm_aes_nx_decrypt(struct aead_request *req)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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char *iv = nx_ctx->priv.gcm.iv;
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memcpy(iv, req->iv, 12);
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return gcm_aes_nx_crypt(req, 0);
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}
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static int gcm4106_aes_nx_encrypt(struct aead_request *req)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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char *iv = nx_ctx->priv.gcm.iv;
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char *nonce = nx_ctx->priv.gcm.nonce;
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memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
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memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
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return gcm_aes_nx_crypt(req, 1);
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}
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static int gcm4106_aes_nx_decrypt(struct aead_request *req)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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char *iv = nx_ctx->priv.gcm.iv;
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char *nonce = nx_ctx->priv.gcm.nonce;
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memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
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memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
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return gcm_aes_nx_crypt(req, 0);
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}
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/* tell the block cipher walk routines that this is a stream cipher by
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* setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
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* during encrypt/decrypt doesn't solve this problem, because it calls
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* blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
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* but instead uses this tfm->blocksize. */
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struct crypto_alg nx_gcm_aes_alg = {
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.cra_name = "gcm(aes)",
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.cra_driver_name = "gcm-aes-nx",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_AEAD,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct nx_crypto_ctx),
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.cra_type = &crypto_aead_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(nx_gcm_aes_alg.cra_list),
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.cra_init = nx_crypto_ctx_aes_gcm_init,
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.cra_exit = nx_crypto_ctx_exit,
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.cra_aead = {
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.ivsize = AES_BLOCK_SIZE,
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.maxauthsize = AES_BLOCK_SIZE,
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.setkey = gcm_aes_nx_set_key,
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.setauthsize = gcm_aes_nx_setauthsize,
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.encrypt = gcm_aes_nx_encrypt,
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.decrypt = gcm_aes_nx_decrypt,
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}
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};
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struct crypto_alg nx_gcm4106_aes_alg = {
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.cra_name = "rfc4106(gcm(aes))",
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.cra_driver_name = "rfc4106-gcm-aes-nx",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_AEAD,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct nx_crypto_ctx),
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.cra_type = &crypto_nivaead_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(nx_gcm4106_aes_alg.cra_list),
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.cra_init = nx_crypto_ctx_aes_gcm_init,
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.cra_exit = nx_crypto_ctx_exit,
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.cra_aead = {
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.ivsize = 8,
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.maxauthsize = AES_BLOCK_SIZE,
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.geniv = "seqiv",
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.setkey = gcm4106_aes_nx_set_key,
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.setauthsize = gcm4106_aes_nx_setauthsize,
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.encrypt = gcm4106_aes_nx_encrypt,
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.decrypt = gcm4106_aes_nx_decrypt,
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}
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};
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