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    Subject[PATCH 10/17] powerpc: crypto: AES-GCM mode routines for nx encryption
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    These routines add support for AES in GCM mode on the Power7+ CPU's
    in-Nest accelerator driver.

    Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
    ---
    arch/powerpc/crypto/nx/nx-aes-gcm.c | 352 +++++++++++++++++++++++++++++++++++
    1 files changed, 352 insertions(+), 0 deletions(-)
    create mode 100644 arch/powerpc/crypto/nx/nx-aes-gcm.c

    diff --git a/arch/powerpc/crypto/nx/nx-aes-gcm.c b/arch/powerpc/crypto/nx/nx-aes-gcm.c
    new file mode 100644
    index 0000000..c336ef4
    --- /dev/null
    +++ b/arch/powerpc/crypto/nx/nx-aes-gcm.c
    @@ -0,0 +1,352 @@
    +/**
    + * AES GCM routines supporting the Power 7+ Nest Accelerators driver
    + *
    + * Copyright (C) 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/internal/aead.h>
    +#include <crypto/aes.h>
    +#include <crypto/algapi.h>
    +#include <crypto/scatterwalk.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 gcm_aes_nx_set_key(struct crypto_aead *tfm,
    + const u8 *in_key,
    + unsigned int key_len)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
    + struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
    + struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
    +
    + nx_ctx_init(nx_ctx, HCOP_FC_AES);
    +
    + switch (key_len) {
    + case AES_KEYSIZE_128:
    + csbcpb->cpb.hdr.key_size = NX_KS_AES_128;
    + csbcpb_aead->cpb.hdr.key_size = NX_KS_AES_128;
    + nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
    + break;
    + case AES_KEYSIZE_192:
    + csbcpb->cpb.hdr.key_size = NX_KS_AES_192;
    + csbcpb_aead->cpb.hdr.key_size = NX_KS_AES_192;
    + nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
    + break;
    + case AES_KEYSIZE_256:
    + csbcpb->cpb.hdr.key_size = NX_KS_AES_256;
    + csbcpb_aead->cpb.hdr.key_size = 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_GCM;
    + memcpy(csbcpb->cpb.aes_gcm.key, in_key, key_len);
    +
    + csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_GCA;
    + memcpy(csbcpb_aead->cpb.aes_gca.key, in_key, key_len);
    +
    + return 0;
    +}
    +
    +static int gcm4106_aes_nx_set_key(struct crypto_aead *tfm,
    + const u8 *in_key,
    + unsigned int key_len)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
    + char *nonce = nx_ctx->priv.gcm.nonce;
    + int rc;
    +
    + if (key_len < 4)
    + return -EINVAL;
    +
    + key_len -= 4;
    +
    + rc = gcm_aes_nx_set_key(tfm, in_key, key_len);
    + if (rc)
    + goto out;
    +
    + memcpy(nonce, in_key + key_len, 4);
    +out:
    + return rc;
    +}
    +
    +static int gcm_aes_nx_setauthsize(struct crypto_aead *tfm,
    + unsigned int authsize)
    +{
    + if (authsize > crypto_aead_alg(tfm)->maxauthsize)
    + return -EINVAL;
    +
    + crypto_aead_crt(tfm)->authsize = authsize;
    +
    + return 0;
    +}
    +
    +static int gcm4106_aes_nx_setauthsize(struct crypto_aead *tfm,
    + unsigned int authsize)
    +{
    + switch (authsize) {
    + case 8:
    + case 12:
    + case 16:
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + crypto_aead_crt(tfm)->authsize = authsize;
    +
    + return 0;
    +}
    +
    +static int nx_gca(struct nx_crypto_ctx *nx_ctx,
    + struct scatterlist *assoc,
    + unsigned int assoclen,
    + u8 *out)
    +{
    + struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
    + int rc;
    + struct scatter_walk walk;
    + struct nx_sg *nx_sg = nx_ctx->in_sg;
    +
    + if (assoclen > nx_ctx->ap->databytelen)
    + return -EINVAL;
    +
    + if (assoclen <= AES_BLOCK_SIZE) {
    + scatterwalk_start(&walk, assoc);
    + scatterwalk_copychunks(out, &walk, assoclen,
    + SCATTERWALK_FROM_SG);
    + scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0);
    +
    + return 0;
    + }
    +
    + nx_sg = nx_walk_and_build(nx_sg, nx_ctx->ap->sglen, assoc, 0,
    + assoclen);
    + nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) * sizeof(struct nx_sg);
    +
    + rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead);
    + if (rc)
    + goto out;
    +
    + atomic_inc(&(nx_ctx->stats->aes_ops));
    + atomic64_add(assoclen, &(nx_ctx->stats->aes_bytes));
    +
    + memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE);
    +out:
    + return rc;
    +}
    +
    +static int gcm_aes_nx_crypt(struct aead_request *req, int enc)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
    + struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
    + struct blkcipher_desc desc;
    + unsigned int nbytes = req->cryptlen;
    + int rc = -1;
    +
    + if (nbytes > nx_ctx->ap->databytelen)
    + return -EINVAL;
    +
    + desc.info = nx_ctx->priv.gcm.iv;
    + /* initialize the counter */
    + *(u32 *)(desc.info + NX_GCM_CTR_OFFSET) = 1;
    +
    + /* For scenarios where the input message is zero length, AES CTR mode
    + * may be used. Set the source data to be a single block (16B) of all
    + * zeros, and set the input IV value to be the same as the GMAC IV
    + * value. - nx_wb 4.8.1.3 */
    + if (nbytes == 0) {
    + char src[AES_BLOCK_SIZE] = {};
    + struct scatterlist sg;
    +
    + desc.tfm = crypto_alloc_blkcipher("ctr(aes)", 0, 0);
    + if (IS_ERR(desc.tfm)) {
    + rc = -ENOMEM;
    + goto out;
    + }
    +
    + crypto_blkcipher_setkey(desc.tfm, csbcpb->cpb.aes_gcm.key,
    + csbcpb->cpb.hdr.key_size == NX_KS_AES_128 ? 16 :
    + csbcpb->cpb.hdr.key_size == NX_KS_AES_192 ? 24 : 32);
    +
    + sg_init_one(&sg, src, AES_BLOCK_SIZE);
    + if (enc)
    + crypto_blkcipher_encrypt_iv(&desc, req->dst, &sg,
    + AES_BLOCK_SIZE);
    + else
    + crypto_blkcipher_decrypt_iv(&desc, req->dst, &sg,
    + AES_BLOCK_SIZE);
    + crypto_free_blkcipher(desc.tfm);
    +
    + rc = 0;
    + goto out;
    + }
    +
    + desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
    +
    + csbcpb->cpb.aes_gcm.bit_length_aad = req->assoclen * 8;
    +
    + if (req->assoclen) {
    + rc = nx_gca(nx_ctx, req->assoc, req->assoclen,
    + csbcpb->cpb.aes_gcm.in_pat_or_aad);
    + if (rc)
    + goto out;
    + }
    +
    + if (enc)
    + csbcpb->cpb.hdr.fdm.ende = NX_FDM_ENDE_ENCRYPT;
    + else
    + nbytes -= AES_BLOCK_SIZE;
    +
    + csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
    +
    + rc = nx_build_sg_lists(nx_ctx, &desc, req->dst, req->src, nbytes,
    + csbcpb->cpb.aes_gcm.iv_or_cnt);
    + if (rc)
    + goto out;
    +
    + rc = nx_hcall_sync(nx_ctx, &nx_ctx->op);
    + if (rc)
    + goto out;
    +
    + atomic_inc(&(nx_ctx->stats->aes_ops));
    + atomic64_add(csbcpb->csb.processed_byte_count,
    + &(nx_ctx->stats->aes_bytes));
    +
    + if (enc) {
    + /* copy out the auth tag */
    + scatterwalk_map_and_copy(csbcpb->cpb.aes_gcm.out_pat_or_mac,
    + req->dst, nbytes,
    + crypto_aead_authsize(crypto_aead_reqtfm(req)),
    + SCATTERWALK_TO_SG);
    + } else if (req->assoclen) {
    + u8 *itag = nx_ctx->priv.gcm.iauth_tag;
    + u8 *otag = csbcpb->cpb.aes_gcm.out_pat_or_mac;
    +
    + scatterwalk_map_and_copy(itag, req->dst, nbytes,
    + crypto_aead_authsize(crypto_aead_reqtfm(req)),
    + SCATTERWALK_FROM_SG);
    + rc = memcmp(itag, otag,
    + crypto_aead_authsize(crypto_aead_reqtfm(req))) ?
    + -EBADMSG : 0;
    + }
    +out:
    + return rc;
    +}
    +
    +static int gcm_aes_nx_encrypt(struct aead_request *req)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
    + char *iv = nx_ctx->priv.gcm.iv;
    +
    + memcpy(iv, req->iv, 12);
    +
    + return gcm_aes_nx_crypt(req, 1);
    +}
    +
    +static int gcm_aes_nx_decrypt(struct aead_request *req)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
    + char *iv = nx_ctx->priv.gcm.iv;
    +
    + memcpy(iv, req->iv, 12);
    +
    + return gcm_aes_nx_crypt(req, 0);
    +}
    +
    +static int gcm4106_aes_nx_encrypt(struct aead_request *req)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
    + char *iv = nx_ctx->priv.gcm.iv;
    + char *nonce = nx_ctx->priv.gcm.nonce;
    +
    + memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
    + memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
    +
    + return gcm_aes_nx_crypt(req, 1);
    +}
    +
    +static int gcm4106_aes_nx_decrypt(struct aead_request *req)
    +{
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
    + char *iv = nx_ctx->priv.gcm.iv;
    + char *nonce = nx_ctx->priv.gcm.nonce;
    +
    + memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
    + memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
    +
    + return gcm_aes_nx_crypt(req, 0);
    +}
    +
    +/* tell the block cipher walk routines that this is a stream cipher by
    + * setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
    + * during encrypt/decrypt doesn't solve this problem, because it calls
    + * blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
    + * but instead uses this tfm->blocksize. */
    +struct crypto_alg nx_gcm_aes_alg = {
    + .cra_name = "gcm(aes)",
    + .cra_driver_name = "gcm-aes-nx",
    + .cra_priority = 300,
    + .cra_flags = CRYPTO_ALG_TYPE_AEAD,
    + .cra_blocksize = 1,
    + .cra_ctxsize = sizeof(struct nx_crypto_ctx),
    + .cra_type = &crypto_aead_type,
    + .cra_module = THIS_MODULE,
    + .cra_list = LIST_HEAD_INIT(nx_gcm_aes_alg.cra_list),
    + .cra_init = nx_crypto_ctx_aes_gcm_init,
    + .cra_exit = nx_crypto_ctx_exit,
    + .cra_aead = {
    + .ivsize = AES_BLOCK_SIZE,
    + .maxauthsize = AES_BLOCK_SIZE,
    + .setkey = gcm_aes_nx_set_key,
    + .setauthsize = gcm_aes_nx_setauthsize,
    + .encrypt = gcm_aes_nx_encrypt,
    + .decrypt = gcm_aes_nx_decrypt,
    + }
    +};
    +
    +struct crypto_alg nx_gcm4106_aes_alg = {
    + .cra_name = "rfc4106(gcm(aes))",
    + .cra_driver_name = "rfc4106-gcm-aes-nx",
    + .cra_priority = 300,
    + .cra_flags = CRYPTO_ALG_TYPE_AEAD,
    + .cra_blocksize = 1,
    + .cra_ctxsize = sizeof(struct nx_crypto_ctx),
    + .cra_type = &crypto_nivaead_type,
    + .cra_module = THIS_MODULE,
    + .cra_list = LIST_HEAD_INIT(nx_gcm4106_aes_alg.cra_list),
    + .cra_init = nx_crypto_ctx_aes_gcm_init,
    + .cra_exit = nx_crypto_ctx_exit,
    + .cra_aead = {
    + .ivsize = 8,
    + .maxauthsize = AES_BLOCK_SIZE,
    + .geniv = "seqiv",
    + .setkey = gcm4106_aes_nx_set_key,
    + .setauthsize = gcm4106_aes_nx_setauthsize,
    + .encrypt = gcm4106_aes_nx_encrypt,
    + .decrypt = gcm4106_aes_nx_decrypt,
    + }
    +};
    --
    1.7.1



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