// SPDX-License-Identifier: GPL-2.0-only
/*
* AES GCM routines supporting the Power 7+ Nest Accelerators driver
*
* Copyright (C) 2012 International Business Machines Inc.
*
* Author: Kent Yoder <[email protected]>
*/
#include <crypto/internal/aead.h>
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/gcm.h>
#include <crypto/scatterwalk.h>
#include <linux/module.h>
#include <linux/types.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_aead_ctx(tfm);
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:
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
NX_CPB_SET_KEY_SIZE(csbcpb_aead, 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_CPB_SET_KEY_SIZE(csbcpb_aead, 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_CPB_SET_KEY_SIZE(csbcpb_aead, 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_aead_ctx(tfm);
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 gcm4106_aes_nx_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
{
switch (authsize) {
case 8:
case 12:
case 16:
break;
default:
return -EINVAL;
}
return 0;
}
static int nx_gca(struct nx_crypto_ctx *nx_ctx,
struct aead_request *req,
u8 *out,
unsigned int assoclen)
{
int rc;
struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
struct scatter_walk walk;
struct nx_sg *nx_sg = nx_ctx->in_sg;
unsigned int nbytes = assoclen;
unsigned int processed = 0, to_process;
unsigned int max_sg_len;
if (nbytes <= AES_BLOCK_SIZE) {
scatterwalk_start(&walk, req->src);
scatterwalk_copychunks(out, &walk, nbytes, SCATTERWALK_FROM_SG);
scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0);
return 0;
}
NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_CONTINUATION;
/* page_limit: number of sg entries that fit on one page */
max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
nx_ctx->ap->sglen);
max_sg_len = min_t(u64, max_sg_len,
nx_ctx->ap->databytelen/NX_PAGE_SIZE);
do {
/*
* to_process: the data chunk to process in this update.
* This value is bound by sg list limits.
*/
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));
nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len,
req->src, processed, &to_process);
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb_aead) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_INTERMEDIATE;
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,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
return rc;
memcpy(csbcpb_aead->cpb.aes_gca.in_pat,
csbcpb_aead->cpb.aes_gca.out_pat,
AES_BLOCK_SIZE);
NX_CPB_FDM(csbcpb_aead) |= NX_FDM_CONTINUATION;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(assoclen, &(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < nbytes);
memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE);
return rc;
}
static int gmac(struct aead_request *req, const u8 *iv, unsigned int assoclen)
{
int rc;
struct nx_crypto_ctx *nx_ctx =
crypto_aead_ctx(crypto_aead_reqtfm(req));
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
struct nx_sg *nx_sg;
unsigned int nbytes = assoclen;
unsigned int processed = 0, to_process;
unsigned int max_sg_len;
/* Set GMAC mode */
csbcpb->cpb.hdr.mode = NX_MODE_AES_GMAC;
NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
/* page_limit: number of sg entries that fit on one page */
max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
nx_ctx->ap->sglen);
max_sg_len = min_t(u64, max_sg_len,
nx_ctx->ap->databytelen/NX_PAGE_SIZE);
/* Copy IV */
memcpy(csbcpb->cpb.aes_gcm.iv_or_cnt, iv, AES_BLOCK_SIZE);
do {
/*
* to_process: the data chunk to process in this update.
* This value is bound by sg list limits.
*/
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));
nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len,
req->src, processed, &to_process);
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
nx_ctx->op.inlen = (nx_ctx->in_sg - nx_sg)
* sizeof(struct nx_sg);
csbcpb->cpb.aes_gcm.bit_length_data = 0;
csbcpb->cpb.aes_gcm.bit_length_aad = 8 * nbytes;
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
memcpy(csbcpb->cpb.aes_gcm.in_pat_or_aad,
csbcpb->cpb.aes_gcm.out_pat_or_mac, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_gcm.in_s0,
csbcpb->cpb.aes_gcm.out_s0, AES_BLOCK_SIZE);
NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(assoclen, &(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < nbytes);
out:
/* Restore GCM mode */
csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM;
return rc;
}
static int gcm_empty(struct aead_request *req, const u8 *iv, int enc)
{
int rc;
struct nx_crypto_ctx *nx_ctx =
crypto_aead_ctx(crypto_aead_reqtfm(req));
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
char out[AES_BLOCK_SIZE];
struct nx_sg *in_sg, *out_sg;
int len;
/* 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 */
/* Change to ECB mode */
csbcpb->cpb.hdr.mode = NX_MODE_AES_ECB;
memcpy(csbcpb->cpb.aes_ecb.key, csbcpb->cpb.aes_gcm.key,
sizeof(csbcpb->cpb.aes_ecb.key));
if (enc)
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
len = AES_BLOCK_SIZE;
/* Encrypt the counter/IV */
in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) iv,
&len, nx_ctx->ap->sglen);
if (len != AES_BLOCK_SIZE)
return -EINVAL;
len = sizeof(out);
out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *) out, &len,
nx_ctx->ap->sglen);
if (len != sizeof(out))
return -EINVAL;
nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
atomic_inc(&(nx_ctx->stats->aes_ops));
/* Copy out the auth tag */
memcpy(csbcpb->cpb.aes_gcm.out_pat_or_mac, out,
crypto_aead_authsize(crypto_aead_reqtfm(req)));
out:
/* Restore XCBC mode */
csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM;
/*
* ECB key uses the same region that GCM AAD and counter, so it's safe
* to just fill it with zeroes.
*/
memset(csbcpb->cpb.aes_ecb.key, 0, sizeof(csbcpb->cpb.aes_ecb.key));
return rc;
}
static int gcm_aes_nx_crypt(struct aead_request *req, int enc,
unsigned int assoclen)
{
struct nx_crypto_ctx *nx_ctx =
crypto_aead_ctx(crypto_aead_reqtfm(req));
struct nx_gcm_rctx *rctx = aead_request_ctx(req);
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
unsigned int nbytes = req->cryptlen;
unsigned int processed = 0, to_process;
unsigned long irq_flags;
int rc = -EINVAL;
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
/* initialize the counter */
*(u32 *)&rctx->iv[NX_GCM_CTR_OFFSET] = 1;
if (nbytes == 0) {
if (assoclen == 0)
rc = gcm_empty(req, rctx->iv, enc);
else
rc = gmac(req, rctx->iv, assoclen);
if (rc)
goto out;
else
goto mac;
}
/* Process associated data */
csbcpb->cpb.aes_gcm.bit_length_aad = assoclen * 8;
if (assoclen) {
rc = nx_gca(nx_ctx, req, csbcpb->cpb.aes_gcm.in_pat_or_aad,
assoclen);
if (rc)
goto out;
}
/* Set flags for encryption */
NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
if (enc) {
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
} else {
NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
nbytes -= crypto_aead_authsize(crypto_aead_reqtfm(req));
}
do {
to_process = nbytes - processed;
csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
rc = nx_build_sg_lists(nx_ctx, rctx->iv, req->dst,
req->src, &to_process,
processed + req->assoclen,
csbcpb->cpb.aes_gcm.iv_or_cnt);
if (rc)
goto out;
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
memcpy(rctx->iv, csbcpb->cpb.aes_gcm.out_cnt, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_gcm.in_pat_or_aad,
csbcpb->cpb.aes_gcm.out_pat_or_mac, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_gcm.in_s0,
csbcpb->cpb.aes_gcm.out_s0, AES_BLOCK_SIZE);
NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),
&(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < nbytes);
mac:
if (enc) {
/* copy out the auth tag */
scatterwalk_map_and_copy(
csbcpb->cpb.aes_gcm.out_pat_or_mac,
req->dst, req->assoclen + nbytes,
crypto_aead_authsize(crypto_aead_reqtfm(req)),
SCATTERWALK_TO_SG);
} else {
u8 *itag = nx_ctx->priv.gcm.iauth_tag;
u8 *otag = csbcpb->cpb.aes_gcm.out_pat_or_mac;
scatterwalk_map_and_copy(
itag, req->src, req->assoclen + nbytes,
crypto_aead_authsize(crypto_aead_reqtfm(req)),
SCATTERWALK_FROM_SG);
rc = crypto_memneq(itag, otag,
crypto_aead_authsize(crypto_aead_reqtfm(req))) ?
-EBADMSG : 0;
}
out:
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return rc;
}
static int gcm_aes_nx_encrypt(struct aead_request *req)
{
struct nx_gcm_rctx *rctx = aead_request_ctx(req);
char *iv = rctx->iv;
memcpy(iv, req->iv, GCM_AES_IV_SIZE);
return gcm_aes_nx_crypt(req, 1, req->assoclen);
}
static int gcm_aes_nx_decrypt(struct aead_request *req)
{
struct nx_gcm_rctx *rctx = aead_request_ctx(req);
char *iv = rctx->iv;
memcpy(iv, req->iv, GCM_AES_IV_SIZE);
return gcm_aes_nx_crypt(req, 0, req->assoclen);
}
static int gcm4106_aes_nx_encrypt(struct aead_request *req)
{
struct nx_crypto_ctx *nx_ctx =
crypto_aead_ctx(crypto_aead_reqtfm(req));
struct nx_gcm_rctx *rctx = aead_request_ctx(req);
char *iv = rctx->iv;
char *nonce = nx_ctx->priv.gcm.nonce;
memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
if (req->assoclen < 8)
return -EINVAL;
return gcm_aes_nx_crypt(req, 1, req->assoclen - 8);
}
static int gcm4106_aes_nx_decrypt(struct aead_request *req)
{
struct nx_crypto_ctx *nx_ctx =
crypto_aead_ctx(crypto_aead_reqtfm(req));
struct nx_gcm_rctx *rctx = aead_request_ctx(req);
char *iv = rctx->iv;
char *nonce = nx_ctx->priv.gcm.nonce;
memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
if (req->assoclen < 8)
return -EINVAL;
return gcm_aes_nx_crypt(req, 0, req->assoclen - 8);
}
struct aead_alg nx_gcm_aes_alg = {
.base = {
.cra_name = "gcm(aes)",
.cra_driver_name = "gcm-aes-nx",
.cra_priority = 300,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct nx_crypto_ctx),
.cra_module = THIS_MODULE,
},
.init = nx_crypto_ctx_aes_gcm_init,
.exit = nx_crypto_ctx_aead_exit,
.ivsize = GCM_AES_IV_SIZE,
.maxauthsize = AES_BLOCK_SIZE,
.setkey = gcm_aes_nx_set_key,
.encrypt = gcm_aes_nx_encrypt,
.decrypt = gcm_aes_nx_decrypt,
};
struct aead_alg nx_gcm4106_aes_alg = {
.base = {
.cra_name = "rfc4106(gcm(aes))",
.cra_driver_name = "rfc4106-gcm-aes-nx",
.cra_priority = 300,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct nx_crypto_ctx),
.cra_module = THIS_MODULE,
},
.init = nx_crypto_ctx_aes_gcm_init,
.exit = nx_crypto_ctx_aead_exit,
.ivsize = GCM_RFC4106_IV_SIZE,
.maxauthsize = AES_BLOCK_SIZE,
.setkey = gcm4106_aes_nx_set_key,
.setauthsize = gcm4106_aes_nx_setauthsize,
.encrypt = gcm4106_aes_nx_encrypt,
.decrypt = gcm4106_aes_nx_decrypt,
};
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