425 lines
11 KiB
C
425 lines
11 KiB
C
|
/*
|
||
|
|
* AMD Cryptographic Coprocessor (CCP) AES CMAC crypto API support
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013 Advanced Micro Devices, Inc.
|
||
|
|
*
|
||
|
|
* Author: Tom Lendacky <thomas.lendacky@amd.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/scatterlist.h>
|
||
|
|
#include <linux/crypto.h>
|
||
|
|
#include <crypto/algapi.h>
|
||
|
|
#include <crypto/aes.h>
|
||
|
|
#include <crypto/hash.h>
|
||
|
|
#include <crypto/internal/hash.h>
|
||
|
|
#include <crypto/scatterwalk.h>
|
||
|
|
|
||
|
|
#include "ccp-crypto.h"
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_complete(struct crypto_async_request *async_req,
|
||
|
|
int ret)
|
||
|
|
{
|
||
|
|
struct ahash_request *req = ahash_request_cast(async_req);
|
||
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
||
|
|
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
|
||
|
|
unsigned int digest_size = crypto_ahash_digestsize(tfm);
|
||
|
|
|
||
|
|
if (ret)
|
||
|
|
goto e_free;
|
||
|
|
|
||
|
|
if (rctx->hash_rem) {
|
||
|
|
/* Save remaining data to buffer */
|
||
|
|
unsigned int offset = rctx->nbytes - rctx->hash_rem;
|
||
|
|
|
||
|
|
scatterwalk_map_and_copy(rctx->buf, rctx->src,
|
||
|
|
offset, rctx->hash_rem, 0);
|
||
|
|
rctx->buf_count = rctx->hash_rem;
|
||
|
|
} else {
|
||
|
|
rctx->buf_count = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Update result area if supplied */
|
||
|
|
if (req->result)
|
||
|
|
memcpy(req->result, rctx->iv, digest_size);
|
||
|
|
|
||
|
|
e_free:
|
||
|
|
sg_free_table(&rctx->data_sg);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_do_cmac_update(struct ahash_request *req, unsigned int nbytes,
|
||
|
|
unsigned int final)
|
||
|
|
{
|
||
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
||
|
|
struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
|
||
|
|
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
|
||
|
|
struct scatterlist *sg, *cmac_key_sg = NULL;
|
||
|
|
unsigned int block_size =
|
||
|
|
crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
|
||
|
|
unsigned int need_pad, sg_count;
|
||
|
|
gfp_t gfp;
|
||
|
|
u64 len;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (!ctx->u.aes.key_len)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (nbytes)
|
||
|
|
rctx->null_msg = 0;
|
||
|
|
|
||
|
|
len = (u64)rctx->buf_count + (u64)nbytes;
|
||
|
|
|
||
|
|
if (!final && (len <= block_size)) {
|
||
|
|
scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
|
||
|
|
0, nbytes, 0);
|
||
|
|
rctx->buf_count += nbytes;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
rctx->src = req->src;
|
||
|
|
rctx->nbytes = nbytes;
|
||
|
|
|
||
|
|
rctx->final = final;
|
||
|
|
rctx->hash_rem = final ? 0 : len & (block_size - 1);
|
||
|
|
rctx->hash_cnt = len - rctx->hash_rem;
|
||
|
|
if (!final && !rctx->hash_rem) {
|
||
|
|
/* CCP can't do zero length final, so keep some data around */
|
||
|
|
rctx->hash_cnt -= block_size;
|
||
|
|
rctx->hash_rem = block_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (final && (rctx->null_msg || (len & (block_size - 1))))
|
||
|
|
need_pad = 1;
|
||
|
|
else
|
||
|
|
need_pad = 0;
|
||
|
|
|
||
|
|
sg_init_one(&rctx->iv_sg, rctx->iv, sizeof(rctx->iv));
|
||
|
|
|
||
|
|
/* Build the data scatterlist table - allocate enough entries for all
|
||
|
|
* possible data pieces (buffer, input data, padding)
|
||
|
|
*/
|
||
|
|
sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2;
|
||
|
|
gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
|
||
|
|
GFP_KERNEL : GFP_ATOMIC;
|
||
|
|
ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
sg = NULL;
|
||
|
|
if (rctx->buf_count) {
|
||
|
|
sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
|
||
|
|
sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
|
||
|
|
if (!sg) {
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto e_free;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (nbytes) {
|
||
|
|
sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
|
||
|
|
if (!sg) {
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto e_free;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (need_pad) {
|
||
|
|
int pad_length = block_size - (len & (block_size - 1));
|
||
|
|
|
||
|
|
rctx->hash_cnt += pad_length;
|
||
|
|
|
||
|
|
memset(rctx->pad, 0, sizeof(rctx->pad));
|
||
|
|
rctx->pad[0] = 0x80;
|
||
|
|
sg_init_one(&rctx->pad_sg, rctx->pad, pad_length);
|
||
|
|
sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg);
|
||
|
|
if (!sg) {
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto e_free;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (sg) {
|
||
|
|
sg_mark_end(sg);
|
||
|
|
sg = rctx->data_sg.sgl;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Initialize the K1/K2 scatterlist */
|
||
|
|
if (final)
|
||
|
|
cmac_key_sg = (need_pad) ? &ctx->u.aes.k2_sg
|
||
|
|
: &ctx->u.aes.k1_sg;
|
||
|
|
|
||
|
|
memset(&rctx->cmd, 0, sizeof(rctx->cmd));
|
||
|
|
INIT_LIST_HEAD(&rctx->cmd.entry);
|
||
|
|
rctx->cmd.engine = CCP_ENGINE_AES;
|
||
|
|
rctx->cmd.u.aes.type = ctx->u.aes.type;
|
||
|
|
rctx->cmd.u.aes.mode = ctx->u.aes.mode;
|
||
|
|
rctx->cmd.u.aes.action = CCP_AES_ACTION_ENCRYPT;
|
||
|
|
rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
|
||
|
|
rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
|
||
|
|
rctx->cmd.u.aes.iv = &rctx->iv_sg;
|
||
|
|
rctx->cmd.u.aes.iv_len = AES_BLOCK_SIZE;
|
||
|
|
rctx->cmd.u.aes.src = sg;
|
||
|
|
rctx->cmd.u.aes.src_len = rctx->hash_cnt;
|
||
|
|
rctx->cmd.u.aes.dst = NULL;
|
||
|
|
rctx->cmd.u.aes.cmac_key = cmac_key_sg;
|
||
|
|
rctx->cmd.u.aes.cmac_key_len = ctx->u.aes.kn_len;
|
||
|
|
rctx->cmd.u.aes.cmac_final = final;
|
||
|
|
|
||
|
|
ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
e_free:
|
||
|
|
sg_free_table(&rctx->data_sg);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_init(struct ahash_request *req)
|
||
|
|
{
|
||
|
|
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
|
||
|
|
|
||
|
|
memset(rctx, 0, sizeof(*rctx));
|
||
|
|
|
||
|
|
rctx->null_msg = 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_update(struct ahash_request *req)
|
||
|
|
{
|
||
|
|
return ccp_do_cmac_update(req, req->nbytes, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_final(struct ahash_request *req)
|
||
|
|
{
|
||
|
|
return ccp_do_cmac_update(req, 0, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_finup(struct ahash_request *req)
|
||
|
|
{
|
||
|
|
return ccp_do_cmac_update(req, req->nbytes, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_digest(struct ahash_request *req)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = ccp_aes_cmac_init(req);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return ccp_aes_cmac_finup(req);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_export(struct ahash_request *req, void *out)
|
||
|
|
{
|
||
|
|
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
|
||
|
|
struct ccp_aes_cmac_exp_ctx state;
|
||
|
|
|
||
|
|
/* Don't let anything leak to 'out' */
|
||
|
|
memset(&state, 0, sizeof(state));
|
||
|
|
|
||
|
|
state.null_msg = rctx->null_msg;
|
||
|
|
memcpy(state.iv, rctx->iv, sizeof(state.iv));
|
||
|
|
state.buf_count = rctx->buf_count;
|
||
|
|
memcpy(state.buf, rctx->buf, sizeof(state.buf));
|
||
|
|
|
||
|
|
/* 'out' may not be aligned so memcpy from local variable */
|
||
|
|
memcpy(out, &state, sizeof(state));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_import(struct ahash_request *req, const void *in)
|
||
|
|
{
|
||
|
|
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
|
||
|
|
struct ccp_aes_cmac_exp_ctx state;
|
||
|
|
|
||
|
|
/* 'in' may not be aligned so memcpy to local variable */
|
||
|
|
memcpy(&state, in, sizeof(state));
|
||
|
|
|
||
|
|
memset(rctx, 0, sizeof(*rctx));
|
||
|
|
rctx->null_msg = state.null_msg;
|
||
|
|
memcpy(rctx->iv, state.iv, sizeof(rctx->iv));
|
||
|
|
rctx->buf_count = state.buf_count;
|
||
|
|
memcpy(rctx->buf, state.buf, sizeof(rctx->buf));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_setkey(struct crypto_ahash *tfm, const u8 *key,
|
||
|
|
unsigned int key_len)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
|
||
|
|
struct ccp_crypto_ahash_alg *alg =
|
||
|
|
ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
|
||
|
|
u64 k0_hi, k0_lo, k1_hi, k1_lo, k2_hi, k2_lo;
|
||
|
|
u64 rb_hi = 0x00, rb_lo = 0x87;
|
||
|
|
__be64 *gk;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
switch (key_len) {
|
||
|
|
case AES_KEYSIZE_128:
|
||
|
|
ctx->u.aes.type = CCP_AES_TYPE_128;
|
||
|
|
break;
|
||
|
|
case AES_KEYSIZE_192:
|
||
|
|
ctx->u.aes.type = CCP_AES_TYPE_192;
|
||
|
|
break;
|
||
|
|
case AES_KEYSIZE_256:
|
||
|
|
ctx->u.aes.type = CCP_AES_TYPE_256;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
ctx->u.aes.mode = alg->mode;
|
||
|
|
|
||
|
|
/* Set to zero until complete */
|
||
|
|
ctx->u.aes.key_len = 0;
|
||
|
|
|
||
|
|
/* Set the key for the AES cipher used to generate the keys */
|
||
|
|
ret = crypto_cipher_setkey(ctx->u.aes.tfm_cipher, key, key_len);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* Encrypt a block of zeroes - use key area in context */
|
||
|
|
memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
|
||
|
|
crypto_cipher_encrypt_one(ctx->u.aes.tfm_cipher, ctx->u.aes.key,
|
||
|
|
ctx->u.aes.key);
|
||
|
|
|
||
|
|
/* Generate K1 and K2 */
|
||
|
|
k0_hi = be64_to_cpu(*((__be64 *)ctx->u.aes.key));
|
||
|
|
k0_lo = be64_to_cpu(*((__be64 *)ctx->u.aes.key + 1));
|
||
|
|
|
||
|
|
k1_hi = (k0_hi << 1) | (k0_lo >> 63);
|
||
|
|
k1_lo = k0_lo << 1;
|
||
|
|
if (ctx->u.aes.key[0] & 0x80) {
|
||
|
|
k1_hi ^= rb_hi;
|
||
|
|
k1_lo ^= rb_lo;
|
||
|
|
}
|
||
|
|
gk = (__be64 *)ctx->u.aes.k1;
|
||
|
|
*gk = cpu_to_be64(k1_hi);
|
||
|
|
gk++;
|
||
|
|
*gk = cpu_to_be64(k1_lo);
|
||
|
|
|
||
|
|
k2_hi = (k1_hi << 1) | (k1_lo >> 63);
|
||
|
|
k2_lo = k1_lo << 1;
|
||
|
|
if (ctx->u.aes.k1[0] & 0x80) {
|
||
|
|
k2_hi ^= rb_hi;
|
||
|
|
k2_lo ^= rb_lo;
|
||
|
|
}
|
||
|
|
gk = (__be64 *)ctx->u.aes.k2;
|
||
|
|
*gk = cpu_to_be64(k2_hi);
|
||
|
|
gk++;
|
||
|
|
*gk = cpu_to_be64(k2_lo);
|
||
|
|
|
||
|
|
ctx->u.aes.kn_len = sizeof(ctx->u.aes.k1);
|
||
|
|
sg_init_one(&ctx->u.aes.k1_sg, ctx->u.aes.k1, sizeof(ctx->u.aes.k1));
|
||
|
|
sg_init_one(&ctx->u.aes.k2_sg, ctx->u.aes.k2, sizeof(ctx->u.aes.k2));
|
||
|
|
|
||
|
|
/* Save the supplied key */
|
||
|
|
memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
|
||
|
|
memcpy(ctx->u.aes.key, key, key_len);
|
||
|
|
ctx->u.aes.key_len = key_len;
|
||
|
|
sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cmac_cra_init(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
|
||
|
|
struct crypto_cipher *cipher_tfm;
|
||
|
|
|
||
|
|
ctx->complete = ccp_aes_cmac_complete;
|
||
|
|
ctx->u.aes.key_len = 0;
|
||
|
|
|
||
|
|
crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_aes_cmac_req_ctx));
|
||
|
|
|
||
|
|
cipher_tfm = crypto_alloc_cipher("aes", 0,
|
||
|
|
CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_NEED_FALLBACK);
|
||
|
|
if (IS_ERR(cipher_tfm)) {
|
||
|
|
pr_warn("could not load aes cipher driver\n");
|
||
|
|
return PTR_ERR(cipher_tfm);
|
||
|
|
}
|
||
|
|
ctx->u.aes.tfm_cipher = cipher_tfm;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ccp_aes_cmac_cra_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
if (ctx->u.aes.tfm_cipher)
|
||
|
|
crypto_free_cipher(ctx->u.aes.tfm_cipher);
|
||
|
|
ctx->u.aes.tfm_cipher = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ccp_register_aes_cmac_algs(struct list_head *head)
|
||
|
|
{
|
||
|
|
struct ccp_crypto_ahash_alg *ccp_alg;
|
||
|
|
struct ahash_alg *alg;
|
||
|
|
struct hash_alg_common *halg;
|
||
|
|
struct crypto_alg *base;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
|
||
|
|
if (!ccp_alg)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
INIT_LIST_HEAD(&ccp_alg->entry);
|
||
|
|
ccp_alg->mode = CCP_AES_MODE_CMAC;
|
||
|
|
|
||
|
|
alg = &ccp_alg->alg;
|
||
|
|
alg->init = ccp_aes_cmac_init;
|
||
|
|
alg->update = ccp_aes_cmac_update;
|
||
|
|
alg->final = ccp_aes_cmac_final;
|
||
|
|
alg->finup = ccp_aes_cmac_finup;
|
||
|
|
alg->digest = ccp_aes_cmac_digest;
|
||
|
|
alg->export = ccp_aes_cmac_export;
|
||
|
|
alg->import = ccp_aes_cmac_import;
|
||
|
|
alg->setkey = ccp_aes_cmac_setkey;
|
||
|
|
|
||
|
|
halg = &alg->halg;
|
||
|
|
halg->digestsize = AES_BLOCK_SIZE;
|
||
|
|
halg->statesize = sizeof(struct ccp_aes_cmac_exp_ctx);
|
||
|
|
|
||
|
|
base = &halg->base;
|
||
|
|
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)");
|
||
|
|
snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "cmac-aes-ccp");
|
||
|
|
base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
||
|
|
CRYPTO_ALG_NEED_FALLBACK;
|
||
|
|
base->cra_blocksize = AES_BLOCK_SIZE;
|
||
|
|
base->cra_ctxsize = sizeof(struct ccp_ctx);
|
||
|
|
base->cra_priority = CCP_CRA_PRIORITY;
|
||
|
|
base->cra_type = &crypto_ahash_type;
|
||
|
|
base->cra_init = ccp_aes_cmac_cra_init;
|
||
|
|
base->cra_exit = ccp_aes_cmac_cra_exit;
|
||
|
|
base->cra_module = THIS_MODULE;
|
||
|
|
|
||
|
|
ret = crypto_register_ahash(alg);
|
||
|
|
if (ret) {
|
||
|
|
pr_err("%s ahash algorithm registration error (%d)\n",
|
||
|
|
base->cra_name, ret);
|
||
|
|
kfree(ccp_alg);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add(&ccp_alg->entry, head);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|