linux/drivers/crypto/bcm/spu.c
Thomas Gleixner cb849fc5f0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459
Based on 1 normalized pattern(s):

  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 the gpl 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
  version 2 gplv2 for more details you should have received a copy of
  the gnu general public license version 2 gplv2 along with this
  source code

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 16 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081201.771169395@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:09 +02:00

1238 lines
37 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2016 Broadcom
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include "util.h"
#include "spu.h"
#include "spum.h"
#include "cipher.h"
char *hash_alg_name[] = { "None", "md5", "sha1", "sha224", "sha256", "aes",
"sha384", "sha512", "sha3_224", "sha3_256", "sha3_384", "sha3_512" };
char *aead_alg_name[] = { "ccm(aes)", "gcm(aes)", "authenc" };
/* Assumes SPU-M messages are in big endian */
void spum_dump_msg_hdr(u8 *buf, unsigned int buf_len)
{
u8 *ptr = buf;
struct SPUHEADER *spuh = (struct SPUHEADER *)buf;
unsigned int hash_key_len = 0;
unsigned int hash_state_len = 0;
unsigned int cipher_key_len = 0;
unsigned int iv_len;
u32 pflags;
u32 cflags;
u32 ecf;
u32 cipher_alg;
u32 cipher_mode;
u32 cipher_type;
u32 hash_alg;
u32 hash_mode;
u32 hash_type;
u32 sctx_size; /* SCTX length in words */
u32 sctx_pl_len; /* SCTX payload length in bytes */
packet_log("\n");
packet_log("SPU Message header %p len: %u\n", buf, buf_len);
/* ========== Decode MH ========== */
packet_log(" MH 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
if (spuh->mh.flags & MH_SCTX_PRES)
packet_log(" SCTX present\n");
if (spuh->mh.flags & MH_BDESC_PRES)
packet_log(" BDESC present\n");
if (spuh->mh.flags & MH_MFM_PRES)
packet_log(" MFM present\n");
if (spuh->mh.flags & MH_BD_PRES)
packet_log(" BD present\n");
if (spuh->mh.flags & MH_HASH_PRES)
packet_log(" HASH present\n");
if (spuh->mh.flags & MH_SUPDT_PRES)
packet_log(" SUPDT present\n");
packet_log(" Opcode 0x%02x\n", spuh->mh.op_code);
ptr += sizeof(spuh->mh) + sizeof(spuh->emh); /* skip emh. unused */
/* ========== Decode SCTX ========== */
if (spuh->mh.flags & MH_SCTX_PRES) {
pflags = be32_to_cpu(spuh->sa.proto_flags);
packet_log(" SCTX[0] 0x%08x\n", pflags);
sctx_size = pflags & SCTX_SIZE;
packet_log(" Size %u words\n", sctx_size);
cflags = be32_to_cpu(spuh->sa.cipher_flags);
packet_log(" SCTX[1] 0x%08x\n", cflags);
packet_log(" Inbound:%lu (1:decrypt/vrfy 0:encrypt/auth)\n",
(cflags & CIPHER_INBOUND) >> CIPHER_INBOUND_SHIFT);
packet_log(" Order:%lu (1:AuthFirst 0:EncFirst)\n",
(cflags & CIPHER_ORDER) >> CIPHER_ORDER_SHIFT);
packet_log(" ICV_IS_512:%lx\n",
(cflags & ICV_IS_512) >> ICV_IS_512_SHIFT);
cipher_alg = (cflags & CIPHER_ALG) >> CIPHER_ALG_SHIFT;
cipher_mode = (cflags & CIPHER_MODE) >> CIPHER_MODE_SHIFT;
cipher_type = (cflags & CIPHER_TYPE) >> CIPHER_TYPE_SHIFT;
packet_log(" Crypto Alg:%u Mode:%u Type:%u\n",
cipher_alg, cipher_mode, cipher_type);
hash_alg = (cflags & HASH_ALG) >> HASH_ALG_SHIFT;
hash_mode = (cflags & HASH_MODE) >> HASH_MODE_SHIFT;
hash_type = (cflags & HASH_TYPE) >> HASH_TYPE_SHIFT;
packet_log(" Hash Alg:%x Mode:%x Type:%x\n",
hash_alg, hash_mode, hash_type);
packet_log(" UPDT_Offset:%u\n", cflags & UPDT_OFST);
ecf = be32_to_cpu(spuh->sa.ecf);
packet_log(" SCTX[2] 0x%08x\n", ecf);
packet_log(" WriteICV:%lu CheckICV:%lu ICV_SIZE:%u ",
(ecf & INSERT_ICV) >> INSERT_ICV_SHIFT,
(ecf & CHECK_ICV) >> CHECK_ICV_SHIFT,
(ecf & ICV_SIZE) >> ICV_SIZE_SHIFT);
packet_log("BD_SUPPRESS:%lu\n",
(ecf & BD_SUPPRESS) >> BD_SUPPRESS_SHIFT);
packet_log(" SCTX_IV:%lu ExplicitIV:%lu GenIV:%lu ",
(ecf & SCTX_IV) >> SCTX_IV_SHIFT,
(ecf & EXPLICIT_IV) >> EXPLICIT_IV_SHIFT,
(ecf & GEN_IV) >> GEN_IV_SHIFT);
packet_log("IV_OV_OFST:%lu EXP_IV_SIZE:%u\n",
(ecf & IV_OFFSET) >> IV_OFFSET_SHIFT,
ecf & EXP_IV_SIZE);
ptr += sizeof(struct SCTX);
if (hash_alg && hash_mode) {
char *name = "NONE";
switch (hash_alg) {
case HASH_ALG_MD5:
hash_key_len = 16;
name = "MD5";
break;
case HASH_ALG_SHA1:
hash_key_len = 20;
name = "SHA1";
break;
case HASH_ALG_SHA224:
hash_key_len = 28;
name = "SHA224";
break;
case HASH_ALG_SHA256:
hash_key_len = 32;
name = "SHA256";
break;
case HASH_ALG_SHA384:
hash_key_len = 48;
name = "SHA384";
break;
case HASH_ALG_SHA512:
hash_key_len = 64;
name = "SHA512";
break;
case HASH_ALG_AES:
hash_key_len = 0;
name = "AES";
break;
case HASH_ALG_NONE:
break;
}
packet_log(" Auth Key Type:%s Length:%u Bytes\n",
name, hash_key_len);
packet_dump(" KEY: ", ptr, hash_key_len);
ptr += hash_key_len;
} else if ((hash_alg == HASH_ALG_AES) &&
(hash_mode == HASH_MODE_XCBC)) {
char *name = "NONE";
switch (cipher_type) {
case CIPHER_TYPE_AES128:
hash_key_len = 16;
name = "AES128-XCBC";
break;
case CIPHER_TYPE_AES192:
hash_key_len = 24;
name = "AES192-XCBC";
break;
case CIPHER_TYPE_AES256:
hash_key_len = 32;
name = "AES256-XCBC";
break;
}
packet_log(" Auth Key Type:%s Length:%u Bytes\n",
name, hash_key_len);
packet_dump(" KEY: ", ptr, hash_key_len);
ptr += hash_key_len;
}
if (hash_alg && (hash_mode == HASH_MODE_NONE) &&
(hash_type == HASH_TYPE_UPDT)) {
char *name = "NONE";
switch (hash_alg) {
case HASH_ALG_MD5:
hash_state_len = 16;
name = "MD5";
break;
case HASH_ALG_SHA1:
hash_state_len = 20;
name = "SHA1";
break;
case HASH_ALG_SHA224:
hash_state_len = 32;
name = "SHA224";
break;
case HASH_ALG_SHA256:
hash_state_len = 32;
name = "SHA256";
break;
case HASH_ALG_SHA384:
hash_state_len = 48;
name = "SHA384";
break;
case HASH_ALG_SHA512:
hash_state_len = 64;
name = "SHA512";
break;
case HASH_ALG_AES:
hash_state_len = 0;
name = "AES";
break;
case HASH_ALG_NONE:
break;
}
packet_log(" Auth State Type:%s Length:%u Bytes\n",
name, hash_state_len);
packet_dump(" State: ", ptr, hash_state_len);
ptr += hash_state_len;
}
if (cipher_alg) {
char *name = "NONE";
switch (cipher_alg) {
case CIPHER_ALG_DES:
cipher_key_len = 8;
name = "DES";
break;
case CIPHER_ALG_3DES:
cipher_key_len = 24;
name = "3DES";
break;
case CIPHER_ALG_RC4:
cipher_key_len = 260;
name = "ARC4";
break;
case CIPHER_ALG_AES:
switch (cipher_type) {
case CIPHER_TYPE_AES128:
cipher_key_len = 16;
name = "AES128";
break;
case CIPHER_TYPE_AES192:
cipher_key_len = 24;
name = "AES192";
break;
case CIPHER_TYPE_AES256:
cipher_key_len = 32;
name = "AES256";
break;
}
break;
case CIPHER_ALG_NONE:
break;
}
packet_log(" Cipher Key Type:%s Length:%u Bytes\n",
name, cipher_key_len);
/* XTS has two keys */
if (cipher_mode == CIPHER_MODE_XTS) {
packet_dump(" KEY2: ", ptr, cipher_key_len);
ptr += cipher_key_len;
packet_dump(" KEY1: ", ptr, cipher_key_len);
ptr += cipher_key_len;
cipher_key_len *= 2;
} else {
packet_dump(" KEY: ", ptr, cipher_key_len);
ptr += cipher_key_len;
}
if (ecf & SCTX_IV) {
sctx_pl_len = sctx_size * sizeof(u32) -
sizeof(struct SCTX);
iv_len = sctx_pl_len -
(hash_key_len + hash_state_len +
cipher_key_len);
packet_log(" IV Length:%u Bytes\n", iv_len);
packet_dump(" IV: ", ptr, iv_len);
ptr += iv_len;
}
}
}
/* ========== Decode BDESC ========== */
if (spuh->mh.flags & MH_BDESC_PRES) {
#ifdef DEBUG
struct BDESC_HEADER *bdesc = (struct BDESC_HEADER *)ptr;
#endif
packet_log(" BDESC[0] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
packet_log(" OffsetMAC:%u LengthMAC:%u\n",
be16_to_cpu(bdesc->offset_mac),
be16_to_cpu(bdesc->length_mac));
ptr += sizeof(u32);
packet_log(" BDESC[1] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
packet_log(" OffsetCrypto:%u LengthCrypto:%u\n",
be16_to_cpu(bdesc->offset_crypto),
be16_to_cpu(bdesc->length_crypto));
ptr += sizeof(u32);
packet_log(" BDESC[2] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
packet_log(" OffsetICV:%u OffsetIV:%u\n",
be16_to_cpu(bdesc->offset_icv),
be16_to_cpu(bdesc->offset_iv));
ptr += sizeof(u32);
}
/* ========== Decode BD ========== */
if (spuh->mh.flags & MH_BD_PRES) {
#ifdef DEBUG
struct BD_HEADER *bd = (struct BD_HEADER *)ptr;
#endif
packet_log(" BD[0] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
packet_log(" Size:%ubytes PrevLength:%u\n",
be16_to_cpu(bd->size), be16_to_cpu(bd->prev_length));
ptr += 4;
}
/* Double check sanity */
if (buf + buf_len != ptr) {
packet_log(" Packet parsed incorrectly. ");
packet_log("buf:%p buf_len:%u buf+buf_len:%p ptr:%p\n",
buf, buf_len, buf + buf_len, ptr);
}
packet_log("\n");
}
/**
* spum_ns2_ctx_max_payload() - Determine the max length of the payload for a
* SPU message for a given cipher and hash alg context.
* @cipher_alg: The cipher algorithm
* @cipher_mode: The cipher mode
* @blocksize: The size of a block of data for this algo
*
* The max payload must be a multiple of the blocksize so that if a request is
* too large to fit in a single SPU message, the request can be broken into
* max_payload sized chunks. Each chunk must be a multiple of blocksize.
*
* Return: Max payload length in bytes
*/
u32 spum_ns2_ctx_max_payload(enum spu_cipher_alg cipher_alg,
enum spu_cipher_mode cipher_mode,
unsigned int blocksize)
{
u32 max_payload = SPUM_NS2_MAX_PAYLOAD;
u32 excess;
/* In XTS on SPU-M, we'll need to insert tweak before input data */
if (cipher_mode == CIPHER_MODE_XTS)
max_payload -= SPU_XTS_TWEAK_SIZE;
excess = max_payload % blocksize;
return max_payload - excess;
}
/**
* spum_nsp_ctx_max_payload() - Determine the max length of the payload for a
* SPU message for a given cipher and hash alg context.
* @cipher_alg: The cipher algorithm
* @cipher_mode: The cipher mode
* @blocksize: The size of a block of data for this algo
*
* The max payload must be a multiple of the blocksize so that if a request is
* too large to fit in a single SPU message, the request can be broken into
* max_payload sized chunks. Each chunk must be a multiple of blocksize.
*
* Return: Max payload length in bytes
*/
u32 spum_nsp_ctx_max_payload(enum spu_cipher_alg cipher_alg,
enum spu_cipher_mode cipher_mode,
unsigned int blocksize)
{
u32 max_payload = SPUM_NSP_MAX_PAYLOAD;
u32 excess;
/* In XTS on SPU-M, we'll need to insert tweak before input data */
if (cipher_mode == CIPHER_MODE_XTS)
max_payload -= SPU_XTS_TWEAK_SIZE;
excess = max_payload % blocksize;
return max_payload - excess;
}
/** spum_payload_length() - Given a SPU-M message header, extract the payload
* length.
* @spu_hdr: Start of SPU header
*
* Assumes just MH, EMH, BD (no SCTX, BDESC. Works for response frames.
*
* Return: payload length in bytes
*/
u32 spum_payload_length(u8 *spu_hdr)
{
struct BD_HEADER *bd;
u32 pl_len;
/* Find BD header. skip MH, EMH */
bd = (struct BD_HEADER *)(spu_hdr + 8);
pl_len = be16_to_cpu(bd->size);
return pl_len;
}
/**
* spum_response_hdr_len() - Given the length of the hash key and encryption
* key, determine the expected length of a SPU response header.
* @auth_key_len: authentication key length (bytes)
* @enc_key_len: encryption key length (bytes)
* @is_hash: true if response message is for a hash operation
*
* Return: length of SPU response header (bytes)
*/
u16 spum_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash)
{
if (is_hash)
return SPU_HASH_RESP_HDR_LEN;
else
return SPU_RESP_HDR_LEN;
}
/**
* spum_hash_pad_len() - Calculate the length of hash padding required to extend
* data to a full block size.
* @hash_alg: hash algorithm
* @hash_mode: hash mode
* @chunksize: length of data, in bytes
* @hash_block_size: size of a block of data for hash algorithm
*
* Reserve space for 1 byte (0x80) start of pad and the total length as u64
*
* Return: length of hash pad in bytes
*/
u16 spum_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode,
u32 chunksize, u16 hash_block_size)
{
unsigned int length_len;
unsigned int used_space_last_block;
int hash_pad_len;
/* AES-XCBC hash requires just padding to next block boundary */
if ((hash_alg == HASH_ALG_AES) && (hash_mode == HASH_MODE_XCBC)) {
used_space_last_block = chunksize % hash_block_size;
hash_pad_len = hash_block_size - used_space_last_block;
if (hash_pad_len >= hash_block_size)
hash_pad_len -= hash_block_size;
return hash_pad_len;
}
used_space_last_block = chunksize % hash_block_size + 1;
if ((hash_alg == HASH_ALG_SHA384) || (hash_alg == HASH_ALG_SHA512))
length_len = 2 * sizeof(u64);
else
length_len = sizeof(u64);
used_space_last_block += length_len;
hash_pad_len = hash_block_size - used_space_last_block;
if (hash_pad_len < 0)
hash_pad_len += hash_block_size;
hash_pad_len += 1 + length_len;
return hash_pad_len;
}
/**
* spum_gcm_ccm_pad_len() - Determine the required length of GCM or CCM padding.
* @cipher_mode: Algo type
* @data_size: Length of plaintext (bytes)
*
* @Return: Length of padding, in bytes
*/
u32 spum_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode,
unsigned int data_size)
{
u32 pad_len = 0;
u32 m1 = SPU_GCM_CCM_ALIGN - 1;
if ((cipher_mode == CIPHER_MODE_GCM) ||
(cipher_mode == CIPHER_MODE_CCM))
pad_len = ((data_size + m1) & ~m1) - data_size;
return pad_len;
}
/**
* spum_assoc_resp_len() - Determine the size of the receive buffer required to
* catch associated data.
* @cipher_mode: cipher mode
* @assoc_len: length of associated data (bytes)
* @iv_len: length of IV (bytes)
* @is_encrypt: true if encrypting. false if decrypting.
*
* Return: length of associated data in response message (bytes)
*/
u32 spum_assoc_resp_len(enum spu_cipher_mode cipher_mode,
unsigned int assoc_len, unsigned int iv_len,
bool is_encrypt)
{
u32 buflen = 0;
u32 pad;
if (assoc_len)
buflen = assoc_len;
if (cipher_mode == CIPHER_MODE_GCM) {
/* AAD needs to be padded in responses too */
pad = spum_gcm_ccm_pad_len(cipher_mode, buflen);
buflen += pad;
}
if (cipher_mode == CIPHER_MODE_CCM) {
/*
* AAD needs to be padded in responses too
* for CCM, len + 2 needs to be 128-bit aligned.
*/
pad = spum_gcm_ccm_pad_len(cipher_mode, buflen + 2);
buflen += pad;
}
return buflen;
}
/**
* spu_aead_ivlen() - Calculate the length of the AEAD IV to be included
* in a SPU request after the AAD and before the payload.
* @cipher_mode: cipher mode
* @iv_ctr_len: initialization vector length in bytes
*
* In Linux ~4.2 and later, the assoc_data sg includes the IV. So no need
* to include the IV as a separate field in the SPU request msg.
*
* Return: Length of AEAD IV in bytes
*/
u8 spum_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len)
{
return 0;
}
/**
* spum_hash_type() - Determine the type of hash operation.
* @src_sent: The number of bytes in the current request that have already
* been sent to the SPU to be hashed.
*
* We do not use HASH_TYPE_FULL for requests that fit in a single SPU message.
* Using FULL causes failures (such as when the string to be hashed is empty).
* For similar reasons, we never use HASH_TYPE_FIN. Instead, submit messages
* as INIT or UPDT and do the hash padding in sw.
*/
enum hash_type spum_hash_type(u32 src_sent)
{
return src_sent ? HASH_TYPE_UPDT : HASH_TYPE_INIT;
}
/**
* spum_digest_size() - Determine the size of a hash digest to expect the SPU to
* return.
* alg_digest_size: Number of bytes in the final digest for the given algo
* alg: The hash algorithm
* htype: Type of hash operation (init, update, full, etc)
*
* When doing incremental hashing for an algorithm with a truncated hash
* (e.g., SHA224), the SPU returns the full digest so that it can be fed back as
* a partial result for the next chunk.
*/
u32 spum_digest_size(u32 alg_digest_size, enum hash_alg alg,
enum hash_type htype)
{
u32 digestsize = alg_digest_size;
/* SPU returns complete digest when doing incremental hash and truncated
* hash algo.
*/
if ((htype == HASH_TYPE_INIT) || (htype == HASH_TYPE_UPDT)) {
if (alg == HASH_ALG_SHA224)
digestsize = SHA256_DIGEST_SIZE;
else if (alg == HASH_ALG_SHA384)
digestsize = SHA512_DIGEST_SIZE;
}
return digestsize;
}
/**
* spum_create_request() - Build a SPU request message header, up to and
* including the BD header. Construct the message starting at spu_hdr. Caller
* should allocate this buffer in DMA-able memory at least SPU_HEADER_ALLOC_LEN
* bytes long.
* @spu_hdr: Start of buffer where SPU request header is to be written
* @req_opts: SPU request message options
* @cipher_parms: Parameters related to cipher algorithm
* @hash_parms: Parameters related to hash algorithm
* @aead_parms: Parameters related to AEAD operation
* @data_size: Length of data to be encrypted or authenticated. If AEAD, does
* not include length of AAD.
* Return: the length of the SPU header in bytes. 0 if an error occurs.
*/
u32 spum_create_request(u8 *spu_hdr,
struct spu_request_opts *req_opts,
struct spu_cipher_parms *cipher_parms,
struct spu_hash_parms *hash_parms,
struct spu_aead_parms *aead_parms,
unsigned int data_size)
{
struct SPUHEADER *spuh;
struct BDESC_HEADER *bdesc;
struct BD_HEADER *bd;
u8 *ptr;
u32 protocol_bits = 0;
u32 cipher_bits = 0;
u32 ecf_bits = 0;
u8 sctx_words = 0;
unsigned int buf_len = 0;
/* size of the cipher payload */
unsigned int cipher_len = hash_parms->prebuf_len + data_size +
hash_parms->pad_len;
/* offset of prebuf or data from end of BD header */
unsigned int cipher_offset = aead_parms->assoc_size +
aead_parms->iv_len + aead_parms->aad_pad_len;
/* total size of the DB data (without STAT word padding) */
unsigned int real_db_size = spu_real_db_size(aead_parms->assoc_size,
aead_parms->iv_len,
hash_parms->prebuf_len,
data_size,
aead_parms->aad_pad_len,
aead_parms->data_pad_len,
hash_parms->pad_len);
unsigned int auth_offset = 0;
unsigned int offset_iv = 0;
/* size/offset of the auth payload */
unsigned int auth_len;
auth_len = real_db_size;
if (req_opts->is_aead && req_opts->is_inbound)
cipher_len -= hash_parms->digestsize;
if (req_opts->is_aead && req_opts->is_inbound)
auth_len -= hash_parms->digestsize;
if ((hash_parms->alg == HASH_ALG_AES) &&
(hash_parms->mode == HASH_MODE_XCBC)) {
auth_len -= hash_parms->pad_len;
cipher_len -= hash_parms->pad_len;
}
flow_log("%s()\n", __func__);
flow_log(" in:%u authFirst:%u\n",
req_opts->is_inbound, req_opts->auth_first);
flow_log(" %s. cipher alg:%u mode:%u type %u\n",
spu_alg_name(cipher_parms->alg, cipher_parms->mode),
cipher_parms->alg, cipher_parms->mode, cipher_parms->type);
flow_log(" key: %d\n", cipher_parms->key_len);
flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len);
flow_log(" iv: %d\n", cipher_parms->iv_len);
flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len);
flow_log(" auth alg:%u mode:%u type %u\n",
hash_parms->alg, hash_parms->mode, hash_parms->type);
flow_log(" digestsize: %u\n", hash_parms->digestsize);
flow_log(" authkey: %d\n", hash_parms->key_len);
flow_dump(" authkey: ", hash_parms->key_buf, hash_parms->key_len);
flow_log(" assoc_size:%u\n", aead_parms->assoc_size);
flow_log(" prebuf_len:%u\n", hash_parms->prebuf_len);
flow_log(" data_size:%u\n", data_size);
flow_log(" hash_pad_len:%u\n", hash_parms->pad_len);
flow_log(" real_db_size:%u\n", real_db_size);
flow_log(" auth_offset:%u auth_len:%u cipher_offset:%u cipher_len:%u\n",
auth_offset, auth_len, cipher_offset, cipher_len);
flow_log(" aead_iv: %u\n", aead_parms->iv_len);
/* starting out: zero the header (plus some) */
ptr = spu_hdr;
memset(ptr, 0, sizeof(struct SPUHEADER));
/* format master header word */
/* Do not set the next bit even though the datasheet says to */
spuh = (struct SPUHEADER *)ptr;
ptr += sizeof(struct SPUHEADER);
buf_len += sizeof(struct SPUHEADER);
spuh->mh.op_code = SPU_CRYPTO_OPERATION_GENERIC;
spuh->mh.flags |= (MH_SCTX_PRES | MH_BDESC_PRES | MH_BD_PRES);
/* Format sctx word 0 (protocol_bits) */
sctx_words = 3; /* size in words */
/* Format sctx word 1 (cipher_bits) */
if (req_opts->is_inbound)
cipher_bits |= CIPHER_INBOUND;
if (req_opts->auth_first)
cipher_bits |= CIPHER_ORDER;
/* Set the crypto parameters in the cipher.flags */
cipher_bits |= cipher_parms->alg << CIPHER_ALG_SHIFT;
cipher_bits |= cipher_parms->mode << CIPHER_MODE_SHIFT;
cipher_bits |= cipher_parms->type << CIPHER_TYPE_SHIFT;
/* Set the auth parameters in the cipher.flags */
cipher_bits |= hash_parms->alg << HASH_ALG_SHIFT;
cipher_bits |= hash_parms->mode << HASH_MODE_SHIFT;
cipher_bits |= hash_parms->type << HASH_TYPE_SHIFT;
/*
* Format sctx extensions if required, and update main fields if
* required)
*/
if (hash_parms->alg) {
/* Write the authentication key material if present */
if (hash_parms->key_len) {
memcpy(ptr, hash_parms->key_buf, hash_parms->key_len);
ptr += hash_parms->key_len;
buf_len += hash_parms->key_len;
sctx_words += hash_parms->key_len / 4;
}
if ((cipher_parms->mode == CIPHER_MODE_GCM) ||
(cipher_parms->mode == CIPHER_MODE_CCM))
/* unpadded length */
offset_iv = aead_parms->assoc_size;
/* if GCM/CCM we need to write ICV into the payload */
if (!req_opts->is_inbound) {
if ((cipher_parms->mode == CIPHER_MODE_GCM) ||
(cipher_parms->mode == CIPHER_MODE_CCM))
ecf_bits |= 1 << INSERT_ICV_SHIFT;
} else {
ecf_bits |= CHECK_ICV;
}
/* Inform the SPU of the ICV size (in words) */
if (hash_parms->digestsize == 64)
cipher_bits |= ICV_IS_512;
else
ecf_bits |=
(hash_parms->digestsize / 4) << ICV_SIZE_SHIFT;
}
if (req_opts->bd_suppress)
ecf_bits |= BD_SUPPRESS;
/* copy the encryption keys in the SAD entry */
if (cipher_parms->alg) {
if (cipher_parms->key_len) {
memcpy(ptr, cipher_parms->key_buf,
cipher_parms->key_len);
ptr += cipher_parms->key_len;
buf_len += cipher_parms->key_len;
sctx_words += cipher_parms->key_len / 4;
}
/*
* if encrypting then set IV size, use SCTX IV unless no IV
* given here
*/
if (cipher_parms->iv_buf && cipher_parms->iv_len) {
/* Use SCTX IV */
ecf_bits |= SCTX_IV;
/* cipher iv provided so put it in here */
memcpy(ptr, cipher_parms->iv_buf, cipher_parms->iv_len);
ptr += cipher_parms->iv_len;
buf_len += cipher_parms->iv_len;
sctx_words += cipher_parms->iv_len / 4;
}
}
/*
* RFC4543 (GMAC/ESP) requires data to be sent as part of AAD
* so we need to override the BDESC parameters.
*/
if (req_opts->is_rfc4543) {
if (req_opts->is_inbound)
data_size -= hash_parms->digestsize;
offset_iv = aead_parms->assoc_size + data_size;
cipher_len = 0;
cipher_offset = offset_iv;
auth_len = cipher_offset + aead_parms->data_pad_len;
}
/* write in the total sctx length now that we know it */
protocol_bits |= sctx_words;
/* Endian adjust the SCTX */
spuh->sa.proto_flags = cpu_to_be32(protocol_bits);
spuh->sa.cipher_flags = cpu_to_be32(cipher_bits);
spuh->sa.ecf = cpu_to_be32(ecf_bits);
/* === create the BDESC section === */
bdesc = (struct BDESC_HEADER *)ptr;
bdesc->offset_mac = cpu_to_be16(auth_offset);
bdesc->length_mac = cpu_to_be16(auth_len);
bdesc->offset_crypto = cpu_to_be16(cipher_offset);
bdesc->length_crypto = cpu_to_be16(cipher_len);
/*
* CCM in SPU-M requires that ICV not be in same 32-bit word as data or
* padding. So account for padding as necessary.
*/
if (cipher_parms->mode == CIPHER_MODE_CCM)
auth_len += spum_wordalign_padlen(auth_len);
bdesc->offset_icv = cpu_to_be16(auth_len);
bdesc->offset_iv = cpu_to_be16(offset_iv);
ptr += sizeof(struct BDESC_HEADER);
buf_len += sizeof(struct BDESC_HEADER);
/* === no MFM section === */
/* === create the BD section === */
/* add the BD header */
bd = (struct BD_HEADER *)ptr;
bd->size = cpu_to_be16(real_db_size);
bd->prev_length = 0;
ptr += sizeof(struct BD_HEADER);
buf_len += sizeof(struct BD_HEADER);
packet_dump(" SPU request header: ", spu_hdr, buf_len);
return buf_len;
}
/**
* spum_cipher_req_init() - Build a SPU request message header, up to and
* including the BD header.
* @spu_hdr: Start of SPU request header (MH)
* @cipher_parms: Parameters that describe the cipher request
*
* Construct the message starting at spu_hdr. Caller should allocate this buffer
* in DMA-able memory at least SPU_HEADER_ALLOC_LEN bytes long.
*
* Return: the length of the SPU header in bytes. 0 if an error occurs.
*/
u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
{
struct SPUHEADER *spuh;
u32 protocol_bits = 0;
u32 cipher_bits = 0;
u32 ecf_bits = 0;
u8 sctx_words = 0;
u8 *ptr = spu_hdr;
flow_log("%s()\n", __func__);
flow_log(" cipher alg:%u mode:%u type %u\n", cipher_parms->alg,
cipher_parms->mode, cipher_parms->type);
flow_log(" cipher_iv_len: %u\n", cipher_parms->iv_len);
flow_log(" key: %d\n", cipher_parms->key_len);
flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len);
/* starting out: zero the header (plus some) */
memset(spu_hdr, 0, sizeof(struct SPUHEADER));
ptr += sizeof(struct SPUHEADER);
/* format master header word */
/* Do not set the next bit even though the datasheet says to */
spuh = (struct SPUHEADER *)spu_hdr;
spuh->mh.op_code = SPU_CRYPTO_OPERATION_GENERIC;
spuh->mh.flags |= (MH_SCTX_PRES | MH_BDESC_PRES | MH_BD_PRES);
/* Format sctx word 0 (protocol_bits) */
sctx_words = 3; /* size in words */
/* copy the encryption keys in the SAD entry */
if (cipher_parms->alg) {
if (cipher_parms->key_len) {
ptr += cipher_parms->key_len;
sctx_words += cipher_parms->key_len / 4;
}
/*
* if encrypting then set IV size, use SCTX IV unless no IV
* given here
*/
if (cipher_parms->iv_len) {
/* Use SCTX IV */
ecf_bits |= SCTX_IV;
ptr += cipher_parms->iv_len;
sctx_words += cipher_parms->iv_len / 4;
}
}
/* Set the crypto parameters in the cipher.flags */
cipher_bits |= cipher_parms->alg << CIPHER_ALG_SHIFT;
cipher_bits |= cipher_parms->mode << CIPHER_MODE_SHIFT;
cipher_bits |= cipher_parms->type << CIPHER_TYPE_SHIFT;
/* copy the encryption keys in the SAD entry */
if (cipher_parms->alg && cipher_parms->key_len)
memcpy(spuh + 1, cipher_parms->key_buf, cipher_parms->key_len);
/* write in the total sctx length now that we know it */
protocol_bits |= sctx_words;
/* Endian adjust the SCTX */
spuh->sa.proto_flags = cpu_to_be32(protocol_bits);
/* Endian adjust the SCTX */
spuh->sa.cipher_flags = cpu_to_be32(cipher_bits);
spuh->sa.ecf = cpu_to_be32(ecf_bits);
packet_dump(" SPU request header: ", spu_hdr,
sizeof(struct SPUHEADER));
return sizeof(struct SPUHEADER) + cipher_parms->key_len +
cipher_parms->iv_len + sizeof(struct BDESC_HEADER) +
sizeof(struct BD_HEADER);
}
/**
* spum_cipher_req_finish() - Finish building a SPU request message header for a
* block cipher request. Assumes much of the header was already filled in at
* setkey() time in spu_cipher_req_init().
* @spu_hdr: Start of the request message header (MH field)
* @spu_req_hdr_len: Length in bytes of the SPU request header
* @isInbound: 0 encrypt, 1 decrypt
* @cipher_parms: Parameters describing cipher operation to be performed
* @update_key: If true, rewrite the cipher key in SCTX
* @data_size: Length of the data in the BD field
*
* Assumes much of the header was already filled in at setkey() time in
* spum_cipher_req_init().
* spum_cipher_req_init() fills in the encryption key. For RC4, when submitting
* a request for a non-first chunk, we use the 260-byte SUPDT field from the
* previous response as the key. update_key is true for this case. Unused in all
* other cases.
*/
void spum_cipher_req_finish(u8 *spu_hdr,
u16 spu_req_hdr_len,
unsigned int is_inbound,
struct spu_cipher_parms *cipher_parms,
bool update_key,
unsigned int data_size)
{
struct SPUHEADER *spuh;
struct BDESC_HEADER *bdesc;
struct BD_HEADER *bd;
u8 *bdesc_ptr = spu_hdr + spu_req_hdr_len -
(sizeof(struct BD_HEADER) + sizeof(struct BDESC_HEADER));
u32 cipher_bits;
flow_log("%s()\n", __func__);
flow_log(" in: %u\n", is_inbound);
flow_log(" cipher alg: %u, cipher_type: %u\n", cipher_parms->alg,
cipher_parms->type);
if (update_key) {
flow_log(" cipher key len: %u\n", cipher_parms->key_len);
flow_dump(" key: ", cipher_parms->key_buf,
cipher_parms->key_len);
}
/*
* In XTS mode, API puts "i" parameter (block tweak) in IV. For
* SPU-M, should be in start of the BD; tx_sg_create() copies it there.
* IV in SPU msg for SPU-M should be 0, since that's the "j" parameter
* (block ctr within larger data unit) - given we can send entire disk
* block (<= 4KB) in 1 SPU msg, don't need to use this parameter.
*/
if (cipher_parms->mode == CIPHER_MODE_XTS)
memset(cipher_parms->iv_buf, 0, cipher_parms->iv_len);
flow_log(" iv len: %d\n", cipher_parms->iv_len);
flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len);
flow_log(" data_size: %u\n", data_size);
/* format master header word */
/* Do not set the next bit even though the datasheet says to */
spuh = (struct SPUHEADER *)spu_hdr;
/* cipher_bits was initialized at setkey time */
cipher_bits = be32_to_cpu(spuh->sa.cipher_flags);
/* Format sctx word 1 (cipher_bits) */
if (is_inbound)
cipher_bits |= CIPHER_INBOUND;
else
cipher_bits &= ~CIPHER_INBOUND;
/* update encryption key for RC4 on non-first chunk */
if (update_key) {
spuh->sa.cipher_flags |=
cipher_parms->type << CIPHER_TYPE_SHIFT;
memcpy(spuh + 1, cipher_parms->key_buf, cipher_parms->key_len);
}
if (cipher_parms->alg && cipher_parms->iv_buf && cipher_parms->iv_len)
/* cipher iv provided so put it in here */
memcpy(bdesc_ptr - cipher_parms->iv_len, cipher_parms->iv_buf,
cipher_parms->iv_len);
spuh->sa.cipher_flags = cpu_to_be32(cipher_bits);
/* === create the BDESC section === */
bdesc = (struct BDESC_HEADER *)bdesc_ptr;
bdesc->offset_mac = 0;
bdesc->length_mac = 0;
bdesc->offset_crypto = 0;
/* XTS mode, data_size needs to include tweak parameter */
if (cipher_parms->mode == CIPHER_MODE_XTS)
bdesc->length_crypto = cpu_to_be16(data_size +
SPU_XTS_TWEAK_SIZE);
else
bdesc->length_crypto = cpu_to_be16(data_size);
bdesc->offset_icv = 0;
bdesc->offset_iv = 0;
/* === no MFM section === */
/* === create the BD section === */
/* add the BD header */
bd = (struct BD_HEADER *)(bdesc_ptr + sizeof(struct BDESC_HEADER));
bd->size = cpu_to_be16(data_size);
/* XTS mode, data_size needs to include tweak parameter */
if (cipher_parms->mode == CIPHER_MODE_XTS)
bd->size = cpu_to_be16(data_size + SPU_XTS_TWEAK_SIZE);
else
bd->size = cpu_to_be16(data_size);
bd->prev_length = 0;
packet_dump(" SPU request header: ", spu_hdr, spu_req_hdr_len);
}
/**
* spum_request_pad() - Create pad bytes at the end of the data.
* @pad_start: Start of buffer where pad bytes are to be written
* @gcm_ccm_padding: length of GCM/CCM padding, in bytes
* @hash_pad_len: Number of bytes of padding extend data to full block
* @auth_alg: authentication algorithm
* @auth_mode: authentication mode
* @total_sent: length inserted at end of hash pad
* @status_padding: Number of bytes of padding to align STATUS word
*
* There may be three forms of pad:
* 1. GCM/CCM pad - for GCM/CCM mode ciphers, pad to 16-byte alignment
* 2. hash pad - pad to a block length, with 0x80 data terminator and
* size at the end
* 3. STAT pad - to ensure the STAT field is 4-byte aligned
*/
void spum_request_pad(u8 *pad_start,
u32 gcm_ccm_padding,
u32 hash_pad_len,
enum hash_alg auth_alg,
enum hash_mode auth_mode,
unsigned int total_sent, u32 status_padding)
{
u8 *ptr = pad_start;
/* fix data alignent for GCM/CCM */
if (gcm_ccm_padding > 0) {
flow_log(" GCM: padding to 16 byte alignment: %u bytes\n",
gcm_ccm_padding);
memset(ptr, 0, gcm_ccm_padding);
ptr += gcm_ccm_padding;
}
if (hash_pad_len > 0) {
/* clear the padding section */
memset(ptr, 0, hash_pad_len);
if ((auth_alg == HASH_ALG_AES) &&
(auth_mode == HASH_MODE_XCBC)) {
/* AES/XCBC just requires padding to be 0s */
ptr += hash_pad_len;
} else {
/* terminate the data */
*ptr = 0x80;
ptr += (hash_pad_len - sizeof(u64));
/* add the size at the end as required per alg */
if (auth_alg == HASH_ALG_MD5)
*(u64 *)ptr = cpu_to_le64((u64)total_sent * 8);
else /* SHA1, SHA2-224, SHA2-256 */
*(u64 *)ptr = cpu_to_be64((u64)total_sent * 8);
ptr += sizeof(u64);
}
}
/* pad to a 4byte alignment for STAT */
if (status_padding > 0) {
flow_log(" STAT: padding to 4 byte alignment: %u bytes\n",
status_padding);
memset(ptr, 0, status_padding);
ptr += status_padding;
}
}
/**
* spum_xts_tweak_in_payload() - Indicate that SPUM DOES place the XTS tweak
* field in the packet payload (rather than using IV)
*
* Return: 1
*/
u8 spum_xts_tweak_in_payload(void)
{
return 1;
}
/**
* spum_tx_status_len() - Return the length of the STATUS field in a SPU
* response message.
*
* Return: Length of STATUS field in bytes.
*/
u8 spum_tx_status_len(void)
{
return SPU_TX_STATUS_LEN;
}
/**
* spum_rx_status_len() - Return the length of the STATUS field in a SPU
* response message.
*
* Return: Length of STATUS field in bytes.
*/
u8 spum_rx_status_len(void)
{
return SPU_RX_STATUS_LEN;
}
/**
* spum_status_process() - Process the status from a SPU response message.
* @statp: start of STATUS word
* Return:
* 0 - if status is good and response should be processed
* !0 - status indicates an error and response is invalid
*/
int spum_status_process(u8 *statp)
{
u32 status;
status = __be32_to_cpu(*(__be32 *)statp);
flow_log("SPU response STATUS %#08x\n", status);
if (status & SPU_STATUS_ERROR_FLAG) {
pr_err("%s() Warning: Error result from SPU: %#08x\n",
__func__, status);
if (status & SPU_STATUS_INVALID_ICV)
return SPU_INVALID_ICV;
return -EBADMSG;
}
return 0;
}
/**
* spum_ccm_update_iv() - Update the IV as per the requirements for CCM mode.
*
* @digestsize: Digest size of this request
* @cipher_parms: (pointer to) cipher parmaeters, includes IV buf & IV len
* @assoclen: Length of AAD data
* @chunksize: length of input data to be sent in this req
* @is_encrypt: true if this is an output/encrypt operation
* @is_esp: true if this is an ESP / RFC4309 operation
*
*/
void spum_ccm_update_iv(unsigned int digestsize,
struct spu_cipher_parms *cipher_parms,
unsigned int assoclen,
unsigned int chunksize,
bool is_encrypt,
bool is_esp)
{
u8 L; /* L from CCM algorithm, length of plaintext data */
u8 mprime; /* M' from CCM algo, (M - 2) / 2, where M=authsize */
u8 adata;
if (cipher_parms->iv_len != CCM_AES_IV_SIZE) {
pr_err("%s(): Invalid IV len %d for CCM mode, should be %d\n",
__func__, cipher_parms->iv_len, CCM_AES_IV_SIZE);
return;
}
/*
* IV needs to be formatted as follows:
*
* | Byte 0 | Bytes 1 - N | Bytes (N+1) - 15 |
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Bits 7 - 0 | Bits 7 - 0 |
* | 0 |Ad?|(M - 2) / 2| L - 1 | Nonce | Plaintext Length |
*
* Ad? = 1 if AAD present, 0 if not present
* M = size of auth field, 8, 12, or 16 bytes (SPU-M) -or-
* 4, 6, 8, 10, 12, 14, 16 bytes (SPU2)
* L = Size of Plaintext Length field; Nonce size = 15 - L
*
* It appears that the crypto API already expects the L-1 portion
* to be set in the first byte of the IV, which implicitly determines
* the nonce size, and also fills in the nonce. But the other bits
* in byte 0 as well as the plaintext length need to be filled in.
*
* In rfc4309/esp mode, L is not already in the supplied IV and
* we need to fill it in, as well as move the IV data to be after
* the salt
*/
if (is_esp) {
L = CCM_ESP_L_VALUE; /* RFC4309 has fixed L */
} else {
/* L' = plaintext length - 1 so Plaintext length is L' + 1 */
L = ((cipher_parms->iv_buf[0] & CCM_B0_L_PRIME) >>
CCM_B0_L_PRIME_SHIFT) + 1;
}
mprime = (digestsize - 2) >> 1; /* M' = (M - 2) / 2 */
adata = (assoclen > 0); /* adata = 1 if any associated data */
cipher_parms->iv_buf[0] = (adata << CCM_B0_ADATA_SHIFT) |
(mprime << CCM_B0_M_PRIME_SHIFT) |
((L - 1) << CCM_B0_L_PRIME_SHIFT);
/* Nonce is already filled in by crypto API, and is 15 - L bytes */
/* Don't include digest in plaintext size when decrypting */
if (!is_encrypt)
chunksize -= digestsize;
/* Fill in length of plaintext, formatted to be L bytes long */
format_value_ccm(chunksize, &cipher_parms->iv_buf[15 - L + 1], L);
}
/**
* spum_wordalign_padlen() - Given the length of a data field, determine the
* padding required to align the data following this field on a 4-byte boundary.
* @data_size: length of data field in bytes
*
* Return: length of status field padding, in bytes
*/
u32 spum_wordalign_padlen(u32 data_size)
{
return ((data_size + 3) & ~3) - data_size;
}