chcr: Support for Chelsio's Crypto Hardware
The Chelsio's Crypto Hardware can perform the following operations:
SHA1, SHA224, SHA256, SHA384 and SHA512, HMAC(SHA1), HMAC(SHA224),
HMAC(SHA256), HMAC(SHA384), HAMC(SHA512), AES-128-CBC, AES-192-CBC,
AES-256-CBC, AES-128-XTS, AES-256-XTS
This patch implements the driver for above mentioned features. This
driver is an Upper Layer Driver which is attached to Chelsio's LLD
(cxgb4) and uses the queue allocated by the LLD for sending the crypto
requests to the Hardware and receiving the responses from it.
The crypto operations can be performed by Chelsio's hardware from the
userspace applications and/or from within the kernel space using the
kernel's crypto API.
The above mentioned crypto features have been tested using kernel's
tests mentioned in testmgr.h. They also have been tested from user
space using libkcapi and Openssl.
Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/crypto/chelsio/chcr_algo.h b/drivers/crypto/chelsio/chcr_algo.h
new file mode 100644
index 0000000..ec64fbc
--- /dev/null
+++ b/drivers/crypto/chelsio/chcr_algo.h
@@ -0,0 +1,471 @@
+/*
+ * This file is part of the Chelsio T6 Crypto driver for Linux.
+ *
+ * Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef __CHCR_ALGO_H__
+#define __CHCR_ALGO_H__
+
+/* Crypto key context */
+#define KEY_CONTEXT_CTX_LEN_S 24
+#define KEY_CONTEXT_CTX_LEN_M 0xff
+#define KEY_CONTEXT_CTX_LEN_V(x) ((x) << KEY_CONTEXT_CTX_LEN_S)
+#define KEY_CONTEXT_CTX_LEN_G(x) \
+ (((x) >> KEY_CONTEXT_CTX_LEN_S) & KEY_CONTEXT_CTX_LEN_M)
+
+#define KEY_CONTEXT_DUAL_CK_S 12
+#define KEY_CONTEXT_DUAL_CK_M 0x1
+#define KEY_CONTEXT_DUAL_CK_V(x) ((x) << KEY_CONTEXT_DUAL_CK_S)
+#define KEY_CONTEXT_DUAL_CK_G(x) \
+(((x) >> KEY_CONTEXT_DUAL_CK_S) & KEY_CONTEXT_DUAL_CK_M)
+#define KEY_CONTEXT_DUAL_CK_F KEY_CONTEXT_DUAL_CK_V(1U)
+
+#define KEY_CONTEXT_SALT_PRESENT_S 10
+#define KEY_CONTEXT_SALT_PRESENT_M 0x1
+#define KEY_CONTEXT_SALT_PRESENT_V(x) ((x) << KEY_CONTEXT_SALT_PRESENT_S)
+#define KEY_CONTEXT_SALT_PRESENT_G(x) \
+ (((x) >> KEY_CONTEXT_SALT_PRESENT_S) & \
+ KEY_CONTEXT_SALT_PRESENT_M)
+#define KEY_CONTEXT_SALT_PRESENT_F KEY_CONTEXT_SALT_PRESENT_V(1U)
+
+#define KEY_CONTEXT_VALID_S 0
+#define KEY_CONTEXT_VALID_M 0x1
+#define KEY_CONTEXT_VALID_V(x) ((x) << KEY_CONTEXT_VALID_S)
+#define KEY_CONTEXT_VALID_G(x) \
+ (((x) >> KEY_CONTEXT_VALID_S) & \
+ KEY_CONTEXT_VALID_M)
+#define KEY_CONTEXT_VALID_F KEY_CONTEXT_VALID_V(1U)
+
+#define KEY_CONTEXT_CK_SIZE_S 6
+#define KEY_CONTEXT_CK_SIZE_M 0xf
+#define KEY_CONTEXT_CK_SIZE_V(x) ((x) << KEY_CONTEXT_CK_SIZE_S)
+#define KEY_CONTEXT_CK_SIZE_G(x) \
+ (((x) >> KEY_CONTEXT_CK_SIZE_S) & KEY_CONTEXT_CK_SIZE_M)
+
+#define KEY_CONTEXT_MK_SIZE_S 2
+#define KEY_CONTEXT_MK_SIZE_M 0xf
+#define KEY_CONTEXT_MK_SIZE_V(x) ((x) << KEY_CONTEXT_MK_SIZE_S)
+#define KEY_CONTEXT_MK_SIZE_G(x) \
+ (((x) >> KEY_CONTEXT_MK_SIZE_S) & KEY_CONTEXT_MK_SIZE_M)
+
+#define KEY_CONTEXT_OPAD_PRESENT_S 11
+#define KEY_CONTEXT_OPAD_PRESENT_M 0x1
+#define KEY_CONTEXT_OPAD_PRESENT_V(x) ((x) << KEY_CONTEXT_OPAD_PRESENT_S)
+#define KEY_CONTEXT_OPAD_PRESENT_G(x) \
+ (((x) >> KEY_CONTEXT_OPAD_PRESENT_S) & \
+ KEY_CONTEXT_OPAD_PRESENT_M)
+#define KEY_CONTEXT_OPAD_PRESENT_F KEY_CONTEXT_OPAD_PRESENT_V(1U)
+
+#define CHCR_HASH_MAX_DIGEST_SIZE 64
+#define CHCR_MAX_SHA_DIGEST_SIZE 64
+
+#define IPSEC_TRUNCATED_ICV_SIZE 12
+#define TLS_TRUNCATED_HMAC_SIZE 10
+#define CBCMAC_DIGEST_SIZE 16
+#define MAX_HASH_NAME 20
+
+#define SHA1_INIT_STATE_5X4B 5
+#define SHA256_INIT_STATE_8X4B 8
+#define SHA512_INIT_STATE_8X8B 8
+#define SHA1_INIT_STATE SHA1_INIT_STATE_5X4B
+#define SHA224_INIT_STATE SHA256_INIT_STATE_8X4B
+#define SHA256_INIT_STATE SHA256_INIT_STATE_8X4B
+#define SHA384_INIT_STATE SHA512_INIT_STATE_8X8B
+#define SHA512_INIT_STATE SHA512_INIT_STATE_8X8B
+
+#define DUMMY_BYTES 16
+
+#define IPAD_DATA 0x36363636
+#define OPAD_DATA 0x5c5c5c5c
+
+#define TRANSHDR_SIZE(alignedkctx_len)\
+ (sizeof(struct ulptx_idata) +\
+ sizeof(struct ulp_txpkt) +\
+ sizeof(struct fw_crypto_lookaside_wr) +\
+ sizeof(struct cpl_tx_sec_pdu) +\
+ (alignedkctx_len))
+#define CIPHER_TRANSHDR_SIZE(alignedkctx_len, sge_pairs) \
+ (TRANSHDR_SIZE(alignedkctx_len) + sge_pairs +\
+ sizeof(struct cpl_rx_phys_dsgl))
+#define HASH_TRANSHDR_SIZE(alignedkctx_len)\
+ (TRANSHDR_SIZE(alignedkctx_len) + DUMMY_BYTES)
+
+#define SEC_CPL_OFFSET (sizeof(struct fw_crypto_lookaside_wr) + \
+ sizeof(struct ulp_txpkt) + \
+ sizeof(struct ulptx_idata))
+
+#define FILL_SEC_CPL_OP_IVINSR(id, len, hldr, ofst) \
+ htonl( \
+ CPL_TX_SEC_PDU_OPCODE_V(CPL_TX_SEC_PDU) | \
+ CPL_TX_SEC_PDU_RXCHID_V((id)) | \
+ CPL_TX_SEC_PDU_ACKFOLLOWS_V(0) | \
+ CPL_TX_SEC_PDU_ULPTXLPBK_V(1) | \
+ CPL_TX_SEC_PDU_CPLLEN_V((len)) | \
+ CPL_TX_SEC_PDU_PLACEHOLDER_V((hldr)) | \
+ CPL_TX_SEC_PDU_IVINSRTOFST_V((ofst)))
+
+#define FILL_SEC_CPL_CIPHERSTOP_HI(a_start, a_stop, c_start, c_stop_hi) \
+ htonl( \
+ CPL_TX_SEC_PDU_AADSTART_V((a_start)) | \
+ CPL_TX_SEC_PDU_AADSTOP_V((a_stop)) | \
+ CPL_TX_SEC_PDU_CIPHERSTART_V((c_start)) | \
+ CPL_TX_SEC_PDU_CIPHERSTOP_HI_V((c_stop_hi)))
+
+#define FILL_SEC_CPL_AUTHINSERT(c_stop_lo, a_start, a_stop, a_inst) \
+ htonl( \
+ CPL_TX_SEC_PDU_CIPHERSTOP_LO_V((c_stop_lo)) | \
+ CPL_TX_SEC_PDU_AUTHSTART_V((a_start)) | \
+ CPL_TX_SEC_PDU_AUTHSTOP_V((a_stop)) | \
+ CPL_TX_SEC_PDU_AUTHINSERT_V((a_inst)))
+
+#define FILL_SEC_CPL_SCMD0_SEQNO(ctrl, seq, cmode, amode, opad, size, nivs) \
+ htonl( \
+ SCMD_SEQ_NO_CTRL_V(0) | \
+ SCMD_STATUS_PRESENT_V(0) | \
+ SCMD_PROTO_VERSION_V(CHCR_SCMD_PROTO_VERSION_GENERIC) | \
+ SCMD_ENC_DEC_CTRL_V((ctrl)) | \
+ SCMD_CIPH_AUTH_SEQ_CTRL_V((seq)) | \
+ SCMD_CIPH_MODE_V((cmode)) | \
+ SCMD_AUTH_MODE_V((amode)) | \
+ SCMD_HMAC_CTRL_V((opad)) | \
+ SCMD_IV_SIZE_V((size)) | \
+ SCMD_NUM_IVS_V((nivs)))
+
+#define FILL_SEC_CPL_IVGEN_HDRLEN(last, more, ctx_in, mac, ivdrop, len) htonl( \
+ SCMD_ENB_DBGID_V(0) | \
+ SCMD_IV_GEN_CTRL_V(0) | \
+ SCMD_LAST_FRAG_V((last)) | \
+ SCMD_MORE_FRAGS_V((more)) | \
+ SCMD_TLS_COMPPDU_V(0) | \
+ SCMD_KEY_CTX_INLINE_V((ctx_in)) | \
+ SCMD_TLS_FRAG_ENABLE_V(0) | \
+ SCMD_MAC_ONLY_V((mac)) | \
+ SCMD_AADIVDROP_V((ivdrop)) | \
+ SCMD_HDR_LEN_V((len)))
+
+#define FILL_KEY_CTX_HDR(ck_size, mk_size, d_ck, opad, ctx_len) \
+ htonl(KEY_CONTEXT_VALID_V(1) | \
+ KEY_CONTEXT_CK_SIZE_V((ck_size)) | \
+ KEY_CONTEXT_MK_SIZE_V(mk_size) | \
+ KEY_CONTEXT_DUAL_CK_V((d_ck)) | \
+ KEY_CONTEXT_OPAD_PRESENT_V((opad)) | \
+ KEY_CONTEXT_SALT_PRESENT_V(1) | \
+ KEY_CONTEXT_CTX_LEN_V((ctx_len)))
+
+#define FILL_WR_OP_CCTX_SIZE(len, ctx_len) \
+ htonl( \
+ FW_CRYPTO_LOOKASIDE_WR_OPCODE_V( \
+ FW_CRYPTO_LOOKASIDE_WR) | \
+ FW_CRYPTO_LOOKASIDE_WR_COMPL_V(0) | \
+ FW_CRYPTO_LOOKASIDE_WR_IMM_LEN_V((len)) | \
+ FW_CRYPTO_LOOKASIDE_WR_CCTX_LOC_V(1) | \
+ FW_CRYPTO_LOOKASIDE_WR_CCTX_SIZE_V((ctx_len)))
+
+#define FILL_WR_RX_Q_ID(cid, qid, wr_iv) \
+ htonl( \
+ FW_CRYPTO_LOOKASIDE_WR_RX_CHID_V((cid)) | \
+ FW_CRYPTO_LOOKASIDE_WR_RX_Q_ID_V((qid)) | \
+ FW_CRYPTO_LOOKASIDE_WR_LCB_V(0) | \
+ FW_CRYPTO_LOOKASIDE_WR_IV_V((wr_iv)))
+
+#define FILL_ULPTX_CMD_DEST(cid) \
+ htonl(ULPTX_CMD_V(ULP_TX_PKT) | \
+ ULP_TXPKT_DEST_V(0) | \
+ ULP_TXPKT_DATAMODIFY_V(0) | \
+ ULP_TXPKT_CHANNELID_V((cid)) | \
+ ULP_TXPKT_RO_V(1) | \
+ ULP_TXPKT_FID_V(0))
+
+#define KEYCTX_ALIGN_PAD(bs) ({unsigned int _bs = (bs);\
+ _bs == SHA1_DIGEST_SIZE ? 12 : 0; })
+
+#define FILL_PLD_SIZE_HASH_SIZE(payload_sgl_len, sgl_lengths, total_frags) \
+ htonl(FW_CRYPTO_LOOKASIDE_WR_PLD_SIZE_V(payload_sgl_len ? \
+ sgl_lengths[total_frags] : 0) |\
+ FW_CRYPTO_LOOKASIDE_WR_HASH_SIZE_V(0))
+
+#define FILL_LEN_PKD(calc_tx_flits_ofld, skb) \
+ htonl(FW_CRYPTO_LOOKASIDE_WR_LEN16_V(DIV_ROUND_UP((\
+ calc_tx_flits_ofld(skb) * 8), 16)))
+
+#define FILL_CMD_MORE(immdatalen) htonl(ULPTX_CMD_V(ULP_TX_SC_IMM) |\
+ ULP_TX_SC_MORE_V((immdatalen) ? 0 : 1))
+
+#define MAX_NK 8
+#define CRYPTO_MAX_IMM_TX_PKT_LEN 256
+
+struct algo_param {
+ unsigned int auth_mode;
+ unsigned int mk_size;
+ unsigned int result_size;
+};
+
+struct hash_wr_param {
+ unsigned int opad_needed;
+ unsigned int more;
+ unsigned int last;
+ struct algo_param alg_prm;
+ unsigned int sg_len;
+ unsigned int bfr_len;
+ u64 scmd1;
+};
+
+enum {
+ AES_KEYLENGTH_128BIT = 128,
+ AES_KEYLENGTH_192BIT = 192,
+ AES_KEYLENGTH_256BIT = 256
+};
+
+enum {
+ KEYLENGTH_3BYTES = 3,
+ KEYLENGTH_4BYTES = 4,
+ KEYLENGTH_6BYTES = 6,
+ KEYLENGTH_8BYTES = 8
+};
+
+enum {
+ NUMBER_OF_ROUNDS_10 = 10,
+ NUMBER_OF_ROUNDS_12 = 12,
+ NUMBER_OF_ROUNDS_14 = 14,
+};
+
+/*
+ * CCM defines values of 4, 6, 8, 10, 12, 14, and 16 octets,
+ * where they indicate the size of the integrity check value (ICV)
+ */
+enum {
+ AES_CCM_ICV_4 = 4,
+ AES_CCM_ICV_6 = 6,
+ AES_CCM_ICV_8 = 8,
+ AES_CCM_ICV_10 = 10,
+ AES_CCM_ICV_12 = 12,
+ AES_CCM_ICV_14 = 14,
+ AES_CCM_ICV_16 = 16
+};
+
+struct hash_op_params {
+ unsigned char mk_size;
+ unsigned char pad_align;
+ unsigned char auth_mode;
+ char hash_name[MAX_HASH_NAME];
+ unsigned short block_size;
+ unsigned short word_size;
+ unsigned short ipad_size;
+};
+
+struct phys_sge_pairs {
+ __be16 len[8];
+ __be64 addr[8];
+};
+
+struct phys_sge_parm {
+ unsigned int nents;
+ unsigned int obsize;
+ unsigned short qid;
+ unsigned char align;
+};
+
+struct crypto_result {
+ struct completion completion;
+ int err;
+};
+
+static const u32 sha1_init[SHA1_DIGEST_SIZE / 4] = {
+ SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4,
+};
+
+static const u32 sha224_init[SHA256_DIGEST_SIZE / 4] = {
+ SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
+ SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
+};
+
+static const u32 sha256_init[SHA256_DIGEST_SIZE / 4] = {
+ SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
+ SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
+};
+
+static const u64 sha384_init[SHA512_DIGEST_SIZE / 8] = {
+ SHA384_H0, SHA384_H1, SHA384_H2, SHA384_H3,
+ SHA384_H4, SHA384_H5, SHA384_H6, SHA384_H7,
+};
+
+static const u64 sha512_init[SHA512_DIGEST_SIZE / 8] = {
+ SHA512_H0, SHA512_H1, SHA512_H2, SHA512_H3,
+ SHA512_H4, SHA512_H5, SHA512_H6, SHA512_H7,
+};
+
+static inline void copy_hash_init_values(char *key, int digestsize)
+{
+ u8 i;
+ __be32 *dkey = (__be32 *)key;
+ u64 *ldkey = (u64 *)key;
+ __be64 *sha384 = (__be64 *)sha384_init;
+ __be64 *sha512 = (__be64 *)sha512_init;
+
+ switch (digestsize) {
+ case SHA1_DIGEST_SIZE:
+ for (i = 0; i < SHA1_INIT_STATE; i++)
+ dkey[i] = cpu_to_be32(sha1_init[i]);
+ break;
+ case SHA224_DIGEST_SIZE:
+ for (i = 0; i < SHA224_INIT_STATE; i++)
+ dkey[i] = cpu_to_be32(sha224_init[i]);
+ break;
+ case SHA256_DIGEST_SIZE:
+ for (i = 0; i < SHA256_INIT_STATE; i++)
+ dkey[i] = cpu_to_be32(sha256_init[i]);
+ break;
+ case SHA384_DIGEST_SIZE:
+ for (i = 0; i < SHA384_INIT_STATE; i++)
+ ldkey[i] = be64_to_cpu(sha384[i]);
+ break;
+ case SHA512_DIGEST_SIZE:
+ for (i = 0; i < SHA512_INIT_STATE; i++)
+ ldkey[i] = be64_to_cpu(sha512[i]);
+ break;
+ }
+}
+
+static const u8 sgl_lengths[20] = {
+ 0, 1, 2, 3, 4, 4, 5, 6, 7, 7, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15
+};
+
+/* Number of len fields(8) * size of one addr field */
+#define PHYSDSGL_MAX_LEN_SIZE 16
+
+static inline u16 get_space_for_phys_dsgl(unsigned int sgl_entr)
+{
+ /* len field size + addr field size */
+ return ((sgl_entr >> 3) + ((sgl_entr % 8) ?
+ 1 : 0)) * PHYSDSGL_MAX_LEN_SIZE +
+ (sgl_entr << 3) + ((sgl_entr % 2 ? 1 : 0) << 3);
+}
+
+/* The AES s-transform matrix (s-box). */
+static const u8 aes_sbox[256] = {
+ 99, 124, 119, 123, 242, 107, 111, 197, 48, 1, 103, 43, 254, 215,
+ 171, 118, 202, 130, 201, 125, 250, 89, 71, 240, 173, 212, 162, 175,
+ 156, 164, 114, 192, 183, 253, 147, 38, 54, 63, 247, 204, 52, 165,
+ 229, 241, 113, 216, 49, 21, 4, 199, 35, 195, 24, 150, 5, 154, 7,
+ 18, 128, 226, 235, 39, 178, 117, 9, 131, 44, 26, 27, 110, 90,
+ 160, 82, 59, 214, 179, 41, 227, 47, 132, 83, 209, 0, 237, 32,
+ 252, 177, 91, 106, 203, 190, 57, 74, 76, 88, 207, 208, 239, 170,
+ 251, 67, 77, 51, 133, 69, 249, 2, 127, 80, 60, 159, 168, 81,
+ 163, 64, 143, 146, 157, 56, 245, 188, 182, 218, 33, 16, 255, 243,
+ 210, 205, 12, 19, 236, 95, 151, 68, 23, 196, 167, 126, 61, 100,
+ 93, 25, 115, 96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184,
+ 20, 222, 94, 11, 219, 224, 50, 58, 10, 73, 6, 36, 92, 194,
+ 211, 172, 98, 145, 149, 228, 121, 231, 200, 55, 109, 141, 213, 78,
+ 169, 108, 86, 244, 234, 101, 122, 174, 8, 186, 120, 37, 46, 28, 166,
+ 180, 198, 232, 221, 116, 31, 75, 189, 139, 138, 112, 62, 181, 102,
+ 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158, 225, 248,
+ 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40, 223,
+ 140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84,
+ 187, 22
+};
+
+static u32 aes_ks_subword(const u32 w)
+{
+ u8 bytes[4];
+
+ *(u32 *)(&bytes[0]) = w;
+ bytes[0] = aes_sbox[bytes[0]];
+ bytes[1] = aes_sbox[bytes[1]];
+ bytes[2] = aes_sbox[bytes[2]];
+ bytes[3] = aes_sbox[bytes[3]];
+ return *(u32 *)(&bytes[0]);
+}
+
+static u32 round_constant[11] = {
+ 0x01000000, 0x02000000, 0x04000000, 0x08000000,
+ 0x10000000, 0x20000000, 0x40000000, 0x80000000,
+ 0x1B000000, 0x36000000, 0x6C000000
+};
+
+/* dec_key - OUTPUT - Reverse round key
+ * key - INPUT - key
+ * keylength - INPUT - length of the key in number of bits
+ */
+static inline void get_aes_decrypt_key(unsigned char *dec_key,
+ const unsigned char *key,
+ unsigned int keylength)
+{
+ u32 temp;
+ u32 w_ring[MAX_NK];
+ int i, j, k = 0;
+ u8 nr, nk;
+
+ switch (keylength) {
+ case AES_KEYLENGTH_128BIT:
+ nk = KEYLENGTH_4BYTES;
+ nr = NUMBER_OF_ROUNDS_10;
+ break;
+
+ case AES_KEYLENGTH_192BIT:
+ nk = KEYLENGTH_6BYTES;
+ nr = NUMBER_OF_ROUNDS_12;
+ break;
+ case AES_KEYLENGTH_256BIT:
+ nk = KEYLENGTH_8BYTES;
+ nr = NUMBER_OF_ROUNDS_14;
+ break;
+ default:
+ return;
+ }
+ for (i = 0; i < nk; i++ )
+ w_ring[i] = be32_to_cpu(*(u32 *)&key[4 * i]);
+
+ i = 0;
+ temp = w_ring[nk - 1];
+ while(i + nk < (nr + 1) * 4) {
+ if(!(i % nk)) {
+ /* RotWord(temp) */
+ temp = (temp << 8) | (temp >> 24);
+ temp = aes_ks_subword(temp);
+ temp ^= round_constant[i / nk];
+ }
+ else if (nk == 8 && (i % 4 == 0))
+ temp = aes_ks_subword(temp);
+ w_ring[i % nk] ^= temp;
+ temp = w_ring[i % nk];
+ i++;
+ }
+ for (k = 0, j = i % nk; k < nk; k++) {
+ *((u32 *)dec_key + k) = htonl(w_ring[j]);
+ j--;
+ if(j < 0)
+ j += nk;
+ }
+}
+
+#endif /* __CHCR_ALGO_H__ */