622 lines
16 KiB
C
622 lines
16 KiB
C
/*
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* Glue Code for SSE2 assembler versions of Serpent Cipher
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* Glue code based on aesni-intel_glue.c by:
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* Copyright (C) 2008, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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* CTR part based on code (crypto/ctr.c) by:
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*/
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <crypto/ablk_helper.h>
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#include <crypto/algapi.h>
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#include <crypto/serpent.h>
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#include <crypto/cryptd.h>
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#include <crypto/b128ops.h>
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#include <crypto/ctr.h>
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#include <crypto/lrw.h>
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#include <crypto/xts.h>
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#include <asm/crypto/serpent-sse2.h>
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#include <asm/crypto/glue_helper.h>
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static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
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{
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u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
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unsigned int j;
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for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
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ivs[j] = src[j];
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serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
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for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
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u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
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}
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static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
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{
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be128 ctrblk;
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le128_to_be128(&ctrblk, iv);
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le128_inc(iv);
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__serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
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u128_xor(dst, src, (u128 *)&ctrblk);
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}
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static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
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le128 *iv)
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{
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be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
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unsigned int i;
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for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
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if (dst != src)
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dst[i] = src[i];
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le128_to_be128(&ctrblks[i], iv);
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le128_inc(iv);
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}
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serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
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}
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static const struct common_glue_ctx serpent_enc = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_ctr = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
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} }
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};
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static const struct common_glue_ctx serpent_dec = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_dec_cbc = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
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} }
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};
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static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
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}
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static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
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}
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static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
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dst, src, nbytes);
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}
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static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
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nbytes);
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}
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static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
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}
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static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
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{
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return glue_fpu_begin(SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS,
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NULL, fpu_enabled, nbytes);
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}
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static inline void serpent_fpu_end(bool fpu_enabled)
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{
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glue_fpu_end(fpu_enabled);
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}
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struct crypt_priv {
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struct serpent_ctx *ctx;
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bool fpu_enabled;
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};
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static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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{
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const unsigned int bsize = SERPENT_BLOCK_SIZE;
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struct crypt_priv *ctx = priv;
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int i;
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ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
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if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
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serpent_enc_blk_xway(ctx->ctx, srcdst, srcdst);
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return;
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}
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for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
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__serpent_encrypt(ctx->ctx, srcdst, srcdst);
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}
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static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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{
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const unsigned int bsize = SERPENT_BLOCK_SIZE;
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struct crypt_priv *ctx = priv;
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int i;
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ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
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if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
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serpent_dec_blk_xway(ctx->ctx, srcdst, srcdst);
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return;
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}
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for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
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__serpent_decrypt(ctx->ctx, srcdst, srcdst);
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}
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struct serpent_lrw_ctx {
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struct lrw_table_ctx lrw_table;
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struct serpent_ctx serpent_ctx;
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};
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static int lrw_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
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int err;
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err = __serpent_setkey(&ctx->serpent_ctx, key, keylen -
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SERPENT_BLOCK_SIZE);
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if (err)
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return err;
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return lrw_init_table(&ctx->lrw_table, key + keylen -
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SERPENT_BLOCK_SIZE);
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}
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static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->serpent_ctx,
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.fpu_enabled = false,
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};
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struct lrw_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.table_ctx = &ctx->lrw_table,
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = encrypt_callback,
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};
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int ret;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = lrw_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->serpent_ctx,
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.fpu_enabled = false,
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};
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struct lrw_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.table_ctx = &ctx->lrw_table,
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = decrypt_callback,
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};
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int ret;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = lrw_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static void lrw_exit_tfm(struct crypto_tfm *tfm)
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{
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struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
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lrw_free_table(&ctx->lrw_table);
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}
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struct serpent_xts_ctx {
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struct serpent_ctx tweak_ctx;
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struct serpent_ctx crypt_ctx;
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};
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static int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct serpent_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 *flags = &tfm->crt_flags;
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int err;
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/* key consists of keys of equal size concatenated, therefore
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* the length must be even
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*/
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if (keylen % 2) {
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*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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/* first half of xts-key is for crypt */
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err = __serpent_setkey(&ctx->crypt_ctx, key, keylen / 2);
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if (err)
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return err;
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/* second half of xts-key is for tweak */
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return __serpent_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
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}
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static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->crypt_ctx,
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.fpu_enabled = false,
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};
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struct xts_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.tweak_ctx = &ctx->tweak_ctx,
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.tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = encrypt_callback,
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};
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int ret;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = xts_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->crypt_ctx,
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.fpu_enabled = false,
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};
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struct xts_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.tweak_ctx = &ctx->tweak_ctx,
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.tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = decrypt_callback,
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};
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int ret;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = xts_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static struct crypto_alg serpent_algs[10] = { {
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.cra_name = "__ecb-serpent-sse2",
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.cra_driver_name = "__driver-ecb-serpent-sse2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = serpent_setkey,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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},
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},
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}, {
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.cra_name = "__cbc-serpent-sse2",
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.cra_driver_name = "__driver-cbc-serpent-sse2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = serpent_setkey,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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},
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}, {
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.cra_name = "__ctr-serpent-sse2",
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.cra_driver_name = "__driver-ctr-serpent-sse2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = serpent_setkey,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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},
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},
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}, {
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.cra_name = "__lrw-serpent-sse2",
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.cra_driver_name = "__driver-lrw-serpent-sse2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_lrw_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_exit = lrw_exit_tfm,
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE +
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SERPENT_BLOCK_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE +
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SERPENT_BLOCK_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = lrw_serpent_setkey,
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.encrypt = lrw_encrypt,
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.decrypt = lrw_decrypt,
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},
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},
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}, {
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.cra_name = "__xts-serpent-sse2",
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.cra_driver_name = "__driver-xts-serpent-sse2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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|
.cra_ctxsize = sizeof(struct serpent_xts_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE * 2,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE * 2,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = xts_serpent_setkey,
|
|
.encrypt = xts_encrypt,
|
|
.decrypt = xts_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "ecb(serpent)",
|
|
.cra_driver_name = "ecb-serpent-sse2",
|
|
.cra_priority = 400,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = SERPENT_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "cbc(serpent)",
|
|
.cra_driver_name = "cbc-serpent-sse2",
|
|
.cra_priority = 400,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = SERPENT_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = __ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "ctr(serpent)",
|
|
.cra_driver_name = "ctr-serpent-sse2",
|
|
.cra_priority = 400,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_encrypt,
|
|
.geniv = "chainiv",
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "lrw(serpent)",
|
|
.cra_driver_name = "lrw-serpent-sse2",
|
|
.cra_priority = 400,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = SERPENT_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE +
|
|
SERPENT_BLOCK_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE +
|
|
SERPENT_BLOCK_SIZE,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "xts(serpent)",
|
|
.cra_driver_name = "xts-serpent-sse2",
|
|
.cra_priority = 400,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = SERPENT_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE * 2,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE * 2,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
} };
|
|
|
|
static int __init serpent_sse2_init(void)
|
|
{
|
|
if (!cpu_has_xmm2) {
|
|
printk(KERN_INFO "SSE2 instructions are not detected.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return crypto_register_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
|
|
}
|
|
|
|
static void __exit serpent_sse2_exit(void)
|
|
{
|
|
crypto_unregister_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
|
|
}
|
|
|
|
module_init(serpent_sse2_init);
|
|
module_exit(serpent_sse2_exit);
|
|
|
|
MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("serpent");
|