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151 lines
3.7 KiB
151 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Cryptographic API for the 842 software compression algorithm. |
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* |
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* Copyright (C) IBM Corporation, 2011-2015 |
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* |
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* Original Authors: Robert Jennings <[email protected]> |
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* Seth Jennings <[email protected]> |
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* |
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* Rewrite: Dan Streetman <[email protected]> |
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* |
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* This is the software implementation of compression and decompression using |
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* the 842 format. This uses the software 842 library at lib/842/ which is |
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* only a reference implementation, and is very, very slow as compared to other |
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* software compressors. You probably do not want to use this software |
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* compression. If you have access to the PowerPC 842 compression hardware, you |
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* want to use the 842 hardware compression interface, which is at: |
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* drivers/crypto/nx/nx-842-crypto.c |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/crypto.h> |
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#include <linux/sw842.h> |
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#include <crypto/internal/scompress.h> |
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struct crypto842_ctx { |
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void *wmem; /* working memory for compress */ |
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}; |
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static void *crypto842_alloc_ctx(struct crypto_scomp *tfm) |
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{ |
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void *ctx; |
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ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL); |
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if (!ctx) |
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return ERR_PTR(-ENOMEM); |
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return ctx; |
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} |
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static int crypto842_init(struct crypto_tfm *tfm) |
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{ |
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struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); |
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ctx->wmem = crypto842_alloc_ctx(NULL); |
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if (IS_ERR(ctx->wmem)) |
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return -ENOMEM; |
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return 0; |
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} |
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static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx) |
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{ |
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kfree(ctx); |
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} |
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static void crypto842_exit(struct crypto_tfm *tfm) |
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{ |
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struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); |
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crypto842_free_ctx(NULL, ctx->wmem); |
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} |
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static int crypto842_compress(struct crypto_tfm *tfm, |
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const u8 *src, unsigned int slen, |
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u8 *dst, unsigned int *dlen) |
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{ |
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struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); |
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return sw842_compress(src, slen, dst, dlen, ctx->wmem); |
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} |
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static int crypto842_scompress(struct crypto_scomp *tfm, |
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const u8 *src, unsigned int slen, |
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u8 *dst, unsigned int *dlen, void *ctx) |
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{ |
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return sw842_compress(src, slen, dst, dlen, ctx); |
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} |
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static int crypto842_decompress(struct crypto_tfm *tfm, |
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const u8 *src, unsigned int slen, |
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u8 *dst, unsigned int *dlen) |
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{ |
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return sw842_decompress(src, slen, dst, dlen); |
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} |
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static int crypto842_sdecompress(struct crypto_scomp *tfm, |
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const u8 *src, unsigned int slen, |
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u8 *dst, unsigned int *dlen, void *ctx) |
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{ |
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return sw842_decompress(src, slen, dst, dlen); |
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} |
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static struct crypto_alg alg = { |
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.cra_name = "842", |
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.cra_driver_name = "842-generic", |
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.cra_priority = 100, |
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
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.cra_ctxsize = sizeof(struct crypto842_ctx), |
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.cra_module = THIS_MODULE, |
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.cra_init = crypto842_init, |
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.cra_exit = crypto842_exit, |
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.cra_u = { .compress = { |
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.coa_compress = crypto842_compress, |
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.coa_decompress = crypto842_decompress } } |
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}; |
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static struct scomp_alg scomp = { |
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.alloc_ctx = crypto842_alloc_ctx, |
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.free_ctx = crypto842_free_ctx, |
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.compress = crypto842_scompress, |
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.decompress = crypto842_sdecompress, |
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.base = { |
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.cra_name = "842", |
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.cra_driver_name = "842-scomp", |
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.cra_priority = 100, |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static int __init crypto842_mod_init(void) |
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{ |
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int ret; |
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ret = crypto_register_alg(&alg); |
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if (ret) |
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return ret; |
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ret = crypto_register_scomp(&scomp); |
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if (ret) { |
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crypto_unregister_alg(&alg); |
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return ret; |
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} |
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return ret; |
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} |
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subsys_initcall(crypto842_mod_init); |
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static void __exit crypto842_mod_exit(void) |
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{ |
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crypto_unregister_alg(&alg); |
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crypto_unregister_scomp(&scomp); |
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} |
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module_exit(crypto842_mod_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("842 Software Compression Algorithm"); |
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MODULE_ALIAS_CRYPTO("842"); |
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MODULE_ALIAS_CRYPTO("842-generic"); |
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MODULE_AUTHOR("Dan Streetman <[email protected]>");
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