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crypto/842.c
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// 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 <rcj@linux.vnet.ibm.com> * Seth Jennings <sjenning@linux.vnet.ibm.com> |
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* |
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* Rewrite: Dan Streetman <ddstreet@ieee.org> * * This is the software implementation of compression and decompression using * the 842 format. This uses the software 842 library at lib/842/ which is * only a reference implementation, and is very, very slow as compared to other * software compressors. You probably do not want to use this software * compression. If you have access to the PowerPC 842 compression hardware, you * want to use the 842 hardware compression interface, which is at: * drivers/crypto/nx/nx-842-crypto.c |
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*/ #include <linux/init.h> #include <linux/module.h> #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) { void *ctx; ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL); if (!ctx) return ERR_PTR(-ENOMEM); return ctx; } static int crypto842_init(struct crypto_tfm *tfm) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); ctx->wmem = crypto842_alloc_ctx(NULL); if (IS_ERR(ctx->wmem)) return -ENOMEM; return 0; } static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx) { kfree(ctx); } static void crypto842_exit(struct crypto_tfm *tfm) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); crypto842_free_ctx(NULL, ctx->wmem); } |
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static int crypto842_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, 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, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { return sw842_compress(src, slen, dst, dlen, ctx); } |
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static int crypto842_decompress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, 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, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { return sw842_decompress(src, slen, dst, dlen); } |
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static struct crypto_alg alg = { .cra_name = "842", |
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.cra_driver_name = "842-generic", .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, .cra_exit = crypto842_exit, |
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.cra_u = { .compress = { |
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.coa_compress = crypto842_compress, .coa_decompress = crypto842_decompress } } |
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}; |
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static struct scomp_alg scomp = { .alloc_ctx = crypto842_alloc_ctx, .free_ctx = crypto842_free_ctx, .compress = crypto842_scompress, .decompress = crypto842_sdecompress, .base = { .cra_name = "842", .cra_driver_name = "842-scomp", .cra_priority = 100, .cra_module = THIS_MODULE, } }; |
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static int __init crypto842_mod_init(void) |
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{ |
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int ret; ret = crypto_register_alg(&alg); if (ret) return ret; ret = crypto_register_scomp(&scomp); if (ret) { crypto_unregister_alg(&alg); return ret; } 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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{ 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"); MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); |