linux-imx
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committed 752ade68cbdx
/* * Cryptographic API. * * 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. * * 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 for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */struct lzo_ctx { void *lzo_comp_mem;};static void *lzo_alloc_ctx(struct crypto_scomp *tfm){ void *ctx; ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL); if (!ctx) return ERR_PTR(-ENOMEM); return ctx;}static int lzo_init(struct crypto_tfm *tfm){ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); ctx->lzo_comp_mem = lzo_alloc_ctx(NULL); if (IS_ERR(ctx->lzo_comp_mem)) return -ENOMEM; return 0;}static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx){ kvfree(ctx);}static void lzo_exit(struct crypto_tfm *tfm){ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); lzo_free_ctx(NULL, ctx->lzo_comp_mem);}static int __lzo_compress(const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx){ size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ int err; err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx); if (err != LZO_E_OK) return -EINVAL; *dlen = tmp_len; return 0;}static int lzo_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen){ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);}static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx){ return __lzo_compress(src, slen, dst, dlen, ctx);