/* * Cryptographic API. * * Digest operations. * * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <linux/crypto.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/highmem.h> #include <asm/scatterlist.h> #include "internal.h" static void init(struct crypto_tfm *tfm) { tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm)); } static void update(struct crypto_tfm *tfm, struct scatterlist *sg, unsigned int nsg) { unsigned int i; for (i = 0; i < nsg; i++) { struct page *pg = sg[i].page; unsigned int offset = sg[i].offset; unsigned int l = sg[i].length; do { unsigned int bytes_from_page = min(l, ((unsigned int) (PAGE_SIZE)) - offset); char *p = crypto_kmap(pg, 0) + offset; tfm->__crt_alg->cra_digest.dia_update (crypto_tfm_ctx(tfm), p, bytes_from_page); crypto_kunmap(p, 0); crypto_yield(tfm); offset = 0; pg++; l -= bytes_from_page; } while (l > 0); } } static void final(struct crypto_tfm *tfm, u8 *out) { tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out); } static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { u32 flags; if (tfm->__crt_alg->cra_digest.dia_setkey == NULL) return -ENOSYS; return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm), key, keylen, &flags); } static void digest(struct crypto_tfm *tfm, struct scatterlist *sg, unsigned int nsg, u8 *out) { unsigned int i; tfm->crt_digest.dit_init(tfm); for (i = 0; i < nsg; i++) { char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset; tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm), p, sg[i].length); crypto_kunmap(p, 0); crypto_yield(tfm); } crypto_digest_final(tfm, out); } int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags) { return flags ? -EINVAL : 0; } int crypto_init_digest_ops(struct crypto_tfm *tfm) { struct digest_tfm *ops = &tfm->crt_digest; ops->dit_init = init; ops->dit_update = update; ops->dit_final = final; ops->dit_digest = digest; ops->dit_setkey = setkey; return crypto_alloc_hmac_block(tfm); } void crypto_exit_digest_ops(struct crypto_tfm *tfm) { crypto_free_hmac_block(tfm); }