1/* 2 * Cryptographic API. 3 * 4 * Digest operations. 5 * 6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 * 13 */ 14//#include <linux/crypto.h> 15#include "rtl_crypto.h" 16#include <linux/mm.h> 17#include <linux/errno.h> 18#include <linux/highmem.h> 19#include <asm/scatterlist.h> 20#include "internal.h" 21 22static void init(struct crypto_tfm *tfm) 23{ 24 tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm)); 25} 26 27static void update(struct crypto_tfm *tfm, 28 struct scatterlist *sg, unsigned int nsg) 29{ 30 unsigned int i; 31 32 for (i = 0; i < nsg; i++) { 33 34 struct page *pg = sg[i].page; 35 unsigned int offset = sg[i].offset; 36 unsigned int l = sg[i].length; 37 38 do { 39 unsigned int bytes_from_page = min(l, ((unsigned int) 40 (PAGE_SIZE)) - 41 offset); 42 char *p = crypto_kmap(pg, 0) + offset; 43 44 tfm->__crt_alg->cra_digest.dia_update 45 (crypto_tfm_ctx(tfm), p, 46 bytes_from_page); 47 crypto_kunmap(p, 0); 48 crypto_yield(tfm); 49 offset = 0; 50 pg++; 51 l -= bytes_from_page; 52 } while (l > 0); 53 } 54} 55 56static void final(struct crypto_tfm *tfm, u8 *out) 57{ 58 tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out); 59} 60 61static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) 62{ 63 u32 flags; 64 if (tfm->__crt_alg->cra_digest.dia_setkey == NULL) 65 return -ENOSYS; 66 return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm), 67 key, keylen, &flags); 68} 69 70static void digest(struct crypto_tfm *tfm, 71 struct scatterlist *sg, unsigned int nsg, u8 *out) 72{ 73 unsigned int i; 74 75 tfm->crt_digest.dit_init(tfm); 76 77 for (i = 0; i < nsg; i++) { 78 char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset; 79 tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm), 80 p, sg[i].length); 81 crypto_kunmap(p, 0); 82 crypto_yield(tfm); 83 } 84 crypto_digest_final(tfm, out); 85} 86 87int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags) 88{ 89 return flags ? -EINVAL : 0; 90} 91 92int crypto_init_digest_ops(struct crypto_tfm *tfm) 93{ 94 struct digest_tfm *ops = &tfm->crt_digest; 95 96 ops->dit_init = init; 97 ops->dit_update = update; 98 ops->dit_final = final; 99 ops->dit_digest = digest; 100 ops->dit_setkey = setkey; 101 102 return crypto_alloc_hmac_block(tfm); 103} 104 105void crypto_exit_digest_ops(struct crypto_tfm *tfm) 106{ 107 crypto_free_hmac_block(tfm); 108} 109