/* * CBC: Cipher Block Chaining mode * * Copyright (c) 2016 Herbert Xu * * 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. * */ #ifndef _CRYPTO_CBC_H #define _CRYPTO_CBC_H #include #include #include static inline int crypto_cbc_encrypt_segment( struct skcipher_walk *walk, struct crypto_skcipher *tfm, void (*fn)(struct crypto_skcipher *, const u8 *, u8 *)) { unsigned int bsize = crypto_skcipher_blocksize(tfm); unsigned int nbytes = walk->nbytes; u8 *src = walk->src.virt.addr; u8 *dst = walk->dst.virt.addr; u8 *iv = walk->iv; do { crypto_xor(iv, src, bsize); fn(tfm, iv, dst); memcpy(iv, dst, bsize); src += bsize; dst += bsize; } while ((nbytes -= bsize) >= bsize); return nbytes; } static inline int crypto_cbc_encrypt_inplace( struct skcipher_walk *walk, struct crypto_skcipher *tfm, void (*fn)(struct crypto_skcipher *, const u8 *, u8 *)) { unsigned int bsize = crypto_skcipher_blocksize(tfm); unsigned int nbytes = walk->nbytes; u8 *src = walk->src.virt.addr; u8 *iv = walk->iv; do { crypto_xor(src, iv, bsize); fn(tfm, src, src); iv = src; src += bsize; } while ((nbytes -= bsize) >= bsize); memcpy(walk->iv, iv, bsize); return nbytes; } static inline int crypto_cbc_encrypt_walk(struct skcipher_request *req, void (*fn)(struct crypto_skcipher *, const u8 *, u8 *)) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct skcipher_walk walk; int err; err = skcipher_walk_virt(&walk, req, false); while (walk.nbytes) { if (walk.src.virt.addr == walk.dst.virt.addr) err = crypto_cbc_encrypt_inplace(&walk, tfm, fn); else err = crypto_cbc_encrypt_segment(&walk, tfm, fn); err = skcipher_walk_done(&walk, err); } return err; } static inline int crypto_cbc_decrypt_segment( struct skcipher_walk *walk, struct crypto_skcipher *tfm, void (*fn)(struct crypto_skcipher *, const u8 *, u8 *)) { unsigned int bsize = crypto_skcipher_blocksize(tfm); unsigned int nbytes = walk->nbytes; u8 *src = walk->src.virt.addr; u8 *dst = walk->dst.virt.addr; u8 *iv = walk->iv; do { fn(tfm, src, dst); crypto_xor(dst, iv, bsize); iv = src; src += bsize; dst += bsize; } while ((nbytes -= bsize) >= bsize); memcpy(walk->iv, iv, bsize); return nbytes; } static inline int crypto_cbc_decrypt_inplace( struct skcipher_walk *walk, struct crypto_skcipher *tfm, void (*fn)(struct crypto_skcipher *, const u8 *, u8 *)) { unsigned int bsize = crypto_skcipher_blocksize(tfm); unsigned int nbytes = walk->nbytes; u8 *src = walk->src.virt.addr; u8 last_iv[bsize]; /* Start of the last block. */ src += nbytes - (nbytes & (bsize - 1)) - bsize; memcpy(last_iv, src, bsize); for (;;) { fn(tfm, src, src); if ((nbytes -= bsize) < bsize) break; crypto_xor(src, src - bsize, bsize); src -= bsize; } crypto_xor(src, walk->iv, bsize); memcpy(walk->iv, last_iv, bsize); return nbytes; } static inline int crypto_cbc_decrypt_blocks( struct skcipher_walk *walk, struct crypto_skcipher *tfm, void (*fn)(struct crypto_skcipher *, const u8 *, u8 *)) { if (walk->src.virt.addr == walk->dst.virt.addr) return crypto_cbc_decrypt_inplace(walk, tfm, fn); 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