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author | Herbert Xu <herbert@gondor.apana.org.au> | 2023-09-14 16:28:28 +0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-09-20 13:15:29 +0800 |
commit | 705b52fef3c73655701d9c8868e744f1fa03e942 (patch) | |
tree | 25b4dd05122c06830b702c261358cfe28917b035 | |
parent | 32a8dc4afcfb098ef4e8b465c90db17d22d90107 (diff) | |
download | linux-705b52fef3c73655701d9c8868e744f1fa03e942.tar.gz linux-705b52fef3c73655701d9c8868e744f1fa03e942.tar.bz2 linux-705b52fef3c73655701d9c8868e744f1fa03e942.zip |
crypto: cbc - Convert from skcipher to lskcipher
Replace the existing skcipher CBC template with an lskcipher version.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r-- | crypto/cbc.c | 163 |
1 files changed, 61 insertions, 102 deletions
diff --git a/crypto/cbc.c b/crypto/cbc.c index 6c03e96b945f..28345b8d921c 100644 --- a/crypto/cbc.c +++ b/crypto/cbc.c @@ -5,8 +5,6 @@ * Copyright (c) 2006-2016 Herbert Xu <herbert@gondor.apana.org.au> */ -#include <crypto/algapi.h> -#include <crypto/internal/cipher.h> #include <crypto/internal/skcipher.h> #include <linux/err.h> #include <linux/init.h> @@ -14,99 +12,71 @@ #include <linux/log2.h> #include <linux/module.h> -static int crypto_cbc_encrypt_segment(struct skcipher_walk *walk, - struct crypto_skcipher *skcipher) +static int crypto_cbc_encrypt_segment(struct crypto_lskcipher *tfm, + const u8 *src, u8 *dst, unsigned nbytes, + u8 *iv) { - unsigned int bsize = crypto_skcipher_blocksize(skcipher); - void (*fn)(struct crypto_tfm *, u8 *, const u8 *); - unsigned int nbytes = walk->nbytes; - u8 *src = walk->src.virt.addr; - u8 *dst = walk->dst.virt.addr; - struct crypto_cipher *cipher; - struct crypto_tfm *tfm; - u8 *iv = walk->iv; - - cipher = skcipher_cipher_simple(skcipher); - tfm = crypto_cipher_tfm(cipher); - fn = crypto_cipher_alg(cipher)->cia_encrypt; + unsigned int bsize = crypto_lskcipher_blocksize(tfm); - do { + for (; nbytes >= bsize; src += bsize, dst += bsize, nbytes -= bsize) { crypto_xor(iv, src, bsize); - fn(tfm, dst, iv); + crypto_lskcipher_encrypt(tfm, iv, dst, bsize, NULL); memcpy(iv, dst, bsize); - - src += bsize; - dst += bsize; - } while ((nbytes -= bsize) >= bsize); + } return nbytes; } -static int crypto_cbc_encrypt_inplace(struct skcipher_walk *walk, - struct crypto_skcipher *skcipher) +static int crypto_cbc_encrypt_inplace(struct crypto_lskcipher *tfm, + u8 *src, unsigned nbytes, u8 *oiv) { - unsigned int bsize = crypto_skcipher_blocksize(skcipher); - void (*fn)(struct crypto_tfm *, u8 *, const u8 *); - unsigned int nbytes = walk->nbytes; - u8 *src = walk->src.virt.addr; - struct crypto_cipher *cipher; - struct crypto_tfm *tfm; - u8 *iv = walk->iv; - - cipher = skcipher_cipher_simple(skcipher); - tfm = crypto_cipher_tfm(cipher); - fn = crypto_cipher_alg(cipher)->cia_encrypt; + unsigned int bsize = crypto_lskcipher_blocksize(tfm); + u8 *iv = oiv; + + if (nbytes < bsize) + goto out; do { crypto_xor(src, iv, bsize); - fn(tfm, src, src); + crypto_lskcipher_encrypt(tfm, src, src, bsize, NULL); iv = src; src += bsize; } while ((nbytes -= bsize) >= bsize); - memcpy(walk->iv, iv, bsize); + memcpy(oiv, iv, bsize); +out: return nbytes; } -static int crypto_cbc_encrypt(struct skcipher_request *req) +static int crypto_cbc_encrypt(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned len, u8 *iv, bool final) { - struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); - struct skcipher_walk walk; - int err; + struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); + struct crypto_lskcipher *cipher = *ctx; + int rem; - err = skcipher_walk_virt(&walk, req, false); + if (src == dst) + rem = crypto_cbc_encrypt_inplace(cipher, dst, len, iv); + else + rem = crypto_cbc_encrypt_segment(cipher, src, dst, len, iv); - while (walk.nbytes) { - if (walk.src.virt.addr == walk.dst.virt.addr) - err = crypto_cbc_encrypt_inplace(&walk, skcipher); - else - err = crypto_cbc_encrypt_segment(&walk, skcipher); - err = skcipher_walk_done(&walk, err); - } - - return err; + return rem && final ? -EINVAL : rem; } -static int crypto_cbc_decrypt_segment(struct skcipher_walk *walk, - struct crypto_skcipher *skcipher) +static int crypto_cbc_decrypt_segment(struct crypto_lskcipher *tfm, + const u8 *src, u8 *dst, unsigned nbytes, + u8 *oiv) { - unsigned int bsize = crypto_skcipher_blocksize(skcipher); - void (*fn)(struct crypto_tfm *, u8 *, const u8 *); - unsigned int nbytes = walk->nbytes; - u8 *src = walk->src.virt.addr; - u8 *dst = walk->dst.virt.addr; - struct crypto_cipher *cipher; - struct crypto_tfm *tfm; - u8 *iv = walk->iv; - - cipher = skcipher_cipher_simple(skcipher); - tfm = crypto_cipher_tfm(cipher); - fn = crypto_cipher_alg(cipher)->cia_decrypt; + unsigned int bsize = crypto_lskcipher_blocksize(tfm); + const u8 *iv = oiv; + + if (nbytes < bsize) + goto out; do { - fn(tfm, dst, src); + crypto_lskcipher_decrypt(tfm, src, dst, bsize, NULL); crypto_xor(dst, iv, bsize); iv = src; @@ -114,83 +84,72 @@ static int crypto_cbc_decrypt_segment(struct skcipher_walk *walk, dst += bsize; } while ((nbytes -= bsize) >= bsize); - memcpy(walk->iv, iv, bsize); + memcpy(oiv, iv, bsize); +out: return nbytes; } -static int crypto_cbc_decrypt_inplace(struct skcipher_walk *walk, - struct crypto_skcipher *skcipher) +static int crypto_cbc_decrypt_inplace(struct crypto_lskcipher *tfm, + u8 *src, unsigned nbytes, u8 *iv) { - unsigned int bsize = crypto_skcipher_blocksize(skcipher); - void (*fn)(struct crypto_tfm *, u8 *, const u8 *); - unsigned int nbytes = walk->nbytes; - u8 *src = walk->src.virt.addr; + unsigned int bsize = crypto_lskcipher_blocksize(tfm); u8 last_iv[MAX_CIPHER_BLOCKSIZE]; - struct crypto_cipher *cipher; - struct crypto_tfm *tfm; - cipher = skcipher_cipher_simple(skcipher); - tfm = crypto_cipher_tfm(cipher); - fn = crypto_cipher_alg(cipher)->cia_decrypt; + if (nbytes < bsize) + goto out; /* Start of the last block. */ src += nbytes - (nbytes & (bsize - 1)) - bsize; memcpy(last_iv, src, bsize); for (;;) { - fn(tfm, src, src); + crypto_lskcipher_decrypt(tfm, src, src, bsize, NULL); 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); + crypto_xor(src, iv, bsize); + memcpy(iv, last_iv, bsize); +out: return nbytes; } -static int crypto_cbc_decrypt(struct skcipher_request *req) +static int crypto_cbc_decrypt(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned len, u8 *iv, bool final) { - struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); - struct skcipher_walk walk; - int err; + struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); + struct crypto_lskcipher *cipher = *ctx; + int rem; - err = skcipher_walk_virt(&walk, req, false); + if (src == dst) + rem = crypto_cbc_decrypt_inplace(cipher, dst, len, iv); + else + rem = crypto_cbc_decrypt_segment(cipher, src, dst, len, iv); - while (walk.nbytes) { - if (walk.src.virt.addr == walk.dst.virt.addr) - err = crypto_cbc_decrypt_inplace(&walk, skcipher); - else - err = crypto_cbc_decrypt_segment(&walk, skcipher); - err = skcipher_walk_done(&walk, err); - } - - return err; + return rem && final ? -EINVAL : rem; } static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb) { - struct skcipher_instance *inst; - struct crypto_alg *alg; + struct lskcipher_instance *inst; int err; - inst = skcipher_alloc_instance_simple(tmpl, tb); + inst = lskcipher_alloc_instance_simple(tmpl, tb); if (IS_ERR(inst)) return PTR_ERR(inst); - alg = skcipher_ialg_simple(inst); - err = -EINVAL; - if (!is_power_of_2(alg->cra_blocksize)) + if (!is_power_of_2(inst->alg.co.base.cra_blocksize)) goto out_free_inst; inst->alg.encrypt = crypto_cbc_encrypt; inst->alg.decrypt = crypto_cbc_decrypt; - err = skcipher_register_instance(tmpl, inst); + err = lskcipher_register_instance(tmpl, inst); if (err) { out_free_inst: inst->free(inst); |