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crypto: chacha20poly1305 - a few cleanups 

- Use sg_init_one() instead of sg_init_table() then sg_set_buf().

- Remove unneeded calls to sg_init_table() prior to scatterwalk_ffwd().

- Simplify initializing the poly tail block.

- Simplify computing padlen.

This doesn't change any actual behavior.

Cc: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-06-02 22:46:34 -07:00 committed by Herbert Xu
parent 314d0f0ea6
commit 76cadf2244
1 changed files with 13 additions and 30 deletions
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43
crypto/chacha20poly1305.c
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@ -139,14 +139,10 @@ static int chacha_decrypt(struct aead_request *req)
chacha_iv(creq->iv, req, 1);
sg_init_table(rctx->src, 2);
src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
dst = src;
if (req->src != req->dst) {
sg_init_table(rctx->dst, 2);
if (req->src != req->dst)
dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
}
skcipher_request_set_callback(&creq->req, rctx->flags,
chacha_decrypt_done, req);
@ -182,15 +178,11 @@ static int poly_tail(struct aead_request *req)
struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
struct poly_req *preq = &rctx->u.poly;
__le64 len;
int err;
sg_init_table(preq->src, 1);
len = cpu_to_le64(rctx->assoclen);
memcpy(&preq->tail.assoclen, &len, sizeof(len));
len = cpu_to_le64(rctx->cryptlen);
memcpy(&preq->tail.cryptlen, &len, sizeof(len));
sg_set_buf(preq->src, &preq->tail, sizeof(preq->tail));
preq->tail.assoclen = cpu_to_le64(rctx->assoclen);
preq->tail.cryptlen = cpu_to_le64(rctx->cryptlen);
sg_init_one(preq->src, &preq->tail, sizeof(preq->tail));
ahash_request_set_callback(&preq->req, rctx->flags,
poly_tail_done, req);
@ -215,13 +207,12 @@ static int poly_cipherpad(struct aead_request *req)
struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
struct poly_req *preq = &rctx->u.poly;
unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
unsigned int padlen;
int err;
padlen = (bs - (rctx->cryptlen % bs)) % bs;
padlen = -rctx->cryptlen % POLY1305_BLOCK_SIZE;
memset(preq->pad, 0, sizeof(preq->pad));
sg_init_table(preq->src, 1);
sg_set_buf(preq->src, &preq->pad, padlen);
sg_init_one(preq->src, preq->pad, padlen);
ahash_request_set_callback(&preq->req, rctx->flags,
poly_cipherpad_done, req);
@ -251,7 +242,6 @@ static int poly_cipher(struct aead_request *req)
if (rctx->cryptlen == req->cryptlen) /* encrypting */
crypt = req->dst;
sg_init_table(rctx->src, 2);
crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen);
ahash_request_set_callback(&preq->req, rctx->flags,
@ -276,13 +266,12 @@ static int poly_adpad(struct aead_request *req)
struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
struct poly_req *preq = &rctx->u.poly;
unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
unsigned int padlen;
int err;
padlen = (bs - (rctx->assoclen % bs)) % bs;
padlen = -rctx->assoclen % POLY1305_BLOCK_SIZE;
memset(preq->pad, 0, sizeof(preq->pad));
sg_init_table(preq->src, 1);
sg_set_buf(preq->src, preq->pad, padlen);
sg_init_one(preq->src, preq->pad, padlen);
ahash_request_set_callback(&preq->req, rctx->flags,
poly_adpad_done, req);
@ -332,8 +321,7 @@ static int poly_setkey(struct aead_request *req)
struct poly_req *preq = &rctx->u.poly;
int err;
sg_init_table(preq->src, 1);
sg_set_buf(preq->src, rctx->key, sizeof(rctx->key));
sg_init_one(preq->src, rctx->key, sizeof(rctx->key));
ahash_request_set_callback(&preq->req, rctx->flags,
poly_setkey_done, req);
@ -391,9 +379,8 @@ static int poly_genkey(struct aead_request *req)
rctx->assoclen -= 8;
}
sg_init_table(creq->src, 1);
memset(rctx->key, 0, sizeof(rctx->key));
sg_set_buf(creq->src, rctx->key, sizeof(rctx->key));
sg_init_one(creq->src, rctx->key, sizeof(rctx->key));
chacha_iv(creq->iv, req, 0);
@ -428,14 +415,10 @@ static int chacha_encrypt(struct aead_request *req)
chacha_iv(creq->iv, req, 1);
sg_init_table(rctx->src, 2);
src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
dst = src;
if (req->src != req->dst) {
sg_init_table(rctx->dst, 2);
if (req->src != req->dst)
dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
}
skcipher_request_set_callback(&creq->req, rctx->flags,
chacha_encrypt_done, req);