diff options
| -rw-r--r-- | crypto/authenc.c | 136 |
1 files changed, 114 insertions, 22 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c index 2d609b72f5be..ed8ac5a6fa5f 100644 --- a/crypto/authenc.c +++ b/crypto/authenc.c @@ -10,6 +10,7 @@ * */ +#include <crypto/aead.h> #include <crypto/internal/skcipher.h> #include <crypto/authenc.h> #include <crypto/scatterwalk.h> @@ -87,6 +88,20 @@ badkey: goto out; } +static void authenc_chain(struct scatterlist *head, struct scatterlist *sg, + int chain) +{ + if (chain) { + head->length += sg->length; + sg = scatterwalk_sg_next(sg); + } + + if (sg) + scatterwalk_sg_chain(head, 2, sg); + else + sg_mark_end(head); +} + static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags, struct scatterlist *cipher, unsigned int cryptlen) @@ -127,18 +142,31 @@ auth_unlock: return hash; } -static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags) +static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, + unsigned int flags) { struct crypto_aead *authenc = crypto_aead_reqtfm(req); struct scatterlist *dst = req->dst; - unsigned int cryptlen = req->cryptlen; + struct scatterlist cipher[2]; + struct page *dstp; + unsigned int ivsize = crypto_aead_ivsize(authenc); + unsigned int cryptlen; + u8 *vdst; u8 *hash; - hash = crypto_authenc_hash(req, flags, dst, cryptlen); + dstp = sg_page(dst); + vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; + + sg_init_table(cipher, 2); + sg_set_buf(cipher, iv, ivsize); + authenc_chain(cipher, dst, vdst == iv + ivsize); + + cryptlen = req->cryptlen + ivsize; + hash = crypto_authenc_hash(req, flags, cipher, cryptlen); if (IS_ERR(hash)) return PTR_ERR(hash); - scatterwalk_map_and_copy(hash, dst, cryptlen, + scatterwalk_map_and_copy(hash, cipher, cryptlen, crypto_aead_authsize(authenc), 1); return 0; } @@ -146,8 +174,16 @@ static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags) static void crypto_authenc_encrypt_done(struct crypto_async_request *req, int err) { - if (!err) - err = crypto_authenc_genicv(req->data, 0); + if (!err) { + struct aead_request *areq = req->data; + struct crypto_aead *authenc = crypto_aead_reqtfm(areq); + struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); + struct ablkcipher_request *abreq = aead_request_ctx(areq); + u8 *iv = (u8 *)(abreq + 1) + + crypto_ablkcipher_reqsize(ctx->enc); + + err = crypto_authenc_genicv(areq, iv, 0); + } aead_request_complete(req->data, err); } @@ -157,45 +193,99 @@ static int crypto_authenc_encrypt(struct aead_request *req) struct crypto_aead *authenc = crypto_aead_reqtfm(req); struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); struct ablkcipher_request *abreq = aead_request_ctx(req); + struct crypto_ablkcipher *enc = ctx->enc; + struct scatterlist *dst = req->dst; + unsigned int cryptlen = req->cryptlen; + u8 *iv = (u8 *)(abreq + 1) + crypto_ablkcipher_reqsize(enc); int err; - ablkcipher_request_set_tfm(abreq, ctx->enc); + ablkcipher_request_set_tfm(abreq, enc); ablkcipher_request_set_callback(abreq, aead_request_flags(req), crypto_authenc_encrypt_done, req); - ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen, - req->iv); + ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); + + memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); err = crypto_ablkcipher_encrypt(abreq); if (err) return err; - return crypto_authenc_genicv(req, CRYPTO_TFM_REQ_MAY_SLEEP); + return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); +} + +static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, + int err) +{ + if (!err) { + struct aead_givcrypt_request *greq = req->data; + + err = crypto_authenc_genicv(&greq->areq, greq->giv, 0); + } + + aead_request_complete(req->data, err); +} + +static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) +{ + struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); + struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); + struct aead_request *areq = &req->areq; + struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); + u8 *iv = req->giv; + int err; + + skcipher_givcrypt_set_tfm(greq, ctx->enc); + skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), + crypto_authenc_givencrypt_done, areq); + skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, + areq->iv); + skcipher_givcrypt_set_giv(greq, iv, req->seq); + + err = crypto_skcipher_givencrypt(greq); + if (err) + return err; + + return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); } static int crypto_authenc_verify(struct aead_request *req, + struct scatterlist *cipher, unsigned int cryptlen) { struct crypto_aead *authenc = crypto_aead_reqtfm(req); u8 *ohash; u8 *ihash; - struct scatterlist *src = req->src; unsigned int authsize; - ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, src, + ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher, cryptlen); if (IS_ERR(ohash)) return PTR_ERR(ohash); authsize = crypto_aead_authsize(authenc); ihash = ohash + authsize; - scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0); + scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0); return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0; } -static void crypto_authenc_decrypt_done(struct crypto_async_request *req, - int err) +static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, + unsigned int cryptlen) { - aead_request_complete(req->data, err); + struct crypto_aead *authenc = crypto_aead_reqtfm(req); + struct scatterlist *src = req->src; + struct scatterlist cipher[2]; + struct page *srcp; + unsigned int ivsize = crypto_aead_ivsize(authenc); + u8 *vsrc; + + srcp = sg_page(src); + vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; + + sg_init_table(cipher, 2); + sg_set_buf(cipher, iv, ivsize); + authenc_chain(cipher, src, vsrc == iv + ivsize); + + return crypto_authenc_verify(req, cipher, cryptlen + ivsize); } static int crypto_authenc_decrypt(struct aead_request *req) @@ -205,21 +295,21 @@ static int crypto_authenc_decrypt(struct aead_request *req) struct ablkcipher_request *abreq = aead_request_ctx(req); unsigned int cryptlen = req->cryptlen; unsigned int authsize = crypto_aead_authsize(authenc); + u8 *iv = req->iv; int err; if (cryptlen < authsize) return -EINVAL; cryptlen -= authsize; - err = crypto_authenc_verify(req, cryptlen); + err = crypto_authenc_iverify(req, iv, cryptlen); if (err) return err; ablkcipher_request_set_tfm(abreq, ctx->enc); ablkcipher_request_set_callback(abreq, aead_request_flags(req), - crypto_authenc_decrypt_done, req); - ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, - req->iv); + req->base.complete, req->base.data); + ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); return crypto_ablkcipher_decrypt(abreq); } @@ -248,8 +338,9 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) (crypto_hash_alignmask(auth) & ~(crypto_tfm_ctx_alignment() - 1)) + crypto_hash_digestsize(auth) * 2, - sizeof(struct ablkcipher_request) + - crypto_ablkcipher_reqsize(enc)); + sizeof(struct skcipher_givcrypt_request) + + crypto_ablkcipher_reqsize(enc) + + crypto_ablkcipher_ivsize(enc)); spin_lock_init(&ctx->auth_lock); @@ -347,6 +438,7 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) inst->alg.cra_aead.setkey = crypto_authenc_setkey; inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; + inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; out: crypto_mod_put(auth); |