diff options
author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-07-16 06:35:08 +0200 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-07-17 15:20:19 +0200 |
commit | 747909223397e11743c81352b3e4fdd29346bbf9 (patch) | |
tree | b1a309fac0c7fbb69e390b57bb10b5cc18099f1d | |
parent | crypto: rsa - limit supported key lengths (diff) | |
download | linux-747909223397e11743c81352b3e4fdd29346bbf9.tar.xz linux-747909223397e11743c81352b3e4fdd29346bbf9.zip |
crypto: chacha20poly1305 - Convert to new AEAD interface
This patch converts rfc7539 and rfc7539esp to the new AEAD interface.
The test vectors for rfc7539esp have also been updated to include
the IV.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Martin Willi <martin@strongswan.org>
-rw-r--r-- | crypto/chacha20poly1305.c | 213 | ||||
-rw-r--r-- | crypto/testmgr.h | 10 |
2 files changed, 133 insertions, 90 deletions
diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c index 7b46ed799a64..86260937b0f3 100644 --- a/crypto/chacha20poly1305.c +++ b/crypto/chacha20poly1305.c @@ -60,12 +60,16 @@ struct chacha_req { }; struct chachapoly_req_ctx { + struct scatterlist src[2]; + struct scatterlist dst[2]; /* the key we generate for Poly1305 using Chacha20 */ u8 key[POLY1305_KEY_SIZE]; /* calculated Poly1305 tag */ u8 tag[POLY1305_DIGEST_SIZE]; /* length of data to en/decrypt, without ICV */ unsigned int cryptlen; + /* Actual AD, excluding IV */ + unsigned int assoclen; union { struct poly_req poly; struct chacha_req chacha; @@ -98,7 +102,9 @@ static int poly_verify_tag(struct aead_request *req) struct chachapoly_req_ctx *rctx = aead_request_ctx(req); u8 tag[sizeof(rctx->tag)]; - scatterwalk_map_and_copy(tag, req->src, rctx->cryptlen, sizeof(tag), 0); + scatterwalk_map_and_copy(tag, req->src, + req->assoclen + rctx->cryptlen, + sizeof(tag), 0); if (crypto_memneq(tag, rctx->tag, sizeof(tag))) return -EBADMSG; return 0; @@ -108,7 +114,8 @@ static int poly_copy_tag(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); - scatterwalk_map_and_copy(rctx->tag, req->dst, rctx->cryptlen, + scatterwalk_map_and_copy(rctx->tag, req->dst, + req->assoclen + rctx->cryptlen, sizeof(rctx->tag), 1); return 0; } @@ -123,14 +130,24 @@ static int chacha_decrypt(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 chacha_req *creq = &rctx->u.chacha; + struct scatterlist *src, *dst; int err; 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); + dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); + } + ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), chacha_decrypt_done, req); ablkcipher_request_set_tfm(&creq->req, ctx->chacha); - ablkcipher_request_set_crypt(&creq->req, req->src, req->dst, + ablkcipher_request_set_crypt(&creq->req, src, dst, rctx->cryptlen, creq->iv); err = crypto_ablkcipher_decrypt(&creq->req); if (err) @@ -156,14 +173,15 @@ static void poly_tail_done(struct crypto_async_request *areq, int err) static int poly_tail(struct aead_request *req) { - struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); + struct crypto_aead *tfm = crypto_aead_reqtfm(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(req->assoclen); + 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)); @@ -228,6 +246,9 @@ 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, aead_request_flags(req), poly_cipher_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); @@ -253,7 +274,7 @@ static int poly_adpad(struct aead_request *req) unsigned int padlen, bs = POLY1305_BLOCK_SIZE; int err; - padlen = (bs - (req->assoclen % bs)) % bs; + padlen = (bs - (rctx->assoclen % bs)) % bs; memset(preq->pad, 0, sizeof(preq->pad)); sg_init_table(preq->src, 1); sg_set_buf(preq->src, preq->pad, padlen); @@ -285,7 +306,7 @@ static int poly_ad(struct aead_request *req) ahash_request_set_callback(&preq->req, aead_request_flags(req), poly_ad_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); - ahash_request_set_crypt(&preq->req, req->assoc, NULL, req->assoclen); + ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen); err = crypto_ahash_update(&preq->req); if (err) @@ -351,11 +372,20 @@ static void poly_genkey_done(struct crypto_async_request *areq, int err) static int poly_genkey(struct aead_request *req) { - struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); + struct crypto_aead *tfm = crypto_aead_reqtfm(req); + struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct chacha_req *creq = &rctx->u.chacha; int err; + rctx->assoclen = req->assoclen; + + if (crypto_aead_ivsize(tfm) == 8) { + if (rctx->assoclen < 8) + return -EINVAL; + 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)); @@ -385,14 +415,24 @@ static int chacha_encrypt(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 chacha_req *creq = &rctx->u.chacha; + struct scatterlist *src, *dst; int err; 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); + dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); + } + ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), chacha_encrypt_done, req); ablkcipher_request_set_tfm(&creq->req, ctx->chacha); - ablkcipher_request_set_crypt(&creq->req, req->src, req->dst, + ablkcipher_request_set_crypt(&creq->req, src, dst, req->cryptlen, creq->iv); err = crypto_ablkcipher_encrypt(&creq->req); if (err) @@ -426,8 +466,6 @@ static int chachapoly_decrypt(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); - if (req->cryptlen < POLY1305_DIGEST_SIZE) - return -EINVAL; rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE; /* decrypt call chain: @@ -476,11 +514,11 @@ static int chachapoly_setauthsize(struct crypto_aead *tfm, return 0; } -static int chachapoly_init(struct crypto_tfm *tfm) +static int chachapoly_init(struct crypto_aead *tfm) { - struct crypto_instance *inst = (void *)tfm->__crt_alg; - struct chachapoly_instance_ctx *ictx = crypto_instance_ctx(inst); - struct chachapoly_ctx *ctx = crypto_tfm_ctx(tfm); + struct aead_instance *inst = aead_alg_instance(tfm); + struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst); + struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); struct crypto_ablkcipher *chacha; struct crypto_ahash *poly; unsigned long align; @@ -499,77 +537,88 @@ static int chachapoly_init(struct crypto_tfm *tfm) ctx->poly = poly; ctx->saltlen = ictx->saltlen; - align = crypto_tfm_alg_alignmask(tfm); + align = crypto_aead_alignmask(tfm); align &= ~(crypto_tfm_ctx_alignment() - 1); - crypto_aead_set_reqsize(__crypto_aead_cast(tfm), - align + offsetof(struct chachapoly_req_ctx, u) + - max(offsetof(struct chacha_req, req) + - sizeof(struct ablkcipher_request) + - crypto_ablkcipher_reqsize(chacha), - offsetof(struct poly_req, req) + - sizeof(struct ahash_request) + - crypto_ahash_reqsize(poly))); + crypto_aead_set_reqsize( + tfm, + align + offsetof(struct chachapoly_req_ctx, u) + + max(offsetof(struct chacha_req, req) + + sizeof(struct ablkcipher_request) + + crypto_ablkcipher_reqsize(chacha), + offsetof(struct poly_req, req) + + sizeof(struct ahash_request) + + crypto_ahash_reqsize(poly))); return 0; } -static void chachapoly_exit(struct crypto_tfm *tfm) +static void chachapoly_exit(struct crypto_aead *tfm) { - struct chachapoly_ctx *ctx = crypto_tfm_ctx(tfm); + struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); crypto_free_ahash(ctx->poly); crypto_free_ablkcipher(ctx->chacha); } -static struct crypto_instance *chachapoly_alloc(struct rtattr **tb, - const char *name, - unsigned int ivsize) +static void chachapoly_free(struct aead_instance *inst) +{ + struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst); + + crypto_drop_skcipher(&ctx->chacha); + crypto_drop_ahash(&ctx->poly); + kfree(inst); +} + +static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, + const char *name, unsigned int ivsize) { struct crypto_attr_type *algt; - struct crypto_instance *inst; + struct aead_instance *inst; struct crypto_alg *chacha; struct crypto_alg *poly; - struct ahash_alg *poly_ahash; + struct hash_alg_common *poly_hash; struct chachapoly_instance_ctx *ctx; const char *chacha_name, *poly_name; int err; if (ivsize > CHACHAPOLY_IV_SIZE) - return ERR_PTR(-EINVAL); + return -EINVAL; algt = crypto_get_attr_type(tb); if (IS_ERR(algt)) - return ERR_CAST(algt); + return PTR_ERR(algt); - if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) - return ERR_PTR(-EINVAL); + if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_AEAD_NEW)) & + algt->mask) + return -EINVAL; chacha_name = crypto_attr_alg_name(tb[1]); if (IS_ERR(chacha_name)) - return ERR_CAST(chacha_name); + return PTR_ERR(chacha_name); poly_name = crypto_attr_alg_name(tb[2]); if (IS_ERR(poly_name)) - return ERR_CAST(poly_name); + return PTR_ERR(poly_name); poly = crypto_find_alg(poly_name, &crypto_ahash_type, CRYPTO_ALG_TYPE_HASH, CRYPTO_ALG_TYPE_AHASH_MASK); if (IS_ERR(poly)) - return ERR_CAST(poly); + return PTR_ERR(poly); err = -ENOMEM; inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) goto out_put_poly; - ctx = crypto_instance_ctx(inst); + ctx = aead_instance_ctx(inst); ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; - poly_ahash = container_of(poly, struct ahash_alg, halg.base); - err = crypto_init_ahash_spawn(&ctx->poly, &poly_ahash->halg, inst); + poly_hash = __crypto_hash_alg_common(poly); + err = crypto_init_ahash_spawn(&ctx->poly, poly_hash, + aead_crypto_instance(inst)); if (err) goto err_free_inst; - crypto_set_skcipher_spawn(&ctx->chacha, inst); + crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst)); err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0, crypto_requires_sync(algt->type, algt->mask)); @@ -587,37 +636,43 @@ static struct crypto_instance *chachapoly_alloc(struct rtattr **tb, goto out_drop_chacha; err = -ENAMETOOLONG; - if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, + if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s,%s)", name, chacha_name, poly_name) >= CRYPTO_MAX_ALG_NAME) goto out_drop_chacha; - if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, + if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s,%s)", name, chacha->cra_driver_name, poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto out_drop_chacha; - inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; - inst->alg.cra_flags |= (chacha->cra_flags | - poly->cra_flags) & CRYPTO_ALG_ASYNC; - inst->alg.cra_priority = (chacha->cra_priority + - poly->cra_priority) / 2; - inst->alg.cra_blocksize = 1; - inst->alg.cra_alignmask = chacha->cra_alignmask | poly->cra_alignmask; - inst->alg.cra_type = &crypto_nivaead_type; - inst->alg.cra_aead.ivsize = ivsize; - inst->alg.cra_aead.maxauthsize = POLY1305_DIGEST_SIZE; - inst->alg.cra_ctxsize = sizeof(struct chachapoly_ctx) + ctx->saltlen; - inst->alg.cra_init = chachapoly_init; - inst->alg.cra_exit = chachapoly_exit; - inst->alg.cra_aead.encrypt = chachapoly_encrypt; - inst->alg.cra_aead.decrypt = chachapoly_decrypt; - inst->alg.cra_aead.setkey = chachapoly_setkey; - inst->alg.cra_aead.setauthsize = chachapoly_setauthsize; - inst->alg.cra_aead.geniv = "seqiv"; - -out: + inst->alg.base.cra_flags = (chacha->cra_flags | poly->cra_flags) & + CRYPTO_ALG_ASYNC; + inst->alg.base.cra_flags |= CRYPTO_ALG_AEAD_NEW; + inst->alg.base.cra_priority = (chacha->cra_priority + + poly->cra_priority) / 2; + inst->alg.base.cra_blocksize = 1; + inst->alg.base.cra_alignmask = chacha->cra_alignmask | + poly->cra_alignmask; + inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) + + ctx->saltlen; + inst->alg.ivsize = ivsize; + inst->alg.maxauthsize = POLY1305_DIGEST_SIZE; + inst->alg.init = chachapoly_init; + inst->alg.exit = chachapoly_exit; + inst->alg.encrypt = chachapoly_encrypt; + inst->alg.decrypt = chachapoly_decrypt; + inst->alg.setkey = chachapoly_setkey; + inst->alg.setauthsize = chachapoly_setauthsize; + + inst->free = chachapoly_free; + + err = aead_register_instance(tmpl, inst); + if (err) + goto out_drop_chacha; + +out_put_poly: crypto_mod_put(poly); - return inst; + return err; out_drop_chacha: crypto_drop_skcipher(&ctx->chacha); @@ -625,41 +680,28 @@ err_drop_poly: crypto_drop_ahash(&ctx->poly); err_free_inst: kfree(inst); -out_put_poly: - inst = ERR_PTR(err); - goto out; -} - -static struct crypto_instance *rfc7539_alloc(struct rtattr **tb) -{ - return chachapoly_alloc(tb, "rfc7539", 12); + goto out_put_poly; } -static struct crypto_instance *rfc7539esp_alloc(struct rtattr **tb) +static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb) { - return chachapoly_alloc(tb, "rfc7539esp", 8); + return chachapoly_create(tmpl, tb, "rfc7539", 12); } -static void chachapoly_free(struct crypto_instance *inst) +static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb) { - struct chachapoly_instance_ctx *ctx = crypto_instance_ctx(inst); - - crypto_drop_skcipher(&ctx->chacha); - crypto_drop_ahash(&ctx->poly); - kfree(inst); + return chachapoly_create(tmpl, tb, "rfc7539esp", 8); } static struct crypto_template rfc7539_tmpl = { .name = "rfc7539", - .alloc = rfc7539_alloc, - .free = chachapoly_free, + .create = rfc7539_create, .module = THIS_MODULE, }; static struct crypto_template rfc7539esp_tmpl = { .name = "rfc7539esp", - .alloc = rfc7539esp_alloc, - .free = chachapoly_free, + .create = rfc7539esp_create, .module = THIS_MODULE, }; @@ -690,6 +732,5 @@ module_exit(chacha20poly1305_module_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD"); -MODULE_ALIAS_CRYPTO("chacha20poly1305"); MODULE_ALIAS_CRYPTO("rfc7539"); MODULE_ALIAS_CRYPTO("rfc7539esp"); diff --git a/crypto/testmgr.h b/crypto/testmgr.h index 3dc1c9537ec0..1ae7acd9d210 100644 --- a/crypto/testmgr.h +++ b/crypto/testmgr.h @@ -23577,8 +23577,9 @@ static struct aead_testvec rfc7539esp_enc_tv_template[] = { .klen = 36, .iv = "\x01\x02\x03\x04\x05\x06\x07\x08", .assoc = "\xf3\x33\x88\x86\x00\x00\x00\x00" - "\x00\x00\x4e\x91", - .alen = 12, + "\x00\x00\x4e\x91\x01\x02\x03\x04" + "\x05\x06\x07\x08", + .alen = 20, .input = "\x49\x6e\x74\x65\x72\x6e\x65\x74" "\x2d\x44\x72\x61\x66\x74\x73\x20" "\x61\x72\x65\x20\x64\x72\x61\x66" @@ -23664,8 +23665,9 @@ static struct aead_testvec rfc7539esp_dec_tv_template[] = { .klen = 36, .iv = "\x01\x02\x03\x04\x05\x06\x07\x08", .assoc = "\xf3\x33\x88\x86\x00\x00\x00\x00" - "\x00\x00\x4e\x91", - .alen = 12, + "\x00\x00\x4e\x91\x01\x02\x03\x04" + "\x05\x06\x07\x08", + .alen = 20, .input = "\x64\xa0\x86\x15\x75\x86\x1a\xf4" "\x60\xf0\x62\xc7\x9b\xe6\x43\xbd" "\x5e\x80\x5c\xfd\x34\x5c\xf3\x89" |