Commit 74790922 authored by Herbert Xu's avatar Herbert Xu

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: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Tested-by: default avatarMartin Willi <martin@strongswan.org>
parent 6e8ec66c
......@@ -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 @@ static struct crypto_instance *chachapoly_alloc(struct rtattr **tb,
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");
......@@ -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"
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