* Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
*/
-#include <crypto/gf128mul.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
-#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <crypto/gcm.h>
-#include <crypto/hash.h>
+#include <crypto/gf128hash.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
struct gcm_instance_ctx {
struct crypto_skcipher_spawn ctr;
- struct crypto_ahash_spawn ghash;
};
struct crypto_gcm_ctx {
struct crypto_skcipher *ctr;
- struct crypto_ahash *ghash;
+ struct ghash_key ghash;
};
struct crypto_rfc4106_ctx {
struct aead_request subreq;
};
-struct crypto_gcm_ghash_ctx {
- unsigned int cryptlen;
- struct scatterlist *src;
- int (*complete)(struct aead_request *req, u32 flags);
-};
-
struct crypto_gcm_req_priv_ctx {
u8 iv[16];
u8 auth_tag[16];
u8 iauth_tag[16];
struct scatterlist src[3];
struct scatterlist dst[3];
- struct scatterlist sg;
- struct crypto_gcm_ghash_ctx ghash_ctx;
- union {
- struct ahash_request ahreq;
- struct skcipher_request skreq;
- } u;
+ struct skcipher_request skreq; /* Must be last */
};
-static struct {
- u8 buf[16];
- struct scatterlist sg;
-} *gcm_zeroes;
-
static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
struct aead_request *req)
{
unsigned int keylen)
{
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
- struct crypto_ahash *ghash = ctx->ghash;
struct crypto_skcipher *ctr = ctx->ctr;
struct {
- be128 hash;
+ u8 h[GHASH_BLOCK_SIZE];
u8 iv[16];
struct crypto_wait wait;
return -ENOMEM;
crypto_init_wait(&data->wait);
- sg_init_one(data->sg, &data->hash, sizeof(data->hash));
+ sg_init_one(data->sg, data->h, sizeof(data->h));
skcipher_request_set_tfm(&data->req, ctr);
skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_req_done,
&data->wait);
skcipher_request_set_crypt(&data->req, data->sg, data->sg,
- sizeof(data->hash), data->iv);
+ sizeof(data->h), data->iv);
err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
&data->wait);
if (err)
goto out;
- crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
- crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
+ ghash_preparekey(&ctx->ghash, data->h);
out:
kfree_sensitive(data);
return err;
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct skcipher_request *skreq = &pctx->u.skreq;
+ struct skcipher_request *skreq = &pctx->skreq;
struct scatterlist *dst;
dst = req->src == req->dst ? pctx->src : pctx->dst;
pctx->iv);
}
-static inline unsigned int gcm_remain(unsigned int len)
-{
- len &= 0xfU;
- return len ? 16 - len : 0;
-}
-
-static void gcm_hash_len_done(void *data, int err);
-
-static int gcm_hash_update(struct aead_request *req,
- crypto_completion_t compl,
- struct scatterlist *src,
- unsigned int len, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct ahash_request *ahreq = &pctx->u.ahreq;
-
- ahash_request_set_callback(ahreq, flags, compl, req);
- ahash_request_set_crypt(ahreq, src, NULL, len);
-
- return crypto_ahash_update(ahreq);
-}
-
-static int gcm_hash_remain(struct aead_request *req,
- unsigned int remain,
- crypto_completion_t compl, u32 flags)
-{
- return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
-}
-
-static int gcm_hash_len(struct aead_request *req, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct ahash_request *ahreq = &pctx->u.ahreq;
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- be128 lengths;
-
- lengths.a = cpu_to_be64(req->assoclen * 8);
- lengths.b = cpu_to_be64(gctx->cryptlen * 8);
- memcpy(pctx->iauth_tag, &lengths, 16);
- sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
- ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
- ahash_request_set_crypt(ahreq, &pctx->sg,
- pctx->iauth_tag, sizeof(lengths));
-
- return crypto_ahash_finup(ahreq);
-}
-
-static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
-
- return gctx->complete(req, flags);
-}
-
-static void gcm_hash_len_done(void *data, int err)
-{
- struct aead_request *req = data;
-
- if (err)
- goto out;
-
- err = gcm_hash_len_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
-
-out:
- aead_request_complete(req, err);
-}
-
-static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
-{
- return gcm_hash_len(req, flags) ?:
- gcm_hash_len_continue(req, flags);
-}
-
-static void gcm_hash_crypt_remain_done(void *data, int err)
-{
- struct aead_request *req = data;
-
- if (err)
- goto out;
-
- err = gcm_hash_crypt_remain_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
-
-out:
- aead_request_complete(req, err);
-}
-
-static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- unsigned int remain;
-
- remain = gcm_remain(gctx->cryptlen);
- if (remain)
- return gcm_hash_remain(req, remain,
- gcm_hash_crypt_remain_done, flags) ?:
- gcm_hash_crypt_remain_continue(req, flags);
-
- return gcm_hash_crypt_remain_continue(req, flags);
-}
-
-static void gcm_hash_crypt_done(void *data, int err)
-{
- struct aead_request *req = data;
-
- if (err)
- goto out;
-
- err = gcm_hash_crypt_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
-
-out:
- aead_request_complete(req, err);
-}
-
-static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
-
- if (gctx->cryptlen)
- return gcm_hash_update(req, gcm_hash_crypt_done,
- gctx->src, gctx->cryptlen, flags) ?:
- gcm_hash_crypt_continue(req, flags);
-
- return gcm_hash_crypt_remain_continue(req, flags);
-}
-
-static void gcm_hash_assoc_remain_done(void *data, int err)
-{
- struct aead_request *req = data;
-
- if (err)
- goto out;
-
- err = gcm_hash_assoc_remain_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
-
-out:
- aead_request_complete(req, err);
-}
-
-static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
+static void ghash_update_sg_and_pad(struct ghash_ctx *ghash,
+ struct scatterlist *sg, unsigned int len)
{
- unsigned int remain;
+ static const u8 zeroes[GHASH_BLOCK_SIZE];
- remain = gcm_remain(req->assoclen);
- if (remain)
- return gcm_hash_remain(req, remain,
- gcm_hash_assoc_remain_done, flags) ?:
- gcm_hash_assoc_remain_continue(req, flags);
+ if (len) {
+ unsigned int pad_len = -len % GHASH_BLOCK_SIZE;
+ struct scatter_walk walk;
- return gcm_hash_assoc_remain_continue(req, flags);
-}
+ scatterwalk_start(&walk, sg);
+ do {
+ unsigned int n = scatterwalk_next(&walk, len);
-static void gcm_hash_assoc_done(void *data, int err)
-{
- struct aead_request *req = data;
+ ghash_update(ghash, walk.addr, n);
+ scatterwalk_done_src(&walk, n);
+ len -= n;
+ } while (len);
- if (err)
- goto out;
-
- err = gcm_hash_assoc_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
-
-out:
- aead_request_complete(req, err);
-}
-
-static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
-{
- if (req->assoclen)
- return gcm_hash_update(req, gcm_hash_assoc_done,
- req->src, req->assoclen, flags) ?:
- gcm_hash_assoc_continue(req, flags);
-
- return gcm_hash_assoc_remain_continue(req, flags);
+ if (pad_len)
+ ghash_update(ghash, zeroes, pad_len);
+ }
}
-static void gcm_hash_init_done(void *data, int err)
+static void gcm_hash(struct aead_request *req, struct scatterlist *ctext,
+ unsigned int datalen, u8 out[GHASH_BLOCK_SIZE])
{
- struct aead_request *req = data;
-
- if (err)
- goto out;
+ const struct crypto_gcm_ctx *ctx =
+ crypto_aead_ctx(crypto_aead_reqtfm(req));
+ __be64 lengths[2] = {
+ cpu_to_be64(8 * (u64)req->assoclen),
+ cpu_to_be64(8 * (u64)datalen),
+ };
+ struct ghash_ctx ghash;
- err = gcm_hash_init_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
+ ghash_init(&ghash, &ctx->ghash);
-out:
- aead_request_complete(req, err);
-}
+ /* Associated data, then zero-padding to the next 16-byte boundary */
+ ghash_update_sg_and_pad(&ghash, req->src, req->assoclen);
-static int gcm_hash(struct aead_request *req, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct ahash_request *ahreq = &pctx->u.ahreq;
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ /* Ciphertext, then zero-padding to the next 16-byte boundary */
+ ghash_update_sg_and_pad(&ghash, ctext, datalen);
- ahash_request_set_tfm(ahreq, ctx->ghash);
+ /* Lengths block */
+ ghash_update(&ghash, (const u8 *)lengths, sizeof(lengths));
- ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
- return crypto_ahash_init(ahreq) ?:
- gcm_hash_init_continue(req, flags);
+ ghash_final(&ghash, out);
}
-static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
+static int gcm_add_auth_tag(struct aead_request *req)
{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
struct crypto_aead *aead = crypto_aead_reqtfm(req);
- u8 *auth_tag = pctx->auth_tag;
-
- crypto_xor(auth_tag, pctx->iauth_tag, 16);
- scatterwalk_map_and_copy(auth_tag, req->dst,
- req->assoclen + req->cryptlen,
- crypto_aead_authsize(aead), 1);
- return 0;
-}
-
-static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
-{
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
- gctx->cryptlen = req->cryptlen;
- gctx->complete = gcm_enc_copy_hash;
-
- return gcm_hash(req, flags);
+ gcm_hash(req, sg_next(req->src == req->dst ? pctx->src : pctx->dst),
+ req->cryptlen, pctx->iauth_tag);
+ crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
+ memcpy_to_sglist(req->dst, req->assoclen + req->cryptlen,
+ pctx->auth_tag, crypto_aead_authsize(aead));
+ return 0;
}
static void gcm_encrypt_done(void *data, int err)
if (err)
goto out;
- err = gcm_encrypt_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
+ err = gcm_add_auth_tag(req);
out:
aead_request_complete(req, err);
static int crypto_gcm_encrypt(struct aead_request *req)
{
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct skcipher_request *skreq = &pctx->u.skreq;
+ struct skcipher_request *skreq = &pctx->skreq;
u32 flags = aead_request_flags(req);
crypto_gcm_init_common(req);
crypto_gcm_init_crypt(req, req->cryptlen);
skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
- return crypto_skcipher_encrypt(skreq) ?:
- gcm_encrypt_continue(req, flags);
+ return crypto_skcipher_encrypt(skreq) ?: gcm_add_auth_tag(req);
}
static int crypto_gcm_verify(struct aead_request *req)
aead_request_complete(req, err);
}
-static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
-{
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct skcipher_request *skreq = &pctx->u.skreq;
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
-
- crypto_gcm_init_crypt(req, gctx->cryptlen);
- skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
- return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
-}
-
static int crypto_gcm_decrypt(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- unsigned int authsize = crypto_aead_authsize(aead);
- unsigned int cryptlen = req->cryptlen;
- u32 flags = aead_request_flags(req);
-
- cryptlen -= authsize;
+ struct skcipher_request *skreq = &pctx->skreq;
+ unsigned int datalen = req->cryptlen - crypto_aead_authsize(aead);
crypto_gcm_init_common(req);
- gctx->src = sg_next(pctx->src);
- gctx->cryptlen = cryptlen;
- gctx->complete = gcm_dec_hash_continue;
+ gcm_hash(req, sg_next(pctx->src), datalen, pctx->iauth_tag);
- return gcm_hash(req, flags);
+ crypto_gcm_init_crypt(req, datalen);
+ skcipher_request_set_callback(skreq, aead_request_flags(req),
+ gcm_decrypt_done, req);
+ return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
}
static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_skcipher *ctr;
- struct crypto_ahash *ghash;
unsigned long align;
- int err;
-
- ghash = crypto_spawn_ahash(&ictx->ghash);
- if (IS_ERR(ghash))
- return PTR_ERR(ghash);
ctr = crypto_spawn_skcipher(&ictx->ctr);
- err = PTR_ERR(ctr);
if (IS_ERR(ctr))
- goto err_free_hash;
+ return PTR_ERR(ctr);
ctx->ctr = ctr;
- ctx->ghash = ghash;
align = crypto_aead_alignmask(tfm);
align &= ~(crypto_tfm_ctx_alignment() - 1);
crypto_aead_set_reqsize(tfm,
- align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
- max(sizeof(struct skcipher_request) +
- crypto_skcipher_reqsize(ctr),
- sizeof(struct ahash_request) +
- crypto_ahash_reqsize(ghash)));
-
+ align + sizeof(struct crypto_gcm_req_priv_ctx) +
+ crypto_skcipher_reqsize(ctr));
return 0;
-
-err_free_hash:
- crypto_free_ahash(ghash);
- return err;
}
static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
{
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
- crypto_free_ahash(ctx->ghash);
crypto_free_skcipher(ctx->ctr);
}
struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
crypto_drop_skcipher(&ctx->ctr);
- crypto_drop_ahash(&ctx->ghash);
kfree(inst);
}
static int crypto_gcm_create_common(struct crypto_template *tmpl,
- struct rtattr **tb,
- const char *ctr_name,
- const char *ghash_name)
+ struct rtattr **tb, const char *ctr_name)
{
struct skcipher_alg_common *ctr;
u32 mask;
struct aead_instance *inst;
struct gcm_instance_ctx *ctx;
- struct hash_alg_common *ghash;
int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
return -ENOMEM;
ctx = aead_instance_ctx(inst);
- err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
- ghash_name, 0, mask);
- if (err)
- goto err_free_inst;
- ghash = crypto_spawn_ahash_alg(&ctx->ghash);
-
- err = -EINVAL;
- if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
- ghash->digestsize != 16)
- goto err_free_inst;
-
err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
ctr_name, 0, mask);
if (err)
goto err_free_inst;
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "gcm_base(%s,%s)", ctr->base.cra_driver_name,
- ghash->base.cra_driver_name) >=
- CRYPTO_MAX_ALG_NAME)
+ "gcm_base(%s,ghash-lib)",
+ ctr->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
- inst->alg.base.cra_priority = (ghash->base.cra_priority +
- ctr->base.cra_priority) / 2;
+ inst->alg.base.cra_priority = ctr->base.cra_priority;
inst->alg.base.cra_blocksize = 1;
inst->alg.base.cra_alignmask = ctr->base.cra_alignmask;
inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
- return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
+ return crypto_gcm_create_common(tmpl, tb, ctr_name);
}
static int crypto_gcm_base_create(struct crypto_template *tmpl,
if (IS_ERR(ghash_name))
return PTR_ERR(ghash_name);
- return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
+ /*
+ * Originally this parameter allowed requesting a specific
+ * implementation of GHASH. This is no longer supported. Now the best
+ * implementation of GHASH is just always used.
+ */
+ if (strcmp(ghash_name, "ghash") != 0 &&
+ strcmp(ghash_name, "ghash-lib") != 0)
+ return -EINVAL;
+
+ return crypto_gcm_create_common(tmpl, tb, ctr_name);
}
static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
static int __init crypto_gcm_module_init(void)
{
- int err;
-
- gcm_zeroes = kzalloc_obj(*gcm_zeroes);
- if (!gcm_zeroes)
- return -ENOMEM;
-
- sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
-
- err = crypto_register_templates(crypto_gcm_tmpls,
- ARRAY_SIZE(crypto_gcm_tmpls));
- if (err)
- kfree(gcm_zeroes);
-
- return err;
+ return crypto_register_templates(crypto_gcm_tmpls,
+ ARRAY_SIZE(crypto_gcm_tmpls));
}
static void __exit crypto_gcm_module_exit(void)
{
- kfree(gcm_zeroes);
crypto_unregister_templates(crypto_gcm_tmpls,
ARRAY_SIZE(crypto_gcm_tmpls));
}
projects / thirdparty / kernel / stable.git / commitdiff
