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DEFINITIONS
This source file includes following definitions.
- crypto_gcm_reqctx
- crypto_gcm_ghash_init
- crypto_gcm_ghash_update
- crypto_gcm_ghash_update_sg
- crypto_gcm_ghash_flush
- crypto_gcm_ghash_final_xor
- crypto_gcm_setkey_done
- crypto_gcm_setkey
- crypto_gcm_setauthsize
- crypto_gcm_init_crypt
- crypto_gcm_hash
- crypto_gcm_encrypt_done
- crypto_gcm_encrypt
- crypto_gcm_verify
- crypto_gcm_decrypt_done
- crypto_gcm_decrypt
- crypto_gcm_init_tfm
- crypto_gcm_exit_tfm
- crypto_gcm_alloc_common
- crypto_gcm_alloc
- crypto_gcm_free
- crypto_gcm_base_alloc
- crypto_rfc4106_setkey
- crypto_rfc4106_setauthsize
- crypto_rfc4106_crypt
- crypto_rfc4106_encrypt
- crypto_rfc4106_decrypt
- crypto_rfc4106_init_tfm
- crypto_rfc4106_exit_tfm
- crypto_rfc4106_alloc
- crypto_rfc4106_free
- crypto_gcm_module_init
- crypto_gcm_module_exit
/*
* GCM: Galois/Counter Mode.
*
* Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <crypto/gf128mul.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <linux/completion.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
struct gcm_instance_ctx {
struct crypto_skcipher_spawn ctr;
};
struct crypto_gcm_ctx {
struct crypto_ablkcipher *ctr;
struct gf128mul_4k *gf128;
};
struct crypto_rfc4106_ctx {
struct crypto_aead *child;
u8 nonce[4];
};
struct crypto_gcm_ghash_ctx {
u32 bytes;
u32 flags;
struct gf128mul_4k *gf128;
u8 buffer[16];
};
struct crypto_gcm_req_priv_ctx {
u8 auth_tag[16];
u8 iauth_tag[16];
struct scatterlist src[2];
struct scatterlist dst[2];
struct crypto_gcm_ghash_ctx ghash;
struct ablkcipher_request abreq;
};
struct crypto_gcm_setkey_result {
int err;
struct completion completion;
};
static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
struct aead_request *req)
{
unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
}
static void crypto_gcm_ghash_init(struct crypto_gcm_ghash_ctx *ctx, u32 flags,
struct gf128mul_4k *gf128)
{
ctx->bytes = 0;
ctx->flags = flags;
ctx->gf128 = gf128;
memset(ctx->buffer, 0, 16);
}
static void crypto_gcm_ghash_update(struct crypto_gcm_ghash_ctx *ctx,
const u8 *src, unsigned int srclen)
{
u8 *dst = ctx->buffer;
if (ctx->bytes) {
int n = min(srclen, ctx->bytes);
u8 *pos = dst + (16 - ctx->bytes);
ctx->bytes -= n;
srclen -= n;
while (n--)
*pos++ ^= *src++;
if (!ctx->bytes)
gf128mul_4k_lle((be128 *)dst, ctx->gf128);
}
while (srclen >= 16) {
crypto_xor(dst, src, 16);
gf128mul_4k_lle((be128 *)dst, ctx->gf128);
src += 16;
srclen -= 16;
}
if (srclen) {
ctx->bytes = 16 - srclen;
while (srclen--)
*dst++ ^= *src++;
}
}
static void crypto_gcm_ghash_update_sg(struct crypto_gcm_ghash_ctx *ctx,
struct scatterlist *sg, int len)
{
struct scatter_walk walk;
u8 *src;
int n;
if (!len)
return;
scatterwalk_start(&walk, sg);
while (len) {
n = scatterwalk_clamp(&walk, len);
if (!n) {
scatterwalk_start(&walk, scatterwalk_sg_next(walk.sg));
n = scatterwalk_clamp(&walk, len);
}
src = scatterwalk_map(&walk, 0);
crypto_gcm_ghash_update(ctx, src, n);
len -= n;
scatterwalk_unmap(src, 0);
scatterwalk_advance(&walk, n);
scatterwalk_done(&walk, 0, len);
if (len)
crypto_yield(ctx->flags);
}
}
static void crypto_gcm_ghash_flush(struct crypto_gcm_ghash_ctx *ctx)
{
u8 *dst = ctx->buffer;
if (ctx->bytes) {
u8 *tmp = dst + (16 - ctx->bytes);
while (ctx->bytes--)
*tmp++ ^= 0;
gf128mul_4k_lle((be128 *)dst, ctx->gf128);
}
ctx->bytes = 0;
}
static void crypto_gcm_ghash_final_xor(struct crypto_gcm_ghash_ctx *ctx,
unsigned int authlen,
unsigned int cryptlen, u8 *dst)
{
u8 *buf = ctx->buffer;
u128 lengths;
lengths.a = cpu_to_be64(authlen * 8);
lengths.b = cpu_to_be64(cryptlen * 8);
crypto_gcm_ghash_flush(ctx);
crypto_xor(buf, (u8 *)&lengths, 16);
gf128mul_4k_lle((be128 *)buf, ctx->gf128);
crypto_xor(dst, buf, 16);
}
static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
{
struct crypto_gcm_setkey_result *result = req->data;
if (err == -EINPROGRESS)
return;
result->err = err;
complete(&result->completion);
}
static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
struct crypto_ablkcipher *ctr = ctx->ctr;
struct {
be128 hash;
u8 iv[8];
struct crypto_gcm_setkey_result result;
struct scatterlist sg[1];
struct ablkcipher_request req;
} *data;
int err;
crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
CRYPTO_TFM_REQ_MASK);
err = crypto_ablkcipher_setkey(ctr, key, keylen);
if (err)
return err;
crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
CRYPTO_TFM_RES_MASK);
data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
GFP_KERNEL);
if (!data)
return -ENOMEM;
init_completion(&data->result.completion);
sg_init_one(data->sg, &data->hash, sizeof(data->hash));
ablkcipher_request_set_tfm(&data->req, ctr);
ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_gcm_setkey_done,
&data->result);
ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
sizeof(data->hash), data->iv);
err = crypto_ablkcipher_encrypt(&data->req);
if (err == -EINPROGRESS || err == -EBUSY) {
err = wait_for_completion_interruptible(
&data->result.completion);
if (!err)
err = data->result.err;
}
if (err)
goto out;
if (ctx->gf128 != NULL)
gf128mul_free_4k(ctx->gf128);
ctx->gf128 = gf128mul_init_4k_lle(&data->hash);
if (ctx->gf128 == NULL)
err = -ENOMEM;
out:
kfree(data);
return err;
}
static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
{
switch (authsize) {
case 4:
case 8:
case 12:
case 13:
case 14:
case 15:
case 16:
break;
default:
return -EINVAL;
}
return 0;
}
static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
struct aead_request *req,
unsigned int cryptlen)
{
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);
u32 flags = req->base.tfm->crt_flags;
struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
struct scatterlist *dst;
__be32 counter = cpu_to_be32(1);
memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
memcpy(req->iv + 12, &counter, 4);
sg_init_table(pctx->src, 2);
sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
scatterwalk_sg_chain(pctx->src, 2, req->src);
dst = pctx->src;
if (req->src != req->dst) {
sg_init_table(pctx->dst, 2);
sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
scatterwalk_sg_chain(pctx->dst, 2, req->dst);
dst = pctx->dst;
}
ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
cryptlen + sizeof(pctx->auth_tag),
req->iv);
crypto_gcm_ghash_init(ghash, flags, ctx->gf128);
crypto_gcm_ghash_update_sg(ghash, req->assoc, req->assoclen);
crypto_gcm_ghash_flush(ghash);
}
static int crypto_gcm_hash(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
u8 *auth_tag = pctx->auth_tag;
struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
crypto_gcm_ghash_update_sg(ghash, req->dst, req->cryptlen);
crypto_gcm_ghash_final_xor(ghash, req->assoclen, req->cryptlen,
auth_tag);
scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
crypto_aead_authsize(aead), 1);
return 0;
}
static void crypto_gcm_encrypt_done(struct crypto_async_request *areq, int err)
{
struct aead_request *req = areq->data;
if (!err)
err = crypto_gcm_hash(req);
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 ablkcipher_request *abreq = &pctx->abreq;
int err;
crypto_gcm_init_crypt(abreq, req, req->cryptlen);
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
crypto_gcm_encrypt_done, req);
err = crypto_ablkcipher_encrypt(abreq);
if (err)
return err;
return crypto_gcm_hash(req);
}
static int crypto_gcm_verify(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 *ghash = &pctx->ghash;
u8 *auth_tag = pctx->auth_tag;
u8 *iauth_tag = pctx->iauth_tag;
unsigned int authsize = crypto_aead_authsize(aead);
unsigned int cryptlen = req->cryptlen - authsize;
crypto_gcm_ghash_final_xor(ghash, req->assoclen, cryptlen, auth_tag);
authsize = crypto_aead_authsize(aead);
scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
}
static void crypto_gcm_decrypt_done(struct crypto_async_request *areq, int err)
{
struct aead_request *req = areq->data;
if (!err)
err = crypto_gcm_verify(req);
aead_request_complete(req, err);
}
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 ablkcipher_request *abreq = &pctx->abreq;
struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
unsigned int cryptlen = req->cryptlen;
unsigned int authsize = crypto_aead_authsize(aead);
int err;
if (cryptlen < authsize)
return -EINVAL;
cryptlen -= authsize;
crypto_gcm_init_crypt(abreq, req, cryptlen);
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
crypto_gcm_decrypt_done, req);
crypto_gcm_ghash_update_sg(ghash, req->src, cryptlen);
err = crypto_ablkcipher_decrypt(abreq);
if (err)
return err;
return crypto_gcm_verify(req);
}
static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_ablkcipher *ctr;
unsigned long align;
int err;
ctr = crypto_spawn_skcipher(&ictx->ctr);
err = PTR_ERR(ctr);
if (IS_ERR(ctr))
return err;
ctx->ctr = ctr;
ctx->gf128 = NULL;
align = crypto_tfm_alg_alignmask(tfm);
align &= ~(crypto_tfm_ctx_alignment() - 1);
tfm->crt_aead.reqsize = align +
sizeof(struct crypto_gcm_req_priv_ctx) +
crypto_ablkcipher_reqsize(ctr);
return 0;
}
static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
if (ctx->gf128 != NULL)
gf128mul_free_4k(ctx->gf128);
crypto_free_ablkcipher(ctx->ctr);
}
static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
const char *full_name,
const char *ctr_name)
{
struct crypto_attr_type *algt;
struct crypto_instance *inst;
struct crypto_alg *ctr;
struct gcm_instance_ctx *ctx;
int err;
algt = crypto_get_attr_type(tb);
err = PTR_ERR(algt);
if (IS_ERR(algt))
return ERR_PTR(err);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return ERR_PTR(-ENOMEM);
ctx = crypto_instance_ctx(inst);
crypto_set_skcipher_spawn(&ctx->ctr, inst);
err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
if (err)
goto err_free_inst;
ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
/* We only support 16-byte blocks. */
if (ctr->cra_ablkcipher.ivsize != 16)
goto out_put_ctr;
/* Not a stream cipher? */
err = -EINVAL;
if (ctr->cra_blocksize != 1)
goto out_put_ctr;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"gcm_base(%s)", ctr->cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
goto out_put_ctr;
memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.cra_priority = ctr->cra_priority;
inst->alg.cra_blocksize = 1;
inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
inst->alg.cra_type = &crypto_aead_type;
inst->alg.cra_aead.ivsize = 16;
inst->alg.cra_aead.maxauthsize = 16;
inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
inst->alg.cra_init = crypto_gcm_init_tfm;
inst->alg.cra_exit = crypto_gcm_exit_tfm;
inst->alg.cra_aead.setkey = crypto_gcm_setkey;
inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
out:
return inst;
out_put_ctr:
crypto_drop_skcipher(&ctx->ctr);
err_free_inst:
kfree(inst);
inst = ERR_PTR(err);
goto out;
}
static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
{
int err;
const char *cipher_name;
char ctr_name[CRYPTO_MAX_ALG_NAME];
char full_name[CRYPTO_MAX_ALG_NAME];
cipher_name = crypto_attr_alg_name(tb[1]);
err = PTR_ERR(cipher_name);
if (IS_ERR(cipher_name))
return ERR_PTR(err);
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-ENAMETOOLONG);
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-ENAMETOOLONG);
return crypto_gcm_alloc_common(tb, full_name, ctr_name);
}
static void crypto_gcm_free(struct crypto_instance *inst)
{
struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
crypto_drop_skcipher(&ctx->ctr);
kfree(inst);
}
static struct crypto_template crypto_gcm_tmpl = {
.name = "gcm",
.alloc = crypto_gcm_alloc,
.free = crypto_gcm_free,
.module = THIS_MODULE,
};
static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
{
int err;
const char *ctr_name;
char full_name[CRYPTO_MAX_ALG_NAME];
ctr_name = crypto_attr_alg_name(tb[1]);
err = PTR_ERR(ctr_name);
if (IS_ERR(ctr_name))
return ERR_PTR(err);
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s)",
ctr_name) >= CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-ENAMETOOLONG);
return crypto_gcm_alloc_common(tb, full_name, ctr_name);
}
static struct crypto_template crypto_gcm_base_tmpl = {
.name = "gcm_base",
.alloc = crypto_gcm_base_alloc,
.free = crypto_gcm_free,
.module = THIS_MODULE,
};
static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
unsigned int keylen)
{
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
struct crypto_aead *child = ctx->child;
int err;
if (keylen < 4)
return -EINVAL;
keylen -= 4;
memcpy(ctx->nonce, key + keylen, 4);
crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
err = crypto_aead_setkey(child, key, keylen);
crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
CRYPTO_TFM_RES_MASK);
return err;
}
static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
unsigned int authsize)
{
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
switch (authsize) {
case 8:
case 12:
case 16:
break;
default:
return -EINVAL;
}
return crypto_aead_setauthsize(ctx->child, authsize);
}
static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
{
struct aead_request *subreq = aead_request_ctx(req);
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
struct crypto_aead *child = ctx->child;
u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
crypto_aead_alignmask(child) + 1);
memcpy(iv, ctx->nonce, 4);
memcpy(iv + 4, req->iv, 8);
aead_request_set_tfm(subreq, child);
aead_request_set_callback(subreq, req->base.flags, req->base.complete,
req->base.data);
aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
aead_request_set_assoc(subreq, req->assoc, req->assoclen);
return subreq;
}
static int crypto_rfc4106_encrypt(struct aead_request *req)
{
req = crypto_rfc4106_crypt(req);
return crypto_aead_encrypt(req);
}
static int crypto_rfc4106_decrypt(struct aead_request *req)
{
req = crypto_rfc4106_crypt(req);
return crypto_aead_decrypt(req);
}
static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_aead *aead;
unsigned long align;
aead = crypto_spawn_aead(spawn);
if (IS_ERR(aead))
return PTR_ERR(aead);
ctx->child = aead;
align = crypto_aead_alignmask(aead);
align &= ~(crypto_tfm_ctx_alignment() - 1);
tfm->crt_aead.reqsize = sizeof(struct aead_request) +
ALIGN(crypto_aead_reqsize(aead),
crypto_tfm_ctx_alignment()) +
align + 16;
return 0;
}
static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
crypto_free_aead(ctx->child);
}
static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
{
struct crypto_attr_type *algt;
struct crypto_instance *inst;
struct crypto_aead_spawn *spawn;
struct crypto_alg *alg;
const char *ccm_name;
int err;
algt = crypto_get_attr_type(tb);
err = PTR_ERR(algt);
if (IS_ERR(algt))
return ERR_PTR(err);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
ccm_name = crypto_attr_alg_name(tb[1]);
err = PTR_ERR(ccm_name);
if (IS_ERR(ccm_name))
return ERR_PTR(err);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
return ERR_PTR(-ENOMEM);
spawn = crypto_instance_ctx(inst);
crypto_set_aead_spawn(spawn, inst);
err = crypto_grab_aead(spawn, ccm_name, 0,
crypto_requires_sync(algt->type, algt->mask));
if (err)
goto out_free_inst;
alg = crypto_aead_spawn_alg(spawn);
err = -EINVAL;
/* We only support 16-byte blocks. */
if (alg->cra_aead.ivsize != 16)
goto out_drop_alg;
/* Not a stream cipher? */
if (alg->cra_blocksize != 1)
goto out_drop_alg;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
"rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"rfc4106(%s)", alg->cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
goto out_drop_alg;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.cra_priority = alg->cra_priority;
inst->alg.cra_blocksize = 1;
inst->alg.cra_alignmask = alg->cra_alignmask;
inst->alg.cra_type = &crypto_nivaead_type;
inst->alg.cra_aead.ivsize = 8;
inst->alg.cra_aead.maxauthsize = 16;
inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
inst->alg.cra_init = crypto_rfc4106_init_tfm;
inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
inst->alg.cra_aead.geniv = "seqiv";
out:
return inst;
out_drop_alg:
crypto_drop_aead(spawn);
out_free_inst:
kfree(inst);
inst = ERR_PTR(err);
goto out;
}
static void crypto_rfc4106_free(struct crypto_instance *inst)
{
crypto_drop_spawn(crypto_instance_ctx(inst));
kfree(inst);
}
static struct crypto_template crypto_rfc4106_tmpl = {
.name = "rfc4106",
.alloc = crypto_rfc4106_alloc,
.free = crypto_rfc4106_free,
.module = THIS_MODULE,
};
static int __init crypto_gcm_module_init(void)
{
int err;
err = crypto_register_template(&crypto_gcm_base_tmpl);
if (err)
goto out;
err = crypto_register_template(&crypto_gcm_tmpl);
if (err)
goto out_undo_base;
err = crypto_register_template(&crypto_rfc4106_tmpl);
if (err)
goto out_undo_gcm;
out:
return err;
out_undo_gcm:
crypto_unregister_template(&crypto_gcm_tmpl);
out_undo_base:
crypto_unregister_template(&crypto_gcm_base_tmpl);
goto out;
}
static void __exit crypto_gcm_module_exit(void)
{
crypto_unregister_template(&crypto_rfc4106_tmpl);
crypto_unregister_template(&crypto_gcm_tmpl);
crypto_unregister_template(&crypto_gcm_base_tmpl);
}
module_init(crypto_gcm_module_init);
module_exit(crypto_gcm_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Galois/Counter Mode");
MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
MODULE_ALIAS("gcm_base");
MODULE_ALIAS("rfc4106");