--- /dev/null
+/*
+ * 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/internal/hash.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/hash.h>
+#include "internal.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_ahash_spawn ghash;
+};
+
+struct crypto_gcm_ctx {
+ struct crypto_ablkcipher *ctr;
+ struct crypto_ahash *ghash;
+};
+
+struct crypto_rfc4106_ctx {
+ struct crypto_aead *child;
+ u8 nonce[4];
+};
+
+struct crypto_rfc4543_instance_ctx {
+ struct crypto_aead_spawn aead;
+ struct crypto_skcipher_spawn null;
+};
+
+struct crypto_rfc4543_ctx {
+ struct crypto_aead *child;
+ struct crypto_blkcipher *null;
+ u8 nonce[4];
+};
+
+struct crypto_rfc4543_req_ctx {
+ u8 auth_tag[16];
+ u8 assocbuf[32];
+ struct scatterlist cipher[1];
+ struct scatterlist payload[2];
+ struct scatterlist assoc[2];
+ struct aead_request subreq;
+};
+
+struct crypto_gcm_ghash_ctx {
+ unsigned int cryptlen;
+ struct scatterlist *src;
+ void (*complete)(struct aead_request *req, int err);
+};
+
+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_ctx;
+ union {
+ struct ahash_request ahreq;
+ struct ablkcipher_request abreq;
+ } u;
+};
+
+struct crypto_gcm_setkey_result {
+ int err;
+ struct completion completion;
+};
+
+static void *gcm_zeroes;
+
+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_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_ahash *ghash = ctx->ghash;
+ 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;
+
+ 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));
+ crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
+ CRYPTO_TFM_RES_MASK);
+
+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);
+ 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);
+}
+
+static inline unsigned int gcm_remain(unsigned int len)
+{
+ len &= 0xfU;
+ return len ? 16 - len : 0;
+}
+
+static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
+static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
+
+static int gcm_hash_update(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx,
+ crypto_completion_t compl,
+ struct scatterlist *src,
+ unsigned int len)
+{
+ struct ahash_request *ahreq = &pctx->u.ahreq;
+
+ ahash_request_set_callback(ahreq, aead_request_flags(req),
+ compl, req);
+ ahash_request_set_crypt(ahreq, src, NULL, len);
+
+ return crypto_ahash_update(ahreq);
+}
+
+static int gcm_hash_remain(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx,
+ unsigned int remain,
+ crypto_completion_t compl)
+{
+ struct ahash_request *ahreq = &pctx->u.ahreq;
+
+ ahash_request_set_callback(ahreq, aead_request_flags(req),
+ compl, req);
+ sg_init_one(pctx->src, gcm_zeroes, remain);
+ ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
+
+ return crypto_ahash_update(ahreq);
+}
+
+static int gcm_hash_len(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx)
+{
+ struct ahash_request *ahreq = &pctx->u.ahreq;
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+ u128 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->src, pctx->iauth_tag, 16);
+ ahash_request_set_callback(ahreq, aead_request_flags(req),
+ gcm_hash_len_done, req);
+ ahash_request_set_crypt(ahreq, pctx->src,
+ NULL, sizeof(lengths));
+
+ return crypto_ahash_update(ahreq);
+}
+
+static int gcm_hash_final(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx)
+{
+ struct ahash_request *ahreq = &pctx->u.ahreq;
+
+ ahash_request_set_callback(ahreq, aead_request_flags(req),
+ gcm_hash_final_done, req);
+ ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
+
+ return crypto_ahash_final(ahreq);
+}
+
+static void __gcm_hash_final_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+
+ if (!err)
+ crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
+
+ gctx->complete(req, err);
+}
+
+static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_final_done(req, err);
+}
+
+static void __gcm_hash_len_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+
+ if (!err) {
+ err = gcm_hash_final(req, pctx);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ }
+
+ __gcm_hash_final_done(req, err);
+}
+
+static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_len_done(req, err);
+}
+
+static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+
+ if (!err) {
+ err = gcm_hash_len(req, pctx);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ }
+
+ __gcm_hash_len_done(req, err);
+}
+
+static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
+ int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_crypt_remain_done(req, err);
+}
+
+static void __gcm_hash_crypt_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+ unsigned int remain;
+
+ if (!err) {
+ remain = gcm_remain(gctx->cryptlen);
+ BUG_ON(!remain);
+ err = gcm_hash_remain(req, pctx, remain,
+ gcm_hash_crypt_remain_done);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ }
+
+ __gcm_hash_crypt_remain_done(req, err);
+}
+
+static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_crypt_done(req, err);
+}
+
+static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+ crypto_completion_t compl;
+ unsigned int remain = 0;
+
+ if (!err && gctx->cryptlen) {
+ remain = gcm_remain(gctx->cryptlen);
+ compl = remain ? gcm_hash_crypt_done :
+ gcm_hash_crypt_remain_done;
+ err = gcm_hash_update(req, pctx, compl,
+ gctx->src, gctx->cryptlen);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ }
+
+ if (remain)
+ __gcm_hash_crypt_done(req, err);
+ else
+ __gcm_hash_crypt_remain_done(req, err);
+}
+
+static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
+ int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_assoc_remain_done(req, err);
+}
+
+static void __gcm_hash_assoc_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ unsigned int remain;
+
+ if (!err) {
+ remain = gcm_remain(req->assoclen);
+ BUG_ON(!remain);
+ err = gcm_hash_remain(req, pctx, remain,
+ gcm_hash_assoc_remain_done);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ }
+
+ __gcm_hash_assoc_remain_done(req, err);
+}
+
+static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_assoc_done(req, err);
+}
+
+static void __gcm_hash_init_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ crypto_completion_t compl;
+ unsigned int remain = 0;
+
+ if (!err && req->assoclen) {
+ remain = gcm_remain(req->assoclen);
+ compl = remain ? gcm_hash_assoc_done :
+ gcm_hash_assoc_remain_done;
+ err = gcm_hash_update(req, pctx, compl,
+ req->assoc, req->assoclen);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ }
+
+ if (remain)
+ __gcm_hash_assoc_done(req, err);
+ else
+ __gcm_hash_assoc_remain_done(req, err);
+}
+
+static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+
+ __gcm_hash_init_done(req, err);
+}
+
+static int gcm_hash(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx)
+{
+ struct ahash_request *ahreq = &pctx->u.ahreq;
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+ struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+ unsigned int remain;
+ crypto_completion_t compl;
+ int err;
+
+ ahash_request_set_tfm(ahreq, ctx->ghash);
+
+ ahash_request_set_callback(ahreq, aead_request_flags(req),
+ gcm_hash_init_done, req);
+ err = crypto_ahash_init(ahreq);
+ if (err)
+ return err;
+ remain = gcm_remain(req->assoclen);
+ compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
+ err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
+ if (err)
+ return err;
+ if (remain) {
+ err = gcm_hash_remain(req, pctx, remain,
+ gcm_hash_assoc_remain_done);
+ if (err)
+ return err;
+ }
+ remain = gcm_remain(gctx->cryptlen);
+ compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
+ err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
+ if (err)
+ return err;
+ if (remain) {
+ err = gcm_hash_remain(req, pctx, remain,
+ gcm_hash_crypt_remain_done);
+ if (err)
+ return err;
+ }
+ err = gcm_hash_len(req, pctx);
+ if (err)
+ return err;
+ err = gcm_hash_final(req, pctx);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static void gcm_enc_copy_hash(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ u8 *auth_tag = pctx->auth_tag;
+
+ scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
+ crypto_aead_authsize(aead), 1);
+}
+
+static void gcm_enc_hash_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+
+ if (!err)
+ gcm_enc_copy_hash(req, pctx);
+
+ aead_request_complete(req, err);
+}
+
+static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+
+ if (!err) {
+ err = gcm_hash(req, pctx);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ else if (!err) {
+ crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
+ gcm_enc_copy_hash(req, pctx);
+ }
+ }
+
+ 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->u.abreq;
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+ int err;
+
+ crypto_gcm_init_crypt(abreq, req, req->cryptlen);
+ ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+ gcm_encrypt_done, req);
+
+ gctx->src = req->dst;
+ gctx->cryptlen = req->cryptlen;
+ gctx->complete = gcm_enc_hash_done;
+
+ err = crypto_ablkcipher_encrypt(abreq);
+ if (err)
+ return err;
+
+ err = gcm_hash(req, pctx);
+ if (err)
+ return err;
+
+ crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
+ gcm_enc_copy_hash(req, pctx);
+
+ return 0;
+}
+
+static int crypto_gcm_verify(struct aead_request *req,
+ struct crypto_gcm_req_priv_ctx *pctx)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ 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_xor(auth_tag, iauth_tag, 16);
+ scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
+ return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
+}
+
+static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+
+ if (!err)
+ err = crypto_gcm_verify(req, pctx);
+
+ aead_request_complete(req, err);
+}
+
+static void gcm_dec_hash_done(struct aead_request *req, int err)
+{
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct ablkcipher_request *abreq = &pctx->u.abreq;
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+
+ if (!err) {
+ ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+ gcm_decrypt_done, req);
+ crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
+ err = crypto_ablkcipher_decrypt(abreq);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+ else if (!err)
+ err = crypto_gcm_verify(req, pctx);
+ }
+
+ 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->u.abreq;
+ struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
+ unsigned int authsize = crypto_aead_authsize(aead);
+ unsigned int cryptlen = req->cryptlen;
+ int err;
+
+ if (cryptlen < authsize)
+ return -EINVAL;
+ cryptlen -= authsize;
+
+ gctx->src = req->src;
+ gctx->cryptlen = cryptlen;
+ gctx->complete = gcm_dec_hash_done;
+
+ err = gcm_hash(req, pctx);
+ if (err)
+ return err;
+
+ ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+ gcm_decrypt_done, req);
+ crypto_gcm_init_crypt(abreq, req, cryptlen);
+ err = crypto_ablkcipher_decrypt(abreq);
+ if (err)
+ return err;
+
+ return crypto_gcm_verify(req, pctx);
+}
+
+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;
+ 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;
+
+ ctx->ctr = ctr;
+ ctx->ghash = ghash;
+
+ align = crypto_tfm_alg_alignmask(tfm);
+ align &= ~(crypto_tfm_ctx_alignment() - 1);
+ tfm->crt_aead.reqsize = align +
+ offsetof(struct crypto_gcm_req_priv_ctx, u) +
+ max(sizeof(struct ablkcipher_request) +
+ crypto_ablkcipher_reqsize(ctr),
+ sizeof(struct ahash_request) +
+ crypto_ahash_reqsize(ghash));
+
+ return 0;
+
+err_free_hash:
+ crypto_free_ahash(ghash);
+ return err;
+}
+
+static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_ahash(ctx->ghash);
+ crypto_free_ablkcipher(ctx->ctr);
+}
+
+static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
+ const char *full_name,
+ const char *ctr_name,
+ const char *ghash_name)
+{
+ struct crypto_attr_type *algt;
+ struct crypto_instance *inst;
+ struct crypto_alg *ctr;
+ struct crypto_alg *ghash_alg;
+ struct ahash_alg *ghash_ahash_alg;
+ struct gcm_instance_ctx *ctx;
+ int err;
+
+ algt = crypto_get_attr_type(tb);
+ if (IS_ERR(algt))
+ return ERR_CAST(algt);
+
+ if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+ return ERR_PTR(-EINVAL);
+
+ ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
+ CRYPTO_ALG_TYPE_HASH,
+ CRYPTO_ALG_TYPE_AHASH_MASK);
+ if (IS_ERR(ghash_alg))
+ return ERR_CAST(ghash_alg);
+
+ err = -ENOMEM;
+ inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+ if (!inst)
+ goto out_put_ghash;
+
+ ctx = crypto_instance_ctx(inst);
+ ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
+ err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
+ inst);
+ if (err)
+ goto err_free_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_drop_ghash;
+
+ 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,%s)", ctr->cra_driver_name,
+ ghash_alg->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:
+ crypto_mod_put(ghash_alg);
+ return inst;
+
+out_put_ctr:
+ crypto_drop_skcipher(&ctx->ctr);
+err_drop_ghash:
+ crypto_drop_ahash(&ctx->ghash);
+err_free_inst:
+ kfree(inst);
+out_put_ghash:
+ inst = ERR_PTR(err);
+ goto out;
+}
+
+static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
+{
+ 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]);
+ if (IS_ERR(cipher_name))
+ return ERR_CAST(cipher_name);
+
+ 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, "ghash");
+}
+
+static void crypto_gcm_free(struct crypto_instance *inst)
+{
+ struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
+
+ crypto_drop_skcipher(&ctx->ctr);
+ crypto_drop_ahash(&ctx->ghash);
+ 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)
+{
+ const char *ctr_name;
+ const char *ghash_name;
+ char full_name[CRYPTO_MAX_ALG_NAME];
+
+ ctr_name = crypto_attr_alg_name(tb[1]);
+ if (IS_ERR(ctr_name))
+ return ERR_CAST(ctr_name);
+
+ ghash_name = crypto_attr_alg_name(tb[2]);
+ if (IS_ERR(ghash_name))
+ return ERR_CAST(ghash_name);
+
+ if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
+ ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_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);
+ if (IS_ERR(algt))
+ return ERR_CAST(algt);
+
+ if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+ return ERR_PTR(-EINVAL);
+
+ ccm_name = crypto_attr_alg_name(tb[1]);
+ if (IS_ERR(ccm_name))
+ return ERR_CAST(ccm_name);
+
+ 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 inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_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 int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
+ unsigned int keylen)
+{
+ struct crypto_rfc4543_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_rfc4543_setauthsize(struct crypto_aead *parent,
+ unsigned int authsize)
+{
+ struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
+
+ if (authsize != 16)
+ return -EINVAL;
+
+ return crypto_aead_setauthsize(ctx->child, authsize);
+}
+
+static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
+
+ if (!err) {
+ scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
+ req->cryptlen,
+ crypto_aead_authsize(aead), 1);
+ }
+
+ aead_request_complete(req, err);
+}
+
+static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
+ bool enc)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
+ struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
+ struct aead_request *subreq = &rctx->subreq;
+ struct scatterlist *src = req->src;
+ struct scatterlist *cipher = rctx->cipher;
+ struct scatterlist *payload = rctx->payload;
+ struct scatterlist *assoc = rctx->assoc;
+ unsigned int authsize = crypto_aead_authsize(aead);
+ unsigned int assoclen = req->assoclen;
+ struct page *srcp;
+ u8 *vsrc;
+ u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
+ crypto_aead_alignmask(ctx->child) + 1);
+
+ memcpy(iv, ctx->nonce, 4);
+ memcpy(iv + 4, req->iv, 8);
+
+ /* construct cipher/plaintext */
+ if (enc)
+ memset(rctx->auth_tag, 0, authsize);
+ else
+ scatterwalk_map_and_copy(rctx->auth_tag, src,
+ req->cryptlen - authsize,
+ authsize, 0);
+
+ sg_init_one(cipher, rctx->auth_tag, authsize);
+
+ /* construct the aad */
+ srcp = sg_page(src);
+ vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
+
+ sg_init_table(payload, 2);
+ sg_set_buf(payload, req->iv, 8);
+ scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
+ assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
+
+ if (req->assoc->length == req->assoclen) {
+ sg_init_table(assoc, 2);
+ sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
+ req->assoc->offset);
+ } else {
+ BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
+
+ scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
+ req->assoclen, 0);
+
+ sg_init_table(assoc, 2);
+ sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
+ }
+ scatterwalk_crypto_chain(assoc, payload, 0, 2);
+
+ aead_request_set_tfm(subreq, ctx->child);
+ aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
+ req);
+ aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
+ aead_request_set_assoc(subreq, assoc, assoclen);
+
+ return subreq;
+}
+
+static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
+ unsigned int authsize = crypto_aead_authsize(aead);
+ unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
+ struct blkcipher_desc desc = {
+ .tfm = ctx->null,
+ };
+
+ return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
+}
+
+static int crypto_rfc4543_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
+ struct aead_request *subreq;
+ int err;
+
+ if (req->src != req->dst) {
+ err = crypto_rfc4543_copy_src_to_dst(req, true);
+ if (err)
+ return err;
+ }
+
+ subreq = crypto_rfc4543_crypt(req, true);
+ err = crypto_aead_encrypt(subreq);
+ if (err)
+ return err;
+
+ scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
+ crypto_aead_authsize(aead), 1);
+
+ return 0;
+}
+
+static int crypto_rfc4543_decrypt(struct aead_request *req)
+{
+ int err;
+
+ if (req->src != req->dst) {
+ err = crypto_rfc4543_copy_src_to_dst(req, false);
+ if (err)
+ return err;
+ }
+
+ req = crypto_rfc4543_crypt(req, false);
+
+ return crypto_aead_decrypt(req);
+}
+
+static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_instance *inst = (void *)tfm->__crt_alg;
+ struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
+ struct crypto_aead_spawn *spawn = &ictx->aead;
+ struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct crypto_aead *aead;
+ struct crypto_blkcipher *null;
+ unsigned long align;
+ int err = 0;
+
+ aead = crypto_spawn_aead(spawn);
+ if (IS_ERR(aead))
+ return PTR_ERR(aead);
+
+ null = crypto_spawn_blkcipher(&ictx->null.base);
+ err = PTR_ERR(null);
+ if (IS_ERR(null))
+ goto err_free_aead;
+
+ ctx->child = aead;
+ ctx->null = null;
+
+ align = crypto_aead_alignmask(aead);
+ align &= ~(crypto_tfm_ctx_alignment() - 1);
+ tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
+ ALIGN(crypto_aead_reqsize(aead),
+ crypto_tfm_ctx_alignment()) +
+ align + 16;
+
+ return 0;
+
+err_free_aead:
+ crypto_free_aead(aead);
+ return err;
+}
+
+static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_aead(ctx->child);
+ crypto_free_blkcipher(ctx->null);
+}
+
+static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
+{
+ struct crypto_attr_type *algt;
+ struct crypto_instance *inst;
+ struct crypto_aead_spawn *spawn;
+ struct crypto_alg *alg;
+ struct crypto_rfc4543_instance_ctx *ctx;
+ const char *ccm_name;
+ int err;
+
+ algt = crypto_get_attr_type(tb);
+ if (IS_ERR(algt))
+ return ERR_CAST(algt);
+
+ if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+ return ERR_PTR(-EINVAL);
+
+ ccm_name = crypto_attr_alg_name(tb[1]);
+ if (IS_ERR(ccm_name))
+ return ERR_CAST(ccm_name);
+
+ inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+ if (!inst)
+ return ERR_PTR(-ENOMEM);
+
+ ctx = crypto_instance_ctx(inst);
+ spawn = &ctx->aead;
+ 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);
+
+ crypto_set_skcipher_spawn(&ctx->null, inst);
+ err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
+ CRYPTO_ALG_ASYNC);
+ if (err)
+ goto out_drop_alg;
+
+ crypto_skcipher_spawn_alg(&ctx->null);
+
+ err = -EINVAL;
+
+ /* We only support 16-byte blocks. */
+ if (alg->cra_aead.ivsize != 16)
+ goto out_drop_ecbnull;
+
+ /* Not a stream cipher? */
+ if (alg->cra_blocksize != 1)
+ goto out_drop_ecbnull;
+
+ err = -ENAMETOOLONG;
+ if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+ "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
+ snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+ "rfc4543(%s)", alg->cra_driver_name) >=
+ CRYPTO_MAX_ALG_NAME)
+ goto out_drop_ecbnull;
+
+ 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_rfc4543_ctx);
+
+ inst->alg.cra_init = crypto_rfc4543_init_tfm;
+ inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
+
+ inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
+ inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
+ inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
+ inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
+
+ inst->alg.cra_aead.geniv = "seqiv";
+
+out:
+ return inst;
+
+out_drop_ecbnull:
+ crypto_drop_skcipher(&ctx->null);
+out_drop_alg:
+ crypto_drop_aead(spawn);
+out_free_inst:
+ kfree(inst);
+ inst = ERR_PTR(err);
+ goto out;
+}
+
+static void crypto_rfc4543_free(struct crypto_instance *inst)
+{
+ struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
+
+ crypto_drop_aead(&ctx->aead);
+ crypto_drop_skcipher(&ctx->null);
+
+ kfree(inst);
+}
+
+static struct crypto_template crypto_rfc4543_tmpl = {
+ .name = "rfc4543",
+ .alloc = crypto_rfc4543_alloc,
+ .free = crypto_rfc4543_free,
+ .module = THIS_MODULE,
+};
+
+static int __init crypto_gcm_module_init(void)
+{
+ int err;
+
+ gcm_zeroes = kzalloc(16, GFP_KERNEL);
+ if (!gcm_zeroes)
+ return -ENOMEM;
+
+ 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;
+
+ err = crypto_register_template(&crypto_rfc4543_tmpl);
+ if (err)
+ goto out_undo_rfc4106;
+
+ return 0;
+
+out_undo_rfc4106:
+ crypto_unregister_template(&crypto_rfc4106_tmpl);
+out_undo_gcm:
+ crypto_unregister_template(&crypto_gcm_tmpl);
+out_undo_base:
+ crypto_unregister_template(&crypto_gcm_base_tmpl);
+out:
+ kfree(gcm_zeroes);
+ return err;
+}
+
+static void __exit crypto_gcm_module_exit(void)
+{
+ kfree(gcm_zeroes);
+ crypto_unregister_template(&crypto_rfc4543_tmpl);
+ 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_CRYPTO("gcm_base");
+MODULE_ALIAS_CRYPTO("rfc4106");
+MODULE_ALIAS_CRYPTO("rfc4543");
+MODULE_ALIAS_CRYPTO("gcm");
Code Review / kvmfornfv.git / blobdiff