| /* |
| * 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); |
| crypto_aead_set_reqsize(__crypto_aead_cast(tfm), |
| 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); |
| crypto_aead_set_reqsize(__crypto_aead_cast(tfm), |
| 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); |
| crypto_aead_set_reqsize(__crypto_aead_cast(tfm), |
| 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"); |