| /* |
| * 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/null.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_rfc4543_ctx { |
| struct crypto_aead *child; |
| struct crypto_blkcipher *null; |
| u8 nonce[4]; |
| }; |
| |
| struct crypto_rfc4543_req_ctx { |
| struct aead_request subreq; |
| }; |
| |
| struct crypto_gcm_ghash_ctx { |
| unsigned int cryptlen; |
| struct scatterlist *src; |
| int (*complete)(struct aead_request *req, u32 flags); |
| }; |
| |
| struct crypto_gcm_req_priv_ctx { |
| u8 iv[16]; |
| u8 auth_tag[16]; |
| u8 iauth_tag[16]; |
| struct scatterlist src[3]; |
| struct scatterlist dst[3]; |
| struct scatterlist sg; |
| struct crypto_gcm_ghash_ctx ghash_ctx; |
| union { |
| struct ahash_request ahreq; |
| struct ablkcipher_request abreq; |
| } u; |
| }; |
| |
| struct crypto_gcm_setkey_result { |
| int err; |
| struct completion completion; |
| }; |
| |
| static struct { |
| u8 buf[16]; |
| struct scatterlist sg; |
| } *gcm_zeroes; |
| |
| static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); |
| |
| 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); |
| crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & |
| CRYPTO_TFM_RES_MASK); |
| if (err) |
| return err; |
| |
| 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: |
| kzfree(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_common(struct aead_request *req) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| __be32 counter = cpu_to_be32(1); |
| struct scatterlist *sg; |
| |
| memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); |
| memcpy(pctx->iv, req->iv, 12); |
| memcpy(pctx->iv + 12, &counter, 4); |
| |
| sg_init_table(pctx->src, 3); |
| sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
| sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
| if (sg != pctx->src + 1) |
| scatterwalk_sg_chain(pctx->src, 2, sg); |
| |
| if (req->src != req->dst) { |
| sg_init_table(pctx->dst, 3); |
| sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
| sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
| if (sg != pctx->dst + 1) |
| scatterwalk_sg_chain(pctx->dst, 2, sg); |
| } |
| } |
| |
| static void crypto_gcm_init_crypt(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 ablkcipher_request *ablk_req = &pctx->u.abreq; |
| struct scatterlist *dst; |
| |
| dst = req->src == req->dst ? pctx->src : pctx->dst; |
| |
| ablkcipher_request_set_tfm(ablk_req, ctx->ctr); |
| ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
| cryptlen + sizeof(pctx->auth_tag), |
| pctx->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 int gcm_hash_update(struct aead_request *req, |
| crypto_completion_t compl, |
| struct scatterlist *src, |
| unsigned int len, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct ahash_request *ahreq = &pctx->u.ahreq; |
| |
| ahash_request_set_callback(ahreq, flags, compl, req); |
| ahash_request_set_crypt(ahreq, src, NULL, len); |
| |
| return crypto_ahash_update(ahreq); |
| } |
| |
| static int gcm_hash_remain(struct aead_request *req, |
| unsigned int remain, |
| crypto_completion_t compl, u32 flags) |
| { |
| return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
| } |
| |
| static int gcm_hash_len(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct ahash_request *ahreq = &pctx->u.ahreq; |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 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->sg, pctx->iauth_tag, 16); |
| ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); |
| ahash_request_set_crypt(ahreq, &pctx->sg, |
| pctx->iauth_tag, sizeof(lengths)); |
| |
| return crypto_ahash_finup(ahreq); |
| } |
| |
| static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| |
| return gctx->complete(req, flags); |
| } |
| |
| static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_hash_len_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
| { |
| return gcm_hash_len(req, flags) ?: |
| gcm_hash_len_continue(req, flags); |
| } |
| |
| static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
| int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_hash_crypt_remain_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| unsigned int remain; |
| |
| remain = gcm_remain(gctx->cryptlen); |
| if (remain) |
| return gcm_hash_remain(req, remain, |
| gcm_hash_crypt_remain_done, flags) ?: |
| gcm_hash_crypt_remain_continue(req, flags); |
| |
| return gcm_hash_crypt_remain_continue(req, flags); |
| } |
| |
| static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_hash_crypt_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| |
| if (gctx->cryptlen) |
| return gcm_hash_update(req, gcm_hash_crypt_done, |
| gctx->src, gctx->cryptlen, flags) ?: |
| gcm_hash_crypt_continue(req, flags); |
| |
| return gcm_hash_crypt_remain_continue(req, flags); |
| } |
| |
| static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
| int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_hash_assoc_remain_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
| { |
| unsigned int remain; |
| |
| remain = gcm_remain(req->assoclen); |
| if (remain) |
| return gcm_hash_remain(req, remain, |
| gcm_hash_assoc_remain_done, flags) ?: |
| gcm_hash_assoc_remain_continue(req, flags); |
| |
| return gcm_hash_assoc_remain_continue(req, flags); |
| } |
| |
| static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_hash_assoc_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
| { |
| if (req->assoclen) |
| return gcm_hash_update(req, gcm_hash_assoc_done, |
| req->src, req->assoclen, flags) ?: |
| gcm_hash_assoc_continue(req, flags); |
| |
| return gcm_hash_assoc_remain_continue(req, flags); |
| } |
| |
| static void gcm_hash_init_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_hash_init_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_hash(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct ahash_request *ahreq = &pctx->u.ahreq; |
| struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| |
| ahash_request_set_tfm(ahreq, ctx->ghash); |
| |
| ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
| return crypto_ahash_init(ahreq) ?: |
| gcm_hash_init_continue(req, flags); |
| } |
| |
| static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| u8 *auth_tag = pctx->auth_tag; |
| |
| crypto_xor(auth_tag, pctx->iauth_tag, 16); |
| scatterwalk_map_and_copy(auth_tag, req->dst, |
| req->assoclen + req->cryptlen, |
| crypto_aead_authsize(aead), 1); |
| return 0; |
| } |
| |
| static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| |
| gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
| gctx->cryptlen = req->cryptlen; |
| gctx->complete = gcm_enc_copy_hash; |
| |
| return gcm_hash(req, flags); |
| } |
| |
| static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| |
| if (err) |
| goto out; |
| |
| err = gcm_encrypt_continue(req, 0); |
| if (err == -EINPROGRESS) |
| return; |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static int crypto_gcm_encrypt(struct aead_request *req) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct ablkcipher_request *abreq = &pctx->u.abreq; |
| u32 flags = aead_request_flags(req); |
| |
| crypto_gcm_init_common(req); |
| crypto_gcm_init_crypt(req, req->cryptlen); |
| ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req); |
| |
| return crypto_ablkcipher_encrypt(abreq) ?: |
| gcm_encrypt_continue(req, flags); |
| } |
| |
| static int crypto_gcm_verify(struct aead_request *req) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| u8 *auth_tag = pctx->auth_tag; |
| 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, |
| req->assoclen + 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; |
| |
| if (!err) |
| err = crypto_gcm_verify(req); |
| |
| aead_request_complete(req, err); |
| } |
| |
| static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
| { |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct ablkcipher_request *abreq = &pctx->u.abreq; |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| |
| crypto_gcm_init_crypt(req, gctx->cryptlen); |
| ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req); |
| return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req); |
| } |
| |
| static int crypto_gcm_decrypt(struct aead_request *req) |
| { |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| unsigned int authsize = crypto_aead_authsize(aead); |
| unsigned int cryptlen = req->cryptlen; |
| u32 flags = aead_request_flags(req); |
| |
| cryptlen -= authsize; |
| |
| crypto_gcm_init_common(req); |
| |
| gctx->src = sg_next(pctx->src); |
| gctx->cryptlen = cryptlen; |
| gctx->complete = gcm_dec_hash_continue; |
| |
| return gcm_hash(req, flags); |
| } |
| |
| static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
| { |
| struct aead_instance *inst = aead_alg_instance(tfm); |
| struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); |
| struct crypto_gcm_ctx *ctx = crypto_aead_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_aead_alignmask(tfm); |
| align &= ~(crypto_tfm_ctx_alignment() - 1); |
| crypto_aead_set_reqsize(tfm, |
| align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
| max(sizeof(struct 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_aead *tfm) |
| { |
| struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| crypto_free_ahash(ctx->ghash); |
| crypto_free_ablkcipher(ctx->ctr); |
| } |
| |
| static int crypto_gcm_create_common(struct crypto_template *tmpl, |
| struct rtattr **tb, |
| const char *full_name, |
| const char *ctr_name, |
| const char *ghash_name) |
| { |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct crypto_alg *ctr; |
| struct crypto_alg *ghash_alg; |
| struct hash_alg_common *ghash; |
| struct gcm_instance_ctx *ctx; |
| int err; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return PTR_ERR(algt); |
| |
| if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| return -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 PTR_ERR(ghash_alg); |
| |
| ghash = __crypto_hash_alg_common(ghash_alg); |
| |
| err = -ENOMEM; |
| inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| if (!inst) |
| goto out_put_ghash; |
| |
| ctx = aead_instance_ctx(inst); |
| err = crypto_init_ahash_spawn(&ctx->ghash, ghash, |
| aead_crypto_instance(inst)); |
| if (err) |
| goto err_free_inst; |
| |
| err = -EINVAL; |
| if (ghash->digestsize != 16) |
| goto err_drop_ghash; |
| |
| crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(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.base.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.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
| |
| inst->alg.base.cra_flags = (ghash->base.cra_flags | ctr->cra_flags) & |
| CRYPTO_ALG_ASYNC; |
| inst->alg.base.cra_priority = (ghash->base.cra_priority + |
| ctr->cra_priority) / 2; |
| inst->alg.base.cra_blocksize = 1; |
| inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | |
| ctr->cra_alignmask; |
| inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
| inst->alg.ivsize = 12; |
| inst->alg.maxauthsize = 16; |
| inst->alg.init = crypto_gcm_init_tfm; |
| inst->alg.exit = crypto_gcm_exit_tfm; |
| inst->alg.setkey = crypto_gcm_setkey; |
| inst->alg.setauthsize = crypto_gcm_setauthsize; |
| inst->alg.encrypt = crypto_gcm_encrypt; |
| inst->alg.decrypt = crypto_gcm_decrypt; |
| |
| err = aead_register_instance(tmpl, inst); |
| if (err) |
| goto out_put_ctr; |
| |
| out_put_ghash: |
| crypto_mod_put(ghash_alg); |
| return err; |
| |
| out_put_ctr: |
| crypto_drop_skcipher(&ctx->ctr); |
| err_drop_ghash: |
| crypto_drop_ahash(&ctx->ghash); |
| err_free_inst: |
| kfree(inst); |
| goto out_put_ghash; |
| } |
| |
| static int crypto_gcm_create(struct crypto_template *tmpl, 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 PTR_ERR(cipher_name); |
| |
| if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| return crypto_gcm_create_common(tmpl, 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(aead_instance(inst)); |
| } |
| |
| static struct crypto_template crypto_gcm_tmpl = { |
| .name = "gcm", |
| .create = crypto_gcm_create, |
| .free = crypto_gcm_free, |
| .module = THIS_MODULE, |
| }; |
| |
| static int crypto_gcm_base_create(struct crypto_template *tmpl, |
| 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 PTR_ERR(ctr_name); |
| |
| ghash_name = crypto_attr_alg_name(tb[2]); |
| if (IS_ERR(ghash_name)) |
| return PTR_ERR(ghash_name); |
| |
| if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", |
| ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| return crypto_gcm_create_common(tmpl, tb, full_name, |
| ctr_name, ghash_name); |
| } |
| |
| static struct crypto_template crypto_gcm_base_tmpl = { |
| .name = "gcm_base", |
| .create = crypto_gcm_base_create, |
| .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_ad(subreq, 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_aead *tfm) |
| { |
| struct aead_instance *inst = aead_alg_instance(tfm); |
| struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); |
| struct crypto_rfc4106_ctx *ctx = crypto_aead_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( |
| tfm, |
| sizeof(struct aead_request) + |
| ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
| align + 12); |
| |
| return 0; |
| } |
| |
| static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm) |
| { |
| struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| crypto_free_aead(ctx->child); |
| } |
| |
| static int crypto_rfc4106_create(struct crypto_template *tmpl, |
| struct rtattr **tb) |
| { |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct crypto_aead_spawn *spawn; |
| struct aead_alg *alg; |
| const char *ccm_name; |
| int err; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return PTR_ERR(algt); |
| |
| if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| return -EINVAL; |
| |
| ccm_name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(ccm_name)) |
| return PTR_ERR(ccm_name); |
| |
| inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| if (!inst) |
| return -ENOMEM; |
| |
| spawn = aead_instance_ctx(inst); |
| crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
| err = crypto_grab_aead(spawn, ccm_name, 0, |
| crypto_requires_sync(algt->type, algt->mask)); |
| if (err) |
| goto out_free_inst; |
| |
| alg = crypto_spawn_aead_alg(spawn); |
| |
| err = -EINVAL; |
| |
| /* Underlying IV size must be 12. */ |
| if (crypto_aead_alg_ivsize(alg) != 12) |
| goto out_drop_alg; |
| |
| /* Not a stream cipher? */ |
| if (alg->base.cra_blocksize != 1) |
| goto out_drop_alg; |
| |
| err = -ENAMETOOLONG; |
| if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| "rfc4106(%s)", alg->base.cra_name) >= |
| CRYPTO_MAX_ALG_NAME || |
| snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| "rfc4106(%s)", alg->base.cra_driver_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| goto out_drop_alg; |
| |
| inst->alg.base.cra_flags |= alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
| inst->alg.base.cra_priority = alg->base.cra_priority; |
| inst->alg.base.cra_blocksize = 1; |
| inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
| |
| inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
| |
| inst->alg.ivsize = 8; |
| inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
| |
| inst->alg.init = crypto_rfc4106_init_tfm; |
| inst->alg.exit = crypto_rfc4106_exit_tfm; |
| |
| inst->alg.setkey = crypto_rfc4106_setkey; |
| inst->alg.setauthsize = crypto_rfc4106_setauthsize; |
| inst->alg.encrypt = crypto_rfc4106_encrypt; |
| inst->alg.decrypt = crypto_rfc4106_decrypt; |
| |
| err = aead_register_instance(tmpl, inst); |
| if (err) |
| goto out_drop_alg; |
| |
| out: |
| return err; |
| |
| out_drop_alg: |
| crypto_drop_aead(spawn); |
| out_free_inst: |
| kfree(inst); |
| goto out; |
| } |
| |
| static void crypto_rfc4106_free(struct crypto_instance *inst) |
| { |
| crypto_drop_aead(crypto_instance_ctx(inst)); |
| kfree(aead_instance(inst)); |
| } |
| |
| static struct crypto_template crypto_rfc4106_tmpl = { |
| .name = "rfc4106", |
| .create = crypto_rfc4106_create, |
| .free = crypto_rfc4106_free, |
| .module = THIS_MODULE, |
| }; |
| |
| 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 int 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 = aead_request_ctx(req); |
| struct aead_request *subreq = &rctx->subreq; |
| unsigned int authsize = crypto_aead_authsize(aead); |
| u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
| crypto_aead_alignmask(ctx->child) + 1); |
| int err; |
| |
| if (req->src != req->dst) { |
| err = crypto_rfc4543_copy_src_to_dst(req, enc); |
| if (err) |
| return err; |
| } |
| |
| memcpy(iv, ctx->nonce, 4); |
| memcpy(iv + 4, req->iv, 8); |
| |
| aead_request_set_tfm(subreq, ctx->child); |
| aead_request_set_callback(subreq, req->base.flags, |
| req->base.complete, req->base.data); |
| aead_request_set_crypt(subreq, req->src, req->dst, |
| enc ? 0 : authsize, iv); |
| aead_request_set_ad(subreq, req->assoclen + req->cryptlen - |
| subreq->cryptlen); |
| |
| return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(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->assoclen + 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) |
| { |
| return crypto_rfc4543_crypt(req, true); |
| } |
| |
| static int crypto_rfc4543_decrypt(struct aead_request *req) |
| { |
| return crypto_rfc4543_crypt(req, false); |
| } |
| |
| static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
| { |
| struct aead_instance *inst = aead_alg_instance(tfm); |
| struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); |
| struct crypto_aead_spawn *spawn = &ictx->aead; |
| struct crypto_rfc4543_ctx *ctx = crypto_aead_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_get_default_null_skcipher(); |
| 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( |
| tfm, |
| sizeof(struct crypto_rfc4543_req_ctx) + |
| ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
| align + 12); |
| |
| return 0; |
| |
| err_free_aead: |
| crypto_free_aead(aead); |
| return err; |
| } |
| |
| static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
| { |
| struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| crypto_free_aead(ctx->child); |
| crypto_put_default_null_skcipher(); |
| } |
| |
| static int crypto_rfc4543_create(struct crypto_template *tmpl, |
| struct rtattr **tb) |
| { |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct crypto_aead_spawn *spawn; |
| struct aead_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 PTR_ERR(algt); |
| |
| if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| return -EINVAL; |
| |
| ccm_name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(ccm_name)) |
| return PTR_ERR(ccm_name); |
| |
| inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| if (!inst) |
| return -ENOMEM; |
| |
| ctx = aead_instance_ctx(inst); |
| spawn = &ctx->aead; |
| crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
| err = crypto_grab_aead(spawn, ccm_name, 0, |
| crypto_requires_sync(algt->type, algt->mask)); |
| if (err) |
| goto out_free_inst; |
| |
| alg = crypto_spawn_aead_alg(spawn); |
| |
| err = -EINVAL; |
| |
| /* Underlying IV size must be 12. */ |
| if (crypto_aead_alg_ivsize(alg) != 12) |
| goto out_drop_alg; |
| |
| /* Not a stream cipher? */ |
| if (alg->base.cra_blocksize != 1) |
| goto out_drop_alg; |
| |
| err = -ENAMETOOLONG; |
| if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| "rfc4543(%s)", alg->base.cra_name) >= |
| CRYPTO_MAX_ALG_NAME || |
| snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| "rfc4543(%s)", alg->base.cra_driver_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| goto out_drop_alg; |
| |
| inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
| inst->alg.base.cra_priority = alg->base.cra_priority; |
| inst->alg.base.cra_blocksize = 1; |
| inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
| |
| inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
| |
| inst->alg.ivsize = 8; |
| inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
| |
| inst->alg.init = crypto_rfc4543_init_tfm; |
| inst->alg.exit = crypto_rfc4543_exit_tfm; |
| |
| inst->alg.setkey = crypto_rfc4543_setkey; |
| inst->alg.setauthsize = crypto_rfc4543_setauthsize; |
| inst->alg.encrypt = crypto_rfc4543_encrypt; |
| inst->alg.decrypt = crypto_rfc4543_decrypt; |
| |
| err = aead_register_instance(tmpl, inst); |
| if (err) |
| goto out_drop_alg; |
| |
| out: |
| return err; |
| |
| out_drop_alg: |
| crypto_drop_aead(spawn); |
| out_free_inst: |
| kfree(inst); |
| 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); |
| |
| kfree(aead_instance(inst)); |
| } |
| |
| static struct crypto_template crypto_rfc4543_tmpl = { |
| .name = "rfc4543", |
| .create = crypto_rfc4543_create, |
| .free = crypto_rfc4543_free, |
| .module = THIS_MODULE, |
| }; |
| |
| static int __init crypto_gcm_module_init(void) |
| { |
| int err; |
| |
| gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
| if (!gcm_zeroes) |
| return -ENOMEM; |
| |
| sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
| |
| 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"); |