// SPDX-License-Identifier: GPL-2.0-or-later/* * Public Key Encryption * * Copyright (c) 2015, Intel Corporation * Authors: Tadeusz Struk <tadeusz.struk@intel.com> */#include <crypto/internal/akcipher.h>#include <linux/cryptouser.h>#include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/scatterlist.h>#include <linux/seq_file.h>#include <linux/slab.h>#include <linux/string.h>#include <net/netlink.h> #include "internal.h" #define CRYPTO_ALG_TYPE_AHASH_MASK	0x0000000e struct crypto_akcipher_sync_data {	struct crypto_akcipher *tfm;	const void *src;	void *dst;	unsigned int slen;	unsigned int dlen; 	struct akcipher_request *req;	struct crypto_wait cwait;	struct scatterlist sg;	u8 *buf;}; static int __maybe_unused crypto_akcipher_report(	struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_akcipher rakcipher = {		.type = "akcipher",	}; 	return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,		       sizeof(rakcipher), &rakcipher);} static void __maybe_unused crypto_akcipher_show(struct seq_file *m,						struct crypto_alg *alg){	seq_puts(m, "type         : akcipher\n");} static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm){	struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);	struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 	alg->exit(akcipher);} static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm){	struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);	struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 	if (alg->exit)		akcipher->base.exit = crypto_akcipher_exit_tfm; 	if (alg->init)		return alg->init(akcipher); 	return 0;} static void crypto_akcipher_free_instance(struct crypto_instance *inst){	struct akcipher_instance *akcipher = akcipher_instance(inst); 	akcipher->free(akcipher);} static const struct crypto_type crypto_akcipher_type = {	.extsize = crypto_alg_extsize,	.init_tfm = crypto_akcipher_init_tfm,	.free = crypto_akcipher_free_instance,#ifdef CONFIG_PROC_FS	.show = crypto_akcipher_show,#endif#if IS_ENABLED(CONFIG_CRYPTO_USER)	.report = crypto_akcipher_report,#endif	.maskclear = ~CRYPTO_ALG_TYPE_MASK,	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,	.type = CRYPTO_ALG_TYPE_AKCIPHER,	.tfmsize = offsetof(struct crypto_akcipher, base),	.algsize = offsetof(struct akcipher_alg, base),}; int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,			 struct crypto_instance *inst,			 const char *name, u32 type, u32 mask){	spawn->base.frontend = &crypto_akcipher_type;	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);}EXPORT_SYMBOL_GPL(crypto_grab_akcipher); struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,					      u32 mask){	return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);}EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); static void akcipher_prepare_alg(struct akcipher_alg *alg){	struct crypto_alg *base = &alg->base; 	base->cra_type = &crypto_akcipher_type;	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;	base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;} static int akcipher_default_op(struct akcipher_request *req){	return -ENOSYS;} static int akcipher_default_set_key(struct crypto_akcipher *tfm,				     const void *key, unsigned int keylen){	return -ENOSYS;} int crypto_register_akcipher(struct akcipher_alg *alg){	struct crypto_alg *base = &alg->base; 	if (!alg->encrypt)		alg->encrypt = akcipher_default_op;	if (!alg->decrypt)		alg->decrypt = akcipher_default_op;	if (!alg->set_priv_key)		alg->set_priv_key = akcipher_default_set_key; 	akcipher_prepare_alg(alg);	return crypto_register_alg(base);}EXPORT_SYMBOL_GPL(crypto_register_akcipher); void crypto_unregister_akcipher(struct akcipher_alg *alg){	crypto_unregister_alg(&alg->base);}EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); int akcipher_register_instance(struct crypto_template *tmpl,			       struct akcipher_instance *inst){	if (WARN_ON(!inst->free))		return -EINVAL;	akcipher_prepare_alg(&inst->alg);	return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));}EXPORT_SYMBOL_GPL(akcipher_register_instance); static int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data){	unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);	struct akcipher_request *req;	struct scatterlist *sg;	unsigned int mlen;	unsigned int len;	u8 *buf; 	mlen = max(data->slen, data->dlen); 	len = sizeof(*req) + reqsize + mlen;	if (len < mlen)		return -EOVERFLOW; 	req = kzalloc(len, GFP_KERNEL);	if (!req)		return -ENOMEM; 	data->req = req;	akcipher_request_set_tfm(req, data->tfm); 	buf = (u8 *)(req + 1) + reqsize;	data->buf = buf;	memcpy(buf, data->src, data->slen); 	sg = &data->sg;	sg_init_one(sg, buf, mlen);	akcipher_request_set_crypt(req, sg, sg, data->slen, data->dlen); 	crypto_init_wait(&data->cwait);	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,				      crypto_req_done, &data->cwait); 	return 0;} static int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data,				     int err){	err = crypto_wait_req(err, &data->cwait);	memcpy(data->dst, data->buf, data->dlen);	data->dlen = data->req->dst_len;	kfree_sensitive(data->req);	return err;} int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm,				 const void *src, unsigned int slen,				 void *dst, unsigned int dlen){	struct crypto_akcipher_sync_data data = {		.tfm = tfm,		.src = src,		.dst = dst,		.slen = slen,		.dlen = dlen,	}; 	return crypto_akcipher_sync_prep(&data) ?:	       crypto_akcipher_sync_post(&data,					 crypto_akcipher_encrypt(data.req));}EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt); int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm,				 const void *src, unsigned int slen,				 void *dst, unsigned int dlen){	struct crypto_akcipher_sync_data data = {		.tfm = tfm,		.src = src,		.dst = dst,		.slen = slen,		.dlen = dlen,	}; 	return crypto_akcipher_sync_prep(&data) ?:	       crypto_akcipher_sync_post(&data,					 crypto_akcipher_decrypt(data.req)) ?:	       data.dlen;}EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Generic public key cipher type");