diff options
Diffstat (limited to 'crypto/akcipher.c')
| -rw-r--r-- | crypto/akcipher.c | 128 |
1 files changed, 109 insertions, 19 deletions
diff --git a/crypto/akcipher.c b/crypto/akcipher.c index ab975a420e1e..a36f50c83827 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -5,23 +5,36 @@ * 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 <linux/crypto.h> -#include <linux/compiler.h> -#include <crypto/algapi.h> -#include <linux/cryptouser.h> #include <net/netlink.h> -#include <crypto/akcipher.h> -#include <crypto/internal/akcipher.h> + #include "internal.h" -#ifdef CONFIG_NET -static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) +#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; @@ -32,12 +45,6 @@ static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(rakcipher), &rakcipher); } -#else -static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) -{ - return -ENOSYS; -} -#endif static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) __maybe_unused; @@ -83,11 +90,14 @@ static const struct crypto_type crypto_akcipher_type = { #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_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, @@ -130,10 +140,6 @@ int crypto_register_akcipher(struct akcipher_alg *alg) { struct crypto_alg *base = &alg->base; - if (!alg->sign) - alg->sign = akcipher_default_op; - if (!alg->verify) - alg->verify = akcipher_default_op; if (!alg->encrypt) alg->encrypt = akcipher_default_op; if (!alg->decrypt) @@ -162,5 +168,89 @@ int akcipher_register_instance(struct crypto_template *tmpl, } 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"); |