diff options
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/akcipher.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/crypto/akcipher.c b/crypto/akcipher.c index 7960ceb528c36..2d10b58c40103 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -10,6 +10,7 @@ #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> @@ -17,6 +18,19 @@ #include "internal.h" +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) { @@ -186,5 +200,86 @@ 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); + unsigned int mlen = max(data->slen, data->dlen); + struct akcipher_request *req; + struct scatterlist *sg; + unsigned int len; + u8 *buf; + + len = sizeof(*req) + reqsize + mlen; + if (len < mlen) + return -EOVERFLOW; + + req = kzalloc(len, GFP_KERNEL); + if (!req) + return -ENOMEM; + + data->req = req; + + 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"); |