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-rw-r--r--crypto/asymmetric_keys/public_key.c82
1 files changed, 81 insertions, 1 deletions
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index f2dc27897319..f5d85b47fcc6 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -130,7 +130,11 @@ static int software_key_query(const struct kernel_pkey_params *params,
info->max_sig_size = len;
info->max_enc_size = len;
info->max_dec_size = len;
- info->supported_ops = KEYCTL_SUPPORTS_VERIFY;
+ info->supported_ops = (KEYCTL_SUPPORTS_ENCRYPT |
+ KEYCTL_SUPPORTS_VERIFY);
+ if (pkey->key_is_private)
+ info->supported_ops |= (KEYCTL_SUPPORTS_DECRYPT |
+ KEYCTL_SUPPORTS_SIGN);
ret = 0;
error_free_tfm:
@@ -140,6 +144,81 @@ error_free_tfm:
}
/*
+ * Do encryption, decryption and signing ops.
+ */
+static int software_key_eds_op(struct kernel_pkey_params *params,
+ const void *in, void *out)
+{
+ const struct public_key *pkey = params->key->payload.data[asym_crypto];
+ struct akcipher_request *req;
+ struct crypto_akcipher *tfm;
+ struct crypto_wait cwait;
+ struct scatterlist in_sg, out_sg;
+ char alg_name[CRYPTO_MAX_ALG_NAME];
+ int ret;
+
+ pr_devel("==>%s()\n", __func__);
+
+ ret = software_key_determine_akcipher(params->encoding,
+ params->hash_algo,
+ pkey, alg_name);
+ if (ret < 0)
+ return ret;
+
+ tfm = crypto_alloc_akcipher(alg_name, 0, 0);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ req = akcipher_request_alloc(tfm, GFP_KERNEL);
+ if (!req)
+ goto error_free_tfm;
+
+ if (pkey->key_is_private)
+ ret = crypto_akcipher_set_priv_key(tfm,
+ pkey->key, pkey->keylen);
+ else
+ ret = crypto_akcipher_set_pub_key(tfm,
+ pkey->key, pkey->keylen);
+ if (ret)
+ goto error_free_req;
+
+ sg_init_one(&in_sg, in, params->in_len);
+ sg_init_one(&out_sg, out, params->out_len);
+ akcipher_request_set_crypt(req, &in_sg, &out_sg, params->in_len,
+ params->out_len);
+ crypto_init_wait(&cwait);
+ akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+ CRYPTO_TFM_REQ_MAY_SLEEP,
+ crypto_req_done, &cwait);
+
+ /* Perform the encryption calculation. */
+ switch (params->op) {
+ case kernel_pkey_encrypt:
+ ret = crypto_akcipher_encrypt(req);
+ break;
+ case kernel_pkey_decrypt:
+ ret = crypto_akcipher_decrypt(req);
+ break;
+ case kernel_pkey_sign:
+ ret = crypto_akcipher_sign(req);
+ break;
+ default:
+ BUG();
+ }
+
+ ret = crypto_wait_req(ret, &cwait);
+ if (ret == 0)
+ ret = req->dst_len;
+
+error_free_req:
+ akcipher_request_free(req);
+error_free_tfm:
+ crypto_free_akcipher(tfm);
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
+}
+
+/*
* Verify a signature using a public key.
*/
int public_key_verify_signature(const struct public_key *pkey,
@@ -242,6 +321,7 @@ struct asymmetric_key_subtype public_key_subtype = {
.describe = public_key_describe,
.destroy = public_key_destroy,
.query = software_key_query,
+ .eds_op = software_key_eds_op,
.verify_signature = public_key_verify_signature_2,
};
EXPORT_SYMBOL_GPL(public_key_subtype);