/*
* The verify operation is here for completeness similar to the verification
* defined in RFC2313 section 10.2 except that block type 0 is not accepted,
* as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
* retrieve the DigestInfo from a signature, instead the user is expected
* to call the sign operation to generate the expected signature and compare
* signatures instead of the message-digests.
*/
static int pkcs1pad_verify(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
int err;
if (!ctx->key_size || req->src_len < ctx->key_size)
return -EINVAL;
req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
if (!req_ctx->out_buf)
return -ENOMEM;
pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
ctx->key_size, NULL);
akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
pkcs1pad_verify_complete_cb, req);
/* Reuse input buffer, output to a new buffer */
akcipher_request_set_crypt(&req_ctx->child_req, req->src,
req_ctx->out_sg, req->src_len,
ctx->key_size);
err = crypto_akcipher_verify(&req_ctx->child_req);
if (err != -EINPROGRESS && err != -EBUSY)
return pkcs1pad_verify_complete(req, err);
return err;
}
static void pkcs1pad_verify_complete_cb(
struct crypto_async_request *child_async_req, int err)
{
struct akcipher_request *req = child_async_req->data;
struct crypto_async_request async_req;
if (err == -EINPROGRESS)
return;
async_req.data = req->base.data;
async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
async_req.flags = child_async_req->flags;
req->base.complete(&async_req, pkcs1pad_verify_complete(req, err));
}
/*
* The verify operation is here for completeness similar to the verification
* defined in RFC2313 section 10.2 except that block type 0 is not accepted,
* as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
* retrieve the DigestInfo from a signature, instead the user is expected
* to call the sign operation to generate the expected signature and compare
* signatures instead of the message-digests.
*/
static int pkcs1pad_verify(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
int err;
if (!ctx->key_size || req->src_len < ctx->key_size)
return -EINVAL;
if (ctx->key_size > PAGE_SIZE)
return -ENOTSUPP;
/* Reuse input buffer, output to a new buffer */
req_ctx->child_req.src = req->src;
req_ctx->child_req.src_len = req->src_len;
req_ctx->child_req.dst = req_ctx->out_sg;
req_ctx->child_req.dst_len = ctx->key_size - 1;
req_ctx->out_buf = kmalloc(ctx->key_size - 1,
(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
GFP_KERNEL : GFP_ATOMIC);
if (!req_ctx->out_buf)
return -ENOMEM;
pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
ctx->key_size - 1, NULL);
akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
pkcs1pad_verify_complete_cb, req);
err = crypto_akcipher_verify(&req_ctx->child_req);
if (err != -EINPROGRESS &&
(err != -EBUSY ||
!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
return pkcs1pad_verify_complete(req, err);
return err;
}