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Diffstat (limited to 'crypto/rsa-pkcs1pad.c')
-rw-r--r--crypto/rsa-pkcs1pad.c112
1 files changed, 45 insertions, 67 deletions
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index ebd851474a9d..8ccfdd7c926e 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -185,37 +185,36 @@ static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
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);
- size_t pad_len = ctx->key_size - req_ctx->child_req.dst_len;
- size_t chunk_len, pad_left;
- struct sg_mapping_iter miter;
-
- if (!err) {
- if (pad_len) {
- sg_miter_start(&miter, req->dst,
- sg_nents_for_len(req->dst, pad_len),
- SG_MITER_ATOMIC | SG_MITER_TO_SG);
-
- pad_left = pad_len;
- while (pad_left) {
- sg_miter_next(&miter);
-
- chunk_len = min(miter.length, pad_left);
- memset(miter.addr, 0, chunk_len);
- pad_left -= chunk_len;
- }
-
- sg_miter_stop(&miter);
- }
-
- sg_pcopy_from_buffer(req->dst,
- sg_nents_for_len(req->dst, ctx->key_size),
- req_ctx->out_buf, req_ctx->child_req.dst_len,
- pad_len);
- }
+ unsigned int pad_len;
+ unsigned int len;
+ u8 *out_buf;
+
+ if (err)
+ goto out;
+
+ len = req_ctx->child_req.dst_len;
+ pad_len = ctx->key_size - len;
+
+ /* Four billion to one */
+ if (likely(!pad_len))
+ goto out;
+
+ out_buf = kzalloc(ctx->key_size, GFP_ATOMIC);
+ err = -ENOMEM;
+ if (!out_buf)
+ goto out;
+
+ sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
+ out_buf + pad_len, len);
+ sg_copy_from_buffer(req->dst,
+ sg_nents_for_len(req->dst, ctx->key_size),
+ out_buf, ctx->key_size);
+ kzfree(out_buf);
+
+out:
req->dst_len = ctx->key_size;
kfree(req_ctx->in_buf);
- kzfree(req_ctx->out_buf);
return err;
}
@@ -255,15 +254,6 @@ static int pkcs1pad_encrypt(struct akcipher_request *req)
return -EOVERFLOW;
}
- /*
- * Replace both input and output to add the padding in the input and
- * the potential missing leading zeros in the output.
- */
- req_ctx->child_req.src = req_ctx->in_sg;
- req_ctx->child_req.src_len = ctx->key_size - 1;
- req_ctx->child_req.dst = req_ctx->out_sg;
- req_ctx->child_req.dst_len = ctx->key_size;
-
req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
GFP_KERNEL);
if (!req_ctx->in_buf)
@@ -291,6 +281,10 @@ static int pkcs1pad_encrypt(struct akcipher_request *req)
akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
pkcs1pad_encrypt_sign_complete_cb, req);
+ /* Reuse output buffer */
+ akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
+ req->dst, ctx->key_size - 1, req->dst_len);
+
err = crypto_akcipher_encrypt(&req_ctx->child_req);
if (err != -EINPROGRESS &&
(err != -EBUSY ||
@@ -372,12 +366,6 @@ static int pkcs1pad_decrypt(struct akcipher_request *req)
if (!ctx->key_size || req->src_len != ctx->key_size)
return -EINVAL;
- /* 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 ;
-
req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
if (!req_ctx->out_buf)
return -ENOMEM;
@@ -389,6 +377,11 @@ static int pkcs1pad_decrypt(struct akcipher_request *req)
akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
pkcs1pad_decrypt_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_decrypt(&req_ctx->child_req);
if (err != -EINPROGRESS &&
(err != -EBUSY ||
@@ -422,15 +415,6 @@ static int pkcs1pad_sign(struct akcipher_request *req)
return -EOVERFLOW;
}
- /*
- * Replace both input and output to add the padding in the input and
- * the potential missing leading zeros in the output.
- */
- req_ctx->child_req.src = req_ctx->in_sg;
- req_ctx->child_req.src_len = ctx->key_size - 1;
- req_ctx->child_req.dst = req_ctx->out_sg;
- req_ctx->child_req.dst_len = ctx->key_size;
-
req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
GFP_KERNEL);
if (!req_ctx->in_buf)
@@ -447,19 +431,14 @@ static int pkcs1pad_sign(struct akcipher_request *req)
pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
ctx->key_size - 1 - req->src_len, req->src);
- req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
- if (!req_ctx->out_buf) {
- kfree(req_ctx->in_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_encrypt_sign_complete_cb, req);
+ /* Reuse output buffer */
+ akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
+ req->dst, ctx->key_size - 1, req->dst_len);
+
err = crypto_akcipher_sign(&req_ctx->child_req);
if (err != -EINPROGRESS &&
(err != -EBUSY ||
@@ -559,12 +538,6 @@ static int pkcs1pad_verify(struct akcipher_request *req)
if (!ctx->key_size || req->src_len < ctx->key_size)
return -EINVAL;
- /* 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;
-
req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
if (!req_ctx->out_buf)
return -ENOMEM;
@@ -576,6 +549,11 @@ static int pkcs1pad_verify(struct akcipher_request *req)
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 ||
generated by cgit (git 2.34.1) at 2024-05-18 15:13:16 +0000