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crypto: rsa-pkcs1pad - Move key size check to setkey 

Rather than repeatedly checking the key size on each operation,
we should be checking it once when the key is set.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-06-29 19:32:27 +08:00
parent 3a32ce507a
commit 73f7918960
1 changed files with 26 additions and 30 deletions
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56
crypto/rsa-pkcs1pad.c
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@ -111,40 +111,48 @@ static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
unsigned int keylen)
{
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
int err, size;
int err;
ctx->key_size = 0;
err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
if (err)
return err;
if (!err) {
/* Find out new modulus size from rsa implementation */
size = crypto_akcipher_maxsize(ctx->child);
/* Find out new modulus size from rsa implementation */
err = crypto_akcipher_maxsize(ctx->child);
if (err < 0)
return err;
ctx->key_size = size > 0 ? size : 0;
if (size <= 0)
err = size;
}
if (err > PAGE_SIZE)
return -ENOTSUPP;
return err;
ctx->key_size = err;
return 0;
}
static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
unsigned int keylen)
{
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
int err, size;
int err;
ctx->key_size = 0;
err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
if (err)
return err;
if (!err) {
/* Find out new modulus size from rsa implementation */
size = crypto_akcipher_maxsize(ctx->child);
/* Find out new modulus size from rsa implementation */
err = crypto_akcipher_maxsize(ctx->child);
if (err < 0)
return err;
ctx->key_size = size > 0 ? size : 0;
if (size <= 0)
err = size;
}
if (err > PAGE_SIZE)
return -ENOTSUPP;
return err;
ctx->key_size = err;
return 0;
}
static int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
@ -247,9 +255,6 @@ static int pkcs1pad_encrypt(struct akcipher_request *req)
return -EOVERFLOW;
}
if (ctx->key_size > PAGE_SIZE)
return -ENOTSUPP;
/*
* Replace both input and output to add the padding in the input and
* the potential missing leading zeros in the output.
@ -367,9 +372,6 @@ static int pkcs1pad_decrypt(struct akcipher_request *req)
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;
@ -420,9 +422,6 @@ static int pkcs1pad_sign(struct akcipher_request *req)
return -EOVERFLOW;
}
if (ctx->key_size > PAGE_SIZE)
return -ENOTSUPP;
/*
* Replace both input and output to add the padding in the input and
* the potential missing leading zeros in the output.
@ -560,9 +559,6 @@ static int pkcs1pad_verify(struct akcipher_request *req)
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;