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crypto: rsa - only require output buffers as big as needed. 

rhe RSA operations explicitly left-align the integers being written
skipping any leading zero bytes, but still require the output buffers to
include just enough space for the integer + the leading zero bytes.
Since the size of integer + the leading zero bytes (i.e. the key modulus
size) can now be obtained more easily through crypto_akcipher_maxsize
change the operations to only require as big a buffer as actually needed
if the caller has that information.  The semantics for request->dst_len
don't change.

Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Andrzej Zaborowski 2015-11-13 12:01:33 +01:00 committed by Herbert Xu
parent 9cbe21d8f8
commit 457e6f73a1
1 changed files with 0 additions and 24 deletions
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24
crypto/rsa.c
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@ -91,12 +91,6 @@ static int rsa_enc(struct akcipher_request *req)
goto err_free_c;
}
if (req->dst_len < mpi_get_size(pkey->n)) {
req->dst_len = mpi_get_size(pkey->n);
ret = -EOVERFLOW;
goto err_free_c;
}
ret = -ENOMEM;
m = mpi_read_raw_from_sgl(req->src, req->src_len);
if (!m)
@ -136,12 +130,6 @@ static int rsa_dec(struct akcipher_request *req)
goto err_free_m;
}
if (req->dst_len < mpi_get_size(pkey->n)) {
req->dst_len = mpi_get_size(pkey->n);
ret = -EOVERFLOW;
goto err_free_m;
}
ret = -ENOMEM;
c = mpi_read_raw_from_sgl(req->src, req->src_len);
if (!c)
@ -180,12 +168,6 @@ static int rsa_sign(struct akcipher_request *req)
goto err_free_s;
}
if (req->dst_len < mpi_get_size(pkey->n)) {
req->dst_len = mpi_get_size(pkey->n);
ret = -EOVERFLOW;
goto err_free_s;
}
ret = -ENOMEM;
m = mpi_read_raw_from_sgl(req->src, req->src_len);
if (!m)
@ -225,12 +207,6 @@ static int rsa_verify(struct akcipher_request *req)
goto err_free_m;
}
if (req->dst_len < mpi_get_size(pkey->n)) {
req->dst_len = mpi_get_size(pkey->n);
ret = -EOVERFLOW;
goto err_free_m;
}
ret = -ENOMEM;
s = mpi_read_raw_from_sgl(req->src, req->src_len);
if (!s) {