From aed1c9a20e0d09f21ce36f8b704c77d7dfa1d26d Mon Sep 17 00:00:00 2001 From: Raymond Mao Date: Thu, 3 Oct 2024 14:50:27 -0700 Subject: pkcs7: move common functions to PKCS7 helper Move pkcs7_get_content_data as a helper function that can be shared by legacy crypto lib and MbedTLS implementation. Signed-off-by: Raymond Mao Reviewed-by: Ilias Apalodimas --- lib/crypto/pkcs7_helper.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 lib/crypto/pkcs7_helper.c (limited to 'lib/crypto/pkcs7_helper.c') diff --git a/lib/crypto/pkcs7_helper.c b/lib/crypto/pkcs7_helper.c new file mode 100644 index 00000000000..bb3b9d1354f --- /dev/null +++ b/lib/crypto/pkcs7_helper.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * PKCS7 helper functions + * + * Copyright (c) 2012 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ +#include +#include +#include + +/** + * pkcs7_get_content_data - Get access to the PKCS#7 content + * @pkcs7: The preparsed PKCS#7 message to access + * @_data: Place to return a pointer to the data + * @_data_len: Place to return the data length + * @_headerlen: Size of ASN.1 header not included in _data + * + * Get access to the data content of the PKCS#7 message. The size of the + * header of the ASN.1 object that contains it is also provided and can be used + * to adjust *_data and *_data_len to get the entire object. + * + * Returns -ENODATA if the data object was missing from the message. + */ +int pkcs7_get_content_data(const struct pkcs7_message *pkcs7, + const void **_data, size_t *_data_len, + size_t *_headerlen) +{ + if (!pkcs7->data) + return -ENODATA; + + *_data = pkcs7->data; + *_data_len = pkcs7->data_len; + if (_headerlen) + *_headerlen = pkcs7->data_hdrlen; + return 0; +} -- cgit v1.2.3