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aed1c9a20e
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 <raymond.mao@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PKCS7 helper functions
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*
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* Copyright (c) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <crypto/pkcs7_parser.h>
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/**
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* pkcs7_get_content_data - Get access to the PKCS#7 content
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* @pkcs7: The preparsed PKCS#7 message to access
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* @_data: Place to return a pointer to the data
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* @_data_len: Place to return the data length
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* @_headerlen: Size of ASN.1 header not included in _data
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*
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* Get access to the data content of the PKCS#7 message. The size of the
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* header of the ASN.1 object that contains it is also provided and can be used
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* to adjust *_data and *_data_len to get the entire object.
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*
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* Returns -ENODATA if the data object was missing from the message.
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*/
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int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
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const void **_data, size_t *_data_len,
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size_t *_headerlen)
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{
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if (!pkcs7->data)
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return -ENODATA;
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*_data = pkcs7->data;
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*_data_len = pkcs7->data_len;
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if (_headerlen)
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*_headerlen = pkcs7->data_hdrlen;
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return 0;
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}
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