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 --- Changes in v4 - Initial patch.
lib/crypto/Makefile | 1 + lib/crypto/pkcs7_helper.c | 40 +++++++++++++++++++++++++++++++++++++++ lib/crypto/pkcs7_parser.c | 28 --------------------------- 3 files changed, 41 insertions(+), 28 deletions(-) create mode 100644 lib/crypto/pkcs7_helper.c
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile index 946cc3a7b59..16059088f26 100644 --- a/lib/crypto/Makefile +++ b/lib/crypto/Makefile @@ -53,6 +53,7 @@ $(obj)/x509_akid.asn1.o: $(obj)/x509_akid.asn1.c $(obj)/x509_akid.asn1.h obj-$(CONFIG_$(SPL_)PKCS7_MESSAGE_PARSER) += pkcs7_message.o pkcs7_message-y := \ pkcs7.asn1.o \ + pkcs7_helper.o \ pkcs7_parser.o obj-$(CONFIG_$(SPL_)PKCS7_VERIFY) += pkcs7_verify.o
diff --git a/lib/crypto/pkcs7_helper.c b/lib/crypto/pkcs7_helper.c new file mode 100644 index 00000000000..6c8dcd1a935 --- /dev/null +++ b/lib/crypto/pkcs7_helper.c @@ -0,0 +1,40 @@ +// 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) + * + * Copyright (c) 2024 Linaro Limited + * Author: Raymond Mao raymond.mao@linaro.org + */ +#include <linux/kernel.h> +#include <linux/err.h> +#include <crypto/pkcs7_parser.h> + +/** + * 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; +} diff --git a/lib/crypto/pkcs7_parser.c b/lib/crypto/pkcs7_parser.c index d5efa828d6a..c849dc0d92d 100644 --- a/lib/crypto/pkcs7_parser.c +++ b/lib/crypto/pkcs7_parser.c @@ -182,34 +182,6 @@ out_no_ctx: } EXPORT_SYMBOL_GPL(pkcs7_parse_message);
-/** - * 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; -} -EXPORT_SYMBOL_GPL(pkcs7_get_content_data); - /* * Note an OID when we find one for later processing when we know how * to interpret it.