[PATCH v7 25/27] asn1_decoder: add build options for ASN1 decoder

[Raymond Mao]

When building with MbedTLS, we are using MbedTLS to decode ASN1 data
for x509, pkcs7 and mscode.
Introduce _LEGACY and _MBEDTLS kconfigs for ASN1 decoder legacy and
MbedTLS implementations respectively.

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
Changes in v2
- Initial patch.
Changes in v3
- None.
Changes in v4
- Introduce _LEGACY and _MBEDTLS kconfigs for ASN1 decoder legacy and
  MbedTLS implementations respectively.
- Update the commit subject.
Changes in v5
- Correct kconfig dependence.
- Refactored MbedTLS makefile.
Changes in v6
- None.
Changes in v7
- None.

 lib/Makefile         |  2 +-
 lib/mbedtls/Kconfig  | 30 ++++++++++++++++++++++++++++++
 lib/mbedtls/Makefile |  2 +-
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/lib/Makefile b/lib/Makefile
index 33755778283..561e0d44a16 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -81,7 +81,7 @@ obj-$(CONFIG_$(SPL_)SHA256_LEGACY) += sha256.o
 obj-$(CONFIG_$(SPL_)SHA512_LEGACY) += sha512.o
 
 obj-$(CONFIG_CRYPT_PW) += crypt/
-obj-$(CONFIG_$(SPL_)ASN1_DECODER) += asn1_decoder.o
+obj-$(CONFIG_$(SPL_)ASN1_DECODER_LEGACY) += asn1_decoder.o
 
 obj-$(CONFIG_$(SPL_)ZLIB) += zlib/
 obj-$(CONFIG_$(SPL_)ZSTD) += zstd/
diff --git a/lib/mbedtls/Kconfig b/lib/mbedtls/Kconfig
index 77959f01fdd..6dbf1898d12 100644
--- a/lib/mbedtls/Kconfig
+++ b/lib/mbedtls/Kconfig
@@ -117,12 +117,14 @@ endif # LEGACY_CRYPTO_BASIC
 
 config LEGACY_CRYPTO_CERT
 	bool "legacy certificate libraries"
+	select ASN1_DECODER_LEGACY if ASN1_DECODER
 	select ASYMMETRIC_PUBLIC_KEY_LEGACY if \
 		ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	select RSA_PUBLIC_KEY_PARSER_LEGACY if RSA_PUBLIC_KEY_PARSER
 	select X509_CERTIFICATE_PARSER_LEGACY if X509_CERTIFICATE_PARSER
 	select PKCS7_MESSAGE_PARSER_LEGACY if PKCS7_MESSAGE_PARSER
 	select MSCODE_PARSER_LEGACY if MSCODE_PARSER
+	select SPL_ASN1_DECODER_LEGACY if SPL_ASN1_DECODER
 	select SPL_ASYMMETRIC_PUBLIC_KEY_LEGACY if \
 		SPL_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	select SPL_RSA_PUBLIC_KEY_PARSER_LEGACY if SPL_RSA_PUBLIC_KEY_PARSER
@@ -131,6 +133,12 @@ config LEGACY_CRYPTO_CERT
 
 if LEGACY_CRYPTO_CERT
 
+config ASN1_DECODER_LEGACY
+	bool "ASN1 decoder with legacy certificate library"
+	depends on LEGACY_CRYPTO_CERT && ASN1_DECODER
+	help
+	  This option chooses legacy certificate library for ASN1 decoder.
+
 config ASYMMETRIC_PUBLIC_KEY_LEGACY
 	bool "Asymmetric public key crypto with legacy certificate library"
 	depends on LEGACY_CRYPTO_CERT && ASYMMETRIC_PUBLIC_KEY_SUBTYPE
@@ -172,6 +180,13 @@ config MSCODE_PARSER_LEGACY
 
 if SPL
 
+config SPL_ASN1_DECODER_LEGACY
+	bool "ASN1 decoder with legacy certificate library in SPL"
+	depends on LEGACY_CRYPTO_CERT && SPL_ASN1_DECODER
+	help
+	  This option chooses legacy certificate library for ASN1 decoder in
+	  SPL.
+
 config SPL_ASYMMETRIC_PUBLIC_KEY_LEGACY
 	bool "Asymmetric public key crypto with legacy certificate library in SPL"
 	depends on LEGACY_CRYPTO_CERT && SPL_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
@@ -317,12 +332,14 @@ endif # MBEDTLS_LIB_CRYPTO
 
 config MBEDTLS_LIB_X509
 	bool "MbedTLS certificate libraries"
+	select ASN1_DECODER_MBEDTLS if ASN1_DECODER
 	select ASYMMETRIC_PUBLIC_KEY_MBEDTLS if \
 		ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	select RSA_PUBLIC_KEY_PARSER_MBEDTLS if RSA_PUBLIC_KEY_PARSER
 	select X509_CERTIFICATE_PARSER_MBEDTLS if X509_CERTIFICATE_PARSER
 	select PKCS7_MESSAGE_PARSER_MBEDTLS if PKCS7_MESSAGE_PARSER
 	select MSCODE_PARSER_MBEDTLS if MSCODE_PARSER
+	select SPL_ASN1_DECODER_MBEDTLS if SPL_ASN1_DECODER
 	select SPL_ASYMMETRIC_PUBLIC_KEY_MBEDTLS if \
 		SPL_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	select SPL_RSA_PUBLIC_KEY_PARSER_MBEDTLS if SPL_RSA_PUBLIC_KEY_PARSER
@@ -331,6 +348,12 @@ config MBEDTLS_LIB_X509
 
 if MBEDTLS_LIB_X509
 
+config ASN1_DECODER_MBEDTLS
+	bool "ASN1 decoder with MbedTLS certificate library"
+	depends on MBEDTLS_LIB_X509 && ASN1_DECODER
+	help
+	  This option chooses MbedTLS certificate library for ASN1 decoder.
+
 config ASYMMETRIC_PUBLIC_KEY_MBEDTLS
 	bool "Asymmetric public key crypto with MbedTLS certificate library"
 	depends on MBEDTLS_LIB_X509 && ASYMMETRIC_PUBLIC_KEY_SUBTYPE
@@ -372,6 +395,13 @@ config MSCODE_PARSER_MBEDTLS
 
 if SPL
 
+config SPL_ASN1_DECODER_MBEDTLS
+	bool "ASN1 decoder with MbedTLS certificate library in SPL"
+	depends on MBEDTLS_LIB_X509 && SPL_ASN1_DECODER
+	help
+	  This option chooses MbedTLS certificate library for ASN1 decoder in
+	  SPL.
+
 config SPL_ASYMMETRIC_PUBLIC_KEY_MBEDTLS
 	bool "Asymmetric public key crypto with MbedTLS certificate library in SPL"
 	depends on MBEDTLS_LIB_X509 && SPL_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
diff --git a/lib/mbedtls/Makefile b/lib/mbedtls/Makefile
index 40031994708..14bc59f6cf3 100644
--- a/lib/mbedtls/Makefile
+++ b/lib/mbedtls/Makefile
@@ -36,7 +36,7 @@ mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA512_MBEDTLS) += \
 # MbedTLS X509 library
 obj-$(CONFIG_MBEDTLS_LIB_X509) += mbedtls_lib_x509.o
 mbedtls_lib_x509-y := $(MBEDTLS_LIB_DIR)/x509.o
-mbedtls_lib_x509-$(CONFIG_$(SPL_)ASN1_DECODER) += \
+mbedtls_lib_x509-$(CONFIG_$(SPL_)ASN1_DECODER_MBEDTLS) += \
 	$(MBEDTLS_LIB_DIR)/asn1parse.o \
 	$(MBEDTLS_LIB_DIR)/asn1write.o \
 	$(MBEDTLS_LIB_DIR)/oid.o
-- 
2.25.1