[PATCH v6 19/28] lib/crypto: Adapt x509_cert_parser to MbedTLS

[Raymond Mao]

Previous patch has introduced MbedTLS porting layer for x509 cert parser,
here to adjust the header and makefiles accordingly.

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
Changes in v2
- Move the porting layer to MbedTLS dir.
Changes in v3
- Update commit message.
Changes in v4
- Control building legacy library via '_LEGACY' Kconfig.
- Add function comments for the new APIs.
Changes in v5
- Correct kconfig dependence.
- Correct header file include directories.
- Adjust a few inline comments.
Changes in v6
- None.

 include/crypto/x509_parser.h | 55 ++++++++++++++++++++++++++++++++++++
 lib/crypto/Kconfig           |  2 +-
 lib/crypto/Makefile          |  4 +--
 lib/crypto/x509_public_key.c |  2 ++
 4 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/include/crypto/x509_parser.h b/include/crypto/x509_parser.h
index 4cbdc1d6612..0e22e33f66b 100644
--- a/include/crypto/x509_parser.h
+++ b/include/crypto/x509_parser.h
@@ -11,8 +11,35 @@
 #include <linux/time.h>
 #include <crypto/public_key.h>
 #include <keys/asymmetric-type.h>
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+#include <image.h>
+#include <mbedtls/error.h>
+#include <mbedtls/asn1.h>
+#endif
 
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+struct x509_cert_mbedtls_ctx {
+	void	*tbs;			/* Signed data */
+	void	*raw_serial;		/* Raw serial number in ASN.1 */
+	void	*raw_issuer;		/* Raw issuer name in ASN.1 */
+	void	*raw_subject;		/* Raw subject name in ASN.1 */
+	void	*raw_skid;		/* Raw subjectKeyId in ASN.1 */
+};
+#endif
+
+/*
+ * MbedTLS integration Notes:
+ *
+ * Fields we don't need to populate from MbedTLS context:
+ * 'raw_sig' and 'raw_sig_size' are buffer for x509_parse_context,
+ * not needed for MbedTLS.
+ * 'signer' and 'seen' are used internally by pkcs7_verify.
+ * 'verified' is not in use.
+ */
 struct x509_certificate {
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+	struct x509_cert_mbedtls_ctx *mbedtls_ctx;
+#endif
 	struct x509_certificate *next;
 	struct x509_certificate *signer;	/* Certificate that signed this one */
 	struct public_key *pub;			/* Public key details */
@@ -48,6 +75,32 @@ struct x509_certificate {
  * x509_cert_parser.c
  */
 extern void x509_free_certificate(struct x509_certificate *cert);
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+/**
+ * x509_populate_pubkey() - Populate public key from MbedTLS context
+ *
+ * @cert:	Pointer to MbedTLS X509 cert
+ * @pub_key:	Pointer to the populated public key handle
+ * Return: 0 on succcess, error code on failure
+ */
+int x509_populate_pubkey(mbedtls_x509_crt *cert, struct public_key **pub_key);
+/**
+ * x509_populate_cert() - Populate X509 cert from MbedTLS context
+ *
+ * @mbedtls_cert:	Pointer to MbedTLS X509 cert
+ * @pcert:		Pointer to the populated X509 cert handle
+ * Return: 0 on succcess, error code on failure
+ */
+int x509_populate_cert(mbedtls_x509_crt *mbedtls_cert,
+		       struct x509_certificate **pcert);
+/**
+ * x509_get_timestamp() - Translate timestamp from MbedTLS context
+ *
+ * @x509_time:	Pointer to MbedTLS time
+ * Return: Time in time64_t format
+ */
+time64_t x509_get_timestamp(const mbedtls_x509_time *x509_time);
+#endif
 extern struct x509_certificate *x509_cert_parse(const void *data, size_t datalen);
 extern int x509_decode_time(time64_t *_t,  size_t hdrlen,
 			    unsigned char tag,
@@ -56,6 +109,8 @@ extern int x509_decode_time(time64_t *_t,  size_t hdrlen,
 /*
  * x509_public_key.c
  */
+#if !CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
 extern int x509_get_sig_params(struct x509_certificate *cert);
+#endif
 extern int x509_check_for_self_signed(struct x509_certificate *cert);
 #endif /* _X509_PARSER_H */
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig
index 6e0656ad1c5..6106190677e 100644
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -1,6 +1,6 @@
 menuconfig ASYMMETRIC_KEY_TYPE
 	bool "Asymmetric (public-key cryptographic) key Support"
-	depends on FIT_SIGNATURE
+	depends on LEGACY_CRYPTO_CERT || MBEDTLS_LIB_X509
 	help
 	  This option provides support for a key type that holds the data for
 	  the asymmetric keys used for public key cryptographic operations such
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index 7e877214aa8..4302f197297 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -32,11 +32,11 @@ endif
 # X.509 Certificate handling
 #
 obj-$(CONFIG_$(SPL_)X509_CERTIFICATE_PARSER) += x509_key_parser.o
-x509_key_parser-y := \
+x509_key_parser-y := x509_helper.o
+x509_key_parser-$(CONFIG_$(SPL_)X509_CERTIFICATE_PARSER_LEGACY) += \
 	x509.asn1.o \
 	x509_akid.asn1.o \
 	x509_cert_parser.o \
-	x509_helper.o \
 	x509_public_key.o
 
 $(obj)/x509_cert_parser.o: \
diff --git a/lib/crypto/x509_public_key.c b/lib/crypto/x509_public_key.c
index 4ba13c1adc3..310edbd21be 100644
--- a/lib/crypto/x509_public_key.c
+++ b/lib/crypto/x509_public_key.c
@@ -30,6 +30,8 @@
 #include "x509_parser.h"
 #endif
 
+#if !CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+
 /*
  * Set up the signature parameters in an X.509 certificate.  This involves
  * digesting the signed data and extracting the signature.
-- 
2.25.1