[PATCH v2 19/28] lib/crypto: Adapt x509_cert_parser to MbedTLS

[Raymond Mao]

Adapt x509_cert_parser and x509_public_key for building with MbedTLS

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
Changes in v2
- Move the porting layer to MbedTLS dir.

 include/crypto/x509_parser.h | 36 ++++++++++++++++++++++++++++++++++++
 lib/crypto/Makefile          |  2 ++
 lib/crypto/x509_public_key.c |  4 ++++
 3 files changed, 42 insertions(+)

diff --git a/include/crypto/x509_parser.h b/include/crypto/x509_parser.h
index 4cbdc1d6612..32ca9d5db79 100644
--- a/include/crypto/x509_parser.h
+++ b/include/crypto/x509_parser.h
@@ -11,8 +11,36 @@
 #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 <external/mbedtls/include/mbedtls/error.h>
+#include <external/mbedtls/include/mbedtls/asn1.h>
+#endif
 
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+/* Backup of part of the parsing context */
+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:
+ * '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 inuse.
+ */
 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 +76,12 @@ struct x509_certificate {
  * x509_cert_parser.c
  */
 extern void x509_free_certificate(struct x509_certificate *cert);
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
+int x509_populate_pubkey(mbedtls_x509_crt *cert, struct public_key **pub_key);
+int x509_populate_cert(mbedtls_x509_crt *mbedtls_cert,
+		       struct x509_certificate **pcert);
+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 +90,8 @@ 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/Makefile b/lib/crypto/Makefile
index 8f7d9811f03..c89cef5685c 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -29,6 +29,7 @@ ifdef CONFIG_SPL_BUILD
 CFLAGS_rsa_helper.o += -I$(obj)
 endif
 
+ifneq ($(CONFIG_MBEDTLS_LIB_X509), y)
 #
 # X.509 Certificate handling
 #
@@ -45,6 +46,7 @@ $(obj)/x509_cert_parser.o: \
 
 $(obj)/x509.asn1.o: $(obj)/x509.asn1.c $(obj)/x509.asn1.h
 $(obj)/x509_akid.asn1.o: $(obj)/x509_akid.asn1.c $(obj)/x509_akid.asn1.h
+endif
 
 #
 # PKCS#7 message handling
diff --git a/lib/crypto/x509_public_key.c b/lib/crypto/x509_public_key.c
index a10145a7cdc..962611f3fee 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.
@@ -139,6 +141,8 @@ error:
 	return ret;
 }
 
+#endif /* !CONFIG_IS_ENABLED(MBEDTLS_LIB_X509) */
+
 /*
  * Check for self-signedness in an X.509 cert and if found, check the signature
  * immediately if we can.
-- 
2.25.1