Add a function for parsing RFC 5280's "TBSCertificate".

net/data/parse_certificate_unittest/tbs_v3_all_optionals.pem

Index: net/data/parse_certificate_unittest/tbs_v3_all_optionals.pem
diff --git a/net/data/parse_certificate_unittest/tbs_v3_all_optionals.pem b/net/data/parse_certificate_unittest/tbs_v3_all_optionals.pem
new file mode 100644
index 0000000000000000000000000000000000000000..de134a7c5a058b68640aaa77cb1dfbca8a801ebb
--- /dev/null
+++ b/net/data/parse_certificate_unittest/tbs_v3_all_optionals.pem
@@ -0,0 +1,107 @@
+This is a version 3 TBSCertificate containing all the possible optional fields.
+
+
+
+-----BEGIN TBS CERTIFICATE-----
+MDCgAwIBAgIBATADBAEBMAMEAQUwAwQBCDADBAEKMAMEAfOBAgC5ggIAyqMFMAMEAd0=
+-----END TBS CERTIFICATE-----
+
+$ openssl asn1parse -i < [TBS CERTIFICATE]
+    0:d=0  hl=2 l=  48 cons: SEQUENCE          
+    2:d=1  hl=2 l=   3 cons:  cont [ 0 ]        
+    4:d=2  hl=2 l=   1 prim:   INTEGER           :02
+    7:d=1  hl=2 l=   1 prim:  INTEGER           :01
+   10:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   12:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:01
+   15:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   17:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:05
+   20:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   22:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:08
+   25:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   27:d=2  hl=2 l=   1 prim:   OCTET STRING      :
+
+   30:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   32:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:F3
+   35:d=1  hl=2 l=   2 prim:  cont [ 1 ]        
+   39:d=1  hl=2 l=   2 prim:  cont [ 2 ]        
+   43:d=1  hl=2 l=   5 cons:  cont [ 3 ]        
+   45:d=2  hl=2 l=   3 cons:   SEQUENCE          
+   47:d=3  hl=2 l=   1 prim:    OCTET STRING      [HEX DUMP]:DD
+
+
+
+-----BEGIN SERIAL NUMBER-----
+AQ==
+-----END SERIAL NUMBER-----
+
+
+
+-----BEGIN SIGNATURE ALGORITHM-----
+MAMEAQE=
+-----END SIGNATURE ALGORITHM-----
+
+$ openssl asn1parse -i < [SIGNATURE ALGORITHM]
+    0:d=0  hl=2 l=   3 cons: SEQUENCE          
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:01
+
+
+
+-----BEGIN ISSUER-----
+MAMEAQU=
+-----END ISSUER-----
+
+$ openssl asn1parse -i < [ISSUER]
+    0:d=0  hl=2 l=   3 cons: SEQUENCE          
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:05
+
+
+
+-----BEGIN VALIDITY-----
+MAMEAQg=
+-----END VALIDITY-----
+
+$ openssl asn1parse -i < [VALIDITY]
+    0:d=0  hl=2 l=   3 cons: SEQUENCE          
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:08
+
+
+
+-----BEGIN SUBJECT-----
+MAMEAQo=
+-----END SUBJECT-----
+
+$ openssl asn1parse -i < [SUBJECT]
+    0:d=0  hl=2 l=   3 cons: SEQUENCE          
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      :
+
+
+
+-----BEGIN SPKI-----
+MAMEAfM=
+-----END SPKI-----
+
+$ openssl asn1parse -i < [SPKI]
+    0:d=0  hl=2 l=   3 cons: SEQUENCE          
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:F3
+
+
+
+-----BEGIN ISSUER UNIQUE ID-----
+uQ==
+-----END ISSUER UNIQUE ID-----
+
+
+
+-----BEGIN SUBJECT UNIQUE ID-----
+yg==
+-----END SUBJECT UNIQUE ID-----
+
+
+
+-----BEGIN EXTENSIONS-----
+MAMEAd0=
+-----END EXTENSIONS-----
+
+$ openssl asn1parse -i < [EXTENSIONS]
+    0:d=0  hl=2 l=   3 cons: SEQUENCE          
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:DD