[pkg-opensc-commit] [opensc] 41/295: parse Extended Length Information in EF.ATR/INFO

[Eric Dorland]

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eric pushed a commit to branch master
in repository opensc.

commit 2909ba28a98c24f79bf0db987c52cc05ae943332
Author: Frank Morgner <frankmorgner at gmail.com>
Date:   Mon Jun 27 18:03:51 2016 +0200

    parse Extended Length Information in EF.ATR/INFO
---
 src/libopensc/ef-atr.c  | 17 ++++++++++++++++-
 src/libopensc/iso7816.h |  5 +++++
 src/libopensc/opensc.h  |  2 ++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/libopensc/ef-atr.c b/src/libopensc/ef-atr.c
index 738306c..89d08d3 100644
--- a/src/libopensc/ef-atr.c
+++ b/src/libopensc/ef-atr.c
@@ -31,7 +31,7 @@
 #include "asn1.h"
 #include "iso7816.h"
 
-static int 
+static int
 sc_parse_ef_atr_content(struct sc_card *card, unsigned char *buf, size_t buflen)
 {
 	struct sc_context *ctx = card->ctx;
@@ -68,6 +68,21 @@ sc_parse_ef_atr_content(struct sc_card *card, unsigned char *buf, size_t buflen)
 				ef_atr.df_selection, ef_atr.unit_size, ef_atr.card_capabilities);
 	}
 
+	if (ef_atr.card_capabilities & ISO7816_CAP_EXTENDED_LENGTH_INFO) {
+		/* Extended Length Information in EF.ATR/INFO */
+		tag = sc_asn1_find_tag(ctx, buf, buflen, ISO7816_TAG_II_EXTENDED_LENGTH, &taglen);
+		if (tag && taglen >= 8) {
+			/* The command- and response-APDU size limitations are defined by
+			 * two integers, each nested in a DO'02'.
+			 * We skip parsing the nested DOs and jump directly to the numbers */
+			ef_atr.max_command_apdu = bebytes2ushort(tag + 2);
+			ef_atr.max_response_apdu = bebytes2ushort(tag + 6);
+			sc_log(ctx, "EF.ATR: Biggest command APDU %u bytes, response APDU %u", 
+					(unsigned long) ef_atr.max_command_apdu,
+					(unsigned long) ef_atr.max_response_apdu);
+		}
+	}
+
 	tag = sc_asn1_find_tag(ctx, buf, buflen, ISO7816_TAG_II_AID, &taglen);
 	if (tag) {
 		if (taglen > sizeof(ef_atr.aid.value))
diff --git a/src/libopensc/iso7816.h b/src/libopensc/iso7816.h
index 6b6f9cc..c533484 100644
--- a/src/libopensc/iso7816.h
+++ b/src/libopensc/iso7816.h
@@ -38,6 +38,11 @@ extern "C" {
 #define ISO7816_TAG_II_STATUS_LCS		0x81
 #define ISO7816_TAG_II_STATUS_SW		0x82
 #define ISO7816_TAG_II_STATUS_LCS_SW		0x83
+#define ISO7816_TAG_II_EXTENDED_LENGTH		0x7F66
+
+#define ISO7816_CAP_CHAINING		0x80
+#define ISO7816_CAP_EXTENDED_LENGTH		0x40
+#define ISO7816_CAP_EXTENDED_LENGTH_INFO	0x20
 
 /* Other interindustry data tags */
 #define IASECC_TAG_II_IO_BUFFER_SIZES		0xE0
diff --git a/src/libopensc/opensc.h b/src/libopensc/opensc.h
index 5a76fca..65d626e 100644
--- a/src/libopensc/opensc.h
+++ b/src/libopensc/opensc.h
@@ -242,6 +242,8 @@ struct sc_ef_atr {
 	unsigned char df_selection;
 	size_t unit_size;
 	unsigned char card_capabilities;
+	size_t max_command_apdu;
+	size_t max_response_apdu;
 
 	struct sc_aid aid;
 

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