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added bit string printing in ASN1 decoder

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This commit is contained in:
iceman1001 2023-03-13 21:36:59 +01:00
commit 04173fc961
1 changed files with 54 additions and 1 deletions
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55
client/src/crypto/asn1dump.c
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@ -44,6 +44,7 @@ enum asn1_tag_t {
ASN1_TAG_STR_TIME,
ASN1_TAG_OBJECT_ID,
ASN1_TAG_HEX,
ASN1_TAG_BIT_STRING,
};
struct asn1_tag {
@ -62,7 +63,7 @@ static const struct asn1_tag asn1_tags[] = {
// ASN.1
{ 0x01, "BOOLEAN", ASN1_TAG_BOOLEAN },
{ 0x02, "INTEGER", ASN1_TAG_INTEGER },
{ 0x03, "BIT STRING", ASN1_TAG_GENERIC },
{ 0x03, "BIT STRING", ASN1_TAG_BIT_STRING },
{ 0x04, "OCTET STRING", ASN1_TAG_OCTET_STRING },
{ 0x05, "NULL", ASN1_TAG_GENERIC },
{ 0x06, "OBJECT IDENTIFIER", ASN1_TAG_OBJECT_ID },
@ -170,6 +171,54 @@ static void asn1_tag_dump_string(const struct tlv *tlv, const struct asn1_tag *t
PrintAndLogEx(NORMAL, " value: '" _GREEN_("%.*s") "' hex: '%s'", tlv->len, tlv->value, sprint_hex(tlv->value, tlv->len));
}
static void asn1_tag_dump_bitstring(const struct tlv *tlv, const struct asn1_tag *tag, int level) {
size_t len = tlv->len;
size_t n = (len * 8);
bool skip = false;
if (tlv->value[0] == 0) {
n -= 8;
len--;
skip = true;
}
uint8_t *d = calloc(n, sizeof(uint8_t));
if (d == NULL) {
return;
}
if (skip)
bytes_to_bytebits(tlv->value + 1, len, d);
else
bytes_to_bytebits(tlv->value, len, d);
level++;
PrintAndLogEx(NORMAL, " (%zu bit)", n);
PrintAndLogEx(INFO, "%*s" NOLF, 1 + (level * 4), "");
for (int i = 0; i < n; i++) {
char c = d[i];
if (c < 2) {
c += '0';
} else {
goto out;
}
PrintAndLogEx(NORMAL, "%c" NOLF, c);
if (((i + 1) % 64) == 0) {
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(INFO, "%*s" NOLF, 1 + (level * 4), "");
}
}
out:
free(d);
PrintAndLogEx(NORMAL, "");
}
static void asn1_tag_dump_hex(const struct tlv *tlv, const struct asn1_tag *tag, int level) {
PrintAndLogEx(NORMAL, " value: '%s'", sprint_hex_inrow(tlv->value, tlv->len));
}
@ -378,6 +427,10 @@ bool asn1_tag_dump(const struct tlv *tlv, int level, bool *candump) {
asn1_tag_dump_hex(tlv, tag, level);
*candump = false;
break;
case ASN1_TAG_BIT_STRING:
asn1_tag_dump_bitstring(tlv, tag, level);
*candump = false;
break;
};
return true;