RTDECL(int) RTAsn1OctetString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1OCTETSTRING pThis,
const char *pszErrorTag)
{
pThis->pEncapsulated = NULL;
RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
if (RT_SUCCESS(rc))
{
rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_OCTET_STRING,
ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
fFlags, pszErrorTag, "OCTET STRING");
if (RT_SUCCESS(rc))
{
if ( !(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED)
|| (fFlags & RTASN1CURSOR_GET_F_IMPLICIT) ) /* PKCS #7 ContentInfo tweak. */
{
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1OctetString_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
"%s: Constructed OCTET STRING not implemented.", pszErrorTag);
}
else
rc = RTAsn1CursorSetInfo(pCursor, rc, "%s: Not OCTET STRING: fClass=%#x / uTag=%#x",
pszErrorTag, pThis->Asn1Core.fClass, pThis->Asn1Core.uTag);
}
RT_ZERO(*pThis);
return rc;
}
/**
* Common worker for the specific string type getters.
*
* @returns IPRT status code
* @param pCursor The cursor.
* @param fFlags The RTASN1CURSOR_GET_F_XXX flags.
* @param uTag The string tag.
* @param pThis The output object.
* @param pszErrorTag The error tag.
* @param pszWhat The string type name.
*/
static int rtAsn1XxxString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, uint8_t uTag, PRTASN1STRING pThis,
const char *pszErrorTag, const char *pszWhat)
{
pThis->cchUtf8 = 0;
pThis->pszUtf8 = NULL;
int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
if (RT_SUCCESS(rc))
{
rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, uTag,
ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
fFlags, pszErrorTag, pszWhat);
if (RT_SUCCESS(rc))
{
if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
{
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1String_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
RTAsn1CursorInitAllocation(pCursor, &pThis->Allocation);
/* UTF-8 conversion is done lazily, upon request. */
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
"%s: Constructed %s not implemented.", pszErrorTag, pszWhat);
}
}
RT_ZERO(*pThis);
return rc;
}
RTDECL(int) RTAsn1BitString_DecodeAsn1Ex(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pThis,
const char *pszErrorTag)
{
pThis->cBits = 0;
pThis->cMaxBits = cMaxBits;
pThis->uBits.pv = NULL;
pThis->pEncapsulated = NULL;
RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
if (RT_SUCCESS(rc))
{
rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_BIT_STRING,
ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
fFlags, pszErrorTag, "BIT STRING");
if (RT_SUCCESS(rc))
{
if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
{
if ( ( cMaxBits == UINT32_MAX
|| RT_ALIGN(cMaxBits, 8) / 8 + 1 >= pThis->Asn1Core.cb)
&& pThis->Asn1Core.cb > 0)
{
uint8_t cUnusedBits = pThis->Asn1Core.cb > 0 ? *pThis->Asn1Core.uData.pu8 : 0;
if (pThis->Asn1Core.cb < 2)
{
/* Not bits present. */
if (cUnusedBits == 0)
{
pThis->cBits = 0;
pThis->uBits.pv = NULL;
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Bad unused bit count: %#x (cb=%#x)",
pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
}
else if (cUnusedBits < 8)
{
pThis->cBits = (pThis->Asn1Core.cb - 1) * 8;
pThis->cBits -= cUnusedBits;
pThis->uBits.pu8 = pThis->Asn1Core.uData.pu8 + 1;
if ( !(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
|| cUnusedBits == 0
|| !( pThis->uBits.pu8[pThis->Asn1Core.cb - 2] & (((uint8_t)1 << cUnusedBits) - (uint8_t)1) ) )
{
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Unused bits shall be zero in DER/CER mode: last byte=%#x cUnused=%#x",
pszErrorTag, pThis->uBits.pu8[pThis->cBits / 8], cUnusedBits);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Bad unused bit count: %#x (cb=%#x)",
pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Size mismatch: cb=%#x, expected %#x (cMaxBits=%#x)",
pszErrorTag, pThis->Asn1Core.cb, RT_ALIGN(cMaxBits, 8) / 8 + 1, cMaxBits);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
"%s: Constructed BIT STRING not implemented.", pszErrorTag);
}
}
RT_ZERO(*pThis);
return rc;
}
