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264 lines
9.4 KiB
264 lines
9.4 KiB
//+-------------------------------------------------------------------------
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1996 - 1999
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//
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// File: asn1util.h
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//
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// Contents: ASN.1 utility functions.
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//
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// APIs:
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// Asn1UtilDecodeLength
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// Asn1UtilExtractContent
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// Asn1UtilIsPKCS7WithoutContentType
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// Asn1UtilAdjustEncodedLength
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// Asn1UtilExtractValues
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// Asn1UtilExtractPKCS7SignedDataContent
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// Asn1UtilExtractCertificateToBeSignedContent
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// Asn1UtilExtractCertificatePublicKeyInfo
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// Asn1UtilExtractKeyIdFromCertInfo
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//
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// History: 06-Dec-96 philh created from kevinr's wincrmsg version
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//--------------------------------------------------------------------------
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#ifndef __ASN1UTIL_H__
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#define __ASN1UTIL_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ASN1UTIL_INSUFFICIENT_DATA -2
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//+-------------------------------------------------------------------------
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// ASN.1 Tag Defines
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//--------------------------------------------------------------------------
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#define ASN1UTIL_TAG_NULL 0x00
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#define ASN1UTIL_TAG_BOOLEAN 0x01
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#define ASN1UTIL_TAG_INTEGER 0x02
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#define ASN1UTIL_TAG_BITSTRING 0x03
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#define ASN1UTIL_TAG_OCTETSTRING 0x04
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#define ASN1UTIL_TAG_OID 0x06
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#define ASN1UTIL_TAG_UTC_TIME 0x17
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#define ASN1UTIL_TAG_GENERALIZED_TIME 0x18
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#define ASN1UTIL_TAG_CONSTRUCTED 0x20
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#define ASN1UTIL_TAG_SEQ 0x30
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#define ASN1UTIL_TAG_SET 0x31
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#define ASN1UTIL_TAG_CONTEXT_0 0x80
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#define ASN1UTIL_TAG_CONTEXT_1 0x81
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#define ASN1UTIL_TAG_CONSTRUCTED_CONTEXT_0 \
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(ASN1UTIL_TAG_CONSTRUCTED | ASN1UTIL_TAG_CONTEXT_0)
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#define ASN1UTIL_TAG_CONSTRUCTED_CONTEXT_1 \
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(ASN1UTIL_TAG_CONSTRUCTED | ASN1UTIL_TAG_CONTEXT_1)
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//+-------------------------------------------------------------------------
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// ASN.1 Length Defines for indefinite length encooding
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//--------------------------------------------------------------------------
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#define ASN1UTIL_LENGTH_INDEFINITE 0x80
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#define ASN1UTIL_LENGTH_NULL 0x00
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//+-------------------------------------------------------------------------
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// Get the number of contents octets in a definite-length BER-encoding.
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//
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// Parameters:
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// pcbContent - receives the number of contents octets
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// pbLength - points to the first length octet
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// cbDER - number of bytes remaining in the DER encoding
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//
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// Returns:
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// success - the number of bytes in the length field, >=0
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// failure - <0
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//--------------------------------------------------------------------------
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LONG
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WINAPI
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Asn1UtilDecodeLength(
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OUT DWORD *pcbContent,
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IN const BYTE *pbLength,
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IN DWORD cbDER);
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//+-------------------------------------------------------------------------
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// Point to the content octets in a DER-encoded blob.
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//
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// Returns:
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// success - the number of bytes skipped, >=0
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// failure - <0
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//
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// Assumption: pbData points to a definite-length BER-encoded blob.
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//--------------------------------------------------------------------------
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LONG
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WINAPI
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Asn1UtilExtractContent(
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IN const BYTE *pbDER,
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IN DWORD cbDER,
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OUT DWORD *pcbContent,
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OUT const BYTE **ppbContent);
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//+-------------------------------------------------------------------------
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// Returns TRUE if we believe this is a Bob special that has ommitted the
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// PKCS #7 ContentType.
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//
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// For PKCS #7: an Object Identifier tag (0x06) immediately follows the
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// identifier and length octets. For a Bob special: an integer tag (0x02)
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// follows the identifier and length octets.
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//--------------------------------------------------------------------------
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BOOL
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WINAPI
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Asn1UtilIsPKCS7WithoutContentType(
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IN const BYTE *pbDER,
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IN DWORD cbDER);
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//+-------------------------------------------------------------------------
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// Decode the Asn1 length bytes to possibly downward adjust the length.
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//
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// The returned length is always <= cbDER.
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//--------------------------------------------------------------------------
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DWORD
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WINAPI
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Asn1UtilAdjustEncodedLength(
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IN const BYTE *pbDER,
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IN DWORD cbDER
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);
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typedef struct _ASN1UTIL_EXTRACT_VALUE_PARA {
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// See below for list of operations and optional return blobs.
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DWORD dwFlags;
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// The following 0 terminated array of tags is optional. If ommited, the
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// value may contain any tag. Note, for OPTIONAL_STEP_OVER, not optional.
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const BYTE *rgbTag;
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} ASN1UTIL_EXTRACT_VALUE_PARA, *PASN1UTIL_EXTRACT_VALUE_PARA;
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// The lower 8 bits of dwFlags is set to one of the following operations
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#define ASN1UTIL_MASK_VALUE_OP 0xFF
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#define ASN1UTIL_STEP_INTO_VALUE_OP 1
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#define ASN1UTIL_STEP_OVER_VALUE_OP 2
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#define ASN1UTIL_OPTIONAL_STEP_OVER_VALUE_OP 3
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#define ASN1UTIL_RETURN_VALUE_BLOB_FLAG 0x80000000
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#define ASN1UTIL_RETURN_CONTENT_BLOB_FLAG 0x40000000
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//+-------------------------------------------------------------------------
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// Extract one or more tagged values from the ASN.1 encoded byte array.
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//
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// Either steps into the value's content octets (ASN1UTIL_STEP_INTO_VALUE_OP)
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// or steps over the value's tag, length and content octets
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// (ASN1UTIL_STEP_OVER_VALUE_OP or ASN1UTIL_OPTIONAL_STEP_OVER_VALUE_OP).
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//
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// For tag matching, only supports single byte tags. STEP_OVER values
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// must be definite-length encoded.
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//
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// *pcValue is updated with the number of values successfully extracted.
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//
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// Returns:
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// success - >= 0 => length of all values successfully extracted. For
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// STEP_INTO, only the tag and length octets.
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// failure - < 0 => negative (offset + 1) of first bad tagged value
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// LastError is updated with the error.
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//
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// A non-NULL rgValueBlob[] is updated with the pointer to and length of the
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// tagged value or its content octets. For OPTIONAL_STEP_OVER, if tag isn't
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// found, pbData and cbData are set to 0. If a STEP_INTO value is
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// indefinite-length encoded, cbData is set to CMSG_INDEFINITE_LENGTH.
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// If ASN1UTIL_DEFINITE_LENGTH_FLAG is set, then, all returned lengths
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// are definite-length, ie, CMSG_INDEFINITE_LENGTH is never returned.
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//
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// If ASN1UTIL_RETURN_VALUE_BLOB_FLAG is set, pbData points to
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// the tag. cbData includes the tag, length and content octets.
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//
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// If ASN1UTIL_RETURN_CONTENT_BLOB_FLAG is set, pbData points to the content
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// octets. cbData includes only the content octets.
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//
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// If neither BLOB_FLAG is set, rgValueBlob[] isn't updated.
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//--------------------------------------------------------------------------
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LONG
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WINAPI
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Asn1UtilExtractValues(
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IN const BYTE *pbEncoded,
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IN DWORD cbEncoded,
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IN DWORD dwFlags,
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IN OUT DWORD *pcValue,
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IN const ASN1UTIL_EXTRACT_VALUE_PARA *rgValuePara,
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OUT OPTIONAL PCRYPT_DER_BLOB rgValueBlob
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);
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#define ASN1UTIL_DEFINITE_LENGTH_FLAG 0x1
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//+-------------------------------------------------------------------------
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// Skips past PKCS7 ASN.1 encoded values to get to the SignedData content.
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//
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// Checks that the outer ContentType has the SignedData OID and optionally
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// checks the inner SignedData content's ContentType.
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//
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// Returns:
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// success - the number of bytes skipped, >=0
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// failure - <0
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//
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// If the SignedData content is indefinite-length encoded,
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// *pcbContent is set to CMSG_INDEFINITE_LENGTH
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//--------------------------------------------------------------------------
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LONG
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WINAPI
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Asn1UtilExtractPKCS7SignedDataContent(
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IN const BYTE *pbEncoded,
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IN DWORD cbEncoded,
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IN OPTIONAL const CRYPT_DER_BLOB *pEncodedInnerOID,
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OUT DWORD *pcbContent,
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OUT const BYTE **ppbContent
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);
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//+-------------------------------------------------------------------------
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// Verifies this is a certificate ASN.1 encoded signed content.
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// Returns the pointer to and length of the ToBeSigned content.
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//
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// Returns an error if the ToBeSigned content isn't definite length
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// encoded.
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//--------------------------------------------------------------------------
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BOOL
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WINAPI
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Asn1UtilExtractCertificateToBeSignedContent(
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IN const BYTE *pbEncoded,
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IN DWORD cbEncoded,
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OUT DWORD *pcbContent,
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OUT const BYTE **ppbContent
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);
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//+-------------------------------------------------------------------------
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// Returns the pointer to and length of the SubjectPublicKeyInfo value in
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// a signed and encoded X.509 certificate.
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//
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// Returns an error if the value isn't definite length encoded.
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//--------------------------------------------------------------------------
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BOOL
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WINAPI
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Asn1UtilExtractCertificatePublicKeyInfo(
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IN const BYTE *pbEncoded,
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IN DWORD cbEncoded,
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OUT DWORD *pcbPublicKeyInfo,
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OUT const BYTE **ppbPublicKeyInfo
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);
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//+-------------------------------------------------------------------------
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// If the Issuer and SerialNumber in the CERT_INFO contains a special
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// KeyID RDN attribute returns TRUE with pKeyId's cbData and pbData updated
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// with the RDN attribute's OCTET_STRING value. Otherwise, returns FALSE.
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//--------------------------------------------------------------------------
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BOOL
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WINAPI
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Asn1UtilExtractKeyIdFromCertInfo(
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IN PCERT_INFO pCertInfo,
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OUT PCRYPT_HASH_BLOB pKeyId
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);
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#ifdef __cplusplus
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} // Balance extern "C" above
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#endif
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#endif
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