diff options
Diffstat (limited to 'asn1_internal.h')
| -rw-r--r-- | asn1_internal.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/asn1_internal.h b/asn1_internal.h new file mode 100644 index 0000000..f6e470f --- /dev/null +++ b/asn1_internal.h @@ -0,0 +1,108 @@ +/* + * asn1.h + * ------ + * Library internal header file for ASN.1 routines. + * + * These functions are not part of the public libhal API. + * + * More than 20 years after it was written, the best simple + * introduction to ASN.1 is still Burt Kalski's "A Layman's Guide to a + * Subset of ASN.1, BER, and DER". Ask your nearest search engine. + * + * Authors: Rob Austein + * Copyright (c) 2015, SUNET + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _HAL_ASN1_H_ +#define _HAL_ASN1_H_ + +#include <stdint.h> +#include <stdlib.h> + +#include <tfm.h> + +#define ASN1_UNIVERSAL 0x00 +#define ASN1_APPLICATION 0x40 +#define ASN1_CONTEXT_SPECIFIC 0x80 +#define ASN1_PRIVATE 0xC0 + +#define ASN1_PRIMITIVE 0x00 +#define ASN1_CONSTRUCTED 0x20 + +#define ASN1_TAG_MASK 0x1F + +#define ASN1_INTEGER (ASN1_PRIMITIVE | 0x02) +#define ASN1_BIT_STRING (ASN1_PRIMITIVE | 0x03) +#define ASN1_OCTET_STRING (ASN1_PRIMITIVE | 0x04) +#define ASN1_NULL (ASN1_PRIMITIVE | 0x05) +#define ASN1_OBJECT_IDENTIFIER (ASN1_PRIMITIVE | 0x06) +#define ASN1_SEQUENCE (ASN1_CONSTRUCTED | 0x10) +#define ASN1_SET (ASN1_CONSTRUCTED | 0x11) + +#define ASN1_EXPLICIT_CONTEXT (ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED) +#define ASN1_EXPLICIT_0 (ASN1_EXPLICIT_CONTEXT + 0) +#define ASN1_EXPLICIT_1 (ASN1_EXPLICIT_CONTEXT + 1) + +/* + * Functions to strip const qualifiers from arguments to libtfm calls + * in a relatively type-safe manner. These don't really have anything + * to do with ASN.1 per se, but all the code that needs them reads + * this header file, so this is the simplest place to put them. + */ + +static inline fp_int *unconst_fp_int(const fp_int * const arg) +{ + return (fp_int *) arg; +} + +static inline uint8_t *unconst_uint8_t(const uint8_t * const arg) +{ + return (uint8_t *) arg; +} + +extern hal_error_t hal_asn1_encode_header(const uint8_t tag, + const size_t value_len, + uint8_t *der, size_t *der_len, const size_t der_max); + +extern hal_error_t hal_asn1_decode_header(const uint8_t tag, + const uint8_t * const der, size_t der_max, + size_t *hlen, size_t *vlen); + +extern hal_error_t hal_asn1_encode_integer(const fp_int * const bn, + uint8_t *der, size_t *der_len, const size_t der_max); + +extern hal_error_t hal_asn1_decode_integer(fp_int *bn, + const uint8_t * const der, size_t *der_len, const size_t der_max); + +#endif /* _HAL_ASN1_H_ */ + +/* + * Local variables: + * indent-tabs-mode: nil + * End: + */ |