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+/*
+ * 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)
+
+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(fp_int *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:
+ */