2G ems initial

2024-03-13 09:30:40 +08:00
commit eed6460ad2
1234 changed files with 419571 additions and 0 deletions
--- a/include/nettle/asn1.h
+++ b/include/nettle/asn1.h
@@ -0,0 +1,152 @@
+/* asn1.h
+
+   Limited support for ASN.1 DER decoding.
+
+   Copyright (C) 2005 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef NETTLE_ASN1_H_INCLUDED
+#define NETTLE_ASN1_H_INCLUDED
+
+#include "nettle-types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Name mangling */
+#define asn1_der_iterator_first nettle_asn1_der_iterator_first
+#define asn1_der_iterator_next nettle_asn1_der_iterator_next
+#define asn1_der_decode_constructed nettle_asn1_der_decode_constructed
+#define asn1_der_decode_constructed_last nettle_asn1_der_decode_constructed_last
+#define asn1_der_decode_bitstring nettle_asn1_der_decode_bitstring
+#define asn1_der_decode_bitstring_last nettle_asn1_der_decode_bitstring_last
+#define asn1_der_get_uint32 nettle_asn1_der_get_uint32
+#define asn1_der_get_bignum nettle_asn1_der_get_bignum
+
+
+/* enum asn1_type keeps the class number and the constructive in bits
+   13-14, and the constructive flag in bit 12. The remaining 14 bits
+   are the tag (although currently, only tags in the range 0-30 are
+   supported). */
+
+enum
+  {
+    ASN1_TYPE_CONSTRUCTED = 1 << 12,
+
+    ASN1_CLASS_UNIVERSAL = 0,
+    ASN1_CLASS_APPLICATION = 1 << 13,
+    ASN1_CLASS_CONTEXT_SPECIFIC = 2 << 13,
+    ASN1_CLASS_PRIVATE = 3 << 13,
+
+    ASN1_CLASS_MASK = 3 << 13,
+    ASN1_CLASS_SHIFT = 13,
+  };
+
+enum asn1_type
+  {
+    ASN1_BOOLEAN = 1,
+    ASN1_INTEGER = 2,
+    ASN1_BITSTRING = 3,
+    ASN1_OCTETSTRING = 4,
+    ASN1_NULL = 5,
+    ASN1_IDENTIFIER = 6,
+    ASN1_REAL = 9,
+    ASN1_ENUMERATED = 10,
+    ASN1_UTF8STRING = 12,
+    ASN1_SEQUENCE = 16 | ASN1_TYPE_CONSTRUCTED,
+    ASN1_SET = 17 | ASN1_TYPE_CONSTRUCTED,
+    ASN1_PRINTABLESTRING = 19,
+    ASN1_TELETEXSTRING = 20,
+    ASN1_IA5STRING = 22,
+    ASN1_UTC = 23,
+    ASN1_UNIVERSALSTRING = 28,
+    ASN1_BMPSTRING = 30,
+  };
+
+enum asn1_iterator_result
+  {
+    ASN1_ITERATOR_ERROR,
+    ASN1_ITERATOR_PRIMITIVE,
+    ASN1_ITERATOR_CONSTRUCTED,
+    ASN1_ITERATOR_END,
+  };
+
+/* Parsing DER objects. */
+struct asn1_der_iterator
+{
+  size_t buffer_length;
+  const uint8_t *buffer;
+
+  /* Next object to parse. */
+  size_t pos;
+
+  enum asn1_type type;
+
+  /* Pointer to the current object */
+  size_t length;
+  const uint8_t *data;
+};
+
+/* Initializes the iterator. */
+enum asn1_iterator_result
+asn1_der_iterator_first(struct asn1_der_iterator *iterator,
+			size_t length, const uint8_t *input);
+
+enum asn1_iterator_result
+asn1_der_iterator_next(struct asn1_der_iterator *iterator);
+
+/* Starts parsing of a constructed object. */
+enum asn1_iterator_result
+asn1_der_decode_constructed(struct asn1_der_iterator *i,
+			    struct asn1_der_iterator *contents);
+
+/* For the common case that we have a sequence at the end of the
+   object. Checks that the current object is the final one, and then
+   reinitializes the iterator to parse its ontents. */
+enum asn1_iterator_result
+asn1_der_decode_constructed_last(struct asn1_der_iterator *i);
+
+enum asn1_iterator_result
+asn1_der_decode_bitstring(struct asn1_der_iterator *i,
+			  struct asn1_der_iterator *contents);
+
+enum asn1_iterator_result
+asn1_der_decode_bitstring_last(struct asn1_der_iterator *i);
+
+/* All these functions return 1 on success, 0 on failure */
+int
+asn1_der_get_uint32(struct asn1_der_iterator *i,
+		    uint32_t *x);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETTLE_ASN1_H_INCLUDED */