134 lines
5.1 KiB
Plaintext
134 lines
5.1 KiB
Plaintext
=pod
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=head1 NAME
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ASN1_INTEGER_get_uint64, ASN1_INTEGER_set_uint64,
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ASN1_INTEGER_get_int64, ASN1_INTEGER_get, ASN1_INTEGER_set_int64, ASN1_INTEGER_set, BN_to_ASN1_INTEGER, ASN1_INTEGER_to_BN, ASN1_ENUMERATED_get_int64, ASN1_ENUMERATED_get, ASN1_ENUMERATED_set_int64, ASN1_ENUMERATED_set, BN_to_ASN1_ENUMERATED, ASN1_ENUMERATED_to_BN
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- ASN.1 INTEGER and ENUMERATED utilities
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=head1 SYNOPSIS
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#include <openssl/asn1.h>
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int ASN1_INTEGER_get_int64(int64_t *pr, const ASN1_INTEGER *a);
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long ASN1_INTEGER_get(const ASN1_INTEGER *a);
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int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t r);
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int ASN1_INTEGER_set(const ASN1_INTEGER *a, long v);
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int ASN1_INTEGER_get_uint64(uint64_t *pr, const ASN1_INTEGER *a);
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int ASN1_INTEGER_set_uint64(ASN1_INTEGER *a, uint64_t r);
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ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai);
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BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn);
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int ASN1_ENUMERATED_get_int64(int64_t *pr, const ASN1_ENUMERATED *a);
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long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a);
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int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t r);
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int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v);
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ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai);
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BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn);
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=head1 DESCRIPTION
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These functions convert to and from B<ASN1_INTEGER> and B<ASN1_ENUMERATED>
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structures.
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ASN1_INTEGER_get_int64() converts an B<ASN1_INTEGER> into an B<int64_t> type
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If successful it returns 1 and sets B<*pr> to the value of B<a>. If it fails
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(due to invalid type or the value being too big to fit into an B<int64_t> type)
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it returns 0.
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ASN1_INTEGER_get_uint64() is similar to ASN1_INTEGER_get_int64_t() except it
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converts to a B<uint64_t> type and an error is returned if the passed integer
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is negative.
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ASN1_INTEGER_get() also returns the value of B<a> but it returns 0 if B<a> is
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NULL and -1 on error (which is ambiguous because -1 is a legitimate value for
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an B<ASN1_INTEGER>). New applications should use ASN1_INTEGER_get_int64()
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instead.
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ASN1_INTEGER_set_int64() sets the value of B<ASN1_INTEGER> B<a> to the
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B<int64_t> value B<r>.
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ASN1_INTEGER_set_uint64() sets the value of B<ASN1_INTEGER> B<a> to the
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B<uint64_t> value B<r>.
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ASN1_INTEGER_set() sets the value of B<ASN1_INTEGER> B<a> to the B<long> value
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B<v>.
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BN_to_ASN1_INTEGER() converts B<BIGNUM> B<bn> to an B<ASN1_INTEGER>. If B<ai>
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is NULL a new B<ASN1_INTEGER> structure is returned. If B<ai> is not NULL then
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the existing structure will be used instead.
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ASN1_INTEGER_to_BN() converts ASN1_INTEGER B<ai> into a B<BIGNUM>. If B<bn> is
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NULL a new B<BIGNUM> structure is returned. If B<bn> is not NULL then the
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existing structure will be used instead.
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ASN1_ENUMERATED_get_int64(), ASN1_ENUMERATED_set_int64(),
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ASN1_ENUMERATED_set(), BN_to_ASN1_ENUMERATED() and ASN1_ENUMERATED_to_BN()
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behave in an identical way to their ASN1_INTEGER counterparts except they
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operate on an B<ASN1_ENUMERATED> value.
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ASN1_ENUMERATED_get() returns the value of B<a> in a similar way to
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ASN1_INTEGER_get() but it returns B<0xffffffffL> if the value of B<a> will not
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fit in a long type. New applications should use ASN1_ENUMERATED_get_int64()
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instead.
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=head1 NOTES
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In general an B<ASN1_INTEGER> or B<ASN1_ENUMERATED> type can contain an
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integer of almost arbitrary size and so cannot always be represented by a C
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B<int64_t> type. However, in many cases (for example version numbers) they
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represent small integers which can be more easily manipulated if converted to
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an appropriate C integer type.
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=head1 BUGS
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The ambiguous return values of ASN1_INTEGER_get() and ASN1_ENUMERATED_get()
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mean these functions should be avoided if possible. They are retained for
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compatibility. Normally the ambiguous return values are not legitimate
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values for the fields they represent.
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=head1 RETURN VALUES
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ASN1_INTEGER_set_int64(), ASN1_INTEGER_set(), ASN1_ENUMERATED_set_int64() and
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ASN1_ENUMERATED_set() return 1 for success and 0 for failure. They will only
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fail if a memory allocation error occurs.
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ASN1_INTEGER_get_int64() and ASN1_ENUMERATED_get_int64() return 1 for success
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and 0 for failure. They will fail if the passed type is incorrect (this will
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only happen if there is a programming error) or if the value exceeds the range
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of an B<int64_t> type.
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BN_to_ASN1_INTEGER() and BN_to_ASN1_ENUMERATED() return an B<ASN1_INTEGER> or
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B<ASN1_ENUMERATED> structure respectively or NULL if an error occurs. They will
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only fail due to a memory allocation error.
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ASN1_INTEGER_to_BN() and ASN1_ENUMERATED_to_BN() return a B<BIGNUM> structure
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of NULL if an error occurs. They can fail if the passed type is incorrect
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(due to programming error) or due to a memory allocation failure.
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=head1 SEE ALSO
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L<ERR_get_error(3)>
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=head1 HISTORY
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ASN1_INTEGER_set_int64(), ASN1_INTEGER_get_int64(),
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ASN1_ENUMERATED_set_int64() and ASN1_ENUMERATED_get_int64()
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were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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