106 lines
4.9 KiB
C
106 lines
4.9 KiB
C
// Copyright (c) 2014, Google Inc.
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// SPDX-License-Identifier: ISC
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#ifndef OPENSSL_HEADER_BYTESTRING_INTERNAL_H
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#define OPENSSL_HEADER_BYTESTRING_INTERNAL_H
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#include <openssl/base.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// CBS_asn1_ber_to_der reads a BER element from |in|. If it finds
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// indefinite-length elements or constructed strings then it converts the BER
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// data to DER, sets |out| to the converted contents and |*out_storage| to a
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// buffer which the caller must release with |OPENSSL_free|. Otherwise, it sets
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// |out| to the original BER element in |in| and |*out_storage| to NULL.
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// Additionally, |*in| will be advanced over the BER element.
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//
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// This function should successfully process any valid BER input, however it
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// will not convert all of BER's deviations from DER. BER is ambiguous between
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// implicitly-tagged SEQUENCEs of strings and implicitly-tagged constructed
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// strings. Implicitly-tagged strings must be parsed with
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// |CBS_get_ber_implicitly_tagged_string| instead of |CBS_get_asn1|. The caller
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// must also account for BER variations in the contents of a primitive.
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//
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// It returns one on success and zero otherwise.
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OPENSSL_EXPORT int CBS_asn1_ber_to_der(CBS *in, CBS *out,
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uint8_t **out_storage);
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// CBS_get_asn1_implicit_string parses a BER string of primitive type
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// |inner_tag| implicitly-tagged with |outer_tag|. It sets |out| to the
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// contents. If concatenation was needed, it sets |*out_storage| to a buffer
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// which the caller must release with |OPENSSL_free|. Otherwise, it sets
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// |*out_storage| to NULL.
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//
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// This function does not parse all of BER. It requires the string be
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// definite-length. Constructed strings are allowed, but all children of the
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// outermost element must be primitive. The caller should use
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// |CBS_asn1_ber_to_der| before running this function.
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//
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// It returns one on success and zero otherwise.
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OPENSSL_EXPORT int CBS_get_asn1_implicit_string(CBS *in, CBS *out,
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uint8_t **out_storage,
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CBS_ASN1_TAG outer_tag,
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CBS_ASN1_TAG inner_tag);
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// CBB_finish_i2d calls |CBB_finish| on |cbb| which must have been initialized
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// with |CBB_init|. If |outp| is not NULL then the result is written to |*outp|
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// and |*outp| is advanced just past the output. It returns the number of bytes
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// in the result, whether written or not, or a negative value on error. On
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// error, it calls |CBB_cleanup| on |cbb|.
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//
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// This function may be used to help implement legacy i2d ASN.1 functions.
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OPENSSL_EXPORT int CBB_finish_i2d(CBB *cbb, uint8_t **outp);
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// Unicode utilities.
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// The following functions read one Unicode code point from |cbs| with the
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// corresponding encoding and store it in |*out|. They return one on success and
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// zero on error.
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OPENSSL_EXPORT int cbs_get_utf8(CBS *cbs, uint32_t *out);
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OPENSSL_EXPORT int cbs_get_latin1(CBS *cbs, uint32_t *out);
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OPENSSL_EXPORT int cbs_get_ucs2_be(CBS *cbs, uint32_t *out);
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OPENSSL_EXPORT int cbs_get_utf32_be(CBS *cbs, uint32_t *out);
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// cbb_get_utf8_len returns the number of bytes needed to represent |u| in
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// UTF-8.
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OPENSSL_EXPORT size_t cbb_get_utf8_len(uint32_t u);
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// The following functions encode |u| to |cbb| with the corresponding
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// encoding. They return one on success and zero on error.
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OPENSSL_EXPORT int cbb_add_utf8(CBB *cbb, uint32_t u);
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OPENSSL_EXPORT int cbb_add_latin1(CBB *cbb, uint32_t u);
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OPENSSL_EXPORT int cbb_add_ucs2_be(CBB *cbb, uint32_t u);
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OPENSSL_EXPORT int cbb_add_utf32_be(CBB *cbb, uint32_t u);
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// cbs_get_any_asn1_element parses an ASN.1 element from |cbs|. |*out_indefinite|
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// is set to one if the length was indefinite and zero otherwise. On success,
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// if the length is indefinite |out| will only contain the ASN.1 header,
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// otherwise is will contain both the header and the content. If |out_tag| is
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// not NULL, |*out_tag| is set to the element's tag number. If |out_header_len|
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// is not NULL, |*out_header_len| is set to the length of the header.
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//
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// If |ber_ok| is one, BER encoding is permitted. In this case, if
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// |out_ber_found| is not NULL and BER-specific encoding was found,
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// |*out_ber_found| is set to one. If |out_indefinite| is not NULL and the
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// element has indefinite-length, |*out_indefinite| is set to one.
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// If |ber_ok| is zero, both |out_ber_found| and |out_indefinite| must be NULL.
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//
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// If |universal_tag_ok| is 1, universal tags are permitted. Otherwise, only
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// context-specific tags are accepted.
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//
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// It returns one on success and zero on failure.
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int cbs_get_any_asn1_element(CBS *cbs, CBS *out, CBS_ASN1_TAG *out_tag,
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size_t *out_header_len, int *out_ber_found,
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int *out_indefinite, int ber_ok, int universal_tag_ok);
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#if defined(__cplusplus)
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} // extern C
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#endif
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#endif // OPENSSL_HEADER_BYTESTRING_INTERNAL_H
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