369 lines
15 KiB
Plaintext
369 lines
15 KiB
Plaintext
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)
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.\" ========================================================================
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.\"
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.IX Title "ASN1_AUX_CB 3ossl"
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.TH ASN1_AUX_CB 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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ASN1_AUX, ASN1_PRINT_ARG, ASN1_STREAM_ARG, ASN1_aux_cb, ASN1_aux_const_cb
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\&\- ASN.1 auxiliary data
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/asn1t.h>
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\&
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\& struct ASN1_AUX_st {
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\& void *app_data;
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\& int flags;
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\& int ref_offset; /* Offset of reference value */
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\& int ref_lock; /* Offset to an CRYPTO_RWLOCK */
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\& ASN1_aux_cb *asn1_cb;
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\& int enc_offset; /* Offset of ASN1_ENCODING structure */
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\& ASN1_aux_const_cb *asn1_const_cb; /* for ASN1_OP_I2D_ and ASN1_OP_PRINT_ */
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\& };
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\& typedef struct ASN1_AUX_st ASN1_AUX;
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\&
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\& struct ASN1_PRINT_ARG_st {
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\& BIO *out;
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\& int indent;
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\& const ASN1_PCTX *pctx;
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\& };
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\& typedef struct ASN1_PRINT_ARG_st ASN1_PRINT_ARG;
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\&
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\& struct ASN1_STREAM_ARG_st {
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\& BIO *out;
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\& BIO *ndef_bio;
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\& unsigned char **boundary;
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\& };
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\& typedef struct ASN1_STREAM_ARG_st ASN1_STREAM_ARG;
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\&
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\& typedef int ASN1_aux_cb(int operation, ASN1_VALUE **in, const ASN1_ITEM *it,
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\& void *exarg);
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\& typedef int ASN1_aux_const_cb(int operation, const ASN1_VALUE **in,
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\& const ASN1_ITEM *it, void *exarg);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\s-1ASN.1\s0 data structures can be associated with an \fB\s-1ASN1_AUX\s0\fR object to supply
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additional information about the \s-1ASN.1\s0 structure. An \fB\s-1ASN1_AUX\s0\fR structure is
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associated with the structure during the definition of the \s-1ASN.1\s0 template. For
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example an \fB\s-1ASN1_AUX\s0\fR structure will be associated by using one of the various
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\&\s-1ASN.1\s0 template definition macros that supply auxiliary information such as
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\&\fIASN1_SEQUENCE_enc()\fR, \fIASN1_SEQUENCE_ref()\fR, \fIASN1_SEQUENCE_cb_const_cb()\fR,
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\&\fIASN1_SEQUENCE_const_cb()\fR, \fIASN1_SEQUENCE_cb()\fR or \fIASN1_NDEF_SEQUENCE_cb()\fR.
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.PP
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An \fB\s-1ASN1_AUX\s0\fR structure contains the following information.
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.IP "\fIapp_data\fR" 4
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.IX Item "app_data"
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Arbitrary application data
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.IP "\fIflags\fR" 4
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.IX Item "flags"
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Flags which indicate the auxiliarly functionality supported.
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.Sp
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The \fB\s-1ASN1_AFLG_REFCOUNT\s0\fR flag indicates that objects support reference counting.
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.Sp
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The \fB\s-1ASN1_AFLG_ENCODING\s0\fR flag indicates that the original encoding of the
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object will be saved.
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.Sp
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The \fB\s-1ASN1_AFLG_BROKEN\s0\fR flag is a work around for broken encoders where the
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sequence length value may not be correct. This should generally not be used.
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.Sp
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The \fB\s-1ASN1_AFLG_CONST_CB\s0\fR flag indicates that the \*(L"const\*(R" form of the
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\&\fB\s-1ASN1_AUX\s0\fR callback should be used in preference to the non-const form.
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.IP "\fIref_offset\fR" 4
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.IX Item "ref_offset"
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If the \fB\s-1ASN1_AFLG_REFCOUNT\s0\fR flag is set then this value is assumed to be an
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offset into the \fB\s-1ASN1_VALUE\s0\fR structure where a \fB\s-1CRYPTO_REF_COUNT\s0\fR may be
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found for the purposes of reference counting.
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.IP "\fIref_lock\fR" 4
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.IX Item "ref_lock"
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If the \fB\s-1ASN1_AFLG_REFCOUNT\s0\fR flag is set then this value is assumed to be an
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offset into the \fB\s-1ASN1_VALUE\s0\fR structure where a \fB\s-1CRYPTO_RWLOCK\s0\fR may be
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found for the purposes of reference counting.
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.IP "\fIasn1_cb\fR" 4
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.IX Item "asn1_cb"
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A callback that will be invoked at various points during the processing of
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the the \fB\s-1ASN1_VALLUE\s0\fR. See below for further details.
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.IP "\fIenc_offset\fR" 4
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.IX Item "enc_offset"
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Offset into the \fB\s-1ASN1_VALUE\s0\fR object where the original encoding of the object
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will be saved if the \fB\s-1ASN1_AFLG_ENCODING\s0\fR flag has been set.
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.IP "\fIasn1_const_cb\fR" 4
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.IX Item "asn1_const_cb"
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A callback that will be invoked at various points during the processing of
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the the \fB\s-1ASN1_VALLUE\s0\fR. This is used in preference to the \fIasn1_cb\fR callback if
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the \fB\s-1ASN1_AFLG_CONST_CB\s0\fR flag is set. See below for further details.
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.PP
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During the processing of an \fB\s-1ASN1_VALUE\s0\fR object the callbacks set via
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\&\fIasn1_cb\fR or \fIasn1_const_cb\fR will be invoked as a result of various events
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indicated via the \fIoperation\fR parameter. The value of \fI*in\fR will be the
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\&\fB\s-1ASN1_VALUE\s0\fR object being processed based on the template in \fIit\fR. An
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additional operation specific parameter may be passed in \fIexarg\fR. The currently
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supported operations are as follows. The callbacks should return a positive
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value on success or zero on error, unless otherwise noted below.
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.IP "\fB\s-1ASN1_OP_NEW_PRE\s0\fR" 4
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.IX Item "ASN1_OP_NEW_PRE"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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prior to an \fB\s-1ASN1_VALUE\s0\fR object being allocated. The callback may allocate the
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\&\fB\s-1ASN1_VALUE\s0\fR itself and store it in \fI*pval\fR. If it does so it should return 2
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from the callback. On error it should return 0.
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.IP "\fB\s-1ASN1_OP_NEW_POST\s0\fR" 4
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.IX Item "ASN1_OP_NEW_POST"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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after an \fB\s-1ASN1_VALUE\s0\fR object has been allocated. The allocated object is in
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\&\fI*pval\fR.
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.IP "\fB\s-1ASN1_OP_FREE_PRE\s0\fR" 4
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.IX Item "ASN1_OP_FREE_PRE"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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immediately before an \fB\s-1ASN1_VALUE\s0\fR is freed. If the callback originally
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constructed the \fB\s-1ASN1_VALUE\s0\fR via \fB\s-1ASN1_OP_NEW_PRE\s0\fR then it should free it at
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this point and return 2 from the callback. Otherwise it should return 1 for
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success or 0 on error.
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.IP "\fB\s-1ASN1_OP_FREE_POST\s0\fR" 4
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.IX Item "ASN1_OP_FREE_POST"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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immediately after \fB\s-1ASN1_VALUE\s0\fR sub-structures are freed.
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.IP "\fB\s-1ASN1_OP_D2I_PRE\s0\fR" 4
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.IX Item "ASN1_OP_D2I_PRE"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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immediately before a \*(L"d2i\*(R" operation for the \fB\s-1ASN1_VALUE\s0\fR.
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.IP "\fB\s-1ASN1_OP_D2I_POST\s0\fR" 4
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.IX Item "ASN1_OP_D2I_POST"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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immediately after a \*(L"d2i\*(R" operation for the \fB\s-1ASN1_VALUE\s0\fR.
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.IP "\fB\s-1ASN1_OP_I2D_PRE\s0\fR" 4
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.IX Item "ASN1_OP_I2D_PRE"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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immediately before a \*(L"i2d\*(R" operation for the \fB\s-1ASN1_VALUE\s0\fR.
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.IP "\fB\s-1ASN1_OP_I2D_POST\s0\fR" 4
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.IX Item "ASN1_OP_I2D_POST"
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Invoked when processing a \fB\s-1CHOICE\s0\fR, \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure
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immediately after a \*(L"i2d\*(R" operation for the \fB\s-1ASN1_VALUE\s0\fR.
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.IP "\fB\s-1ASN1_OP_PRINT_PRE\s0\fR" 4
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.IX Item "ASN1_OP_PRINT_PRE"
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Invoked when processing a \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure immediately
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before printing the \fB\s-1ASN1_VALUE\s0\fR. The \fIexarg\fR argument will be a pointer to an
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\&\fB\s-1ASN1_PRINT_ARG\s0\fR structure (see below).
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.IP "\fB\s-1ASN1_OP_PRINT_POST\s0\fR" 4
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.IX Item "ASN1_OP_PRINT_POST"
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Invoked when processing a \fB\s-1SEQUENCE\s0\fR or \fB\s-1NDEF_SEQUENCE\s0\fR structure immediately
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after printing the \fB\s-1ASN1_VALUE\s0\fR. The \fIexarg\fR argument will be a pointer to an
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\&\fB\s-1ASN1_PRINT_ARG\s0\fR structure (see below).
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.IP "\fB\s-1ASN1_OP_STREAM_PRE\s0\fR" 4
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.IX Item "ASN1_OP_STREAM_PRE"
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Invoked immediately prior to streaming the \fB\s-1ASN1_VALUE\s0\fR data using indefinite
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length encoding. The \fIexarg\fR argument will be a pointer to a \fB\s-1ASN1_STREAM_ARG\s0\fR
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structure (see below).
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.IP "\fB\s-1ASN1_OP_STREAM_POST\s0\fR" 4
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.IX Item "ASN1_OP_STREAM_POST"
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Invoked immediately after streaming the \fB\s-1ASN1_VALUE\s0\fR data using indefinite
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length encoding. The \fIexarg\fR argument will be a pointer to a \fB\s-1ASN1_STREAM_ARG\s0\fR
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structure (see below).
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.IP "\fB\s-1ASN1_OP_DETACHED_PRE\s0\fR" 4
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.IX Item "ASN1_OP_DETACHED_PRE"
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Invoked immediately prior to processing the \fB\s-1ASN1_VALUE\s0\fR data as a \*(L"detached\*(R"
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value (as used in \s-1CMS\s0 and \s-1PKCS7\s0). The \fIexarg\fR argument will be a pointer to a
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\&\fB\s-1ASN1_STREAM_ARG\s0\fR structure (see below).
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.IP "\fB\s-1ASN1_OP_DETACHED_POST\s0\fR" 4
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.IX Item "ASN1_OP_DETACHED_POST"
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Invoked immediately after processing the \fB\s-1ASN1_VALUE\s0\fR data as a \*(L"detached\*(R"
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value (as used in \s-1CMS\s0 and \s-1PKCS7\s0). The \fIexarg\fR argument will be a pointer to a
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\&\fB\s-1ASN1_STREAM_ARG\s0\fR structure (see below).
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.IP "\fB\s-1ASN1_OP_DUP_PRE\s0\fR" 4
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.IX Item "ASN1_OP_DUP_PRE"
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Invoked immediate prior to an \s-1ASN1_VALUE\s0 being duplicated via a call to
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\&\fIASN1_item_dup()\fR.
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.IP "\fB\s-1ASN1_OP_DUP_POST\s0\fR" 4
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.IX Item "ASN1_OP_DUP_POST"
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Invoked immediate after to an \s-1ASN1_VALUE\s0 has been duplicated via a call to
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\&\fIASN1_item_dup()\fR.
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.IP "\fB\s-1ASN1_OP_GET0_LIBCTX\s0\fR" 4
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.IX Item "ASN1_OP_GET0_LIBCTX"
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Invoked in order to obtain the \fB\s-1OSSL_LIB_CTX\s0\fR associated with an \fB\s-1ASN1_VALUE\s0\fR
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if any. A pointer to an \fB\s-1OSSL_LIB_CTX\s0\fR should be stored in \fI*exarg\fR if such
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a value exists.
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.IP "\fB\s-1ASN1_OP_GET0_PROPQ\s0\fR" 4
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.IX Item "ASN1_OP_GET0_PROPQ"
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Invoked in order to obtain the property query string associated with an
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\&\fB\s-1ASN1_VALUE\s0\fR if any. A pointer to the property query string should be stored in
|
|
\&\fI*exarg\fR if such a value exists.
|
|
.PP
|
|
An \fB\s-1ASN1_PRINT_ARG\s0\fR object is used during processing of \fB\s-1ASN1_OP_PRINT_PRE\s0\fR
|
|
and \fB\s-1ASN1_OP_PRINT_POST\s0\fR callback operations. It contains the following
|
|
information.
|
|
.IP "\fIout\fR" 4
|
|
.IX Item "out"
|
|
The \fB\s-1BIO\s0\fR being used to print the data out.
|
|
.IP "\fIndef_bio\fR" 4
|
|
.IX Item "ndef_bio"
|
|
The current number of indent spaces that should be used for printing this data.
|
|
.IP "\fIpctx\fR" 4
|
|
.IX Item "pctx"
|
|
The context for the \fB\s-1ASN1_PCTX\s0\fR operation.
|
|
.PP
|
|
An \fB\s-1ASN1_STREAM_ARG\s0\fR object is used during processing of \fB\s-1ASN1_OP_STREAM_PRE\s0\fR,
|
|
\&\fB\s-1ASN1_OP_STREAM_POST\s0\fR, \fB\s-1ASN1_OP_DETACHED_PRE\s0\fR and \fB\s-1ASN1_OP_DETACHED_POST\s0\fR
|
|
callback operations. It contains the following information.
|
|
.IP "\fIout\fR" 4
|
|
.IX Item "out"
|
|
The \fB\s-1BIO\s0\fR to stream through
|
|
.IP "\fIndef_bio\fR" 4
|
|
.IX Item "ndef_bio"
|
|
The \fB\s-1BIO\s0\fR with filters appended
|
|
.IP "\fIboundary\fR" 4
|
|
.IX Item "boundary"
|
|
The streaming I/O boundary.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
The callbacks return 0 on error and a positive value on success. Some operations
|
|
require specific positive success values as noted above.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIASN1_item_new_ex\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
The \fIASN1_aux_const_cb()\fR callback and the \fB\s-1ASN1_OP_GET0_LIBCTX\s0\fR and
|
|
\&\fB\s-1ASN1_OP_GET0_PROPQ\s0\fR operation types were added in OpenSSL 3.0.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2021\-2022 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|