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482 lines
13 KiB
482 lines
13 KiB
/* bio_asn1.c */ |
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/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
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* project. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This product includes cryptographic software written by Eric Young |
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* (eay@cryptsoft.com). This product includes software written by Tim |
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* Hudson (tjh@cryptsoft.com). |
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* |
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*/ |
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/* |
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* Experimental ASN1 BIO. When written through the data is converted to an |
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* ASN1 string type: default is OCTET STRING. Additional functions can be |
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* provided to add prefix and suffix data. |
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*/ |
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#include <string.h> |
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#include <openssl/bio.h> |
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#include <openssl/asn1.h> |
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/* Must be large enough for biggest tag+length */ |
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#define DEFAULT_ASN1_BUF_SIZE 20 |
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typedef enum { |
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ASN1_STATE_START, |
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ASN1_STATE_PRE_COPY, |
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ASN1_STATE_HEADER, |
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ASN1_STATE_HEADER_COPY, |
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ASN1_STATE_DATA_COPY, |
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ASN1_STATE_POST_COPY, |
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ASN1_STATE_DONE |
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} asn1_bio_state_t; |
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typedef struct BIO_ASN1_EX_FUNCS_st { |
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asn1_ps_func *ex_func; |
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asn1_ps_func *ex_free_func; |
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} BIO_ASN1_EX_FUNCS; |
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typedef struct BIO_ASN1_BUF_CTX_t { |
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/* Internal state */ |
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asn1_bio_state_t state; |
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/* Internal buffer */ |
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unsigned char *buf; |
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/* Size of buffer */ |
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int bufsize; |
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/* Current position in buffer */ |
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int bufpos; |
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/* Current buffer length */ |
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int buflen; |
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/* Amount of data to copy */ |
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int copylen; |
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/* Class and tag to use */ |
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int asn1_class, asn1_tag; |
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asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free; |
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/* Extra buffer for prefix and suffix data */ |
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unsigned char *ex_buf; |
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int ex_len; |
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int ex_pos; |
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void *ex_arg; |
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} BIO_ASN1_BUF_CTX; |
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static int asn1_bio_write(BIO *h, const char *buf, int num); |
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static int asn1_bio_read(BIO *h, char *buf, int size); |
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static int asn1_bio_puts(BIO *h, const char *str); |
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static int asn1_bio_gets(BIO *h, char *str, int size); |
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static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
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static int asn1_bio_new(BIO *h); |
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static int asn1_bio_free(BIO *data); |
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static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); |
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static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size); |
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static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, |
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asn1_ps_func *cleanup, asn1_bio_state_t next); |
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static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, |
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asn1_ps_func *setup, |
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asn1_bio_state_t ex_state, |
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asn1_bio_state_t other_state); |
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static BIO_METHOD methods_asn1 = { |
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BIO_TYPE_ASN1, |
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"asn1", |
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asn1_bio_write, |
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asn1_bio_read, |
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asn1_bio_puts, |
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asn1_bio_gets, |
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asn1_bio_ctrl, |
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asn1_bio_new, |
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asn1_bio_free, |
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asn1_bio_callback_ctrl, |
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}; |
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BIO_METHOD *BIO_f_asn1(void) |
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{ |
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return (&methods_asn1); |
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} |
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static int asn1_bio_new(BIO *b) |
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{ |
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BIO_ASN1_BUF_CTX *ctx; |
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ctx = OPENSSL_malloc(sizeof(BIO_ASN1_BUF_CTX)); |
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if (!ctx) |
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return 0; |
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if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) { |
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OPENSSL_free(ctx); |
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return 0; |
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} |
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b->init = 1; |
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b->ptr = (char *)ctx; |
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b->flags = 0; |
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return 1; |
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} |
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static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size) |
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{ |
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ctx->buf = OPENSSL_malloc(size); |
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if (!ctx->buf) |
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return 0; |
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ctx->bufsize = size; |
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ctx->bufpos = 0; |
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ctx->buflen = 0; |
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ctx->copylen = 0; |
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ctx->asn1_class = V_ASN1_UNIVERSAL; |
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ctx->asn1_tag = V_ASN1_OCTET_STRING; |
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ctx->ex_buf = 0; |
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ctx->ex_pos = 0; |
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ctx->ex_len = 0; |
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ctx->state = ASN1_STATE_START; |
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return 1; |
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} |
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static int asn1_bio_free(BIO *b) |
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{ |
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BIO_ASN1_BUF_CTX *ctx; |
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ctx = (BIO_ASN1_BUF_CTX *)b->ptr; |
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if (ctx == NULL) |
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return 0; |
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if (ctx->buf) |
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OPENSSL_free(ctx->buf); |
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OPENSSL_free(ctx); |
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b->init = 0; |
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b->ptr = NULL; |
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b->flags = 0; |
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return 1; |
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} |
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static int asn1_bio_write(BIO *b, const char *in, int inl) |
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{ |
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BIO_ASN1_BUF_CTX *ctx; |
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int wrmax, wrlen, ret; |
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unsigned char *p; |
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if (!in || (inl < 0) || (b->next_bio == NULL)) |
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return 0; |
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ctx = (BIO_ASN1_BUF_CTX *)b->ptr; |
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if (ctx == NULL) |
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return 0; |
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wrlen = 0; |
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ret = -1; |
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for (;;) { |
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switch (ctx->state) { |
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/* Setup prefix data, call it */ |
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case ASN1_STATE_START: |
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if (!asn1_bio_setup_ex(b, ctx, ctx->prefix, |
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ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER)) |
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return 0; |
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break; |
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/* Copy any pre data first */ |
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case ASN1_STATE_PRE_COPY: |
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ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free, |
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ASN1_STATE_HEADER); |
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if (ret <= 0) |
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goto done; |
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break; |
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case ASN1_STATE_HEADER: |
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ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl; |
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OPENSSL_assert(ctx->buflen <= ctx->bufsize); |
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p = ctx->buf; |
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ASN1_put_object(&p, 0, inl, ctx->asn1_tag, ctx->asn1_class); |
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ctx->copylen = inl; |
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ctx->state = ASN1_STATE_HEADER_COPY; |
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break; |
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case ASN1_STATE_HEADER_COPY: |
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ret = BIO_write(b->next_bio, ctx->buf + ctx->bufpos, ctx->buflen); |
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if (ret <= 0) |
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goto done; |
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ctx->buflen -= ret; |
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if (ctx->buflen) |
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ctx->bufpos += ret; |
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else { |
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ctx->bufpos = 0; |
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ctx->state = ASN1_STATE_DATA_COPY; |
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} |
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break; |
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case ASN1_STATE_DATA_COPY: |
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if (inl > ctx->copylen) |
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wrmax = ctx->copylen; |
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else |
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wrmax = inl; |
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ret = BIO_write(b->next_bio, in, wrmax); |
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if (ret <= 0) |
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break; |
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wrlen += ret; |
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ctx->copylen -= ret; |
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in += ret; |
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inl -= ret; |
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if (ctx->copylen == 0) |
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ctx->state = ASN1_STATE_HEADER; |
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if (inl == 0) |
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goto done; |
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break; |
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default: |
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BIO_clear_retry_flags(b); |
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return 0; |
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} |
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} |
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done: |
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BIO_clear_retry_flags(b); |
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BIO_copy_next_retry(b); |
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return (wrlen > 0) ? wrlen : ret; |
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} |
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static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, |
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asn1_ps_func *cleanup, asn1_bio_state_t next) |
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{ |
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int ret; |
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if (ctx->ex_len <= 0) |
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return 1; |
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for (;;) { |
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ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos, ctx->ex_len); |
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if (ret <= 0) |
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break; |
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ctx->ex_len -= ret; |
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if (ctx->ex_len > 0) |
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ctx->ex_pos += ret; |
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else { |
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if (cleanup) |
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cleanup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg); |
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ctx->state = next; |
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ctx->ex_pos = 0; |
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break; |
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} |
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} |
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return ret; |
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} |
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static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, |
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asn1_ps_func *setup, |
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asn1_bio_state_t ex_state, |
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asn1_bio_state_t other_state) |
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{ |
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if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) { |
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BIO_clear_retry_flags(b); |
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return 0; |
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} |
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if (ctx->ex_len > 0) |
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ctx->state = ex_state; |
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else |
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ctx->state = other_state; |
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return 1; |
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} |
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static int asn1_bio_read(BIO *b, char *in, int inl) |
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{ |
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if (!b->next_bio) |
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return 0; |
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return BIO_read(b->next_bio, in, inl); |
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} |
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static int asn1_bio_puts(BIO *b, const char *str) |
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{ |
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return asn1_bio_write(b, str, strlen(str)); |
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} |
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static int asn1_bio_gets(BIO *b, char *str, int size) |
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{ |
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if (!b->next_bio) |
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return 0; |
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return BIO_gets(b->next_bio, str, size); |
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} |
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static long asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
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{ |
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if (b->next_bio == NULL) |
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return (0); |
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return BIO_callback_ctrl(b->next_bio, cmd, fp); |
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} |
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static long asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2) |
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{ |
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BIO_ASN1_BUF_CTX *ctx; |
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BIO_ASN1_EX_FUNCS *ex_func; |
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long ret = 1; |
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ctx = (BIO_ASN1_BUF_CTX *)b->ptr; |
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if (ctx == NULL) |
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return 0; |
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switch (cmd) { |
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case BIO_C_SET_PREFIX: |
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ex_func = arg2; |
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ctx->prefix = ex_func->ex_func; |
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ctx->prefix_free = ex_func->ex_free_func; |
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break; |
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case BIO_C_GET_PREFIX: |
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ex_func = arg2; |
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ex_func->ex_func = ctx->prefix; |
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ex_func->ex_free_func = ctx->prefix_free; |
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break; |
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case BIO_C_SET_SUFFIX: |
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ex_func = arg2; |
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ctx->suffix = ex_func->ex_func; |
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ctx->suffix_free = ex_func->ex_free_func; |
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break; |
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case BIO_C_GET_SUFFIX: |
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ex_func = arg2; |
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ex_func->ex_func = ctx->suffix; |
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ex_func->ex_free_func = ctx->suffix_free; |
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break; |
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case BIO_C_SET_EX_ARG: |
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ctx->ex_arg = arg2; |
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break; |
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case BIO_C_GET_EX_ARG: |
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*(void **)arg2 = ctx->ex_arg; |
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break; |
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case BIO_CTRL_FLUSH: |
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if (!b->next_bio) |
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return 0; |
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/* Call post function if possible */ |
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if (ctx->state == ASN1_STATE_HEADER) { |
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if (!asn1_bio_setup_ex(b, ctx, ctx->suffix, |
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ASN1_STATE_POST_COPY, ASN1_STATE_DONE)) |
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return 0; |
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} |
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if (ctx->state == ASN1_STATE_POST_COPY) { |
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ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free, |
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ASN1_STATE_DONE); |
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if (ret <= 0) |
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return ret; |
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} |
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if (ctx->state == ASN1_STATE_DONE) |
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return BIO_ctrl(b->next_bio, cmd, arg1, arg2); |
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else { |
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BIO_clear_retry_flags(b); |
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return 0; |
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} |
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break; |
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default: |
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if (!b->next_bio) |
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return 0; |
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return BIO_ctrl(b->next_bio, cmd, arg1, arg2); |
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} |
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return ret; |
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} |
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static int asn1_bio_set_ex(BIO *b, int cmd, |
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asn1_ps_func *ex_func, asn1_ps_func *ex_free_func) |
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{ |
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BIO_ASN1_EX_FUNCS extmp; |
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extmp.ex_func = ex_func; |
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extmp.ex_free_func = ex_free_func; |
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return BIO_ctrl(b, cmd, 0, &extmp); |
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} |
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static int asn1_bio_get_ex(BIO *b, int cmd, |
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asn1_ps_func **ex_func, |
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asn1_ps_func **ex_free_func) |
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{ |
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BIO_ASN1_EX_FUNCS extmp; |
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int ret; |
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ret = BIO_ctrl(b, cmd, 0, &extmp); |
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if (ret > 0) { |
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*ex_func = extmp.ex_func; |
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*ex_free_func = extmp.ex_free_func; |
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} |
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return ret; |
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} |
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int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, |
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asn1_ps_func *prefix_free) |
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{ |
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return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free); |
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} |
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int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, |
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asn1_ps_func **pprefix_free) |
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{ |
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return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free); |
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} |
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int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, |
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asn1_ps_func *suffix_free) |
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{ |
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return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free); |
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} |
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int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, |
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asn1_ps_func **psuffix_free) |
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{ |
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return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free); |
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}
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