diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/asn1/bio_ndef.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/asn1/bio_ndef.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/asn1/bio_ndef.c b/openssl-1.1.0h/crypto/asn1/bio_ndef.c new file mode 100644 index 0000000..0f206b2 --- /dev/null +++ b/openssl-1.1.0h/crypto/asn1/bio_ndef.c @@ -0,0 +1,199 @@ +/* + * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/bio.h> +#include <openssl/err.h> + +#include <stdio.h> + +/* Experimental NDEF ASN1 BIO support routines */ + +/* + * The usage is quite simple, initialize an ASN1 structure, get a BIO from it + * then any data written through the BIO will end up translated to + * appropriate format on the fly. The data is streamed out and does *not* + * need to be all held in memory at once. When the BIO is flushed the output + * is finalized and any signatures etc written out. The BIO is a 'proper' + * BIO and can handle non blocking I/O correctly. The usage is simple. The + * implementation is *not*... + */ + +/* BIO support data stored in the ASN1 BIO ex_arg */ + +typedef struct ndef_aux_st { + /* ASN1 structure this BIO refers to */ + ASN1_VALUE *val; + const ASN1_ITEM *it; + /* Top of the BIO chain */ + BIO *ndef_bio; + /* Output BIO */ + BIO *out; + /* Boundary where content is inserted */ + unsigned char **boundary; + /* DER buffer start */ + unsigned char *derbuf; +} NDEF_SUPPORT; + +static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg); +static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, + void *parg); +static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg); +static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, + void *parg); + +BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it) +{ + NDEF_SUPPORT *ndef_aux = NULL; + BIO *asn_bio = NULL; + const ASN1_AUX *aux = it->funcs; + ASN1_STREAM_ARG sarg; + + if (!aux || !aux->asn1_cb) { + ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED); + return NULL; + } + ndef_aux = OPENSSL_zalloc(sizeof(*ndef_aux)); + asn_bio = BIO_new(BIO_f_asn1()); + if (ndef_aux == NULL || asn_bio == NULL) + goto err; + + /* ASN1 bio needs to be next to output BIO */ + out = BIO_push(asn_bio, out); + if (out == NULL) + goto err; + + BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free); + BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free); + + /* + * Now let callback prepends any digest, cipher etc BIOs ASN1 structure + * needs. + */ + + sarg.out = out; + sarg.ndef_bio = NULL; + sarg.boundary = NULL; + + if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) + goto err; + + ndef_aux->val = val; + ndef_aux->it = it; + ndef_aux->ndef_bio = sarg.ndef_bio; + ndef_aux->boundary = sarg.boundary; + ndef_aux->out = out; + + BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux); + + return sarg.ndef_bio; + + err: + BIO_free(asn_bio); + OPENSSL_free(ndef_aux); + return NULL; +} + +static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg) +{ + NDEF_SUPPORT *ndef_aux; + unsigned char *p; + int derlen; + + if (!parg) + return 0; + + ndef_aux = *(NDEF_SUPPORT **)parg; + + derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); + p = OPENSSL_malloc(derlen); + if (p == NULL) + return 0; + + ndef_aux->derbuf = p; + *pbuf = p; + derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); + + if (!*ndef_aux->boundary) + return 0; + + *plen = *ndef_aux->boundary - *pbuf; + + return 1; +} + +static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, + void *parg) +{ + NDEF_SUPPORT *ndef_aux; + + if (!parg) + return 0; + + ndef_aux = *(NDEF_SUPPORT **)parg; + + OPENSSL_free(ndef_aux->derbuf); + + ndef_aux->derbuf = NULL; + *pbuf = NULL; + *plen = 0; + return 1; +} + +static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, + void *parg) +{ + NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg; + if (!ndef_prefix_free(b, pbuf, plen, parg)) + return 0; + OPENSSL_free(*pndef_aux); + *pndef_aux = NULL; + return 1; +} + +static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg) +{ + NDEF_SUPPORT *ndef_aux; + unsigned char *p; + int derlen; + const ASN1_AUX *aux; + ASN1_STREAM_ARG sarg; + + if (!parg) + return 0; + + ndef_aux = *(NDEF_SUPPORT **)parg; + + aux = ndef_aux->it->funcs; + + /* Finalize structures */ + sarg.ndef_bio = ndef_aux->ndef_bio; + sarg.out = ndef_aux->out; + sarg.boundary = ndef_aux->boundary; + if (aux->asn1_cb(ASN1_OP_STREAM_POST, + &ndef_aux->val, ndef_aux->it, &sarg) <= 0) + return 0; + + derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); + p = OPENSSL_malloc(derlen); + if (p == NULL) + return 0; + + ndef_aux->derbuf = p; + *pbuf = p; + derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); + + if (!*ndef_aux->boundary) + return 0; + *pbuf = *ndef_aux->boundary; + *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf); + + return 1; +} |