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