First Commit

externals/libressl/crypto/asn1/a_bitstr.c

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+/* $OpenBSD: a_bitstr.c,v 1.38 2023/01/13 14:46:08 tb Exp $ */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * 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 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 acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS 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 AUTHOR OR 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/conf.h>
+#include <openssl/err.h>
+#include <openssl/x509v3.h>
+
+#include "bytestring.h"
+
+const ASN1_ITEM ASN1_BIT_STRING_it = {
+	.itype = ASN1_ITYPE_PRIMITIVE,
+	.utype = V_ASN1_BIT_STRING,
+	.sname = "ASN1_BIT_STRING",
+};
+
+ASN1_BIT_STRING *
+ASN1_BIT_STRING_new(void)
+{
+	return (ASN1_BIT_STRING *)ASN1_item_new(&ASN1_BIT_STRING_it);
+}
+
+void
+ASN1_BIT_STRING_free(ASN1_BIT_STRING *a)
+{
+	ASN1_item_free((ASN1_VALUE *)a, &ASN1_BIT_STRING_it);
+}
+
+static void
+asn1_abs_clear_unused_bits(ASN1_BIT_STRING *abs)
+{
+	abs->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
+}
+
+int
+asn1_abs_set_unused_bits(ASN1_BIT_STRING *abs, uint8_t unused_bits)
+{
+	if (unused_bits > 7)
+		return 0;
+
+	asn1_abs_clear_unused_bits(abs);
+
+	abs->flags |= ASN1_STRING_FLAG_BITS_LEFT | unused_bits;
+
+	return 1;
+}
+
+int
+ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
+{
+	return ASN1_STRING_set(x, d, len);
+}
+
+int
+ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
+{
+	int w, v, iv;
+	unsigned char *c;
+
+	w = n/8;
+	v = 1 << (7 - (n & 0x07));
+	iv = ~v;
+	if (!value)
+		v = 0;
+
+	if (a == NULL)
+		return 0;
+
+	asn1_abs_clear_unused_bits(a);
+
+	if ((a->length < (w + 1)) || (a->data == NULL)) {
+		if (!value)
+			return(1); /* Don't need to set */
+		if ((c = recallocarray(a->data, a->length, w + 1, 1)) == NULL) {
+			ASN1error(ERR_R_MALLOC_FAILURE);
+			return 0;
+		}
+		a->data = c;
+		a->length = w + 1;
+	}
+	a->data[w] = ((a->data[w]) & iv) | v;
+	while ((a->length > 0) && (a->data[a->length - 1] == 0))
+		a->length--;
+
+	return (1);
+}
+
+int
+ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n)
+{
+	int w, v;
+
+	w = n / 8;
+	v = 1 << (7 - (n & 0x07));
+	if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
+		return (0);
+	return ((a->data[w] & v) != 0);
+}
+
+/*
+ * Checks if the given bit string contains only bits specified by
+ * the flags vector. Returns 0 if there is at least one bit set in 'a'
+ * which is not specified in 'flags', 1 otherwise.
+ * 'len' is the length of 'flags'.
+ */
+int
+ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, const unsigned char *flags,
+    int flags_len)
+{
+	int i, ok;
+
+	/* Check if there is one bit set at all. */
+	if (!a || !a->data)
+		return 1;
+
+	/* Check each byte of the internal representation of the bit string. */
+	ok = 1;
+	for (i = 0; i < a->length && ok; ++i) {
+		unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
+		/* We are done if there is an unneeded bit set. */
+		ok = (a->data[i] & mask) == 0;
+	}
+	return ok;
+}
+
+int
+ASN1_BIT_STRING_name_print(BIO *out, ASN1_BIT_STRING *bs,
+    BIT_STRING_BITNAME *tbl, int indent)
+{
+	BIT_STRING_BITNAME *bnam;
+	char first = 1;
+
+	BIO_printf(out, "%*s", indent, "");
+	for (bnam = tbl; bnam->lname; bnam++) {
+		if (ASN1_BIT_STRING_get_bit(bs, bnam->bitnum)) {
+			if (!first)
+				BIO_puts(out, ", ");
+			BIO_puts(out, bnam->lname);
+			first = 0;
+		}
+	}
+	BIO_puts(out, "\n");
+	return 1;
+}
+
+int
+ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, const char *name, int value,
+    BIT_STRING_BITNAME *tbl)
+{
+	int bitnum;
+
+	bitnum = ASN1_BIT_STRING_num_asc(name, tbl);
+	if (bitnum < 0)
+		return 0;
+	if (bs) {
+		if (!ASN1_BIT_STRING_set_bit(bs, bitnum, value))
+			return 0;
+	}
+	return 1;
+}
+
+int
+ASN1_BIT_STRING_num_asc(const char *name, BIT_STRING_BITNAME *tbl)
+{
+	BIT_STRING_BITNAME *bnam;
+
+	for (bnam = tbl; bnam->lname; bnam++) {
+		if (!strcmp(bnam->sname, name) ||
+		    !strcmp(bnam->lname, name))
+			return bnam->bitnum;
+	}
+	return -1;
+}
+
+int
+i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
+{
+	int ret, j, bits, len;
+	unsigned char *p, *d;
+
+	if (a == NULL)
+		return (0);
+
+	if (a->length == INT_MAX)
+		return (0);
+
+	ret = a->length + 1;
+
+	if (pp == NULL)
+		return (ret);
+
+	len = a->length;
+
+	if (len > 0) {
+		if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
+			bits = (int)a->flags & 0x07;
+		} else {
+			j = 0;
+			for (; len > 0; len--) {
+				if (a->data[len - 1])
+					break;
+			}
+			if (len > 0)
+				j = a->data[len - 1];
+			if (j & 0x01)
+				bits = 0;
+			else if (j & 0x02)
+				bits = 1;
+			else if (j & 0x04)
+				bits = 2;
+			else if (j & 0x08)
+				bits = 3;
+			else if (j & 0x10)
+				bits = 4;
+			else if (j & 0x20)
+				bits = 5;
+			else if (j & 0x40)
+				bits = 6;
+			else if (j & 0x80)
+				bits = 7;
+			else
+				bits = 0; /* should not happen */
+		}
+	} else
+		bits = 0;
+
+	p= *pp;
+
+	*(p++) = (unsigned char)bits;
+	d = a->data;
+	if (len > 0) {
+		memcpy(p, d, len);
+		p += len;
+		p[-1] &= 0xff << bits;
+	}
+	*pp = p;
+	return (ret);
+}
+
+int
+c2i_ASN1_BIT_STRING_cbs(ASN1_BIT_STRING **out_abs, CBS *cbs)
+{
+	ASN1_BIT_STRING *abs = NULL;
+	uint8_t *data = NULL;
+	size_t data_len = 0;
+	uint8_t unused_bits;
+	int ret = 0;
+
+	if (out_abs == NULL)
+		goto err;
+
+	if (*out_abs != NULL) {
+		ASN1_BIT_STRING_free(*out_abs);
+		*out_abs = NULL;
+	}
+
+	if (!CBS_get_u8(cbs, &unused_bits)) {
+		ASN1error(ASN1_R_STRING_TOO_SHORT);
+		goto err;
+	}
+
+	if (!CBS_stow(cbs, &data, &data_len))
+		goto err;
+	if (data_len > INT_MAX)
+		goto err;
+
+	if ((abs = ASN1_BIT_STRING_new()) == NULL)
+		goto err;
+
+	abs->data = data;
+	abs->length = (int)data_len;
+	data = NULL;
+
+	/*
+	 * We do this to preserve the settings. If we modify the settings,
+	 * via the _set_bit function, we will recalculate on output.
+	 */
+	if (!asn1_abs_set_unused_bits(abs, unused_bits)) {
+		ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
+		goto err;
+	}
+	if (abs->length > 0)
+		abs->data[abs->length - 1] &= 0xff << unused_bits;
+
+	*out_abs = abs;
+	abs = NULL;
+
+	ret = 1;
+
+ err:
+	ASN1_BIT_STRING_free(abs);
+	freezero(data, data_len);
+
+	return ret;
+}
+
+ASN1_BIT_STRING *
+c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **out_abs, const unsigned char **pp, long len)
+{
+	ASN1_BIT_STRING *abs = NULL;
+	CBS content;
+
+	if (out_abs != NULL) {
+		ASN1_BIT_STRING_free(*out_abs);
+		*out_abs = NULL;
+	}
+
+	if (len < 0) {
+		ASN1error(ASN1_R_LENGTH_ERROR);
+		return NULL;
+	}
+
+	CBS_init(&content, *pp, len);
+
+	if (!c2i_ASN1_BIT_STRING_cbs(&abs, &content))
+		return NULL;
+
+	*pp = CBS_data(&content);
+
+	if (out_abs != NULL)
+		*out_abs = abs;
+
+	return abs;
+}
+
+int
+i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **out)
+{
+	return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_BIT_STRING_it);
+}
+
+ASN1_BIT_STRING *
+d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **in, long len)
+{
+	return (ASN1_BIT_STRING *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
+	    &ASN1_BIT_STRING_it);
+}