/src/boringssl/crypto/asn1/a_int.c

Source (jump to first uncovered line)
/* 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 <openssl/asn1.h>

#include <assert.h>
#include <limits.h>
#include <string.h>

#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/mem.h>

#include "../internal.h"


ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x) {
  return ASN1_STRING_dup(x);
}

int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y) {
  // Compare signs.
  int neg = x->type & V_ASN1_NEG;
  if (neg != (y->type & V_ASN1_NEG)) {
    return neg ? -1 : 1;
  }

  int ret = ASN1_STRING_cmp(x, y);
  if (neg) {
    // This could be |-ret|, but |ASN1_STRING_cmp| is not forbidden from
    // returning |INT_MIN|.
    if (ret < 0) {
      return 1;
    } else if (ret > 0) {
      return -1;
    } else {
      return 0;
    }
  }

  return ret;
}

// negate_twos_complement negates |len| bytes from |buf| in-place, interpreted
// as a signed, big-endian two's complement value.
static void negate_twos_complement(uint8_t *buf, size_t len) {
  uint8_t borrow = 0;
  for (size_t i = len - 1; i < len; i--) {
    uint8_t t = buf[i];
    buf[i] = 0u - borrow - t;
    borrow |= t != 0;
  }
}

static int is_all_zeros(const uint8_t *in, size_t len) {
  for (size_t i = 0; i < len; i++) {
    if (in[i] != 0) {
      return 0;
    }
  }
  return 1;
}

int i2c_ASN1_INTEGER(const ASN1_INTEGER *in, unsigned char **outp) {
  if (in == NULL) {
    return 0;
  }

  // |ASN1_INTEGER|s should be represented minimally, but it is possible to
  // construct invalid ones. Skip leading zeros so this does not produce an
  // invalid encoding or break invariants.
  CBS cbs;
  CBS_init(&cbs, in->data, in->length);
  while (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0) {
    CBS_skip(&cbs, 1);
  }

  int is_negative = (in->type & V_ASN1_NEG) != 0;
  size_t pad;
  CBS copy = cbs;
  uint8_t msb;
  if (!CBS_get_u8(&copy, &msb)) {
    // Zero is represented as a single byte.
    is_negative = 0;
    pad = 1;
  } else if (is_negative) {
    // 0x80...01 through 0xff...ff have a two's complement of 0x7f...ff
    // through 0x00...01 and need an extra byte to be negative.
    // 0x01...00 through 0x80...00 have a two's complement of 0xfe...ff
    // through 0x80...00 and can be negated as-is.
    pad = msb > 0x80 ||
          (msb == 0x80 && !is_all_zeros(CBS_data(&copy), CBS_len(&copy)));
  } else {
    // If the high bit is set, the signed representation needs an extra
    // byte to be positive.
    pad = (msb & 0x80) != 0;
  }

  if (CBS_len(&cbs) > INT_MAX - pad) {
    OPENSSL_PUT_ERROR(ASN1, ERR_R_OVERFLOW);
    return 0;
  }
  int len = (int)(pad + CBS_len(&cbs));
  assert(len > 0);
  if (outp == NULL) {
    return len;
  }

  if (pad) {
    (*outp)[0] = 0;
  }
  OPENSSL_memcpy(*outp + pad, CBS_data(&cbs), CBS_len(&cbs));
  if (is_negative) {
    negate_twos_complement(*outp, len);
    assert((*outp)[0] >= 0x80);
  } else {
    assert((*outp)[0] < 0x80);
  }
  *outp += len;
  return len;
}

ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **out, const unsigned char **inp,
                               long len) {
  // This function can handle lengths up to INT_MAX - 1, but the rest of the
  // legacy ASN.1 code mixes integer types, so avoid exposing it to
  // ASN1_INTEGERS with larger lengths.
  if (len < 0 || len > INT_MAX / 2) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
    return NULL;
  }

  CBS cbs;
  CBS_init(&cbs, *inp, (size_t)len);
  int is_negative;
  if (!CBS_is_valid_asn1_integer(&cbs, &is_negative)) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
    return NULL;
  }

  ASN1_INTEGER *ret = NULL;
  if (out == NULL || *out == NULL) {
    ret = ASN1_INTEGER_new();
    if (ret == NULL) {
      return NULL;
    }
  } else {
    ret = *out;
  }

  // Convert to |ASN1_INTEGER|'s sign-and-magnitude representation. First,
  // determine the size needed for a minimal result.
  if (is_negative) {
    // 0xff00...01 through 0xff7f..ff have a two's complement of 0x00ff...ff
    // through 0x000100...001 and need one leading zero removed. 0x8000...00
    // through 0xff00...00 have a two's complement of 0x8000...00 through
    // 0x0100...00 and will be minimally-encoded as-is.
    if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0xff &&
        !is_all_zeros(CBS_data(&cbs) + 1, CBS_len(&cbs) - 1)) {
      CBS_skip(&cbs, 1);
    }
  } else {
    // Remove the leading zero byte, if any.
    if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0x00) {
      CBS_skip(&cbs, 1);
    }
  }

  if (!ASN1_STRING_set(ret, CBS_data(&cbs), CBS_len(&cbs))) {
    goto err;
  }

  if (is_negative) {
    ret->type = V_ASN1_NEG_INTEGER;
    negate_twos_complement(ret->data, ret->length);
  } else {
    ret->type = V_ASN1_INTEGER;
  }

  // The value should be minimally-encoded.
  assert(ret->length == 0 || ret->data[0] != 0);
  // Zero is not negative.
  assert(!is_negative || ret->length > 0);

  *inp += len;
  if (out != NULL) {
    *out = ret;
  }
  return ret;

err:
  if (ret != NULL && (out == NULL || *out != ret)) {
    ASN1_INTEGER_free(ret);
  }
  return NULL;
}

int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t v) {
  if (v >= 0) {
    return ASN1_INTEGER_set_uint64(a, (uint64_t)v);
  }

  if (!ASN1_INTEGER_set_uint64(a, 0 - (uint64_t)v)) {
    return 0;
  }

  a->type = V_ASN1_NEG_INTEGER;
  return 1;
}

int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t v) {
  if (v >= 0) {
    return ASN1_ENUMERATED_set_uint64(a, (uint64_t)v);
  }

  if (!ASN1_ENUMERATED_set_uint64(a, 0 - (uint64_t)v)) {
    return 0;
  }

  a->type = V_ASN1_NEG_ENUMERATED;
  return 1;
}

int ASN1_INTEGER_set(ASN1_INTEGER *a, long v) {
  static_assert(sizeof(long) <= sizeof(int64_t), "long fits in int64_t");
  return ASN1_INTEGER_set_int64(a, v);
}

int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) {
  static_assert(sizeof(long) <= sizeof(int64_t), "long fits in int64_t");
  return ASN1_ENUMERATED_set_int64(a, v);
}

static int asn1_string_set_uint64(ASN1_STRING *out, uint64_t v, int type) {
  uint8_t buf[sizeof(uint64_t)];
  CRYPTO_store_u64_be(buf, v);
  size_t leading_zeros;
  for (leading_zeros = 0; leading_zeros < sizeof(buf); leading_zeros++) {
    if (buf[leading_zeros] != 0) {
      break;
    }
  }

  if (!ASN1_STRING_set(out, buf + leading_zeros, sizeof(buf) - leading_zeros)) {
    return 0;
  }
  out->type = type;
  return 1;
}

int ASN1_INTEGER_set_uint64(ASN1_INTEGER *out, uint64_t v) {
  return asn1_string_set_uint64(out, v, V_ASN1_INTEGER);
}

int ASN1_ENUMERATED_set_uint64(ASN1_ENUMERATED *out, uint64_t v) {
  return asn1_string_set_uint64(out, v, V_ASN1_ENUMERATED);
}

static int asn1_string_get_abs_uint64(uint64_t *out, const ASN1_STRING *a,
                                      int type) {
  if ((a->type & ~V_ASN1_NEG) != type) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
    return 0;
  }
  uint8_t buf[sizeof(uint64_t)] = {0};
  if (a->length > (int)sizeof(buf)) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
    return 0;
  }
  OPENSSL_memcpy(buf + sizeof(buf) - a->length, a->data, a->length);
  *out = CRYPTO_load_u64_be(buf);
  return 1;
}

static int asn1_string_get_uint64(uint64_t *out, const ASN1_STRING *a,
                                  int type) {
  if (!asn1_string_get_abs_uint64(out, a, type)) {
    return 0;
  }
  if (a->type & V_ASN1_NEG) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
    return 0;
  }
  return 1;
}

int ASN1_INTEGER_get_uint64(uint64_t *out, const ASN1_INTEGER *a) {
  return asn1_string_get_uint64(out, a, V_ASN1_INTEGER);
}

int ASN1_ENUMERATED_get_uint64(uint64_t *out, const ASN1_ENUMERATED *a) {
  return asn1_string_get_uint64(out, a, V_ASN1_ENUMERATED);
}

static int asn1_string_get_int64(int64_t *out, const ASN1_STRING *a, int type) {
  uint64_t v;
  if (!asn1_string_get_abs_uint64(&v, a, type)) {
    return 0;
  }
  int64_t i64;
  int fits_in_i64;
  // Check |v != 0| to handle manually-constructed negative zeros.
  if ((a->type & V_ASN1_NEG) && v != 0) {
    i64 = (int64_t)(0u - v);
    fits_in_i64 = i64 < 0;
  } else {
    i64 = (int64_t)v;
    fits_in_i64 = i64 >= 0;
  }
  if (!fits_in_i64) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
    return 0;
  }
  *out = i64;
  return 1;
}

int ASN1_INTEGER_get_int64(int64_t *out, const ASN1_INTEGER *a) {
  return asn1_string_get_int64(out, a, V_ASN1_INTEGER);
}

int ASN1_ENUMERATED_get_int64(int64_t *out, const ASN1_ENUMERATED *a) {
  return asn1_string_get_int64(out, a, V_ASN1_ENUMERATED);
}

static long asn1_string_get_long(const ASN1_STRING *a, int type) {
  if (a == NULL) {
    return 0;
  }

  int64_t v;
  if (!asn1_string_get_int64(&v, a, type) ||  //
      v < LONG_MIN || v > LONG_MAX) {
    // This function's return value does not distinguish overflow from -1.
    ERR_clear_error();
    return -1;
  }

  return (long)v;
}

long ASN1_INTEGER_get(const ASN1_INTEGER *a) {
  return asn1_string_get_long(a, V_ASN1_INTEGER);
}

long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a) {
  return asn1_string_get_long(a, V_ASN1_ENUMERATED);
}

static ASN1_STRING *bn_to_asn1_string(const BIGNUM *bn, ASN1_STRING *ai,
                                      int type) {
  ASN1_INTEGER *ret;
  if (ai == NULL) {
    ret = ASN1_STRING_type_new(type);
  } else {
    ret = ai;
  }
  if (ret == NULL) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
    goto err;
  }

  if (BN_is_negative(bn) && !BN_is_zero(bn)) {
    ret->type = type | V_ASN1_NEG;
  } else {
    ret->type = type;
  }

  int len = BN_num_bytes(bn);
  if (!ASN1_STRING_set(ret, NULL, len) ||
      !BN_bn2bin_padded(ret->data, len, bn)) {
    goto err;
  }
  return ret;

err:
  if (ret != ai) {
    ASN1_STRING_free(ret);
  }
  return NULL;
}

ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai) {
  return bn_to_asn1_string(bn, ai, V_ASN1_INTEGER);
}

ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai) {
  return bn_to_asn1_string(bn, ai, V_ASN1_ENUMERATED);
}

static BIGNUM *asn1_string_to_bn(const ASN1_STRING *ai, BIGNUM *bn, int type) {
  if ((ai->type & ~V_ASN1_NEG) != type) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
    return NULL;
  }

  BIGNUM *ret;
  if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
  } else if (ai->type & V_ASN1_NEG) {
    BN_set_negative(ret, 1);
  }
  return ret;
}

BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn) {
  return asn1_string_to_bn(ai, bn, V_ASN1_INTEGER);
}

BIGNUM *ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn) {
  return asn1_string_to_bn(ai, bn, V_ASN1_ENUMERATED);
}

Coverage Report

Created: 2024-11-21 07:03

Line	Count	Source (jump to first uncovered line)
1		/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2		* All rights reserved.
3		*
4		* This package is an SSL implementation written
5		* by Eric Young (eay@cryptsoft.com).
6		* The implementation was written so as to conform with Netscapes SSL.
7		*
8		* This library is free for commercial and non-commercial use as long as
9		* the following conditions are aheared to. The following conditions
10		* apply to all code found in this distribution, be it the RC4, RSA,
11		* lhash, DES, etc., code; not just the SSL code. The SSL documentation
12		* included with this distribution is covered by the same copyright terms
13		* except that the holder is Tim Hudson (tjh@cryptsoft.com).
14		*
15		* Copyright remains Eric Young's, and as such any Copyright notices in
16		* the code are not to be removed.
17		* If this package is used in a product, Eric Young should be given attribution
18		* as the author of the parts of the library used.
19		* This can be in the form of a textual message at program startup or
20		* in documentation (online or textual) provided with the package.
21		*
22		* Redistribution and use in source and binary forms, with or without
23		* modification, are permitted provided that the following conditions
24		* are met:
25		* 1. Redistributions of source code must retain the copyright
26		* notice, this list of conditions and the following disclaimer.
27		* 2. Redistributions in binary form must reproduce the above copyright
28		* notice, this list of conditions and the following disclaimer in the
29		* documentation and/or other materials provided with the distribution.
30		* 3. All advertising materials mentioning features or use of this software
31		* must display the following acknowledgement:
32		* "This product includes cryptographic software written by
33		* Eric Young (eay@cryptsoft.com)"
34		* The word 'cryptographic' can be left out if the rouines from the library
35		* being used are not cryptographic related :-).
36		* 4. If you include any Windows specific code (or a derivative thereof) from
37		* the apps directory (application code) you must include an acknowledgement:
38		* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39		*
40		* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43		* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50		* SUCH DAMAGE.
51		*
52		* The licence and distribution terms for any publically available version or
53		* derivative of this code cannot be changed. i.e. this code cannot simply be
54		* copied and put under another distribution licence
55		* [including the GNU Public Licence.] */
56
57		#include <openssl/asn1.h>
58
59		#include <assert.h>
60		#include <limits.h>
61		#include <string.h>
62
63		#include <openssl/bytestring.h>
64		#include <openssl/err.h>
65		#include <openssl/mem.h>
66
67		#include "../internal.h"
68
69
70	0	ASN1_INTEGER ASN1_INTEGER_dup(const ASN1_INTEGER x) {
71	0	return ASN1_STRING_dup(x);
72	0	}
73
74	0	int ASN1_INTEGER_cmp(const ASN1_INTEGER x, const ASN1_INTEGER y) {
75		// Compare signs.
76	0	int neg = x->type & V_ASN1_NEG;
77	0	if (neg != (y->type & V_ASN1_NEG)) {
78	0	return neg ? -1 : 1;
79	0	}
80
81	0	int ret = ASN1_STRING_cmp(x, y);
82	0	if (neg) {
83		// This could be \|-ret\|, but \|ASN1_STRING_cmp\| is not forbidden from
84		// returning \|INT_MIN\|.
85	0	if (ret < 0) {
86	0	return 1;
87	0	} else if (ret > 0) {
88	0	return -1;
89	0	} else {
90	0	return 0;
91	0	}
92	0	}
93
94	0	return ret;
95	0	}
96
97		// negate_twos_complement negates \|len\| bytes from \|buf\| in-place, interpreted
98		// as a signed, big-endian two's complement value.
99	0	static void negate_twos_complement(uint8_t *buf, size_t len) {
100	0	uint8_t borrow = 0;
101	0	for (size_t i = len - 1; i < len; i--) {
102	0	uint8_t t = buf[i];
103	0	buf[i] = 0u - borrow - t;
104	0	borrow \|= t != 0;
105	0	}
106	0	}
107
108	0	static int is_all_zeros(const uint8_t *in, size_t len) {
109	0	for (size_t i = 0; i < len; i++) {
110	0	if (in[i] != 0) {
111	0	return 0;
112	0	}
113	0	}
114	0	return 1;
115	0	}
116
117	0	int i2c_ASN1_INTEGER(const ASN1_INTEGER in, unsigned char *outp) {
118	0	if (in == NULL) {
119	0	return 0;
120	0	}
121
122		// \|ASN1_INTEGER\|s should be represented minimally, but it is possible to
123		// construct invalid ones. Skip leading zeros so this does not produce an
124		// invalid encoding or break invariants.
125	0	CBS cbs;
126	0	CBS_init(&cbs, in->data, in->length);
127	0	while (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0) {
128	0	CBS_skip(&cbs, 1);
129	0	}
130
131	0	int is_negative = (in->type & V_ASN1_NEG) != 0;
132	0	size_t pad;
133	0	CBS copy = cbs;
134	0	uint8_t msb;
135	0	if (!CBS_get_u8(&copy, &msb)) {
136		// Zero is represented as a single byte.
137	0	is_negative = 0;
138	0	pad = 1;
139	0	} else if (is_negative) {
140		// 0x80...01 through 0xff...ff have a two's complement of 0x7f...ff
141		// through 0x00...01 and need an extra byte to be negative.
142		// 0x01...00 through 0x80...00 have a two's complement of 0xfe...ff
143		// through 0x80...00 and can be negated as-is.
144	0	pad = msb > 0x80 \|\|
145	0	(msb == 0x80 && !is_all_zeros(CBS_data(&copy), CBS_len(&copy)));
146	0	} else {
147		// If the high bit is set, the signed representation needs an extra
148		// byte to be positive.
149	0	pad = (msb & 0x80) != 0;
150	0	}
151
152	0	if (CBS_len(&cbs) > INT_MAX - pad) {
153	0	OPENSSL_PUT_ERROR(ASN1, ERR_R_OVERFLOW);
154	0	return 0;
155	0	}
156	0	int len = (int)(pad + CBS_len(&cbs));
157	0	assert(len > 0);
158	0	if (outp == NULL) {
159	0	return len;
160	0	}
161
162	0	if (pad) {
163	0	(*outp)[0] = 0;
164	0	}
165	0	OPENSSL_memcpy(*outp + pad, CBS_data(&cbs), CBS_len(&cbs));
166	0	if (is_negative) {
167	0	negate_twos_complement(*outp, len);
168	0	assert((*outp)[0] >= 0x80);
169	0	} else {
170	0	assert((*outp)[0] < 0x80);
171	0	}
172	0	*outp += len;
173	0	return len;
174	0	}
175
176		ASN1_INTEGER c2i_ASN1_INTEGER(ASN1_INTEGER out, const unsigned char *inp,
177	0	long len) {
178		// This function can handle lengths up to INT_MAX - 1, but the rest of the
179		// legacy ASN.1 code mixes integer types, so avoid exposing it to
180		// ASN1_INTEGERS with larger lengths.
181	0	if (len < 0 \|\| len > INT_MAX / 2) {
182	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
183	0	return NULL;
184	0	}
185
186	0	CBS cbs;
187	0	CBS_init(&cbs, *inp, (size_t)len);
188	0	int is_negative;
189	0	if (!CBS_is_valid_asn1_integer(&cbs, &is_negative)) {
190	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
191	0	return NULL;
192	0	}
193
194	0	ASN1_INTEGER *ret = NULL;
195	0	if (out == NULL \|\| *out == NULL) {
196	0	ret = ASN1_INTEGER_new();
197	0	if (ret == NULL) {
198	0	return NULL;
199	0	}
200	0	} else {
201	0	ret = *out;
202	0	}
203
204		// Convert to \|ASN1_INTEGER\|'s sign-and-magnitude representation. First,
205		// determine the size needed for a minimal result.
206	0	if (is_negative) {
207		// 0xff00...01 through 0xff7f..ff have a two's complement of 0x00ff...ff
208		// through 0x000100...001 and need one leading zero removed. 0x8000...00
209		// through 0xff00...00 have a two's complement of 0x8000...00 through
210		// 0x0100...00 and will be minimally-encoded as-is.
211	0	if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0xff &&
212	0	!is_all_zeros(CBS_data(&cbs) + 1, CBS_len(&cbs) - 1)) {
213	0	CBS_skip(&cbs, 1);
214	0	}
215	0	} else {
216		// Remove the leading zero byte, if any.
217	0	if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0x00) {
218	0	CBS_skip(&cbs, 1);
219	0	}
220	0	}
221
222	0	if (!ASN1_STRING_set(ret, CBS_data(&cbs), CBS_len(&cbs))) {
223	0	goto err;
224	0	}
225
226	0	if (is_negative) {
227	0	ret->type = V_ASN1_NEG_INTEGER;
228	0	negate_twos_complement(ret->data, ret->length);
229	0	} else {
230	0	ret->type = V_ASN1_INTEGER;
231	0	}
232
233		// The value should be minimally-encoded.
234	0	assert(ret->length == 0 \|\| ret->data[0] != 0);
235		// Zero is not negative.
236	0	assert(!is_negative \|\| ret->length > 0);
237
238	0	*inp += len;
239	0	if (out != NULL) {
240	0	*out = ret;
241	0	}
242	0	return ret;
243
244	0	err:
245	0	if (ret != NULL && (out == NULL \|\| *out != ret)) {
246	0	ASN1_INTEGER_free(ret);
247	0	}
248	0	return NULL;
249	0	}
250
251	0	int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t v) {
252	0	if (v >= 0) {
253	0	return ASN1_INTEGER_set_uint64(a, (uint64_t)v);
254	0	}
255
256	0	if (!ASN1_INTEGER_set_uint64(a, 0 - (uint64_t)v)) {
257	0	return 0;
258	0	}
259
260	0	a->type = V_ASN1_NEG_INTEGER;
261	0	return 1;
262	0	}
263
264	0	int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t v) {
265	0	if (v >= 0) {
266	0	return ASN1_ENUMERATED_set_uint64(a, (uint64_t)v);
267	0	}
268
269	0	if (!ASN1_ENUMERATED_set_uint64(a, 0 - (uint64_t)v)) {
270	0	return 0;
271	0	}
272
273	0	a->type = V_ASN1_NEG_ENUMERATED;
274	0	return 1;
275	0	}
276
277	0	int ASN1_INTEGER_set(ASN1_INTEGER *a, long v) {
278	0	static_assert(sizeof(long) <= sizeof(int64_t), "long fits in int64_t");
279	0	return ASN1_INTEGER_set_int64(a, v);
280	0	}
281
282	0	int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) {
283	0	static_assert(sizeof(long) <= sizeof(int64_t), "long fits in int64_t");
284	0	return ASN1_ENUMERATED_set_int64(a, v);
285	0	}
286
287	0	static int asn1_string_set_uint64(ASN1_STRING *out, uint64_t v, int type) {
288	0	uint8_t buf[sizeof(uint64_t)];
289	0	CRYPTO_store_u64_be(buf, v);
290	0	size_t leading_zeros;
291	0	for (leading_zeros = 0; leading_zeros < sizeof(buf); leading_zeros++) {
292	0	if (buf[leading_zeros] != 0) {
293	0	break;
294	0	}
295	0	}
296
297	0	if (!ASN1_STRING_set(out, buf + leading_zeros, sizeof(buf) - leading_zeros)) {
298	0	return 0;
299	0	}
300	0	out->type = type;
301	0	return 1;
302	0	}
303
304	0	int ASN1_INTEGER_set_uint64(ASN1_INTEGER *out, uint64_t v) {
305	0	return asn1_string_set_uint64(out, v, V_ASN1_INTEGER);
306	0	}
307
308	0	int ASN1_ENUMERATED_set_uint64(ASN1_ENUMERATED *out, uint64_t v) {
309	0	return asn1_string_set_uint64(out, v, V_ASN1_ENUMERATED);
310	0	}
311
312		static int asn1_string_get_abs_uint64(uint64_t out, const ASN1_STRING a,
313	0	int type) {
314	0	if ((a->type & ~V_ASN1_NEG) != type) {
315	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
316	0	return 0;
317	0	}
318	0	uint8_t buf[sizeof(uint64_t)] = {0};
319	0	if (a->length > (int)sizeof(buf)) {
320	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
321	0	return 0;
322	0	}
323	0	OPENSSL_memcpy(buf + sizeof(buf) - a->length, a->data, a->length);
324	0	*out = CRYPTO_load_u64_be(buf);
325	0	return 1;
326	0	}
327
328		static int asn1_string_get_uint64(uint64_t out, const ASN1_STRING a,
329		int type) {
330		if (!asn1_string_get_abs_uint64(out, a, type)) {
331		return 0;
332		}
333		if (a->type & V_ASN1_NEG) {
334		OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
335		return 0;
336		}
337		return 1;
338		}
339
340	1	int ASN1_INTEGER_get_uint64(uint64_t out, const ASN1_INTEGER a) {
341	1	return asn1_string_get_uint64(out, a, V_ASN1_INTEGER);
342	1	}
343
344	0	int ASN1_ENUMERATED_get_uint64(uint64_t out, const ASN1_ENUMERATED a) {
345	0	return asn1_string_get_uint64(out, a, V_ASN1_ENUMERATED);
346	0	}
347
348	0	static int asn1_string_get_int64(int64_t out, const ASN1_STRING a, int type) {
349	0	uint64_t v;
350	0	if (!asn1_string_get_abs_uint64(&v, a, type)) {
351	0	return 0;
352	0	}
353	0	int64_t i64;
354	0	int fits_in_i64;
355		// Check \|v != 0\| to handle manually-constructed negative zeros.
356	0	if ((a->type & V_ASN1_NEG) && v != 0) {
357	0	i64 = (int64_t)(0u - v);
358	0	fits_in_i64 = i64 < 0;
359	0	} else {
360	0	i64 = (int64_t)v;
361	0	fits_in_i64 = i64 >= 0;
362	0	}
363	0	if (!fits_in_i64) {
364	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
365	0	return 0;
366	0	}
367	0	*out = i64;
368	0	return 1;
369	0	}
370
371	0	int ASN1_INTEGER_get_int64(int64_t out, const ASN1_INTEGER a) {
372	0	return asn1_string_get_int64(out, a, V_ASN1_INTEGER);
373	0	}
374
375	0	int ASN1_ENUMERATED_get_int64(int64_t out, const ASN1_ENUMERATED a) {
376	0	return asn1_string_get_int64(out, a, V_ASN1_ENUMERATED);
377	0	}
378
379	0	static long asn1_string_get_long(const ASN1_STRING *a, int type) {
380	0	if (a == NULL) {
381	0	return 0;
382	0	}
383
384	0	int64_t v;
385	0	if (!asn1_string_get_int64(&v, a, type) \|\| //
386	0	v < LONG_MIN \|\| v > LONG_MAX) {
387		// This function's return value does not distinguish overflow from -1.
388	0	ERR_clear_error();
389	0	return -1;
390	0	}
391
392	0	return (long)v;
393	0	}
394
395	0	long ASN1_INTEGER_get(const ASN1_INTEGER *a) {
396	0	return asn1_string_get_long(a, V_ASN1_INTEGER);
397	0	}
398
399	0	long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a) {
400	0	return asn1_string_get_long(a, V_ASN1_ENUMERATED);
401	0	}
402
403		static ASN1_STRING bn_to_asn1_string(const BIGNUM bn, ASN1_STRING *ai,
404	5.49k	int type) {
405	5.49k	ASN1_INTEGER *ret;
406	5.49k	if (ai == NULL) {
407	5.49k	ret = ASN1_STRING_type_new(type);
408	5.49k	} else {
409	0	ret = ai;
410	0	}
411	5.49k	if (ret == NULL) {
412	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
413	0	goto err;
414	0	}
415
416	5.49k	if (BN_is_negative(bn) && !BN_is_zero(bn)) {
417	23	ret->type = type \| V_ASN1_NEG;
418	5.47k	} else {
419	5.47k	ret->type = type;
420	5.47k	}
421
422	5.49k	int len = BN_num_bytes(bn);
423	5.49k	if (!ASN1_STRING_set(ret, NULL, len) \|\|
424	5.49k	!BN_bn2bin_padded(ret->data, len, bn)) {
425	0	goto err;
426	0	}
427	5.49k	return ret;
428
429	0	err:
430	0	if (ret != ai) {
431	0	ASN1_STRING_free(ret);
432	0	}
433	0	return NULL;
434	5.49k	}
435
436	7.65k	ASN1_INTEGER BN_to_ASN1_INTEGER(const BIGNUM bn, ASN1_INTEGER *ai) {
437	7.65k	return bn_to_asn1_string(bn, ai, V_ASN1_INTEGER);
438	7.65k	}
439
440	7.18k	ASN1_ENUMERATED BN_to_ASN1_ENUMERATED(const BIGNUM bn, ASN1_ENUMERATED *ai) {
441	7.18k	return bn_to_asn1_string(bn, ai, V_ASN1_ENUMERATED);
442	7.18k	}
443
444	5.49k	static BIGNUM asn1_string_to_bn(const ASN1_STRING ai, BIGNUM *bn, int type) {
445	5.49k	if ((ai->type & ~V_ASN1_NEG) != type) {
446	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
447	0	return NULL;
448	0	}
449
450	5.49k	BIGNUM *ret;
451	5.49k	if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) {
452	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
453	5.49k	} else if (ai->type & V_ASN1_NEG) {
454	23	BN_set_negative(ret, 1);
455	23	}
456	5.49k	return ret;
457	5.49k	}
458
459	7.65k	BIGNUM ASN1_INTEGER_to_BN(const ASN1_INTEGER ai, BIGNUM *bn) {
460	7.65k	return asn1_string_to_bn(ai, bn, V_ASN1_INTEGER);
461	7.65k	}
462
463	7.18k	BIGNUM ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED ai, BIGNUM *bn) {
464	7.18k	return asn1_string_to_bn(ai, bn, V_ASN1_ENUMERATED);
465	7.18k	}