/src/boringssl/crypto/asn1/a_int.cc

Source
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#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 <openssl/span.h>

#include "../internal.h"
#include "internal.h"


using namespace bssl;

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 bssl::asn1_marshal_integer(CBB *out, const ASN1_INTEGER *in,
                               CBS_ASN1_TAG tag) {
  int len = i2c_ASN1_INTEGER(in, nullptr);
  if (len <= 0) {
    return 0;
  }
  tag = tag == 0 ? CBS_ASN1_INTEGER : tag;
  CBB child;
  uint8_t *ptr;
  return CBB_add_asn1(out, &child, tag) &&     //
         CBB_add_space(&child, &ptr, static_cast<size_t>(len)) &&   //
         i2c_ASN1_INTEGER(in, &ptr) == len &&  //
         CBB_flush(out);
}

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

static int asn1_parse_integer_contents(Span<const uint8_t> in,
                                       ASN1_INTEGER *out) {
  CBS cbs = in;
  int is_negative;
  if (!CBS_is_valid_asn1_integer(&cbs, &is_negative)) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
    return 0;
  }

  // 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(out, CBS_data(&cbs), CBS_len(&cbs))) {
    return 0;
  }

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

  // The value should be minimally-encoded.
  assert(out->length == 0 || out->data[0] != 0);
  // Zero is not negative.
  assert(!is_negative || out->length > 0);
  return 1;
}

int bssl::asn1_parse_integer(CBS *cbs, ASN1_INTEGER *out, CBS_ASN1_TAG tag) {
  tag = tag == 0 ? CBS_ASN1_INTEGER : tag;
  CBS child;
  if (!CBS_get_asn1(cbs, &child, tag)) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
    return 0;
  }
  return asn1_parse_integer_contents(child, out);
}

int bssl::asn1_parse_enumerated(CBS *cbs, ASN1_ENUMERATED *out,
                                CBS_ASN1_TAG tag) {
  tag = tag == 0 ? CBS_ASN1_ENUMERATED : tag;
  if (!asn1_parse_integer(cbs, out, tag)) {
    return 0;
  }
  // Fix the type value.
  out->type =
      (out->type & V_ASN1_NEG) ? V_ASN1_NEG_ENUMERATED : V_ASN1_ENUMERATED;
  return 1;
}

ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **out, const unsigned char **inp,
                               long len) {
  if (len < 0) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT);
    return nullptr;
  }

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

  if (!asn1_parse_integer_contents(Span(*inp, len), ret)) {
    if (ret != nullptr && (out == nullptr || *out != ret)) {
      ASN1_INTEGER_free(ret);
    }
    return nullptr;
  }

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

}

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 == nullptr) {
    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 == nullptr) {
    ret = ASN1_STRING_type_new(type);
  } else {
    ret = ai;
  }
  int len;
  if (ret == nullptr) {
    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;
  }

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

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

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 nullptr;
  }

  BIGNUM *ret;
  if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == nullptr) {
    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: 2026-02-16 07:12

Line	Count	Source
1		// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
2		//
3		// Licensed under the Apache License, Version 2.0 (the "License");
4		// you may not use this file except in compliance with the License.
5		// You may obtain a copy of the License at
6		//
7		// https://www.apache.org/licenses/LICENSE-2.0
8		//
9		// Unless required by applicable law or agreed to in writing, software
10		// distributed under the License is distributed on an "AS IS" BASIS,
11		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12		// See the License for the specific language governing permissions and
13		// limitations under the License.
14
15		#include <openssl/asn1.h>
16
17		#include <assert.h>
18		#include <limits.h>
19		#include <string.h>
20
21		#include <openssl/bytestring.h>
22		#include <openssl/err.h>
23		#include <openssl/mem.h>
24		#include <openssl/span.h>
25
26		#include "../internal.h"
27		#include "internal.h"
28
29
30		using namespace bssl;
31
32	48	ASN1_INTEGER ASN1_INTEGER_dup(const ASN1_INTEGER x) {
33	48	return ASN1_STRING_dup(x);
34	48	}
35
36	35	int ASN1_INTEGER_cmp(const ASN1_INTEGER x, const ASN1_INTEGER y) {
37		// Compare signs.
38	35	int neg = x->type & V_ASN1_NEG;
39	35	if (neg != (y->type & V_ASN1_NEG)) {
40	1	return neg ? -1 : 1;
41	1	}
42
43	34	int ret = ASN1_STRING_cmp(x, y);
44	34	if (neg) {
45		// This could be \|-ret\|, but \|ASN1_STRING_cmp\| is not forbidden from
46		// returning \|INT_MIN\|.
47	19	if (ret < 0) {
48	10	return 1;
49	10	} else if (ret > 0) {
50	8	return -1;
51	8	} else {
52	1	return 0;
53	1	}
54	19	}
55
56	15	return ret;
57	34	}
58
59		// negate_twos_complement negates \|len\| bytes from \|buf\| in-place, interpreted
60		// as a signed, big-endian two's complement value.
61	133k	static void negate_twos_complement(uint8_t *buf, size_t len) {
62	133k	uint8_t borrow = 0;
63	9.02M	for (size_t i = len - 1; i < len; i--) {
64	8.89M	uint8_t t = buf[i];
65	8.89M	buf[i] = 0u - borrow - t;
66	8.89M	borrow \|= t != 0;
67	8.89M	}
68	133k	}
69
70	31.5k	static int is_all_zeros(const uint8_t *in, size_t len) {
71	69.7k	for (size_t i = 0; i < len; i++) {
72	64.4k	if (in[i] != 0) {
73	26.2k	return 0;
74	26.2k	}
75	64.4k	}
76	5.29k	return 1;
77	31.5k	}
78
79		int bssl::asn1_marshal_integer(CBB out, const ASN1_INTEGER in,
80	127k	CBS_ASN1_TAG tag) {
81	127k	int len = i2c_ASN1_INTEGER(in, nullptr);
82	127k	if (len <= 0) {
83	0	return 0;
84	0	}
85	127k	tag = tag == 0 ? CBS_ASN1_INTEGER : tag;
86	127k	CBB child;
87	127k	uint8_t *ptr;
88	127k	return CBB_add_asn1(out, &child, tag) && //
89	127k	CBB_add_space(&child, &ptr, static_cast<size_t>(len)) && //
90	127k	i2c_ASN1_INTEGER(in, &ptr) == len && //
91	127k	CBB_flush(out);
92	127k	}
93
94	300k	int i2c_ASN1_INTEGER(const ASN1_INTEGER in, unsigned char *outp) {
95	300k	if (in == nullptr) {
96	0	return 0;
97	0	}
98
99		// \|ASN1_INTEGER\|s should be represented minimally, but it is possible to
100		// construct invalid ones. Skip leading zeros so this does not produce an
101		// invalid encoding or break invariants.
102	300k	CBS cbs;
103	300k	CBS_init(&cbs, in->data, in->length);
104	300k	while (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0) {
105	0	CBS_skip(&cbs, 1);
106	0	}
107
108	300k	int is_negative = (in->type & V_ASN1_NEG) != 0;
109	300k	size_t pad;
110	300k	CBS copy = cbs;
111	300k	uint8_t msb;
112	300k	if (!CBS_get_u8(&copy, &msb)) {
113		// Zero is represented as a single byte.
114	15.9k	is_negative = 0;
115	15.9k	pad = 1;
116	284k	} else if (is_negative) {
117		// 0x80...01 through 0xff...ff have a two's complement of 0x7f...ff
118		// through 0x00...01 and need an extra byte to be negative.
119		// 0x01...00 through 0x80...00 have a two's complement of 0xfe...ff
120		// through 0x80...00 and can be negated as-is.
121	168k	pad = msb > 0x80 \|\|
122	92.6k	(msb == 0x80 && !is_all_zeros(CBS_data(&copy), CBS_len(&copy)));
123	168k	} else {
124		// If the high bit is set, the signed representation needs an extra
125		// byte to be positive.
126	115k	pad = (msb & 0x80) != 0;
127	115k	}
128
129	300k	if (CBS_len(&cbs) > INT_MAX - pad) {
130	0	OPENSSL_PUT_ERROR(ASN1, ERR_R_OVERFLOW);
131	0	return 0;
132	0	}
133	300k	int len = (int)(pad + CBS_len(&cbs));
134	300k	assert(len > 0);
135	300k	if (outp == nullptr) {
136	158k	return len;
137	158k	}
138
139	141k	if (pad) {
140	48.6k	(*outp)[0] = 0;
141	48.6k	}
142	141k	OPENSSL_memcpy(*outp + pad, CBS_data(&cbs), CBS_len(&cbs));
143	141k	if (is_negative) {
144	79.8k	negate_twos_complement(*outp, len);
145	79.8k	assert((*outp)[0] >= 0x80);
146	79.8k	} else {
147	61.8k	assert((*outp)[0] < 0x80);
148	61.8k	}
149	141k	*outp += len;
150	141k	return len;
151	141k	}
152
153		static int asn1_parse_integer_contents(Span<const uint8_t> in,
154	237k	ASN1_INTEGER *out) {
155	237k	CBS cbs = in;
156	237k	int is_negative;
157	237k	if (!CBS_is_valid_asn1_integer(&cbs, &is_negative)) {
158	280	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
159	280	return 0;
160	280	}
161
162		// Convert to \|ASN1_INTEGER\|'s sign-and-magnitude representation. First,
163		// determine the size needed for a minimal result.
164	236k	if (is_negative) {
165		// 0xff00...01 through 0xff7f..ff have a two's complement of 0x00ff...ff
166		// through 0x000100...001 and need one leading zero removed. 0x8000...00
167		// through 0xff00...00 have a two's complement of 0x8000...00 through
168		// 0x0100...00 and will be minimally-encoded as-is.
169	54.0k	if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0xff &&
170	25.1k	!is_all_zeros(CBS_data(&cbs) + 1, CBS_len(&cbs) - 1)) {
171	23.3k	CBS_skip(&cbs, 1);
172	23.3k	}
173	182k	} else {
174		// Remove the leading zero byte, if any.
175	182k	if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0x00) {
176	102k	CBS_skip(&cbs, 1);
177	102k	}
178	182k	}
179
180	236k	if (!ASN1_STRING_set(out, CBS_data(&cbs), CBS_len(&cbs))) {
181	0	return 0;
182	0	}
183
184	236k	if (is_negative) {
185	54.0k	out->type = V_ASN1_NEG_INTEGER;
186	54.0k	negate_twos_complement(out->data, out->length);
187	182k	} else {
188	182k	out->type = V_ASN1_INTEGER;
189	182k	}
190
191		// The value should be minimally-encoded.
192	236k	assert(out->length == 0 \|\| out->data[0] != 0);
193		// Zero is not negative.
194	236k	assert(!is_negative \|\| out->length > 0);
195	236k	return 1;
196	236k	}
197
198	239k	int bssl::asn1_parse_integer(CBS cbs, ASN1_INTEGER out, CBS_ASN1_TAG tag) {
199	239k	tag = tag == 0 ? CBS_ASN1_INTEGER : tag;
200	239k	CBS child;
201	239k	if (!CBS_get_asn1(cbs, &child, tag)) {
202	2.08k	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
203	2.08k	return 0;
204	2.08k	}
205	237k	return asn1_parse_integer_contents(child, out);
206	239k	}
207
208		int bssl::asn1_parse_enumerated(CBS cbs, ASN1_ENUMERATED out,
209	64.6k	CBS_ASN1_TAG tag) {
210	64.6k	tag = tag == 0 ? CBS_ASN1_ENUMERATED : tag;
211	64.6k	if (!asn1_parse_integer(cbs, out, tag)) {
212	818	return 0;
213	818	}
214		// Fix the type value.
215	63.7k	out->type =
216	63.7k	(out->type & V_ASN1_NEG) ? V_ASN1_NEG_ENUMERATED : V_ASN1_ENUMERATED;
217	63.7k	return 1;
218	64.6k	}
219
220		ASN1_INTEGER c2i_ASN1_INTEGER(ASN1_INTEGER out, const unsigned char *inp,
221	0	long len) {
222	0	if (len < 0) {
223	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT);
224	0	return nullptr;
225	0	}
226
227	0	ASN1_INTEGER *ret = nullptr;
228	0	if (out == nullptr \|\| *out == nullptr) {
229	0	ret = ASN1_INTEGER_new();
230	0	if (ret == nullptr) {
231	0	return nullptr;
232	0	}
233	0	} else {
234	0	ret = *out;
235	0	}
236
237	0	if (!asn1_parse_integer_contents(Span(*inp, len), ret)) {
238	0	if (ret != nullptr && (out == nullptr \|\| *out != ret)) {
239	0	ASN1_INTEGER_free(ret);
240	0	}
241	0	return nullptr;
242	0	}
243
244	0	*inp += len;
245	0	if (out != nullptr) {
246	0	*out = ret;
247	0	}
248	0	return ret;
249
250	0	}
251
252	0	int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t v) {
253	0	if (v >= 0) {
254	0	return ASN1_INTEGER_set_uint64(a, (uint64_t)v);
255	0	}
256
257	0	if (!ASN1_INTEGER_set_uint64(a, 0 - (uint64_t)v)) {
258	0	return 0;
259	0	}
260
261	0	a->type = V_ASN1_NEG_INTEGER;
262	0	return 1;
263	0	}
264
265	0	int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t v) {
266	0	if (v >= 0) {
267	0	return ASN1_ENUMERATED_set_uint64(a, (uint64_t)v);
268	0	}
269
270	0	if (!ASN1_ENUMERATED_set_uint64(a, 0 - (uint64_t)v)) {
271	0	return 0;
272	0	}
273
274	0	a->type = V_ASN1_NEG_ENUMERATED;
275	0	return 1;
276	0	}
277
278	0	int ASN1_INTEGER_set(ASN1_INTEGER *a, long v) {
279	0	static_assert(sizeof(long) <= sizeof(int64_t), "long fits in int64_t");
280	0	return ASN1_INTEGER_set_int64(a, v);
281	0	}
282
283	0	int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) {
284	0	static_assert(sizeof(long) <= sizeof(int64_t), "long fits in int64_t");
285	0	return ASN1_ENUMERATED_set_int64(a, v);
286	0	}
287
288	0	static int asn1_string_set_uint64(ASN1_STRING *out, uint64_t v, int type) {
289	0	uint8_t buf[sizeof(uint64_t)];
290	0	CRYPTO_store_u64_be(buf, v);
291	0	size_t leading_zeros;
292	0	for (leading_zeros = 0; leading_zeros < sizeof(buf); leading_zeros++) {
293	0	if (buf[leading_zeros] != 0) {
294	0	break;
295	0	}
296	0	}
297
298	0	if (!ASN1_STRING_set(out, buf + leading_zeros, sizeof(buf) - leading_zeros)) {
299	0	return 0;
300	0	}
301	0	out->type = type;
302	0	return 1;
303	0	}
304
305	0	int ASN1_INTEGER_set_uint64(ASN1_INTEGER *out, uint64_t v) {
306	0	return asn1_string_set_uint64(out, v, V_ASN1_INTEGER);
307	0	}
308
309	0	int ASN1_ENUMERATED_set_uint64(ASN1_ENUMERATED *out, uint64_t v) {
310	0	return asn1_string_set_uint64(out, v, V_ASN1_ENUMERATED);
311	0	}
312
313		static int asn1_string_get_abs_uint64(uint64_t out, const ASN1_STRING a,
314	3.90k	int type) {
315	3.90k	if ((a->type & ~V_ASN1_NEG) != type) {
316	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
317	0	return 0;
318	0	}
319	3.90k	uint8_t buf[sizeof(uint64_t)] = {0};
320	3.90k	if (a->length > (int)sizeof(buf)) {
321	1.98k	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
322	1.98k	return 0;
323	1.98k	}
324	1.92k	OPENSSL_memcpy(buf + sizeof(buf) - a->length, a->data, a->length);
325	1.92k	*out = CRYPTO_load_u64_be(buf);
326	1.92k	return 1;
327	3.90k	}
328
329		static int asn1_string_get_uint64(uint64_t out, const ASN1_STRING a,
330	2.88k	int type) {
331	2.88k	if (!asn1_string_get_abs_uint64(out, a, type)) {
332	1.68k	return 0;
333	1.68k	}
334	1.19k	if (a->type & V_ASN1_NEG) {
335	371	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
336	371	return 0;
337	371	}
338	828	return 1;
339	1.19k	}
340
341	2.88k	int ASN1_INTEGER_get_uint64(uint64_t out, const ASN1_INTEGER a) {
342	2.88k	return asn1_string_get_uint64(out, a, V_ASN1_INTEGER);
343	2.88k	}
344
345	0	int ASN1_ENUMERATED_get_uint64(uint64_t out, const ASN1_ENUMERATED a) {
346	0	return asn1_string_get_uint64(out, a, V_ASN1_ENUMERATED);
347	0	}
348
349	1.02k	static int asn1_string_get_int64(int64_t out, const ASN1_STRING a, int type) {
350	1.02k	uint64_t v;
351	1.02k	if (!asn1_string_get_abs_uint64(&v, a, type)) {
352	301	return 0;
353	301	}
354	721	int64_t i64;
355	721	int fits_in_i64;
356		// Check \|v != 0\| to handle manually-constructed negative zeros.
357	721	if ((a->type & V_ASN1_NEG) && v != 0) {
358	382	i64 = (int64_t)(0u - v);
359	382	fits_in_i64 = i64 < 0;
360	382	} else {
361	339	i64 = (int64_t)v;
362	339	fits_in_i64 = i64 >= 0;
363	339	}
364	721	if (!fits_in_i64) {
365	175	OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
366	175	return 0;
367	175	}
368	546	*out = i64;
369	546	return 1;
370	721	}
371
372	0	int ASN1_INTEGER_get_int64(int64_t out, const ASN1_INTEGER a) {
373	0	return asn1_string_get_int64(out, a, V_ASN1_INTEGER);
374	0	}
375
376	0	int ASN1_ENUMERATED_get_int64(int64_t out, const ASN1_ENUMERATED a) {
377	0	return asn1_string_get_int64(out, a, V_ASN1_ENUMERATED);
378	0	}
379
380	1.02k	static long asn1_string_get_long(const ASN1_STRING *a, int type) {
381	1.02k	if (a == nullptr) {
382	0	return 0;
383	0	}
384
385	1.02k	int64_t v;
386	1.02k	if (!asn1_string_get_int64(&v, a, type) \|\| //
387	546	v < LONG_MIN \|\| v > LONG_MAX) {
388		// This function's return value does not distinguish overflow from -1.
389	476	ERR_clear_error();
390	476	return -1;
391	476	}
392
393	546	return (long)v;
394	1.02k	}
395
396	14	long ASN1_INTEGER_get(const ASN1_INTEGER *a) {
397	14	return asn1_string_get_long(a, V_ASN1_INTEGER);
398	14	}
399
400	1.00k	long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a) {
401	1.00k	return asn1_string_get_long(a, V_ASN1_ENUMERATED);
402	1.00k	}
403
404		static ASN1_STRING bn_to_asn1_string(const BIGNUM bn, ASN1_STRING *ai,
405	11.8k	int type) {
406	11.8k	ASN1_INTEGER *ret;
407	11.8k	if (ai == nullptr) {
408	11.8k	ret = ASN1_STRING_type_new(type);
409	11.8k	} else {
410	0	ret = ai;
411	0	}
412	11.8k	int len;
413	11.8k	if (ret == nullptr) {
414	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
415	0	goto err;
416	0	}
417
418	11.8k	if (BN_is_negative(bn) && !BN_is_zero(bn)) {
419	390	ret->type = type \| V_ASN1_NEG;
420	11.4k	} else {
421	11.4k	ret->type = type;
422	11.4k	}
423
424	11.8k	len = BN_num_bytes(bn);
425	11.8k	if (!ASN1_STRING_set(ret, nullptr, len) \|\|
426	11.8k	!BN_bn2bin_padded(ret->data, len, bn)) {
427	0	goto err;
428	0	}
429	11.8k	return ret;
430
431	0	err:
432	0	if (ret != ai) {
433	0	ASN1_STRING_free(ret);
434	0	}
435	0	return nullptr;
436	11.8k	}
437
438	11.8k	ASN1_INTEGER BN_to_ASN1_INTEGER(const BIGNUM bn, ASN1_INTEGER *ai) {
439	11.8k	return bn_to_asn1_string(bn, ai, V_ASN1_INTEGER);
440	11.8k	}
441
442	0	ASN1_ENUMERATED BN_to_ASN1_ENUMERATED(const BIGNUM bn, ASN1_ENUMERATED *ai) {
443	0	return bn_to_asn1_string(bn, ai, V_ASN1_ENUMERATED);
444	0	}
445
446	1.69k	static BIGNUM asn1_string_to_bn(const ASN1_STRING ai, BIGNUM *bn, int type) {
447	1.69k	if ((ai->type & ~V_ASN1_NEG) != type) {
448	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
449	0	return nullptr;
450	0	}
451
452	1.69k	BIGNUM *ret;
453	1.69k	if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == nullptr) {
454	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
455	1.69k	} else if (ai->type & V_ASN1_NEG) {
456	933	BN_set_negative(ret, 1);
457	933	}
458	1.69k	return ret;
459	1.69k	}
460
461	746	BIGNUM ASN1_INTEGER_to_BN(const ASN1_INTEGER ai, BIGNUM *bn) {
462	746	return asn1_string_to_bn(ai, bn, V_ASN1_INTEGER);
463	746	}
464
465	950	BIGNUM ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED ai, BIGNUM *bn) {
466	950	return asn1_string_to_bn(ai, bn, V_ASN1_ENUMERATED);
467	950	}