1 /*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/objects.h>
13 #include <openssl/buffer.h>
14 #include "crypto/bn.h"
15
16 /* Number of octets per line */
17 #define ASN1_BUF_PRINT_WIDTH 15
18 /* Maximum indent */
19 #define ASN1_PRINT_MAX_INDENT 128
20
ASN1_buf_print(BIO * bp,const unsigned char * buf,size_t buflen,int indent)21 int ASN1_buf_print(BIO *bp, const unsigned char *buf, size_t buflen, int indent)
22 {
23 size_t i;
24
25 for (i = 0; i < buflen; i++) {
26 if ((i % ASN1_BUF_PRINT_WIDTH) == 0) {
27 if (i > 0 && BIO_puts(bp, "\n") <= 0)
28 return 0;
29 if (!BIO_indent(bp, indent, ASN1_PRINT_MAX_INDENT))
30 return 0;
31 }
32 /*
33 * Use colon separators for each octet for compatibility as
34 * this function is used to print out key components.
35 */
36 if (BIO_printf(bp, "%02x%s", buf[i],
37 (i == buflen - 1) ? "" : ":") <= 0)
38 return 0;
39 }
40 if (BIO_write(bp, "\n", 1) <= 0)
41 return 0;
42 return 1;
43 }
44
ASN1_bn_print(BIO * bp,const char * number,const BIGNUM * num,unsigned char * ign,int indent)45 int ASN1_bn_print(BIO *bp, const char *number, const BIGNUM *num,
46 unsigned char *ign, int indent)
47 {
48 int n, rv = 0;
49 const char *neg;
50 unsigned char *buf = NULL, *tmp = NULL;
51 int buflen;
52
53 if (num == NULL)
54 return 1;
55 neg = BN_is_negative(num) ? "-" : "";
56 if (!BIO_indent(bp, indent, ASN1_PRINT_MAX_INDENT))
57 return 0;
58 if (BN_is_zero(num)) {
59 if (BIO_printf(bp, "%s 0\n", number) <= 0)
60 return 0;
61 return 1;
62 }
63
64 if (BN_num_bytes(num) <= BN_BYTES) {
65 if (BIO_printf(bp, "%s %s%lu (%s0x%lx)\n", number, neg,
66 (unsigned long)bn_get_words(num)[0], neg,
67 (unsigned long)bn_get_words(num)[0]) <= 0)
68 return 0;
69 return 1;
70 }
71
72 buflen = BN_num_bytes(num) + 1;
73 buf = tmp = OPENSSL_malloc(buflen);
74 if (buf == NULL)
75 goto err;
76 buf[0] = 0;
77 if (BIO_printf(bp, "%s%s\n", number,
78 (neg[0] == '-') ? " (Negative)" : "") <= 0)
79 goto err;
80 n = BN_bn2bin(num, buf + 1);
81
82 if (buf[1] & 0x80)
83 n++;
84 else
85 tmp++;
86
87 if (ASN1_buf_print(bp, tmp, n, indent + 4) == 0)
88 goto err;
89 rv = 1;
90 err:
91 OPENSSL_clear_free(buf, buflen);
92 return rv;
93 }
94