1 /*
2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (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