[331] | 1 | /*
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| 2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #ifdef OPENSSL_NO_CT
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| 11 | # error "CT is disabled"
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| 12 | #endif
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| 13 |
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| 14 | #include <limits.h>
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| 15 | #include <string.h>
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| 16 |
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| 17 | #include <openssl/asn1.h>
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| 18 | #include <openssl/buffer.h>
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| 19 | #include <openssl/ct.h>
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| 20 | #include <openssl/err.h>
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| 21 |
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| 22 | #include "ct_locl.h"
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| 23 |
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| 24 | int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len)
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| 25 | {
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| 26 | size_t siglen;
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| 27 | size_t len_remaining = len;
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| 28 | const unsigned char *p;
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| 29 |
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| 30 | if (sct->version != SCT_VERSION_V1) {
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| 31 | CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_UNSUPPORTED_VERSION);
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| 32 | return -1;
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| 33 | }
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| 34 | /*
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| 35 | * digitally-signed struct header: (1 byte) Hash algorithm (1 byte)
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| 36 | * Signature algorithm (2 bytes + ?) Signature
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| 37 | *
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| 38 | * This explicitly rejects empty signatures: they're invalid for
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| 39 | * all supported algorithms.
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| 40 | */
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| 41 | if (len <= 4) {
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| 42 | CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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| 43 | return -1;
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| 44 | }
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| 45 |
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| 46 | p = *in;
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| 47 | /* Get hash and signature algorithm */
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| 48 | sct->hash_alg = *p++;
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| 49 | sct->sig_alg = *p++;
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| 50 | if (SCT_get_signature_nid(sct) == NID_undef) {
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| 51 | CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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| 52 | return -1;
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| 53 | }
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| 54 | /* Retrieve signature and check it is consistent with the buffer length */
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| 55 | n2s(p, siglen);
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| 56 | len_remaining -= (p - *in);
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| 57 | if (siglen > len_remaining) {
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| 58 | CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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| 59 | return -1;
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| 60 | }
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| 61 |
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| 62 | if (SCT_set1_signature(sct, p, siglen) != 1)
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| 63 | return -1;
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| 64 | len_remaining -= siglen;
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| 65 | *in = p + siglen;
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| 66 |
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| 67 | return len - len_remaining;
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| 68 | }
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| 69 |
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| 70 | SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len)
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| 71 | {
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| 72 | SCT *sct = NULL;
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| 73 | const unsigned char *p;
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| 74 |
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| 75 | if (len == 0 || len > MAX_SCT_SIZE) {
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| 76 | CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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| 77 | goto err;
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| 78 | }
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| 79 |
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| 80 | if ((sct = SCT_new()) == NULL)
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| 81 | goto err;
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| 82 |
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| 83 | p = *in;
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| 84 |
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| 85 | sct->version = *p;
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| 86 | if (sct->version == SCT_VERSION_V1) {
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| 87 | int sig_len;
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| 88 | size_t len2;
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| 89 | /*-
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| 90 | * Fixed-length header:
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| 91 | * struct {
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| 92 | * Version sct_version; (1 byte)
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| 93 | * log_id id; (32 bytes)
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| 94 | * uint64 timestamp; (8 bytes)
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| 95 | * CtExtensions extensions; (2 bytes + ?)
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| 96 | * }
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| 97 | */
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| 98 | if (len < 43) {
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| 99 | CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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| 100 | goto err;
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| 101 | }
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| 102 | len -= 43;
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| 103 | p++;
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| 104 | sct->log_id = BUF_memdup(p, CT_V1_HASHLEN);
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| 105 | if (sct->log_id == NULL)
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| 106 | goto err;
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| 107 | sct->log_id_len = CT_V1_HASHLEN;
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| 108 | p += CT_V1_HASHLEN;
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| 109 |
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| 110 | n2l8(p, sct->timestamp);
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| 111 |
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| 112 | n2s(p, len2);
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| 113 | if (len < len2) {
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| 114 | CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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| 115 | goto err;
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| 116 | }
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| 117 | if (len2 > 0) {
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| 118 | sct->ext = BUF_memdup(p, len2);
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| 119 | if (sct->ext == NULL)
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| 120 | goto err;
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| 121 | }
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| 122 | sct->ext_len = len2;
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| 123 | p += len2;
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| 124 | len -= len2;
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| 125 |
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| 126 | sig_len = o2i_SCT_signature(sct, &p, len);
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| 127 | if (sig_len <= 0) {
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| 128 | CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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| 129 | goto err;
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| 130 | }
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| 131 | len -= sig_len;
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| 132 | *in = p + len;
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| 133 | } else {
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| 134 | /* If not V1 just cache encoding */
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| 135 | sct->sct = BUF_memdup(p, len);
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| 136 | if (sct->sct == NULL)
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| 137 | goto err;
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| 138 | sct->sct_len = len;
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| 139 | *in = p + len;
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| 140 | }
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| 141 |
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| 142 | if (psct != NULL) {
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| 143 | SCT_free(*psct);
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| 144 | *psct = sct;
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| 145 | }
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| 146 |
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| 147 | return sct;
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| 148 | err:
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| 149 | SCT_free(sct);
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| 150 | return NULL;
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| 151 | }
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| 152 |
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| 153 | int i2o_SCT_signature(const SCT *sct, unsigned char **out)
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| 154 | {
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| 155 | size_t len;
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| 156 | unsigned char *p = NULL, *pstart = NULL;
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| 157 |
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| 158 | if (!SCT_signature_is_complete(sct)) {
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| 159 | CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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| 160 | goto err;
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| 161 | }
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| 162 |
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| 163 | if (sct->version != SCT_VERSION_V1) {
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| 164 | CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_UNSUPPORTED_VERSION);
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| 165 | goto err;
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| 166 | }
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| 167 |
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| 168 | /*
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| 169 | * (1 byte) Hash algorithm
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| 170 | * (1 byte) Signature algorithm
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| 171 | * (2 bytes + ?) Signature
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| 172 | */
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| 173 | len = 4 + sct->sig_len;
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| 174 |
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| 175 | if (out != NULL) {
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| 176 | if (*out != NULL) {
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| 177 | p = *out;
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| 178 | *out += len;
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| 179 | } else {
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| 180 | pstart = p = OPENSSL_malloc(len);
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| 181 | if (p == NULL) {
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| 182 | CTerr(CT_F_I2O_SCT_SIGNATURE, ERR_R_MALLOC_FAILURE);
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| 183 | goto err;
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| 184 | }
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| 185 | *out = p;
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| 186 | }
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| 187 |
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| 188 | *p++ = sct->hash_alg;
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| 189 | *p++ = sct->sig_alg;
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| 190 | s2n(sct->sig_len, p);
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| 191 | memcpy(p, sct->sig, sct->sig_len);
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| 192 | }
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| 193 |
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| 194 | return len;
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| 195 | err:
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| 196 | OPENSSL_free(pstart);
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| 197 | return -1;
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| 198 | }
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| 199 |
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| 200 | int i2o_SCT(const SCT *sct, unsigned char **out)
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| 201 | {
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| 202 | size_t len;
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| 203 | unsigned char *p = NULL, *pstart = NULL;
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| 204 |
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| 205 | if (!SCT_is_complete(sct)) {
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| 206 | CTerr(CT_F_I2O_SCT, CT_R_SCT_NOT_SET);
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| 207 | goto err;
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| 208 | }
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| 209 | /*
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| 210 | * Fixed-length header: struct { (1 byte) Version sct_version; (32 bytes)
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| 211 | * log_id id; (8 bytes) uint64 timestamp; (2 bytes + ?) CtExtensions
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| 212 | * extensions; (1 byte) Hash algorithm (1 byte) Signature algorithm (2
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| 213 | * bytes + ?) Signature
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| 214 | */
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| 215 | if (sct->version == SCT_VERSION_V1)
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| 216 | len = 43 + sct->ext_len + 4 + sct->sig_len;
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| 217 | else
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| 218 | len = sct->sct_len;
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| 219 |
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| 220 | if (out == NULL)
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| 221 | return len;
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| 222 |
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| 223 | if (*out != NULL) {
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| 224 | p = *out;
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| 225 | *out += len;
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| 226 | } else {
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| 227 | pstart = p = OPENSSL_malloc(len);
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| 228 | if (p == NULL) {
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| 229 | CTerr(CT_F_I2O_SCT, ERR_R_MALLOC_FAILURE);
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| 230 | goto err;
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| 231 | }
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| 232 | *out = p;
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| 233 | }
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| 234 |
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| 235 | if (sct->version == SCT_VERSION_V1) {
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| 236 | *p++ = sct->version;
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| 237 | memcpy(p, sct->log_id, CT_V1_HASHLEN);
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| 238 | p += CT_V1_HASHLEN;
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| 239 | l2n8(sct->timestamp, p);
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| 240 | s2n(sct->ext_len, p);
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| 241 | if (sct->ext_len > 0) {
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| 242 | memcpy(p, sct->ext, sct->ext_len);
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| 243 | p += sct->ext_len;
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| 244 | }
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| 245 | if (i2o_SCT_signature(sct, &p) <= 0)
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| 246 | goto err;
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| 247 | } else {
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| 248 | memcpy(p, sct->sct, len);
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| 249 | }
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| 250 |
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| 251 | return len;
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| 252 | err:
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| 253 | OPENSSL_free(pstart);
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| 254 | return -1;
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| 255 | }
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| 256 |
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| 257 | STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
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| 258 | size_t len)
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| 259 | {
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| 260 | STACK_OF(SCT) *sk = NULL;
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| 261 | size_t list_len, sct_len;
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| 262 |
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| 263 | if (len < 2 || len > MAX_SCT_LIST_SIZE) {
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| 264 | CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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| 265 | return NULL;
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| 266 | }
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| 267 |
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| 268 | n2s(*pp, list_len);
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| 269 | if (list_len != len - 2) {
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| 270 | CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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| 271 | return NULL;
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| 272 | }
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| 273 |
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| 274 | if (a == NULL || *a == NULL) {
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| 275 | sk = sk_SCT_new_null();
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| 276 | if (sk == NULL)
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| 277 | return NULL;
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| 278 | } else {
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| 279 | SCT *sct;
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| 280 |
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| 281 | /* Use the given stack, but empty it first. */
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| 282 | sk = *a;
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| 283 | while ((sct = sk_SCT_pop(sk)) != NULL)
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| 284 | SCT_free(sct);
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| 285 | }
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| 286 |
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| 287 | while (list_len > 0) {
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| 288 | SCT *sct;
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| 289 |
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| 290 | if (list_len < 2) {
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| 291 | CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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| 292 | goto err;
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| 293 | }
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| 294 | n2s(*pp, sct_len);
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| 295 | list_len -= 2;
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| 296 |
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| 297 | if (sct_len == 0 || sct_len > list_len) {
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| 298 | CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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| 299 | goto err;
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| 300 | }
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| 301 | list_len -= sct_len;
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| 302 |
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| 303 | if ((sct = o2i_SCT(NULL, pp, sct_len)) == NULL)
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| 304 | goto err;
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| 305 | if (!sk_SCT_push(sk, sct)) {
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| 306 | SCT_free(sct);
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| 307 | goto err;
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| 308 | }
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| 309 | }
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| 310 |
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| 311 | if (a != NULL && *a == NULL)
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| 312 | *a = sk;
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| 313 | return sk;
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| 314 |
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| 315 | err:
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| 316 | if (a == NULL || *a == NULL)
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| 317 | SCT_LIST_free(sk);
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| 318 | return NULL;
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| 319 | }
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| 320 |
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| 321 | int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp)
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| 322 | {
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| 323 | int len, sct_len, i, is_pp_new = 0;
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| 324 | size_t len2;
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| 325 | unsigned char *p = NULL, *p2;
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| 326 |
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| 327 | if (pp != NULL) {
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| 328 | if (*pp == NULL) {
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| 329 | if ((len = i2o_SCT_LIST(a, NULL)) == -1) {
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| 330 | CTerr(CT_F_I2O_SCT_LIST, CT_R_SCT_LIST_INVALID);
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| 331 | return -1;
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| 332 | }
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| 333 | if ((*pp = OPENSSL_malloc(len)) == NULL) {
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| 334 | CTerr(CT_F_I2O_SCT_LIST, ERR_R_MALLOC_FAILURE);
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| 335 | return -1;
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| 336 | }
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| 337 | is_pp_new = 1;
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| 338 | }
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| 339 | p = *pp + 2;
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| 340 | }
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| 341 |
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| 342 | len2 = 2;
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| 343 | for (i = 0; i < sk_SCT_num(a); i++) {
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| 344 | if (pp != NULL) {
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| 345 | p2 = p;
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| 346 | p += 2;
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| 347 | if ((sct_len = i2o_SCT(sk_SCT_value(a, i), &p)) == -1)
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| 348 | goto err;
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| 349 | s2n(sct_len, p2);
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| 350 | } else {
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| 351 | if ((sct_len = i2o_SCT(sk_SCT_value(a, i), NULL)) == -1)
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| 352 | goto err;
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| 353 | }
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| 354 | len2 += 2 + sct_len;
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| 355 | }
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| 356 |
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| 357 | if (len2 > MAX_SCT_LIST_SIZE)
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| 358 | goto err;
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| 359 |
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| 360 | if (pp != NULL) {
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| 361 | p = *pp;
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| 362 | s2n(len2 - 2, p);
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| 363 | if (!is_pp_new)
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| 364 | *pp += len2;
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| 365 | }
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| 366 | return len2;
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| 367 |
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| 368 | err:
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| 369 | if (is_pp_new) {
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| 370 | OPENSSL_free(*pp);
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| 371 | *pp = NULL;
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| 372 | }
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| 373 | return -1;
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| 374 | }
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| 375 |
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| 376 | STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
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| 377 | long len)
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| 378 | {
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| 379 | ASN1_OCTET_STRING *oct = NULL;
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| 380 | STACK_OF(SCT) *sk = NULL;
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| 381 | const unsigned char *p;
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| 382 |
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| 383 | p = *pp;
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| 384 | if (d2i_ASN1_OCTET_STRING(&oct, &p, len) == NULL)
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| 385 | return NULL;
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| 386 |
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| 387 | p = oct->data;
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| 388 | if ((sk = o2i_SCT_LIST(a, &p, oct->length)) != NULL)
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| 389 | *pp += len;
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| 390 |
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| 391 | ASN1_OCTET_STRING_free(oct);
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| 392 | return sk;
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| 393 | }
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| 394 |
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| 395 | int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **out)
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| 396 | {
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| 397 | ASN1_OCTET_STRING oct;
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| 398 | int len;
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| 399 |
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| 400 | oct.data = NULL;
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| 401 | if ((oct.length = i2o_SCT_LIST(a, &oct.data)) == -1)
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| 402 | return -1;
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| 403 |
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| 404 | len = i2d_ASN1_OCTET_STRING(&oct, out);
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| 405 | OPENSSL_free(oct.data);
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| 406 | return len;
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| 407 | }
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