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Packit |
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/*
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c4476c |
* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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Packit |
c4476c |
*
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c4476c |
* Licensed under the OpenSSL license (the "License"). You may not use
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Packit |
c4476c |
* this file except in compliance with the License. You can obtain a copy
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Packit |
c4476c |
* in the file LICENSE in the source distribution or at
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Packit |
c4476c |
* https://www.openssl.org/source/license.html
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Packit |
c4476c |
*/
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Packit |
c4476c |
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Packit |
c4476c |
#ifdef OPENSSL_NO_CT
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c4476c |
# error "CT is disabled"
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c4476c |
#endif
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c4476c |
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c4476c |
#include <limits.h>
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c4476c |
#include <string.h>
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c4476c |
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c4476c |
#include <openssl/asn1.h>
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c4476c |
#include <openssl/buffer.h>
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c4476c |
#include <openssl/ct.h>
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c4476c |
#include <openssl/err.h>
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c4476c |
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c4476c |
#include "ct_local.h"
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c4476c |
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c4476c |
int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len)
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Packit |
c4476c |
{
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|
Packit |
c4476c |
size_t siglen;
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c4476c |
size_t len_remaining = len;
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c4476c |
const unsigned char *p;
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c4476c |
|
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c4476c |
if (sct->version != SCT_VERSION_V1) {
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c4476c |
CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_UNSUPPORTED_VERSION);
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c4476c |
return -1;
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|
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c4476c |
}
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Packit |
c4476c |
/*
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c4476c |
* digitally-signed struct header: (1 byte) Hash algorithm (1 byte)
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c4476c |
* Signature algorithm (2 bytes + ?) Signature
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c4476c |
*
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c4476c |
* This explicitly rejects empty signatures: they're invalid for
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c4476c |
* all supported algorithms.
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c4476c |
*/
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c4476c |
if (len <= 4) {
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|
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c4476c |
CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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c4476c |
return -1;
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c4476c |
}
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c4476c |
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c4476c |
p = *in;
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c4476c |
/* Get hash and signature algorithm */
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c4476c |
sct->hash_alg = *p++;
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c4476c |
sct->sig_alg = *p++;
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c4476c |
if (SCT_get_signature_nid(sct) == NID_undef) {
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c4476c |
CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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c4476c |
return -1;
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|
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c4476c |
}
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|
Packit |
c4476c |
/* Retrieve signature and check it is consistent with the buffer length */
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c4476c |
n2s(p, siglen);
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c4476c |
len_remaining -= (p - *in);
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c4476c |
if (siglen > len_remaining) {
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c4476c |
CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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c4476c |
return -1;
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c4476c |
}
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c4476c |
|
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c4476c |
if (SCT_set1_signature(sct, p, siglen) != 1)
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c4476c |
return -1;
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c4476c |
len_remaining -= siglen;
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c4476c |
*in = p + siglen;
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c4476c |
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c4476c |
return len - len_remaining;
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Packit |
c4476c |
}
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c4476c |
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c4476c |
SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len)
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c4476c |
{
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c4476c |
SCT *sct = NULL;
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c4476c |
const unsigned char *p;
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c4476c |
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c4476c |
if (len == 0 || len > MAX_SCT_SIZE) {
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Packit |
c4476c |
CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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Packit |
c4476c |
goto err;
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c4476c |
}
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c4476c |
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Packit |
c4476c |
if ((sct = SCT_new()) == NULL)
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c4476c |
goto err;
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c4476c |
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c4476c |
p = *in;
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c4476c |
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c4476c |
sct->version = *p;
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c4476c |
if (sct->version == SCT_VERSION_V1) {
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c4476c |
int sig_len;
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c4476c |
size_t len2;
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Packit |
c4476c |
/*-
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c4476c |
* Fixed-length header:
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c4476c |
* struct {
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|
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c4476c |
* Version sct_version; (1 byte)
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c4476c |
* log_id id; (32 bytes)
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c4476c |
* uint64 timestamp; (8 bytes)
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|
Packit |
c4476c |
* CtExtensions extensions; (2 bytes + ?)
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Packit |
c4476c |
* }
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Packit |
c4476c |
*/
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Packit |
c4476c |
if (len < 43) {
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|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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|
Packit |
c4476c |
goto err;
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Packit |
c4476c |
}
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c4476c |
len -= 43;
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Packit |
c4476c |
p++;
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c4476c |
sct->log_id = BUF_memdup(p, CT_V1_HASHLEN);
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Packit |
c4476c |
if (sct->log_id == NULL)
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Packit |
c4476c |
goto err;
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Packit |
c4476c |
sct->log_id_len = CT_V1_HASHLEN;
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c4476c |
p += CT_V1_HASHLEN;
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c4476c |
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c4476c |
n2l8(p, sct->timestamp);
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c4476c |
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Packit |
c4476c |
n2s(p, len2);
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Packit |
c4476c |
if (len < len2) {
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|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
}
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|
Packit |
c4476c |
if (len2 > 0) {
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|
Packit |
c4476c |
sct->ext = BUF_memdup(p, len2);
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|
Packit |
c4476c |
if (sct->ext == NULL)
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Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
}
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Packit |
c4476c |
sct->ext_len = len2;
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|
Packit |
c4476c |
p += len2;
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Packit |
c4476c |
len -= len2;
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Packit |
c4476c |
|
|
Packit |
c4476c |
sig_len = o2i_SCT_signature(sct, &p, len);
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|
Packit |
c4476c |
if (sig_len <= 0) {
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|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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|
Packit |
c4476c |
goto err;
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Packit |
c4476c |
}
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|
Packit |
c4476c |
len -= sig_len;
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Packit |
c4476c |
*in = p + len;
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|
Packit |
c4476c |
} else {
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|
Packit |
c4476c |
/* If not V1 just cache encoding */
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|
Packit |
c4476c |
sct->sct = BUF_memdup(p, len);
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|
Packit |
c4476c |
if (sct->sct == NULL)
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|
Packit |
c4476c |
goto err;
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Packit |
c4476c |
sct->sct_len = len;
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Packit |
c4476c |
*in = p + len;
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Packit |
c4476c |
}
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Packit |
c4476c |
|
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Packit |
c4476c |
if (psct != NULL) {
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Packit |
c4476c |
SCT_free(*psct);
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Packit |
c4476c |
*psct = sct;
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|
Packit |
c4476c |
}
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|
Packit |
c4476c |
|
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Packit |
c4476c |
return sct;
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|
Packit |
c4476c |
err:
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|
Packit |
c4476c |
SCT_free(sct);
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|
Packit |
c4476c |
return NULL;
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|
Packit |
c4476c |
}
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Packit |
c4476c |
|
|
Packit |
c4476c |
int i2o_SCT_signature(const SCT *sct, unsigned char **out)
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Packit |
c4476c |
{
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|
Packit |
c4476c |
size_t len;
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Packit |
c4476c |
unsigned char *p = NULL, *pstart = NULL;
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!SCT_signature_is_complete(sct)) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
}
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (sct->version != SCT_VERSION_V1) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_UNSUPPORTED_VERSION);
|
|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* (1 byte) Hash algorithm
|
|
Packit |
c4476c |
* (1 byte) Signature algorithm
|
|
Packit |
c4476c |
* (2 bytes + ?) Signature
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
len = 4 + sct->sig_len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (out != NULL) {
|
|
Packit |
c4476c |
if (*out != NULL) {
|
|
Packit |
c4476c |
p = *out;
|
|
Packit |
c4476c |
*out += len;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
pstart = p = OPENSSL_malloc(len);
|
|
Packit |
c4476c |
if (p == NULL) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT_SIGNATURE, ERR_R_MALLOC_FAILURE);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
*out = p;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
*p++ = sct->hash_alg;
|
|
Packit |
c4476c |
*p++ = sct->sig_alg;
|
|
Packit |
c4476c |
s2n(sct->sig_len, p);
|
|
Packit |
c4476c |
memcpy(p, sct->sig, sct->sig_len);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
return len;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
OPENSSL_free(pstart);
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int i2o_SCT(const SCT *sct, unsigned char **out)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
size_t len;
|
|
Packit |
c4476c |
unsigned char *p = NULL, *pstart = NULL;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!SCT_is_complete(sct)) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT, CT_R_SCT_NOT_SET);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* Fixed-length header: struct { (1 byte) Version sct_version; (32 bytes)
|
|
Packit |
c4476c |
* log_id id; (8 bytes) uint64 timestamp; (2 bytes + ?) CtExtensions
|
|
Packit |
c4476c |
* extensions; (1 byte) Hash algorithm (1 byte) Signature algorithm (2
|
|
Packit |
c4476c |
* bytes + ?) Signature
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
if (sct->version == SCT_VERSION_V1)
|
|
Packit |
c4476c |
len = 43 + sct->ext_len + 4 + sct->sig_len;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
len = sct->sct_len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (out == NULL)
|
|
Packit |
c4476c |
return len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (*out != NULL) {
|
|
Packit |
c4476c |
p = *out;
|
|
Packit |
c4476c |
*out += len;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
pstart = p = OPENSSL_malloc(len);
|
|
Packit |
c4476c |
if (p == NULL) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT, ERR_R_MALLOC_FAILURE);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
*out = p;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (sct->version == SCT_VERSION_V1) {
|
|
Packit |
c4476c |
*p++ = sct->version;
|
|
Packit |
c4476c |
memcpy(p, sct->log_id, CT_V1_HASHLEN);
|
|
Packit |
c4476c |
p += CT_V1_HASHLEN;
|
|
Packit |
c4476c |
l2n8(sct->timestamp, p);
|
|
Packit |
c4476c |
s2n(sct->ext_len, p);
|
|
Packit |
c4476c |
if (sct->ext_len > 0) {
|
|
Packit |
c4476c |
memcpy(p, sct->ext, sct->ext_len);
|
|
Packit |
c4476c |
p += sct->ext_len;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
if (i2o_SCT_signature(sct, &p) <= 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
memcpy(p, sct->sct, len);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
return len;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
OPENSSL_free(pstart);
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
|
|
Packit |
c4476c |
size_t len)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
STACK_OF(SCT) *sk = NULL;
|
|
Packit |
c4476c |
size_t list_len, sct_len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (len < 2 || len > MAX_SCT_LIST_SIZE) {
|
|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
|
|
Packit |
c4476c |
return NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
n2s(*pp, list_len);
|
|
Packit |
c4476c |
if (list_len != len - 2) {
|
|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
|
|
Packit |
c4476c |
return NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (a == NULL || *a == NULL) {
|
|
Packit |
c4476c |
sk = sk_SCT_new_null();
|
|
Packit |
c4476c |
if (sk == NULL)
|
|
Packit |
c4476c |
return NULL;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
SCT *sct;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* Use the given stack, but empty it first. */
|
|
Packit |
c4476c |
sk = *a;
|
|
Packit |
c4476c |
while ((sct = sk_SCT_pop(sk)) != NULL)
|
|
Packit |
c4476c |
SCT_free(sct);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
while (list_len > 0) {
|
|
Packit |
c4476c |
SCT *sct;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (list_len < 2) {
|
|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
n2s(*pp, sct_len);
|
|
Packit |
c4476c |
list_len -= 2;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (sct_len == 0 || sct_len > list_len) {
|
|
Packit |
c4476c |
CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
list_len -= sct_len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((sct = o2i_SCT(NULL, pp, sct_len)) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!sk_SCT_push(sk, sct)) {
|
|
Packit |
c4476c |
SCT_free(sct);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (a != NULL && *a == NULL)
|
|
Packit |
c4476c |
*a = sk;
|
|
Packit |
c4476c |
return sk;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
if (a == NULL || *a == NULL)
|
|
Packit |
c4476c |
SCT_LIST_free(sk);
|
|
Packit |
c4476c |
return NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
int len, sct_len, i, is_pp_new = 0;
|
|
Packit |
c4476c |
size_t len2;
|
|
Packit |
c4476c |
unsigned char *p = NULL, *p2;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (pp != NULL) {
|
|
Packit |
c4476c |
if (*pp == NULL) {
|
|
Packit |
c4476c |
if ((len = i2o_SCT_LIST(a, NULL)) == -1) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT_LIST, CT_R_SCT_LIST_INVALID);
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
if ((*pp = OPENSSL_malloc(len)) == NULL) {
|
|
Packit |
c4476c |
CTerr(CT_F_I2O_SCT_LIST, ERR_R_MALLOC_FAILURE);
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
is_pp_new = 1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
p = *pp + 2;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
len2 = 2;
|
|
Packit |
c4476c |
for (i = 0; i < sk_SCT_num(a); i++) {
|
|
Packit |
c4476c |
if (pp != NULL) {
|
|
Packit |
c4476c |
p2 = p;
|
|
Packit |
c4476c |
p += 2;
|
|
Packit |
c4476c |
if ((sct_len = i2o_SCT(sk_SCT_value(a, i), &p)) == -1)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
s2n(sct_len, p2);
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
if ((sct_len = i2o_SCT(sk_SCT_value(a, i), NULL)) == -1)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
len2 += 2 + sct_len;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (len2 > MAX_SCT_LIST_SIZE)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (pp != NULL) {
|
|
Packit |
c4476c |
p = *pp;
|
|
Packit |
c4476c |
s2n(len2 - 2, p);
|
|
Packit |
c4476c |
if (!is_pp_new)
|
|
Packit |
c4476c |
*pp += len2;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
return len2;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
if (is_pp_new) {
|
|
Packit |
c4476c |
OPENSSL_free(*pp);
|
|
Packit |
c4476c |
*pp = NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
|
|
Packit |
c4476c |
long len)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
ASN1_OCTET_STRING *oct = NULL;
|
|
Packit |
c4476c |
STACK_OF(SCT) *sk = NULL;
|
|
Packit |
c4476c |
const unsigned char *p;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
p = *pp;
|
|
Packit |
c4476c |
if (d2i_ASN1_OCTET_STRING(&oct, &p, len) == NULL)
|
|
Packit |
c4476c |
return NULL;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
p = oct->data;
|
|
Packit |
c4476c |
if ((sk = o2i_SCT_LIST(a, &p, oct->length)) != NULL)
|
|
Packit |
c4476c |
*pp += len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ASN1_OCTET_STRING_free(oct);
|
|
Packit |
c4476c |
return sk;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **out)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
ASN1_OCTET_STRING oct;
|
|
Packit |
c4476c |
int len;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
oct.data = NULL;
|
|
Packit |
c4476c |
if ((oct.length = i2o_SCT_LIST(a, &oct.data)) == -1)
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
len = i2d_ASN1_OCTET_STRING(&oct, out);
|
|
Packit |
c4476c |
OPENSSL_free(oct.data);
|
|
Packit |
c4476c |
return len;
|
|
Packit |
c4476c |
}
|