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Merge pull request #8182 from daverodgman/asn1write-size

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Reduce code size in mbedtls_asn1_write_len
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Dave Rodgman 2023-09-18 10:27:23 +00:00 committed by GitHub
commit 25c271a035
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 55 additions and 99 deletions
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154
library/asn1write.c
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@ -28,68 +28,40 @@
#include "mbedtls/platform.h"
#if defined(MBEDTLS_ASN1_PARSE_C)
#include "mbedtls/asn1.h"
#endif
int mbedtls_asn1_write_len(unsigned char **p, const unsigned char *start, size_t len)
{
if (len < 0x80) {
if (*p - start < 1) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
*--(*p) = (unsigned char) len;
return 1;
}
if (len <= 0xFF) {
if (*p - start < 2) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
*--(*p) = (unsigned char) len;
*--(*p) = 0x81;
return 2;
}
if (len <= 0xFFFF) {
if (*p - start < 3) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
*--(*p) = MBEDTLS_BYTE_0(len);
*--(*p) = MBEDTLS_BYTE_1(len);
*--(*p) = 0x82;
return 3;
}
if (len <= 0xFFFFFF) {
if (*p - start < 4) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
*--(*p) = MBEDTLS_BYTE_0(len);
*--(*p) = MBEDTLS_BYTE_1(len);
*--(*p) = MBEDTLS_BYTE_2(len);
*--(*p) = 0x83;
return 4;
}
int len_is_valid = 1;
#if SIZE_MAX > 0xFFFFFFFF
len_is_valid = (len <= 0xFFFFFFFF);
if (len > 0xFFFFFFFF) {
return MBEDTLS_ERR_ASN1_INVALID_LENGTH;
}
#endif
if (len_is_valid) {
if (*p - start < 5) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
*--(*p) = MBEDTLS_BYTE_0(len);
*--(*p) = MBEDTLS_BYTE_1(len);
*--(*p) = MBEDTLS_BYTE_2(len);
*--(*p) = MBEDTLS_BYTE_3(len);
*--(*p) = 0x84;
return 5;
int required = 1;
if (len >= 0x80) {
for (size_t l = len; l != 0; l >>= 8) {
required++;
}
}
return MBEDTLS_ERR_ASN1_INVALID_LENGTH;
if (required > (*p - start)) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
do {
*--(*p) = MBEDTLS_BYTE_0(len);
len >>= 8;
} while (len);
if (required > 1) {
*--(*p) = (unsigned char) (0x80 + required - 1);
}
return required;
}
int mbedtls_asn1_write_tag(unsigned char **p, const unsigned char *start, unsigned char tag)
@ -105,6 +77,19 @@ int mbedtls_asn1_write_tag(unsigned char **p, const unsigned char *start, unsign
#endif /* MBEDTLS_ASN1_WRITE_C || MBEDTLS_X509_USE_C */
#if defined(MBEDTLS_ASN1_WRITE_C)
static int mbedtls_asn1_write_len_and_tag(unsigned char **p,
const unsigned char *start,
size_t len,
unsigned char tag)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, tag));
return (int) len;
}
int mbedtls_asn1_write_raw_buffer(unsigned char **p, const unsigned char *start,
const unsigned char *buf, size_t size)
{
@ -156,10 +141,7 @@ int mbedtls_asn1_write_mpi(unsigned char **p, const unsigned char *start, const
len += 1;
}
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_INTEGER));
ret = (int) len;
ret = mbedtls_asn1_write_len_and_tag(p, start, len, MBEDTLS_ASN1_INTEGER);
cleanup:
return ret;
@ -168,15 +150,9 @@ cleanup:
int mbedtls_asn1_write_null(unsigned char **p, const unsigned char *start)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len = 0;
// Write NULL
//
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, 0));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_NULL));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, 0, MBEDTLS_ASN1_NULL);
}
int mbedtls_asn1_write_oid(unsigned char **p, const unsigned char *start,
@ -187,10 +163,7 @@ int mbedtls_asn1_write_oid(unsigned char **p, const unsigned char *start,
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start,
(const unsigned char *) oid, oid_len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OID));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len, MBEDTLS_ASN1_OID);
}
int mbedtls_asn1_write_algorithm_identifier(unsigned char **p, const unsigned char *start,
@ -217,17 +190,12 @@ int mbedtls_asn1_write_algorithm_identifier_ext(unsigned char **p, const unsigne
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid, oid_len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start,
MBEDTLS_ASN1_CONSTRUCTED |
MBEDTLS_ASN1_SEQUENCE));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE);
}
int mbedtls_asn1_write_bool(unsigned char **p, const unsigned char *start, int boolean)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len = 0;
if (*p - start < 1) {
@ -237,15 +205,11 @@ int mbedtls_asn1_write_bool(unsigned char **p, const unsigned char *start, int b
*--(*p) = (boolean) ? 255 : 0;
len++;
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_BOOLEAN));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len, MBEDTLS_ASN1_BOOLEAN);
}
static int asn1_write_tagged_int(unsigned char **p, const unsigned char *start, int val, int tag)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len = 0;
do {
@ -265,10 +229,7 @@ static int asn1_write_tagged_int(unsigned char **p, const unsigned char *start,
len += 1;
}
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, tag));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len, tag);
}
int mbedtls_asn1_write_int(unsigned char **p, const unsigned char *start, int val)
@ -291,10 +252,7 @@ int mbedtls_asn1_write_tagged_string(unsigned char **p, const unsigned char *sta
(const unsigned char *) text,
text_len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, tag));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len, tag);
}
int mbedtls_asn1_write_utf8_string(unsigned char **p, const unsigned char *start,
@ -363,7 +321,6 @@ int mbedtls_asn1_write_named_bitstring(unsigned char **p,
int mbedtls_asn1_write_bitstring(unsigned char **p, const unsigned char *start,
const unsigned char *buf, size_t bits)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len = 0;
size_t unused_bits, byte_len;
@ -387,10 +344,7 @@ int mbedtls_asn1_write_bitstring(unsigned char **p, const unsigned char *start,
/* Write unused bits */
*--(*p) = (unsigned char) unused_bits;
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_BIT_STRING));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len, MBEDTLS_ASN1_BIT_STRING);
}
int mbedtls_asn1_write_octet_string(unsigned char **p, const unsigned char *start,
@ -401,13 +355,11 @@ int mbedtls_asn1_write_octet_string(unsigned char **p, const unsigned char *star
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, buf, size));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OCTET_STRING));
return (int) len;
return mbedtls_asn1_write_len_and_tag(p, start, len, MBEDTLS_ASN1_OCTET_STRING);
}
#if !defined(MBEDTLS_ASN1_PARSE_C)
/* This is a copy of the ASN.1 parsing function mbedtls_asn1_find_named_data(),
* which is replicated to avoid a dependency ASN1_WRITE_C on ASN1_PARSE_C. */
static mbedtls_asn1_named_data *asn1_find_named_data(
@ -425,6 +377,10 @@ static mbedtls_asn1_named_data *asn1_find_named_data(
return list;
}
#else
#define asn1_find_named_data(list, oid, len) \
((mbedtls_asn1_named_data *) mbedtls_asn1_find_named_data(list, oid, len))
#endif
mbedtls_asn1_named_data *mbedtls_asn1_store_named_data(
mbedtls_asn1_named_data **head,