Squashed commit upgrading to mbedtls-2.28.1
Squash merging branch import/mbedtls-2.28.1
ebf1f6a58089 ("libmbedtls: compile new files added with 2.28.1")
3ffb51b58a54 ("libmbedtls: add SM2 curve")
c425755720b4 ("libmbedtls: mbedtls_mpi_exp_mod(): optimize mempool usage")
23493c822a82 ("libmbedtls: mbedtls_mpi_exp_mod(): reduce stack usage")
dcdca2348dff ("libmbedtls: mbedtls_mpi_exp_mod() initialize W")
dc2994976958 ("libmbedtls: fix no CRT issue")
c6628873b281 ("libmbedtls: add interfaces in mbedtls for context memory operation")
8acd202d3e55 ("libmedtls: mpi_miller_rabin: increase count limit")
37284e28d5d9 ("libmbedtls: add mbedtls_mpi_init_mempool()")
b499a75f29f3 ("libmbedtls: make mbedtls_mpi_mont*() available")
2080a8c96a5d ("mbedtls: configure mbedtls to reach for config")
e0858334327a ("mbedtls: remove default include/mbedtls/config.h")
dd9688e6b8ce ("Import mbedtls-2.28.1")
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/lib/libmbedtls/mbedtls/library/base64.c b/lib/libmbedtls/mbedtls/library/base64.c
index 1a05226..83daa0b 100644
--- a/lib/libmbedtls/mbedtls/library/base64.c
+++ b/lib/libmbedtls/mbedtls/library/base64.c
@@ -22,6 +22,7 @@
#if defined(MBEDTLS_BASE64_C)
#include "mbedtls/base64.h"
+#include "constant_time_internal.h"
#include <stdint.h>
@@ -35,130 +36,9 @@
#endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST */
-static const unsigned char base64_enc_map[64] =
-{
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
- 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
- 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
- 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
- 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
- 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
- '8', '9', '+', '/'
-};
-
-static const unsigned char base64_dec_map[128] =
-{
- 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
- 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
- 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
- 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
- 127, 127, 127, 62, 127, 127, 127, 63, 52, 53,
- 54, 55, 56, 57, 58, 59, 60, 61, 127, 127,
- 127, 64, 127, 127, 127, 0, 1, 2, 3, 4,
- 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
- 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
- 25, 127, 127, 127, 127, 127, 127, 26, 27, 28,
- 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
- 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
- 49, 50, 51, 127, 127, 127, 127, 127
-};
-
#define BASE64_SIZE_T_MAX ( (size_t) -1 ) /* SIZE_T_MAX is not standard */
/*
- * Constant flow conditional assignment to unsigned char
- */
-static void mbedtls_base64_cond_assign_uchar( unsigned char * dest, const unsigned char * const src,
- unsigned char condition )
-{
- /* MSVC has a warning about unary minus on unsigned integer types,
- * but this is well-defined and precisely what we want to do here. */
-#if defined(_MSC_VER)
-#pragma warning( push )
-#pragma warning( disable : 4146 )
-#endif
-
- /* Generate bitmask from condition, mask will either be 0xFF or 0 */
- unsigned char mask = ( condition | -condition );
- mask >>= 7;
- mask = -mask;
-
-#if defined(_MSC_VER)
-#pragma warning( pop )
-#endif
-
- *dest = ( ( *src ) & mask ) | ( ( *dest ) & ~mask );
-}
-
-/*
- * Constant flow conditional assignment to uint_32
- */
-static void mbedtls_base64_cond_assign_uint32( uint32_t * dest, const uint32_t src,
- uint32_t condition )
-{
- /* MSVC has a warning about unary minus on unsigned integer types,
- * but this is well-defined and precisely what we want to do here. */
-#if defined(_MSC_VER)
-#pragma warning( push )
-#pragma warning( disable : 4146 )
-#endif
-
- /* Generate bitmask from condition, mask will either be 0xFFFFFFFF or 0 */
- uint32_t mask = ( condition | -condition );
- mask >>= 31;
- mask = -mask;
-
-#if defined(_MSC_VER)
-#pragma warning( pop )
-#endif
-
- *dest = ( src & mask ) | ( ( *dest ) & ~mask );
-}
-
-/*
- * Constant flow check for equality
- */
-static unsigned char mbedtls_base64_eq( size_t in_a, size_t in_b )
-{
- size_t difference = in_a ^ in_b;
-
- /* MSVC has a warning about unary minus on unsigned integer types,
- * but this is well-defined and precisely what we want to do here. */
-#if defined(_MSC_VER)
-#pragma warning( push )
-#pragma warning( disable : 4146 )
-#endif
-
- difference |= -difference;
-
-#if defined(_MSC_VER)
-#pragma warning( pop )
-#endif
-
- /* cope with the varying size of size_t per platform */
- difference >>= ( sizeof( difference ) * 8 - 1 );
-
- return (unsigned char) ( 1 ^ difference );
-}
-
-/*
- * Constant flow lookup into table.
- */
-static unsigned char mbedtls_base64_table_lookup( const unsigned char * const table,
- const size_t table_size, const size_t table_index )
-{
- size_t i;
- unsigned char result = 0;
-
- for( i = 0; i < table_size; ++i )
- {
- mbedtls_base64_cond_assign_uchar( &result, &table[i], mbedtls_base64_eq( i, table_index ) );
- }
-
- return result;
-}
-
-/*
* Encode a buffer into base64 format
*/
int mbedtls_base64_encode( unsigned char *dst, size_t dlen, size_t *olen,
@@ -198,17 +78,12 @@
C2 = *src++;
C3 = *src++;
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( ( C1 >> 2 ) & 0x3F ) );
-
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) ) & 0x3F ) );
-
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( ( ( ( C2 & 15 ) << 2 ) + ( C3 >> 6 ) ) & 0x3F ) );
-
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( C3 & 0x3F ) );
+ *p++ = mbedtls_ct_base64_enc_char( ( C1 >> 2 ) & 0x3F );
+ *p++ = mbedtls_ct_base64_enc_char( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) )
+ & 0x3F );
+ *p++ = mbedtls_ct_base64_enc_char( ( ( ( C2 & 15 ) << 2 ) + ( C3 >> 6 ) )
+ & 0x3F );
+ *p++ = mbedtls_ct_base64_enc_char( C3 & 0x3F );
}
if( i < slen )
@@ -216,15 +91,12 @@
C1 = *src++;
C2 = ( ( i + 1 ) < slen ) ? *src++ : 0;
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( ( C1 >> 2 ) & 0x3F ) );
-
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) ) & 0x3F ) );
+ *p++ = mbedtls_ct_base64_enc_char( ( C1 >> 2 ) & 0x3F );
+ *p++ = mbedtls_ct_base64_enc_char( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) )
+ & 0x3F );
if( ( i + 1 ) < slen )
- *p++ = mbedtls_base64_table_lookup( base64_enc_map, sizeof( base64_enc_map ),
- ( ( ( C2 & 15 ) << 2 ) & 0x3F ) );
+ *p++ = mbedtls_ct_base64_enc_char( ( ( C2 & 15 ) << 2 ) & 0x3F );
else *p++ = '=';
*p++ = '=';
@@ -242,20 +114,23 @@
int mbedtls_base64_decode( unsigned char *dst, size_t dlen, size_t *olen,
const unsigned char *src, size_t slen )
{
- size_t i, n;
- uint32_t j, x;
+ size_t i; /* index in source */
+ size_t n; /* number of digits or trailing = in source */
+ uint32_t x; /* value accumulator */
+ unsigned accumulated_digits = 0;
+ unsigned equals = 0;
+ int spaces_present = 0;
unsigned char *p;
- unsigned char dec_map_lookup;
/* First pass: check for validity and get output length */
- for( i = n = j = 0; i < slen; i++ )
+ for( i = n = 0; i < slen; i++ )
{
/* Skip spaces before checking for EOL */
- x = 0;
+ spaces_present = 0;
while( i < slen && src[i] == ' ' )
{
++i;
- ++x;
+ spaces_present = 1;
}
/* Spaces at end of buffer are OK */
@@ -270,20 +145,24 @@
continue;
/* Space inside a line is an error */
- if( x != 0 )
+ if( spaces_present )
return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
- if( src[i] == '=' && ++j > 2 )
+ if( src[i] > 127 )
return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
- dec_map_lookup = mbedtls_base64_table_lookup( base64_dec_map, sizeof( base64_dec_map ), src[i] );
-
- if( src[i] > 127 || dec_map_lookup == 127 )
- return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
-
- if( dec_map_lookup < 64 && j != 0 )
- return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
-
+ if( src[i] == '=' )
+ {
+ if( ++equals > 2 )
+ return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
+ }
+ else
+ {
+ if( equals != 0 )
+ return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
+ if( mbedtls_ct_base64_dec_value( src[i] ) < 0 )
+ return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
+ }
n++;
}
@@ -298,7 +177,7 @@
* n = ( ( n * 6 ) + 7 ) >> 3;
*/
n = ( 6 * ( n >> 3 ) ) + ( ( 6 * ( n & 0x7 ) + 7 ) >> 3 );
- n -= j;
+ n -= equals;
if( dst == NULL || dlen < n )
{
@@ -306,22 +185,24 @@
return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
}
- for( j = 3, n = x = 0, p = dst; i > 0; i--, src++ )
- {
+ equals = 0;
+ for( x = 0, p = dst; i > 0; i--, src++ )
+ {
if( *src == '\r' || *src == '\n' || *src == ' ' )
continue;
- dec_map_lookup = mbedtls_base64_table_lookup( base64_dec_map, sizeof( base64_dec_map ), *src );
+ x = x << 6;
+ if( *src == '=' )
+ ++equals;
+ else
+ x |= mbedtls_ct_base64_dec_value( *src );
- mbedtls_base64_cond_assign_uint32( &j, j - 1, mbedtls_base64_eq( dec_map_lookup, 64 ) );
- x = ( x << 6 ) | ( dec_map_lookup & 0x3F );
-
- if( ++n == 4 )
+ if( ++accumulated_digits == 4 )
{
- n = 0;
- if( j > 0 ) *p++ = (unsigned char)( x >> 16 );
- if( j > 1 ) *p++ = (unsigned char)( x >> 8 );
- if( j > 2 ) *p++ = (unsigned char)( x );
+ accumulated_digits = 0;
+ *p++ = MBEDTLS_BYTE_2( x );
+ if( equals <= 1 ) *p++ = MBEDTLS_BYTE_1( x );
+ if( equals <= 0 ) *p++ = MBEDTLS_BYTE_0( x );
}
}