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Rename functions to have suitable name

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei
2021-11-15 16:03:24 +01:00
parent 74217ee03c
commit b8d78926eb
3 changed files with 32 additions and 32 deletions
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48
library/base64.c
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@ -43,9 +43,9 @@
* Constant flow with respect to c.
*/
MBEDTLS_STATIC_TESTABLE
unsigned char mbedtls_base64_mask_of_range( unsigned char low,
unsigned char high,
unsigned char c )
unsigned char mbedtls_ct_uchar_mask_of_range( unsigned char low,
unsigned char high,
unsigned char c )
{
/* low_mask is: 0 if low <= c, 0x...ff if low > c */
unsigned low_mask = ( (unsigned) c - low ) >> 8;
@ -59,17 +59,17 @@ unsigned char mbedtls_base64_mask_of_range( unsigned char low,
* but not EBCDIC).
*/
MBEDTLS_STATIC_TESTABLE
unsigned char mbedtls_base64_enc_char( unsigned char val )
unsigned char mbedtls_ct_base64_enc_char( unsigned char val )
{
unsigned char digit = 0;
/* For each range of values, if val is in that range, mask digit with
* the corresponding value. Since val can only be in a single range,
* only at most one masking will change digit. */
digit |= mbedtls_base64_mask_of_range( 0, 25, val ) & ( 'A' + val );
digit |= mbedtls_base64_mask_of_range( 26, 51, val ) & ( 'a' + val - 26 );
digit |= mbedtls_base64_mask_of_range( 52, 61, val ) & ( '0' + val - 52 );
digit |= mbedtls_base64_mask_of_range( 62, 62, val ) & '+';
digit |= mbedtls_base64_mask_of_range( 63, 63, val ) & '/';
digit |= mbedtls_ct_uchar_mask_of_range( 0, 25, val ) & ( 'A' + val );
digit |= mbedtls_ct_uchar_mask_of_range( 26, 51, val ) & ( 'a' + val - 26 );
digit |= mbedtls_ct_uchar_mask_of_range( 52, 61, val ) & ( '0' + val - 52 );
digit |= mbedtls_ct_uchar_mask_of_range( 62, 62, val ) & '+';
digit |= mbedtls_ct_uchar_mask_of_range( 63, 63, val ) & '/';
return( digit );
}
@ -113,12 +113,12 @@ int mbedtls_base64_encode( unsigned char *dst, size_t dlen, size_t *olen,
C2 = *src++;
C3 = *src++;
*p++ = mbedtls_base64_enc_char( ( C1 >> 2 ) & 0x3F );
*p++ = mbedtls_base64_enc_char( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) )
*p++ = mbedtls_ct_base64_enc_char( ( C1 >> 2 ) & 0x3F );
*p++ = mbedtls_ct_base64_enc_char( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) )
& 0x3F );
*p++ = mbedtls_base64_enc_char( ( ( ( C2 & 15 ) << 2 ) + ( C3 >> 6 ) )
*p++ = mbedtls_ct_base64_enc_char( ( ( ( C2 & 15 ) << 2 ) + ( C3 >> 6 ) )
& 0x3F );
*p++ = mbedtls_base64_enc_char( C3 & 0x3F );
*p++ = mbedtls_ct_base64_enc_char( C3 & 0x3F );
}
if( i < slen )
@ -126,12 +126,12 @@ int mbedtls_base64_encode( unsigned char *dst, size_t dlen, size_t *olen,
C1 = *src++;
C2 = ( ( i + 1 ) < slen ) ? *src++ : 0;
*p++ = mbedtls_base64_enc_char( ( C1 >> 2 ) & 0x3F );
*p++ = mbedtls_base64_enc_char( ( ( ( C1 & 3 ) << 4 ) + ( C2 >> 4 ) )
*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_enc_char( ( ( C2 & 15 ) << 2 ) & 0x3F );
*p++ = mbedtls_ct_base64_enc_char( ( ( C2 & 15 ) << 2 ) & 0x3F );
else *p++ = '=';
*p++ = '=';
@ -155,18 +155,18 @@ int mbedtls_base64_encode( unsigned char *dst, size_t dlen, size_t *olen,
* access.
*/
MBEDTLS_STATIC_TESTABLE
signed char mbedtls_base64_dec_value( unsigned char c )
signed char mbedtls_ct_base64_dec_value( unsigned char c )
{
unsigned char val = 0;
/* For each range of digits, if c is in that range, mask val with
* the corresponding value. Since c can only be in a single range,
* only at most one masking will change val. Set val to one plus
* the desired value so that it stays 0 if c is in none of the ranges. */
val |= mbedtls_base64_mask_of_range( 'A', 'Z', c ) & ( c - 'A' + 0 + 1 );
val |= mbedtls_base64_mask_of_range( 'a', 'z', c ) & ( c - 'a' + 26 + 1 );
val |= mbedtls_base64_mask_of_range( '0', '9', c ) & ( c - '0' + 52 + 1 );
val |= mbedtls_base64_mask_of_range( '+', '+', c ) & ( c - '+' + 62 + 1 );
val |= mbedtls_base64_mask_of_range( '/', '/', c ) & ( c - '/' + 63 + 1 );
val |= mbedtls_ct_uchar_mask_of_range( 'A', 'Z', c ) & ( c - 'A' + 0 + 1 );
val |= mbedtls_ct_uchar_mask_of_range( 'a', 'z', c ) & ( c - 'a' + 26 + 1 );
val |= mbedtls_ct_uchar_mask_of_range( '0', '9', c ) & ( c - '0' + 52 + 1 );
val |= mbedtls_ct_uchar_mask_of_range( '+', '+', c ) & ( c - '+' + 62 + 1 );
val |= mbedtls_ct_uchar_mask_of_range( '/', '/', c ) & ( c - '/' + 63 + 1 );
/* At this point, val is 0 if c is an invalid digit and v+1 if c is
* a digit with the value v. */
return( val - 1 );
@ -224,7 +224,7 @@ int mbedtls_base64_decode( unsigned char *dst, size_t dlen, size_t *olen,
{
if( equals != 0 )
return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
if( mbedtls_base64_dec_value( src[i] ) < 0 )
if( mbedtls_ct_base64_dec_value( src[i] ) < 0 )
return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
}
n++;
@ -259,7 +259,7 @@ int mbedtls_base64_decode( unsigned char *dst, size_t dlen, size_t *olen,
if( *src == '=' )
++equals;
else
x |= mbedtls_base64_dec_value( *src );
x |= mbedtls_ct_base64_dec_value( *src );
if( ++accumulated_digits == 4 )
{