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Add comment to integer overflow fix in base64.c

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Adds clarifying comment to the integer overflow fix in base64.c
This commit is contained in:
Simon Butcher 2017-02-02 08:46:53 +00:00
parent d00d3e250e
commit 2b912b4eea
1 changed files with 4 additions and 0 deletions
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4
library/base64.c
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@ -192,6 +192,10 @@ int mbedtls_base64_decode( unsigned char *dst, size_t dlen, size_t *olen,
return( 0 );
}
/* The following expression is to calculate the following formula without
* risk of integer overflow in n:
* n = ( ( n * 6 ) + 7 ) >> 3;
*/
n = ( 6 * ( n >> 3 ) ) + ( ( 6 * ( n & 0x7 ) + 7 ) >> 3 );
n -= j;