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- Autosize POLARSSL_MPI_RW_BUFFER_SIZE at compile time

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This commit is contained in:
Paul Bakker 2012-09-27 20:42:35 +00:00
parent 31417a71f8
commit f918310193
1 changed files with 12 additions and 1 deletions
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13
include/polarssl/bignum.h
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@ -77,8 +77,19 @@
* *
* By default we assume at least a 10 char label, a minimum radix of 10 * By default we assume at least a 10 char label, a minimum radix of 10
* (decimal) and a maximum of 4096 bit numbers (1234 decimal chars). * (decimal) and a maximum of 4096 bit numbers (1234 decimal chars).
* Autosized at compile time for at least a 10 char label, a minimum radix
* of 10 (decimal) for a number of POLARSSL_MPI_MAX_BITS size.
*
* This used to be statically sized to 1250 for a maximum of 4096 bit
* numbers (1234 decimal chars).
*
* Calculate using the formula:
* POLARSSL_MPI_RW_BUFFER_SIZE = ceil(POLARSSL_MPI_MAX_BITS / ln(10) * ln(2)) +
* LabelSize + 6
*/ */
#define POLARSSL_MPI_RW_BUFFER_SIZE 1250 #define POLARSSL_MPI_MAX_BITS_SCALE100 ( 100 * POLARSSL_MPI_MAX_BITS )
#define LN_2_DIV_LN_10_SCALE100 332
#define POLARSSL_MPI_RW_BUFFER_SIZE ( ((POLARSSL_MPI_MAX_BITS_SCALE100 + LN_2_DIV_LN_10_SCALE100 - 1) / LN_2_DIV_LN_10_SCALE100) + 10 + 6 )
/* /*
* Define the base integer type, architecture-wise * Define the base integer type, architecture-wise