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SourceVuSTM32 Libraries and SamplesmbedTLSMBEDTLS_CTR_DRBG_BLOCKSIZE

MBEDTLS_CTR_DRBG_BLOCKSIZE macro

The block size used by the cipher.

Syntax

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Summary

Declaration

from ctr_drbg.h:56

#define MBEDTLS_CTR_DRBG_BLOCKSIZE 16

References

Code

Location

#define MBEDTLS_CTR_DRBG_BLOCKSIZE 16 /**< The block size used by the cipher. */

unsigned char buf[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16];

unsigned char chain[MBEDTLS_CTR_DRBG_BLOCKSIZE];

memset( buf, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16 );

p = buf + MBEDTLS_CTR_DRBG_BLOCKSIZE;

buf_len = MBEDTLS_CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;

for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )

memset( chain, 0, MBEDTLS_CTR_DRBG_BLOCKSIZE );

for( i = 0; i < MBEDTLS_CTR_DRBG_BLOCKSIZE; i++ )

p += MBEDTLS_CTR_DRBG_BLOCKSIZE;

use_len -= ( use_len >= MBEDTLS_CTR_DRBG_BLOCKSIZE ) ?

MBEDTLS_CTR_DRBG_BLOCKSIZE : use_len;

memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE );

for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )

memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE );

p += MBEDTLS_CTR_DRBG_BLOCKSIZE;

for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )

for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )

p += MBEDTLS_CTR_DRBG_BLOCKSIZE;

memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, MBEDTLS_CTR_DRBG_BLOCKSIZE );

unsigned char tmp[MBEDTLS_CTR_DRBG_BLOCKSIZE];

for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )

use_len = ( output_len > MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? MBEDTLS_CTR_DRBG_BLOCKSIZE :

#define MBEDTLS_CTR_DRBG_SEEDLEN ( MBEDTLS_CTR_DRBG_KEYSIZE + MBEDTLS_CTR_DRBG_BLOCKSIZE ) /**< The seed length, calculated as (counter + AES key). */