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Add output size parameter to signature functions

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The functions mbedtls_pk_sign(), mbedtls_pk_sign_restartable(),
mbedtls_ecdsa_write_signature() and mbedtls_ecdsa_write_signature_restartable()
now take an extra parameter indicating the size of the output buffer for the
signature.

No change to RSA because for RSA, the output size is trivial to calculate.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-22 00:09:00 +02:00
parent 1fed4b8324
commit f00f152444
19 changed files with 131 additions and 81 deletions
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4
programs/test/benchmark.c
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@@ -1088,7 +1088,7 @@ int main( int argc, char *argv[] )
curve_info->name );
TIME_PUBLIC( title, "sign",
ret = mbedtls_ecdsa_write_signature( &ecdsa, MBEDTLS_MD_SHA256, buf, curve_info->bit_size,
tmp, &sig_len, myrand, NULL ) );
tmp, sizeof( tmp ), &sig_len, myrand, NULL ) );
mbedtls_ecdsa_free( &ecdsa );
}
@@ -1104,7 +1104,7 @@ int main( int argc, char *argv[] )
if( mbedtls_ecdsa_genkey( &ecdsa, curve_info->grp_id, myrand, NULL ) != 0 ||
mbedtls_ecdsa_write_signature( &ecdsa, MBEDTLS_MD_SHA256, buf, curve_info->bit_size,
tmp, &sig_len, myrand, NULL ) != 0 )
tmp, sizeof( tmp ), &sig_len, myrand, NULL ) != 0 )
{
mbedtls_exit( 1 );
}