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New function mbedtls_rsa_get_bitlen

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Add a new function mbedtls_rsa_get_bitlen which returns the RSA key
size, i.e. the bit size of the modulus. In the pk module, call
mbedtls_rsa_get_bitlen instead of mbedtls_rsa_get_len, which gave the
wrong result for key sizes that are not a multiple of 8.

This commit adds one non-regression test in the pk suite. More tests
are needed for RSA key sizes that are a multiple of 8.

This commit does not address RSA alternative implementations, which
only provide an interface that return the modulus size in bytes.
This commit is contained in:
Gilles Peskine 2018-01-28 18:13:03 +01:00 • committed by itayzafrir
parent 4a6aaa4c51
commit 1d26709dbd
6 changed files with 80 additions and 18 deletions
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2
library/pk_wrap.c
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@ -66,7 +66,7 @@ static int rsa_can_do( mbedtls_pk_type_t type )
static size_t rsa_get_bitlen( const void *ctx )
{
const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;
return( 8 * mbedtls_rsa_get_len( rsa ) );
return( mbedtls_rsa_get_bitlen( rsa ) );
}
static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,