New function mbedtls_rsa_get_bitlen
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.
diff --git a/library/pk_wrap.c b/library/pk_wrap.c
index 2c7d2d7..f9b4c65 100644
--- a/library/pk_wrap.c
+++ b/library/pk_wrap.c
@@ -66,7 +66,7 @@
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,