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/rsa.c b/library/rsa.c
index 88c1cf1..ad19639 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -480,12 +480,19 @@
/*
* Get length in bytes of RSA modulus
*/
-
size_t mbedtls_rsa_get_len( const mbedtls_rsa_context *ctx )
{
return( ctx->len );
}
+/*
+ * Get length in bits of RSA modulus
+ */
+size_t mbedtls_rsa_get_bitlen( const mbedtls_rsa_context *ctx )
+{
+ return( mbedtls_mpi_bitlen( &ctx->N ) );
+}
+
#if defined(MBEDTLS_GENPRIME)