Make exceptions easier to translate to error codes

Avoid throwing base Botan::Exception type, as it is difficult to
determine what the error is in that case.

Add Exception::error_code and Exception::error_type which allows
(for error code) more information about the error and (for error type)
allows knowing the error type without requiring a sequence of catches.

See GH #1742

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/pubkey/blinding.cpp b/src/lib/pubkey/blinding.cpp
index ecd420780..d1f299229 100644
--- a/src/lib/pubkey/blinding.cpp
+++ b/src/lib/pubkey/blinding.cpp
@@ -35,7 +35,7 @@ BigInt Blinder::blinding_nonce() const
 BigInt Blinder::blind(const BigInt& i) const
    {
    if(!m_reducer.initialized())
-      throw Exception("Blinder not initialized, cannot blind");
+      throw Invalid_State("Blinder not initialized, cannot blind");
 
    ++m_counter;
 
@@ -58,7 +58,7 @@ BigInt Blinder::blind(const BigInt& i) const
 BigInt Blinder::unblind(const BigInt& i) const
    {
    if(!m_reducer.initialized())
-      throw Exception("Blinder not initialized, cannot unblind");
+      throw Invalid_State("Blinder not initialized, cannot unblind");
 
    return m_reducer.multiply(i, m_d);
    }