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-rw-r--r--envelope.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/envelope.cpp b/envelope.cpp
index abf6e8f..0c995bd 100644
--- a/envelope.cpp
+++ b/envelope.cpp
@@ -59,6 +59,7 @@ namespace Envelope{
string decrypt(const string &data,const RSA::Key &privkey){
if(data.size()<2)throw invalid_argument("Envelope data length invalid");
+ //This double cast is necessary because of sign extension.
int encrkeylen=((uint16_t)(uint8_t)data[data.size()-2]<<8)+(uint8_t)data.back();
assert(encrkeylen<(1<<16));
if((int)data.size()<encrkeylen+2)throw invalid_argument("Envelope key format invalid");