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e52e6f66ac
JWS functions are supposed to return 0 upon error or when nothing was produced. This was done in order to put easily the return value in trash->data without having to check the return value. However functions like a2base64url() or snprintf() could return a negative value, which would be casted in a unsigned int if this happen. This patch add checks on the JWS functions to ensure that no negative value can be returned, and change the prototype from int to size_t. This is also related to issue #3114. Must be backported to 3.2.