Flaky test in crypto package: TestElg

[hkparker]

Every so often the TestElg test fails

$ go test ./... -cover
?       github.com/hkparker/go-i2p  [no test files]
ok      github.com/hkparker/go-i2p/lib/common   0.007s  coverage: 80.1% of statements
?       github.com/hkparker/go-i2p/lib/common/base32    [no test files]
?       github.com/hkparker/go-i2p/lib/common/base64    [no test files]
?       github.com/hkparker/go-i2p/lib/config   [no test files]
--- FAIL: TestElg (0.01s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
    panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x8 pc=0x7f1d7c002185]

goroutine 7 [running]:
panic(0x7f1d7c112ca0, 0xc82000a180)
    /usr/lib/go/src/runtime/panic.go:481 +0x3e6
testing.tRunner.func1(0xc8200226c0)
    /usr/lib/go/src/testing/testing.go:467 +0x192
panic(0x7f1d7c112ca0, 0xc82000a180)
    /usr/lib/go/src/runtime/panic.go:443 +0x4e9
github.com/hkparker/go-i2p/lib/crypto.createElgamalEncryption(0x0, 0x7f1d7c3794f0, 0xc820016720, 0x0, 0x0, 0x0)
    github.com/hkparker/go-i2p/lib/crypto/_test/_obj_test/elg.go:198 +0x175
github.com/hkparker/go-i2p/lib/crypto.TestElg(0xc8200226c0)
    /home/hayden/Development/Go/src/github.com/hkparker/go-i2p/lib/crypto/elg_test.go:19 +0x197
testing.tRunner(0xc8200226c0, 0x7f1d7c420770)
    /usr/lib/go/src/testing/testing.go:473 +0x98
created by testing.RunTests
    /usr/lib/go/src/testing/testing.go:582 +0x892
FAIL    github.com/hkparker/go-i2p/lib/crypto   0.018s
?       github.com/hkparker/go-i2p/lib/i2np [no test files]
?       github.com/hkparker/go-i2p/lib/netdb    [no test files]
?       github.com/hkparker/go-i2p/lib/router   [no test files]
?       github.com/hkparker/go-i2p/lib/transport    [no test files]
?       github.com/hkparker/go-i2p/lib/transport/ssu    [no test files]
?       github.com/hkparker/go-i2p/lib/tunnel   [no test files]