The Le parameter in the AUTHENTICATE command was not being set for GSM authentication. This did work, but explicitly setting it to 0 as UMTS does was more consitent. --- src/simutil.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/simutil.c b/src/simutil.c index 2f49500..c25b3a8 100644 --- a/src/simutil.c +++ b/src/simutil.c @@ -1628,9 +1628,10 @@ static int build_authenticate(unsigned char *buffer, const unsigned char *rand, buffer[pos++] = 0x10; memcpy(buffer + pos, autn, 16); pos += 16; - buffer[pos++] = 0x00; } + buffer[pos++] = 0x00; + return pos; } -- 2.7.4