libssh2_packet_read() needing at least blocksize bytes (if encryption is active) is also incorrect. Suppose we use a mac of 20 bytes and a blocksize of 16 bytes and the packet arrives in two parts, the second part containing the last 2 bytes of the mac. Now, the first libssh2_packet_read() call processes all bytes of the packet except for the last 2. The second call will read the last 2 bytes of the packet and won't process them as it has read less than a block (2<16). This call and all subsequent calls of libssh2_packet_read() will return PACKET_EAGAIN.
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