Well according to this article http://www.reuters.com/article/idUS137952+28-Jun-2011+BW20110628
Ralink Selects AuthenTec SafeXcel Packet Engine to Enhance Security of Newest RT Series Communications ICs
"The SafeXcel EIP-93 packet engine is a comprehensive security accelerator, providing balance between gate count, performance and available algorithms. It helps accelerate the protocol functionality for Internet Protocol Security (IPsec), Secure Sockets Layer (SSL), Transport Layer Security (TLS), Datagram TLS (DTLS), and Secure Realtime Transport Protocol (SRTP). The engine supports a wide variety of today’s most important crypto algorithms, including DES, 3DES, AES 128/192/256, SHA1, SHA-224/256, AES-CCM, ARC4 and MD5."
So the MT7621 crypto engine DO support AES...probably you are telling us that it does not provide any dev/crypto interface to access the engine from user applications like OpenSSL ?