ppc_aes_gcm_crypt
#define AES_gcm_encrypt(i,o,l,k,v,x) ppc_aes_gcm_crypt(i,o,l,k,v,x,1)
#define AES_gcm_decrypt(i,o,l,k,v,x) ppc_aes_gcm_crypt(i,o,l,k,v,x,0)