md4_ctx_t
ctx->cc_provider_private = kmem_alloc(sizeof (md4_ctx_t),
kmem_free(ctx->cc_provider_private, sizeof (md4_ctx_t));
kmem_free(ctx->cc_provider_private, sizeof (md4_ctx_t));
kmem_free(ctx->cc_provider_private, sizeof (md4_ctx_t));
#define PROV_MD4_CTX(ctx) ((md4_ctx_t *)(ctx)->cc_provider_private)