linux kernelcrypto api学习教程

struct blkcipher_walk {
    union {
        struct {
            struct page *page;
            unsigned long offset;
        } phys;

        struct {
            u8 *page;
            u8 *addr;
        } virt;
    } src, dst;

    struct scatter_walk in;
    unsigned int nbytes;

    struct scatter_walk out;
    unsigned int total;

    void *page;
    u8 *buffer;
    u8 *iv;
    unsigned int ivsize;

    int flags;
    unsigned int walk_blocksize;
    unsigned int cipher_blocksize;
    unsigned int alignmask;
};

struct scatter_walk {
    struct scatterlist *sg;
    unsigned int offset;
};

static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
                       struct scatterlist *dst,
                       struct scatterlist *src,
                       unsigned int nbytes)
{
    walk->in.sg = src;
    walk->out.sg = dst;
    walk->total = nbytes;
}