kernel crypto hmac sha256 API call code

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static int hmac_sha256(char *plaintext, unsigned int plain_text_size, char *key, unsigned int key_size, uint8_t *result){    struct scatterlist sg;    struct crypto_hash *tfm;    struct hash_desc desc;    int ret;    if (!result) {        printk(KERN_ERR "param err\n");         return -EINVAL;     }     tfm = crypto_alloc_hash("hmac(sha256)", 0, CRYPTO_ALG_ASYNC);    if (IS_ERR(tfm)) {         printk(KERN_ERR "crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));        return -EINVAL;      }      desc.tfm = tfm;     desc.flags = 0;      sg_set_buf(&sg, plaintext, plain_text_size);      ret = crypto_hash_setkey(tfm, key, key_size);      if (ret) {         printk(KERN_ERR "crypto_ahash_setkey failed: err %d", ret);          goto out;      }      ret = crypto_hash_digest(&desc, &sg, plain_text_size, result);     if(ret) {          printk(KERN_ERR "digest() failed ret = %d\n", ret);         goto out;      }      printk(KERN_DEBUG, "crypto hash digest size %d\n", crypto_hash_digestsize(tfm));out:     crypto_free_hash(tfm);     return -EINVAL;}

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