Source of authenc.c - linux-imx - PHYTEC BitBucket (Stash)

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int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key,
                   unsigned int keylen)
{
    struct rtattr *rta = (struct rtattr *)key;
    struct crypto_authenc_key_param *param;
​
    if (!RTA_OK(rta, keylen))
        return -EINVAL;
    if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
        return -EINVAL;
    if (RTA_PAYLOAD(rta) < sizeof(*param))
​
    /*
     * RTA_OK() didn't align the rtattr's payload when validating that it
     * fits in the buffer.  Yet, the keys should start on the next 4-byte
     * aligned boundary.  To avoid confusion, require that the rtattr
     * payload be exactly the param struct, which has a 4-byte aligned size.
     */
    if (RTA_PAYLOAD(rta) != sizeof(*param))
        return -EINVAL;
    BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO);
​
    param = RTA_DATA(rta);
    keys->enckeylen = be32_to_cpu(param->enckeylen);
​
    key += RTA_ALIGN(rta->rta_len);
    keylen -= RTA_ALIGN(rta->rta_len);
    key += rta->rta_len;
    keylen -= rta->rta_len;
​
    if (keylen < keys->enckeylen)
        return -EINVAL;
​
    keys->authkeylen = keylen - keys->enckeylen;
    keys->authkey = key;
    keys->enckey = key + keys->authkeylen;
​
    return 0;
}