NAME

       kcapi_kpp_setkey - set the private key of the DH / ECDH operation

SYNOPSIS

       int kcapi_kpp_setkey(struct kcapi_handle * handle, const uint8_t * key, uint32_t keylen);

ARGUMENTS

       handle
           [in] cipher handle

       key
           [in] key buffer

       keylen
           [in] length of key buffer

DESCRIPTION

       With this function, the caller sets the key for subsequent DH / ECDH public key generation
       or shared secret generation operations.

       If the key / keylen is zero, the kernel tries to generate the private key itself and
       retains it internally. This is useful if the DH / ECDH operation shall be performed on
       ephemeral keys where the caller is only interested in eventually obtain the shared secret.

       After the caller provided the key, the caller may securely destroy the key as it is now
       maintained by the kernel.

       Note, the key can only be set after the DH parameters or the ECC curve has been set.

       return in case of success a positive integer is returned that denominates the maximum
       output size of the cryptographic operation -- this value must be used as the size of the
       output buffer for one cryptographic operation); a negative errno-style error code if an
       error occurred -- the error -EOPNOTSUPP is returned in case a kernel-triggered private key
       generation is requested, but the underlying cipher implementation does not support this
       operation.

AUTHOR

       Stephan Mueller <smueller@chronox.de>
           Author.

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