Eric Lee / smarc-fsl-linux-kernel

03 Jun, 2016

1 commit

  • 4693fc734   KEYS: Add placeholder for KDF usage with DH ... Browse Code »

    The values computed during Diffie-Hellman key exchange are often used
    in combination with key derivation functions to create cryptographic
    keys. Add a placeholder for a later implementation to configure a
    key derivation function that will transform the Diffie-Hellman
    result returned by the KEYCTL_DH_COMPUTE command.

    [This patch was stripped down from a patch produced by Mat Martineau that
    had a bug in the compat code - so for the moment Stephan's patch simply
    requires that the placeholder argument must be NULL]

    Original-signed-off-by: Mat Martineau
    Signed-off-by: Stephan Mueller
    Signed-off-by: David Howells
    Signed-off-by: James Morris

    Stephan Mueller
     

13 Apr, 2016

1 commit

  • ddbb41148   KEYS: Add KEYCTL_DH_COMPUTE command ... Browse Code »

    This adds userspace access to Diffie-Hellman computations through a
    new keyctl() syscall command to calculate shared secrets or public
    keys using input parameters stored in the keyring.

    Input key ids are provided in a struct due to the current 5-arg limit
    for the keyctl syscall. Only user keys are supported in order to avoid
    exposing the content of logon or encrypted keys.

    The output is written to the provided buffer, based on the assumption
    that the values are only needed in userspace.

    Future support for other types of key derivation would involve a new
    command, like KEYCTL_ECDH_COMPUTE.

    Once Diffie-Hellman support is included in the crypto API, this code
    can be converted to use the crypto API to take advantage of possible
    hardware acceleration and reduce redundant code.

    Signed-off-by: Mat Martineau
    Signed-off-by: David Howells

    Mat Martineau