1. 25 Feb, 2015 1 commit
  2. 16 Oct, 2014 1 commit
    • Ruchika Gupta's avatar
      crypto/fsl: Add command for encapsulating/decapsulating blobs · c5de15cb
      Ruchika Gupta authored
      Freescale's SEC block has built-in Blob Protocol which provides
      a method for protecting user-defined data across system power
      cycles. SEC block protects data in a data structure called a Blob,
      which provides both confidentiality and integrity protection.
      
      Encapsulating data as a blob
      Each time that the Blob Protocol is used to protect data, a
      different randomly generated key is used to encrypt the data.
      This random key is itself encrypted using a key which is derived
      from SoC's non volatile secret key and a 16 bit Key identifier.
      The resulting encrypted key along with encrypted data is called a blob.
      The non volatile secure key is available for use only during secure boot.
      
      During decapsulation, the reverse process is performed to get back
      the original data.
      
      Commands added
      --------------
          blob enc - encapsulating data as a cryptgraphic blob
          blob dec - decapsulating cryptgraphic blob to get the data
      
      Commands Syntax
      ---------------
      	blob enc src dst len km
      
      	Encapsulate and create blob of data $len bytes long
      	at address $src and store the result at address $dst.
      	$km is the 16 byte key modifier is also required for
      	generation/use as key for cryptographic operation. Key
      	modifier should be 16 byte long.
      
      	blob dec src dst len km
      
      	Decapsulate the  blob of data at address $src and
      	store result of $len byte at addr $dst.
      	$km is the 16 byte key modifier is also required for
      	generation/use as key for cryptographic operation. Key
      	modifier should be 16 byte long.
      Signed-off-by: default avatarRuchika Gupta <ruchika.gupta@freescale.com>
      Reviewed-by: default avatarYork Sun <yorksun@freescale.com>
      c5de15cb