1. 28 Nov, 2010 1 commit
    • Mimi Zohar's avatar
      keys: add new key-type encrypted · 7e70cb49
      Mimi Zohar authored
      
      
      Define a new kernel key-type called 'encrypted'. Encrypted keys are kernel
      generated random numbers, which are encrypted/decrypted with a 'trusted'
      symmetric key. Encrypted keys are created/encrypted/decrypted in the kernel.
      Userspace only ever sees/stores encrypted blobs.
      
      Changelog:
      - bug fix: replaced master-key rcu based locking with semaphore
        (reported by David Howells)
      - Removed memset of crypto_shash_digest() digest output
      - Replaced verification of 'key-type:key-desc' using strcspn(), with
        one based on string constants.
      - Moved documentation to Documentation/keys-trusted-encrypted.txt
      - Replace hash with shash (based on comments by David Howells)
      - Make lengths/counts size_t where possible (based on comments by David Howells)
        Could not convert most lengths, as crypto expects 'unsigned int'
        (size_t: on 32 bit is defined as unsigned int, but on 64 bit is unsigned long)
      - Add 'const' where possible (based on comments by David Howells)
      - allocate derived_buf dynamically to support arbitrary length master key
        (fixed by Roberto Sassu)
      - wait until late_initcall for crypto libraries to be registered
      - cleanup security/Kconfig
      - Add missing 'update' keyword (reported/fixed by Roberto Sassu)
      - Free epayload on failure to create key (reported/fixed by Roberto Sassu)
      - Increase the data size limit (requested by Roberto Sassu)
      - Crypto return codes are always 0 on success and negative on failure,
        remove unnecessary tests.
      - Replaced kzalloc() with kmalloc()
      Signed-off-by: default avatarMimi Zohar <zohar@us.ibm.com>
      Signed-off-by: default avatarDavid Safford <safford@watson.ibm.com>
      Reviewed-by: default avatarRoberto Sassu <roberto.sassu@polito.it>
      Signed-off-by: default avatarJames Morris <jmorris@namei.org>
      7e70cb49