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crypto: make PBKDF iterations configurable for LUKS format

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As protection against bruteforcing passphrases, the PBKDF
algorithm is tuned by counting the number of iterations
needed to produce 1 second of running time. If the machine
that the image will be used on is much faster than the
machine where the image is created, it can be desirable
to raise the number of iterations. This change adds a new
'iter-time' property that allows the user to choose the
iteration wallclock time.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-09-06 18:43:00 +01:00
parent 59b060be18
commit 3bd18890ca
3 changed files with 35 additions and 1 deletions
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6
block/crypto.c
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@ -33,6 +33,7 @@
#define BLOCK_CRYPTO_OPT_LUKS_IVGEN_ALG "ivgen-alg"
#define BLOCK_CRYPTO_OPT_LUKS_IVGEN_HASH_ALG "ivgen-hash-alg"
#define BLOCK_CRYPTO_OPT_LUKS_HASH_ALG "hash-alg"
#define BLOCK_CRYPTO_OPT_LUKS_ITER_TIME "iter-time"
typedef struct BlockCrypto BlockCrypto;
@ -183,6 +184,11 @@ static QemuOptsList block_crypto_create_opts_luks = {
.type = QEMU_OPT_STRING,
.help = "Name of encryption hash algorithm",
},
{
.name = BLOCK_CRYPTO_OPT_LUKS_ITER_TIME,
.type = QEMU_OPT_NUMBER,
.help = "Time to spend in PBKDF in milliseconds",
},
{ /* end of list */ }
},
};