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When encrypting/decrypting data, the plaintext/ciphertext
buffers are required to be a multiple of the cipher block
size. If this is not done, nettle will abort and gcrypt
will report an error. To get consistent behaviour add
explicit checks upfront for the buffer sizes.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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Commit d3462e3 broke qcow2's encryption functionality by using encrypt
instead of decrypt in the wrapper function it introduces. This was found
by qemu-iotests case 134.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
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Calling a function pointer that was cast from an incompatible function
results in undefined behavior. 'void *' isn't compatible with 'struct
XXX *', so we can't cast to nettle_cipher_func, but have to provide a
wrapper. (Conversion from 'void *' to 'struct XXX *' might require
computation, which won't be done if we drop argument's true type, and
pointers can have different sizes so passing arguments on stack would
bug.)
Having two different prototypes based on nettle version doesn't make
this solution any nicer.
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Message-Id: <1437062641-12684-3-git-send-email-rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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In nettle 3, cbc_encrypt() accepts 'nettle_cipher_func' instead of
'nettle_crypt_func' and these two differ in 'const' qualifier of the
first argument. The build fails with:
In file included from crypto/cipher.c:71:0:
./crypto/cipher-nettle.c: In function ‘qcrypto_cipher_encrypt’:
./crypto/cipher-nettle.c:154:38: error: passing argument 2 of
‘nettle_cbc_encrypt’ from incompatible pointer type
cbc_encrypt(ctx->ctx_encrypt, ctx->alg_encrypt,
^
In file included from ./crypto/cipher-nettle.c:24:0,
from crypto/cipher.c:71:
/usr/include/nettle/cbc.h:48:1: note: expected
‘void (*)(const void *, size_t, uint8_t *, const uint8_t *)
but argument is of type
‘void (*)( void *, size_t, uint8_t *, const uint8_t *)
To allow both versions, we switch to the new definition and #if typedef
it for old versions.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Message-Id: <1436548682-9315-2-git-send-email-rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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If we are linking to gnutls already and gnutls is built against
nettle, then we should use nettle as a cipher backend in
preference to our built-in backend.
This will be used when linking against some GNUTLS 2.x versions
and all GNUTLS 3.x versions.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1435770638-25715-7-git-send-email-berrange@redhat.com>
[Change "#elif" to "#elif defined". - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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