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| author | Daniel P. Berrangé <berrange@redhat.com> | 2021-06-29 14:25:32 +0100 |
|---|---|---|
| committer | Daniel P. Berrangé <berrange@redhat.com> | 2021-07-14 14:15:52 +0100 |
| commit | 83bee4b51fad383c1ee9b9f58fefb90fddae1c00 (patch) | |
| tree | 3418b2fffe3aa484830c0397619f4cedbc291a73 /crypto/cipher.c | |
| parent | 6801404429d51b260e08c6ad54dbf3ac430016db (diff) | |
| download | focaccia-qemu-83bee4b51fad383c1ee9b9f58fefb90fddae1c00.tar.gz focaccia-qemu-83bee4b51fad383c1ee9b9f58fefb90fddae1c00.zip | |
crypto: replace 'des-rfb' cipher with 'des'
Currently the crypto layer exposes support for a 'des-rfb' algorithm which is just normal single-DES, with the bits in each key byte reversed. This special key munging is required by the RFB protocol password authentication mechanism. Since the crypto layer is generic shared code, it makes more sense to do the key byte munging in the VNC server code, and expose normal single-DES support. Replacing cipher 'des-rfb' by 'des' looks like an incompatible interface change, but it doesn't matter. While the QMP schema allows any QCryptoCipherAlgorithm for the 'cipher-alg' field in QCryptoBlockCreateOptionsLUKS, the code restricts what can be used at runtime. Thus the only effect is a change in error message. Original behaviour: $ qemu-img create -f luks --object secret,id=sec0,data=123 -o cipher-alg=des-rfb,key-secret=sec0 demo.luks 1G Formatting 'demo.luks', fmt=luks size=1073741824 key-secret=sec0 cipher-alg=des-rfb qemu-img: demo.luks: Algorithm 'des-rfb' not supported New behaviour: $ qemu-img create -f luks --object secret,id=sec0,data=123 -o cipher-alg=des-rfb,key-secret=sec0 demo.luks 1G Formatting 'demo.luks', fmt=luks size=1073741824 key-secret=sec0 cipher-alg=des-fish qemu-img: demo.luks: Invalid parameter 'des-rfb' Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Diffstat (limited to 'crypto/cipher.c')
| -rw-r--r-- | crypto/cipher.c | 28 |
1 files changed, 5 insertions, 23 deletions
diff --git a/crypto/cipher.c b/crypto/cipher.c index 068b2fb867..1f5528be49 100644 --- a/crypto/cipher.c +++ b/crypto/cipher.c @@ -29,7 +29,7 @@ static const size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = { [QCRYPTO_CIPHER_ALG_AES_128] = 16, [QCRYPTO_CIPHER_ALG_AES_192] = 24, [QCRYPTO_CIPHER_ALG_AES_256] = 32, - [QCRYPTO_CIPHER_ALG_DES_RFB] = 8, + [QCRYPTO_CIPHER_ALG_DES] = 8, [QCRYPTO_CIPHER_ALG_3DES] = 24, [QCRYPTO_CIPHER_ALG_CAST5_128] = 16, [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16, @@ -44,7 +44,7 @@ static const size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = { [QCRYPTO_CIPHER_ALG_AES_128] = 16, [QCRYPTO_CIPHER_ALG_AES_192] = 16, [QCRYPTO_CIPHER_ALG_AES_256] = 16, - [QCRYPTO_CIPHER_ALG_DES_RFB] = 8, + [QCRYPTO_CIPHER_ALG_DES] = 8, [QCRYPTO_CIPHER_ALG_3DES] = 8, [QCRYPTO_CIPHER_ALG_CAST5_128] = 8, [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16, @@ -107,9 +107,9 @@ qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg, } if (mode == QCRYPTO_CIPHER_MODE_XTS) { - if (alg == QCRYPTO_CIPHER_ALG_DES_RFB - || alg == QCRYPTO_CIPHER_ALG_3DES) { - error_setg(errp, "XTS mode not compatible with DES-RFB/3DES"); + if (alg == QCRYPTO_CIPHER_ALG_DES || + alg == QCRYPTO_CIPHER_ALG_3DES) { + error_setg(errp, "XTS mode not compatible with DES/3DES"); return false; } if (nkey % 2) { @@ -132,24 +132,6 @@ qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg, return true; } -#if defined(CONFIG_GCRYPT) || defined(CONFIG_NETTLE) -static uint8_t * -qcrypto_cipher_munge_des_rfb_key(const uint8_t *key, - size_t nkey) -{ - uint8_t *ret = g_new0(uint8_t, nkey); - size_t i; - for (i = 0; i < nkey; i++) { - uint8_t r = key[i]; - r = (r & 0xf0) >> 4 | (r & 0x0f) << 4; - r = (r & 0xcc) >> 2 | (r & 0x33) << 2; - r = (r & 0xaa) >> 1 | (r & 0x55) << 1; - ret[i] = r; - } - return ret; -} -#endif /* CONFIG_GCRYPT || CONFIG_NETTLE */ - #ifdef CONFIG_GCRYPT #include "cipher-gcrypt.c.inc" #elif defined CONFIG_NETTLE |