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Differential D4699 Diff 11831 sys/geom/eli/g_eli_hmac.c

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sys/geom/eli/g_eli_hmac.c

  • This file was copied from sys/geom/eli/g_eli_crypto.c.
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#include <strings.h> #include <strings.h>
#include <errno.h> #include <errno.h>
#include <assert.h> #include <assert.h>
#include <openssl/evp.h> #include <openssl/evp.h>
#define _OpenSSL_ #define _OpenSSL_
#endif #endif
#include <geom/eli/g_eli.h> #include <geom/eli/g_eli.h>
#ifdef _KERNEL
MALLOC_DECLARE(M_ELI);
static int
g_eli_crypto_done(struct cryptop *crp)
{
crp->crp_opaque = (void *)crp;
wakeup(crp);
return (0);
}
static int
g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
struct cryptoini cri;
struct cryptop *crp;
struct cryptodesc *crd;
uint64_t sid;
u_char *p;
int error;
KASSERT(algo != CRYPTO_AES_XTS,
("%s: CRYPTO_AES_XTS unexpected here", __func__));
bzero(&cri, sizeof(cri));
cri.cri_alg = algo;
cri.cri_key = __DECONST(void *, key);
cri.cri_klen = keysize;
error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE);
if (error != 0)
return (error);
p = malloc(sizeof(*crp) + sizeof(*crd), M_ELI, M_NOWAIT | M_ZERO);
if (p == NULL) {
crypto_freesession(sid);
return (ENOMEM);
}
crp = (struct cryptop *)p; p += sizeof(*crp);
crd = (struct cryptodesc *)p; p += sizeof(*crd);
crd->crd_skip = 0;
crd->crd_len = datasize;
crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
if (enc)
crd->crd_flags |= CRD_F_ENCRYPT;
crd->crd_alg = algo;
crd->crd_key = __DECONST(void *, key);
crd->crd_klen = keysize;
bzero(crd->crd_iv, sizeof(crd->crd_iv));
crd->crd_next = NULL;
crp->crp_sid = sid;
crp->crp_ilen = datasize;
crp->crp_olen = datasize;
crp->crp_opaque = NULL;
crp->crp_callback = g_eli_crypto_done;
crp->crp_buf = (void *)data;
crp->crp_flags = CRYPTO_F_CBIFSYNC;
crp->crp_desc = crd;
error = crypto_dispatch(crp);
if (error == 0) {
while (crp->crp_opaque == NULL)
tsleep(crp, PRIBIO, "geli", hz / 5);
error = crp->crp_etype;
}
free(crp, M_ELI);
crypto_freesession(sid);
return (error);
}
#else /* !_KERNEL */
static int
g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
EVP_CIPHER_CTX ctx;
const EVP_CIPHER *type;
u_char iv[keysize];
int outsize;
assert(algo != CRYPTO_AES_XTS);
switch (algo) {
case CRYPTO_NULL_CBC:
type = EVP_enc_null();
break;
case CRYPTO_AES_CBC:
switch (keysize) {
case 128:
type = EVP_aes_128_cbc();
break;
case 192:
type = EVP_aes_192_cbc();
break;
case 256:
type = EVP_aes_256_cbc();
break;
default:
return (EINVAL);
}
break;
case CRYPTO_BLF_CBC:
type = EVP_bf_cbc();
break;
#ifndef OPENSSL_NO_CAMELLIA
case CRYPTO_CAMELLIA_CBC:
switch (keysize) {
case 128:
type = EVP_camellia_128_cbc();
break;
case 192:
type = EVP_camellia_192_cbc();
break;
case 256:
type = EVP_camellia_256_cbc();
break;
default:
return (EINVAL);
}
break;
#endif
case CRYPTO_3DES_CBC:
type = EVP_des_ede3_cbc();
break;
default:
return (EINVAL);
}
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc);
EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8);
EVP_CIPHER_CTX_set_padding(&ctx, 0);
bzero(iv, sizeof(iv));
EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc);
if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) {
EVP_CIPHER_CTX_cleanup(&ctx);
return (EINVAL);
}
assert(outsize == (int)datasize);
if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) {
EVP_CIPHER_CTX_cleanup(&ctx);
return (EINVAL);
}
assert(outsize == 0);
EVP_CIPHER_CTX_cleanup(&ctx);
return (0);
}
#endif /* !_KERNEL */
int
g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
/* We prefer AES-CBC for metadata protection. */
if (algo == CRYPTO_AES_XTS)
algo = CRYPTO_AES_CBC;
return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
}
int
g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
/* We prefer AES-CBC for metadata protection. */
if (algo == CRYPTO_AES_XTS)
algo = CRYPTO_AES_CBC;
return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
}
void void
g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey, g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
size_t hkeylen) size_t hkeylen)
{ {
u_char k_ipad[128], key[128]; u_char k_ipad[128], key[128];
SHA512_CTX lctx; SHA512_CTX lctx;
u_int i; u_int i;
▲ Show 20 Lines • Show All 54 Lines • ▼ Show 20 Lines
g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data, g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data,
size_t datasize, uint8_t *md, size_t mdsize) size_t datasize, uint8_t *md, size_t mdsize)
{ {
struct hmac_ctx ctx; struct hmac_ctx ctx;
g_eli_crypto_hmac_init(&ctx, hkey, hkeysize); g_eli_crypto_hmac_init(&ctx, hkey, hkeysize);
g_eli_crypto_hmac_update(&ctx, data, datasize); g_eli_crypto_hmac_update(&ctx, data, datasize);
g_eli_crypto_hmac_final(&ctx, md, mdsize); g_eli_crypto_hmac_final(&ctx, md, mdsize);
}
/*
* Here we generate IV. It is unique for every sector.
*/
void
g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv,
size_t size)
{
uint8_t off[8];
if ((sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER) != 0)
bcopy(&offset, off, sizeof(off));
else
le64enc(off, (uint64_t)offset);
switch (sc->sc_ealgo) {
case CRYPTO_AES_XTS:
bcopy(off, iv, sizeof(off));
bzero(iv + sizeof(off), size - sizeof(off));
break;
default:
{
u_char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX ctx;
/* Copy precalculated SHA256 context for IV-Key. */
bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx));
SHA256_Update(&ctx, off, sizeof(off));
SHA256_Final(hash, &ctx);
bcopy(hash, iv, MIN(sizeof(hash), size));
break;
}
}
} }