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SUNRPC: Add RFC 8009 encryption KUnit tests
RFC 8009 provides sample encryption results. Add KUnit tests to ensure our implementation derives the expected results for the provided sample input. I hate how large this test is, but using non-standard key usage values means rfc8009_encrypt_case() can't simply reuse ->import_ctx to allocate and key its ciphers; and the test provides its own confounders, which means krb5_etm_encrypt() can't be used directly. Tested-by: Scott Mayhew <[email protected]> Reviewed-by: Simo Sorce <[email protected]> Signed-off-by: Chuck Lever <[email protected]>
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‎net/sunrpc/auth_gss/gss_krb5_crypto.c

Lines changed: 22 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -886,10 +886,27 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, u32 len,
886886
return ret;
887887
}
888888

889-
static u32
890-
krb5_etm_checksum(struct crypto_sync_skcipher *cipher,
891-
struct crypto_ahash *tfm, const struct xdr_buf *body,
892-
int body_offset, struct xdr_netobj *cksumout)
889+
/**
890+
* krb5_etm_checksum - Compute a MAC for a GSS Wrap token
891+
* @cipher: an initialized cipher transform
892+
* @tfm: an initialized hash transform
893+
* @body: xdr_buf containing an RPC message (body.len is the message length)
894+
* @body_offset: byte offset into @body to start checksumming
895+
* @cksumout: OUT: a buffer to be filled in with the computed HMAC
896+
*
897+
* Usually expressed as H = HMAC(K, IV | ciphertext)[1..h] .
898+
*
899+
* Caller provides the truncation length of the output token (h) in
900+
* cksumout.len.
901+
*
902+
* Return values:
903+
* %GSS_S_COMPLETE: Digest computed, @cksumout filled in
904+
* %GSS_S_FAILURE: Call failed
905+
*/
906+
VISIBLE_IF_KUNIT
907+
u32 krb5_etm_checksum(struct crypto_sync_skcipher *cipher,
908+
struct crypto_ahash *tfm, const struct xdr_buf *body,
909+
int body_offset, struct xdr_netobj *cksumout)
893910
{
894911
unsigned int ivsize = crypto_sync_skcipher_ivsize(cipher);
895912
struct ahash_request *req;
@@ -936,6 +953,7 @@ krb5_etm_checksum(struct crypto_sync_skcipher *cipher,
936953
kfree_sensitive(checksumdata);
937954
return err ? GSS_S_FAILURE : GSS_S_COMPLETE;
938955
}
956+
EXPORT_SYMBOL_IF_KUNIT(krb5_etm_checksum);
939957

940958
/**
941959
* krb5_etm_encrypt - Encrypt using the RFC 8009 rules

‎net/sunrpc/auth_gss/gss_krb5_internal.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -221,6 +221,9 @@ int krb5_cbc_cts_encrypt(struct crypto_sync_skcipher *cts_tfm,
221221
struct crypto_sync_skcipher *cbc_tfm, u32 offset,
222222
struct xdr_buf *buf, struct page **pages,
223223
u8 *iv, unsigned int ivsize);
224+
u32 krb5_etm_checksum(struct crypto_sync_skcipher *cipher,
225+
struct crypto_ahash *tfm, const struct xdr_buf *body,
226+
int body_offset, struct xdr_netobj *cksumout);
224227
#endif
225228

226229
#endif /* _NET_SUNRPC_AUTH_GSS_KRB5_INTERNAL_H */

‎net/sunrpc/auth_gss/gss_krb5_test.c

Lines changed: 329 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -30,6 +30,7 @@ struct gss_krb5_test_param {
3030
const struct xdr_netobj *plaintext;
3131
const struct xdr_netobj *confounder;
3232
const struct xdr_netobj *expected_result;
33+
const struct xdr_netobj *expected_hmac;
3334
const struct xdr_netobj *next_iv;
3435
};
3536

@@ -1562,6 +1563,329 @@ static const struct gss_krb5_test_param rfc8009_checksum_test_params[] = {
15621563
KUNIT_ARRAY_PARAM(rfc8009_checksum, rfc8009_checksum_test_params,
15631564
gss_krb5_get_desc);
15641565

1566+
/*
1567+
* From RFC 8009 Appendix A. Test Vectors
1568+
*
1569+
* Sample encryptions (all using the default cipher state):
1570+
* --------------------------------------------------------
1571+
*
1572+
* These sample encryptions use the above sample key derivation results,
1573+
* including use of the same base-key and key usage values.
1574+
*
1575+
* This test material is copyright (c) 2016 IETF Trust and the
1576+
* persons identified as the document authors. All rights reserved.
1577+
*/
1578+
1579+
static const struct xdr_netobj rfc8009_enc_empty_plaintext = {
1580+
.len = 0,
1581+
};
1582+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_short_plaintext,
1583+
0x00, 0x01, 0x02, 0x03, 0x04, 0x05
1584+
);
1585+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_block_plaintext,
1586+
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
1587+
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
1588+
);
1589+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_long_plaintext,
1590+
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
1591+
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
1592+
0x10, 0x11, 0x12, 0x13, 0x14
1593+
);
1594+
1595+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test1_confounder,
1596+
0x7e, 0x58, 0x95, 0xea, 0xf2, 0x67, 0x24, 0x35,
1597+
0xba, 0xd8, 0x17, 0xf5, 0x45, 0xa3, 0x71, 0x48
1598+
);
1599+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test1_expected_result,
1600+
0xef, 0x85, 0xfb, 0x89, 0x0b, 0xb8, 0x47, 0x2f,
1601+
0x4d, 0xab, 0x20, 0x39, 0x4d, 0xca, 0x78, 0x1d
1602+
);
1603+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test1_expected_hmac,
1604+
0xad, 0x87, 0x7e, 0xda, 0x39, 0xd5, 0x0c, 0x87,
1605+
0x0c, 0x0d, 0x5a, 0x0a, 0x8e, 0x48, 0xc7, 0x18
1606+
);
1607+
1608+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test2_confounder,
1609+
0x7b, 0xca, 0x28, 0x5e, 0x2f, 0xd4, 0x13, 0x0f,
1610+
0xb5, 0x5b, 0x1a, 0x5c, 0x83, 0xbc, 0x5b, 0x24
1611+
);
1612+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test2_expected_result,
1613+
0x84, 0xd7, 0xf3, 0x07, 0x54, 0xed, 0x98, 0x7b,
1614+
0xab, 0x0b, 0xf3, 0x50, 0x6b, 0xeb, 0x09, 0xcf,
1615+
0xb5, 0x54, 0x02, 0xce, 0xf7, 0xe6
1616+
);
1617+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test2_expected_hmac,
1618+
0x87, 0x7c, 0xe9, 0x9e, 0x24, 0x7e, 0x52, 0xd1,
1619+
0x6e, 0xd4, 0x42, 0x1d, 0xfd, 0xf8, 0x97, 0x6c
1620+
);
1621+
1622+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test3_confounder,
1623+
0x56, 0xab, 0x21, 0x71, 0x3f, 0xf6, 0x2c, 0x0a,
1624+
0x14, 0x57, 0x20, 0x0f, 0x6f, 0xa9, 0x94, 0x8f
1625+
);
1626+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test3_expected_result,
1627+
0x35, 0x17, 0xd6, 0x40, 0xf5, 0x0d, 0xdc, 0x8a,
1628+
0xd3, 0x62, 0x87, 0x22, 0xb3, 0x56, 0x9d, 0x2a,
1629+
0xe0, 0x74, 0x93, 0xfa, 0x82, 0x63, 0x25, 0x40,
1630+
0x80, 0xea, 0x65, 0xc1, 0x00, 0x8e, 0x8f, 0xc2
1631+
);
1632+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test3_expected_hmac,
1633+
0x95, 0xfb, 0x48, 0x52, 0xe7, 0xd8, 0x3e, 0x1e,
1634+
0x7c, 0x48, 0xc3, 0x7e, 0xeb, 0xe6, 0xb0, 0xd3
1635+
);
1636+
1637+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test4_confounder,
1638+
0xa7, 0xa4, 0xe2, 0x9a, 0x47, 0x28, 0xce, 0x10,
1639+
0x66, 0x4f, 0xb6, 0x4e, 0x49, 0xad, 0x3f, 0xac
1640+
);
1641+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test4_expected_result,
1642+
0x72, 0x0f, 0x73, 0xb1, 0x8d, 0x98, 0x59, 0xcd,
1643+
0x6c, 0xcb, 0x43, 0x46, 0x11, 0x5c, 0xd3, 0x36,
1644+
0xc7, 0x0f, 0x58, 0xed, 0xc0, 0xc4, 0x43, 0x7c,
1645+
0x55, 0x73, 0x54, 0x4c, 0x31, 0xc8, 0x13, 0xbc,
1646+
0xe1, 0xe6, 0xd0, 0x72, 0xc1
1647+
);
1648+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test4_expected_hmac,
1649+
0x86, 0xb3, 0x9a, 0x41, 0x3c, 0x2f, 0x92, 0xca,
1650+
0x9b, 0x83, 0x34, 0xa2, 0x87, 0xff, 0xcb, 0xfc
1651+
);
1652+
1653+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test5_confounder,
1654+
0xf7, 0x64, 0xe9, 0xfa, 0x15, 0xc2, 0x76, 0x47,
1655+
0x8b, 0x2c, 0x7d, 0x0c, 0x4e, 0x5f, 0x58, 0xe4
1656+
);
1657+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test5_expected_result,
1658+
0x41, 0xf5, 0x3f, 0xa5, 0xbf, 0xe7, 0x02, 0x6d,
1659+
0x91, 0xfa, 0xf9, 0xbe, 0x95, 0x91, 0x95, 0xa0
1660+
);
1661+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test5_expected_hmac,
1662+
0x58, 0x70, 0x72, 0x73, 0xa9, 0x6a, 0x40, 0xf0,
1663+
0xa0, 0x19, 0x60, 0x62, 0x1a, 0xc6, 0x12, 0x74,
1664+
0x8b, 0x9b, 0xbf, 0xbe, 0x7e, 0xb4, 0xce, 0x3c
1665+
);
1666+
1667+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test6_confounder,
1668+
0xb8, 0x0d, 0x32, 0x51, 0xc1, 0xf6, 0x47, 0x14,
1669+
0x94, 0x25, 0x6f, 0xfe, 0x71, 0x2d, 0x0b, 0x9a
1670+
);
1671+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test6_expected_result,
1672+
0x4e, 0xd7, 0xb3, 0x7c, 0x2b, 0xca, 0xc8, 0xf7,
1673+
0x4f, 0x23, 0xc1, 0xcf, 0x07, 0xe6, 0x2b, 0xc7,
1674+
0xb7, 0x5f, 0xb3, 0xf6, 0x37, 0xb9
1675+
);
1676+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test6_expected_hmac,
1677+
0xf5, 0x59, 0xc7, 0xf6, 0x64, 0xf6, 0x9e, 0xab,
1678+
0x7b, 0x60, 0x92, 0x23, 0x75, 0x26, 0xea, 0x0d,
1679+
0x1f, 0x61, 0xcb, 0x20, 0xd6, 0x9d, 0x10, 0xf2
1680+
);
1681+
1682+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test7_confounder,
1683+
0x53, 0xbf, 0x8a, 0x0d, 0x10, 0x52, 0x65, 0xd4,
1684+
0xe2, 0x76, 0x42, 0x86, 0x24, 0xce, 0x5e, 0x63
1685+
);
1686+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test7_expected_result,
1687+
0xbc, 0x47, 0xff, 0xec, 0x79, 0x98, 0xeb, 0x91,
1688+
0xe8, 0x11, 0x5c, 0xf8, 0xd1, 0x9d, 0xac, 0x4b,
1689+
0xbb, 0xe2, 0xe1, 0x63, 0xe8, 0x7d, 0xd3, 0x7f,
1690+
0x49, 0xbe, 0xca, 0x92, 0x02, 0x77, 0x64, 0xf6
1691+
);
1692+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test7_expected_hmac,
1693+
0x8c, 0xf5, 0x1f, 0x14, 0xd7, 0x98, 0xc2, 0x27,
1694+
0x3f, 0x35, 0xdf, 0x57, 0x4d, 0x1f, 0x93, 0x2e,
1695+
0x40, 0xc4, 0xff, 0x25, 0x5b, 0x36, 0xa2, 0x66
1696+
);
1697+
1698+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test8_confounder,
1699+
0x76, 0x3e, 0x65, 0x36, 0x7e, 0x86, 0x4f, 0x02,
1700+
0xf5, 0x51, 0x53, 0xc7, 0xe3, 0xb5, 0x8a, 0xf1
1701+
);
1702+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test8_expected_result,
1703+
0x40, 0x01, 0x3e, 0x2d, 0xf5, 0x8e, 0x87, 0x51,
1704+
0x95, 0x7d, 0x28, 0x78, 0xbc, 0xd2, 0xd6, 0xfe,
1705+
0x10, 0x1c, 0xcf, 0xd5, 0x56, 0xcb, 0x1e, 0xae,
1706+
0x79, 0xdb, 0x3c, 0x3e, 0xe8, 0x64, 0x29, 0xf2,
1707+
0xb2, 0xa6, 0x02, 0xac, 0x86
1708+
);
1709+
DEFINE_HEX_XDR_NETOBJ(rfc8009_enc_test8_expected_hmac,
1710+
0xfe, 0xf6, 0xec, 0xb6, 0x47, 0xd6, 0x29, 0x5f,
1711+
0xae, 0x07, 0x7a, 0x1f, 0xeb, 0x51, 0x75, 0x08,
1712+
0xd2, 0xc1, 0x6b, 0x41, 0x92, 0xe0, 0x1f, 0x62
1713+
);
1714+
1715+
static const struct gss_krb5_test_param rfc8009_encrypt_test_params[] = {
1716+
{
1717+
.desc = "Encrypt empty plaintext with aes128-cts-hmac-sha256-128",
1718+
.enctype = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
1719+
.plaintext = &rfc8009_enc_empty_plaintext,
1720+
.confounder = &rfc8009_enc_test1_confounder,
1721+
.base_key = &aes128_cts_hmac_sha256_128_basekey,
1722+
.expected_result = &rfc8009_enc_test1_expected_result,
1723+
.expected_hmac = &rfc8009_enc_test1_expected_hmac,
1724+
},
1725+
{
1726+
.desc = "Encrypt short plaintext with aes128-cts-hmac-sha256-128",
1727+
.enctype = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
1728+
.plaintext = &rfc8009_enc_short_plaintext,
1729+
.confounder = &rfc8009_enc_test2_confounder,
1730+
.base_key = &aes128_cts_hmac_sha256_128_basekey,
1731+
.expected_result = &rfc8009_enc_test2_expected_result,
1732+
.expected_hmac = &rfc8009_enc_test2_expected_hmac,
1733+
},
1734+
{
1735+
.desc = "Encrypt block plaintext with aes128-cts-hmac-sha256-128",
1736+
.enctype = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
1737+
.plaintext = &rfc8009_enc_block_plaintext,
1738+
.confounder = &rfc8009_enc_test3_confounder,
1739+
.base_key = &aes128_cts_hmac_sha256_128_basekey,
1740+
.expected_result = &rfc8009_enc_test3_expected_result,
1741+
.expected_hmac = &rfc8009_enc_test3_expected_hmac,
1742+
},
1743+
{
1744+
.desc = "Encrypt long plaintext with aes128-cts-hmac-sha256-128",
1745+
.enctype = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
1746+
.plaintext = &rfc8009_enc_long_plaintext,
1747+
.confounder = &rfc8009_enc_test4_confounder,
1748+
.base_key = &aes128_cts_hmac_sha256_128_basekey,
1749+
.expected_result = &rfc8009_enc_test4_expected_result,
1750+
.expected_hmac = &rfc8009_enc_test4_expected_hmac,
1751+
},
1752+
{
1753+
.desc = "Encrypt empty plaintext with aes256-cts-hmac-sha384-192",
1754+
.enctype = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
1755+
.plaintext = &rfc8009_enc_empty_plaintext,
1756+
.confounder = &rfc8009_enc_test5_confounder,
1757+
.base_key = &aes256_cts_hmac_sha384_192_basekey,
1758+
.expected_result = &rfc8009_enc_test5_expected_result,
1759+
.expected_hmac = &rfc8009_enc_test5_expected_hmac,
1760+
},
1761+
{
1762+
.desc = "Encrypt short plaintext with aes256-cts-hmac-sha384-192",
1763+
.enctype = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
1764+
.plaintext = &rfc8009_enc_short_plaintext,
1765+
.confounder = &rfc8009_enc_test6_confounder,
1766+
.base_key = &aes256_cts_hmac_sha384_192_basekey,
1767+
.expected_result = &rfc8009_enc_test6_expected_result,
1768+
.expected_hmac = &rfc8009_enc_test6_expected_hmac,
1769+
},
1770+
{
1771+
.desc = "Encrypt block plaintext with aes256-cts-hmac-sha384-192",
1772+
.enctype = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
1773+
.plaintext = &rfc8009_enc_block_plaintext,
1774+
.confounder = &rfc8009_enc_test7_confounder,
1775+
.base_key = &aes256_cts_hmac_sha384_192_basekey,
1776+
.expected_result = &rfc8009_enc_test7_expected_result,
1777+
.expected_hmac = &rfc8009_enc_test7_expected_hmac,
1778+
},
1779+
{
1780+
.desc = "Encrypt long plaintext with aes256-cts-hmac-sha384-192",
1781+
.enctype = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
1782+
.plaintext = &rfc8009_enc_long_plaintext,
1783+
.confounder = &rfc8009_enc_test8_confounder,
1784+
.base_key = &aes256_cts_hmac_sha384_192_basekey,
1785+
.expected_result = &rfc8009_enc_test8_expected_result,
1786+
.expected_hmac = &rfc8009_enc_test8_expected_hmac,
1787+
},
1788+
};
1789+
1790+
/* Creates the function rfc8009_encrypt_gen_params */
1791+
KUNIT_ARRAY_PARAM(rfc8009_encrypt, rfc8009_encrypt_test_params,
1792+
gss_krb5_get_desc);
1793+
1794+
static void rfc8009_encrypt_case(struct kunit *test)
1795+
{
1796+
const struct gss_krb5_test_param *param = test->param_value;
1797+
struct crypto_sync_skcipher *cts_tfm, *cbc_tfm;
1798+
const struct gss_krb5_enctype *gk5e;
1799+
struct xdr_netobj Ke, Ki, checksum;
1800+
u8 usage_data[GSS_KRB5_K5CLENGTH];
1801+
struct xdr_netobj usage = {
1802+
.data = usage_data,
1803+
.len = sizeof(usage_data),
1804+
};
1805+
struct crypto_ahash *ahash_tfm;
1806+
struct xdr_buf buf;
1807+
void *text;
1808+
size_t len;
1809+
u32 err;
1810+
1811+
/* Arrange */
1812+
gk5e = gss_krb5_lookup_enctype(param->enctype);
1813+
KUNIT_ASSERT_NOT_NULL(test, gk5e);
1814+
1815+
*(__be32 *)usage.data = cpu_to_be32(2);
1816+
1817+
Ke.len = gk5e->Ke_length;
1818+
Ke.data = kunit_kzalloc(test, Ke.len, GFP_KERNEL);
1819+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, Ke.data);
1820+
usage.data[4] = KEY_USAGE_SEED_ENCRYPTION;
1821+
err = gk5e->derive_key(gk5e, param->base_key, &Ke,
1822+
&usage, GFP_KERNEL);
1823+
KUNIT_ASSERT_EQ(test, err, 0);
1824+
1825+
cbc_tfm = crypto_alloc_sync_skcipher(gk5e->aux_cipher, 0, 0);
1826+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cbc_tfm);
1827+
err = crypto_sync_skcipher_setkey(cbc_tfm, Ke.data, Ke.len);
1828+
KUNIT_ASSERT_EQ(test, err, 0);
1829+
1830+
cts_tfm = crypto_alloc_sync_skcipher(gk5e->encrypt_name, 0, 0);
1831+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cts_tfm);
1832+
err = crypto_sync_skcipher_setkey(cts_tfm, Ke.data, Ke.len);
1833+
KUNIT_ASSERT_EQ(test, err, 0);
1834+
1835+
len = param->confounder->len + param->plaintext->len;
1836+
text = kunit_kzalloc(test, len, GFP_KERNEL);
1837+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, text);
1838+
memcpy(text, param->confounder->data, param->confounder->len);
1839+
memcpy(text + param->confounder->len, param->plaintext->data,
1840+
param->plaintext->len);
1841+
1842+
memset(&buf, 0, sizeof(buf));
1843+
buf.head[0].iov_base = text;
1844+
buf.head[0].iov_len = param->confounder->len + param->plaintext->len;
1845+
buf.len = buf.head[0].iov_len;
1846+
1847+
checksum.len = gk5e->cksumlength;
1848+
checksum.data = kunit_kzalloc(test, checksum.len, GFP_KERNEL);
1849+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, checksum.data);
1850+
1851+
Ki.len = gk5e->Ki_length;
1852+
Ki.data = kunit_kzalloc(test, Ki.len, GFP_KERNEL);
1853+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, Ki.data);
1854+
usage.data[4] = KEY_USAGE_SEED_INTEGRITY;
1855+
err = gk5e->derive_key(gk5e, param->base_key, &Ki,
1856+
&usage, GFP_KERNEL);
1857+
KUNIT_ASSERT_EQ(test, err, 0);
1858+
1859+
ahash_tfm = crypto_alloc_ahash(gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
1860+
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ahash_tfm);
1861+
err = crypto_ahash_setkey(ahash_tfm, Ki.data, Ki.len);
1862+
KUNIT_ASSERT_EQ(test, err, 0);
1863+
1864+
/* Act */
1865+
err = krb5_cbc_cts_encrypt(cts_tfm, cbc_tfm, 0, &buf, NULL, NULL, 0);
1866+
KUNIT_ASSERT_EQ(test, err, 0);
1867+
err = krb5_etm_checksum(cts_tfm, ahash_tfm, &buf, 0, &checksum);
1868+
KUNIT_ASSERT_EQ(test, err, 0);
1869+
1870+
/* Assert */
1871+
KUNIT_EXPECT_EQ_MSG(test,
1872+
param->expected_result->len, buf.len,
1873+
"ciphertext length mismatch");
1874+
KUNIT_EXPECT_EQ_MSG(test,
1875+
memcmp(param->expected_result->data,
1876+
buf.head[0].iov_base,
1877+
param->expected_result->len), 0,
1878+
"ciphertext mismatch");
1879+
KUNIT_EXPECT_EQ_MSG(test, memcmp(param->expected_hmac->data,
1880+
checksum.data,
1881+
checksum.len), 0,
1882+
"HMAC mismatch");
1883+
1884+
crypto_free_ahash(ahash_tfm);
1885+
crypto_free_sync_skcipher(cts_tfm);
1886+
crypto_free_sync_skcipher(cbc_tfm);
1887+
}
1888+
15651889
static struct kunit_case rfc8009_test_cases[] = {
15661890
{
15671891
.name = "RFC 8009 key derivation",
@@ -1573,6 +1897,11 @@ static struct kunit_case rfc8009_test_cases[] = {
15731897
.run_case = checksum_case,
15741898
.generate_params = rfc8009_checksum_gen_params,
15751899
},
1900+
{
1901+
.name = "RFC 8009 encryption",
1902+
.run_case = rfc8009_encrypt_case,
1903+
.generate_params = rfc8009_encrypt_gen_params,
1904+
},
15761905
};
15771906

15781907
static struct kunit_suite rfc8009_suite = {

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