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crypto: add support for TLS 1.0 record encryption 

This patch adds kernel support for encryption/decryption of TLS 1.0
records using block ciphers. Implementation is similar to authenc in the
sense that the base algorithms (AES, SHA1) are combined in a template to
produce TLS encapsulation frames. The composite algorithm will be called
"tls10(hmac(<digest>),cbc(<cipher>))". The cipher and hmac keys are
wrapped in the same format used by authenc.c.

Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Cristian Stoica <cristian.stoica@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
5.4-rM2-2.2.x-imx-squashed
Radu Alexe 2017-05-03 16:17:13 +03:00 committed by Dong Aisheng
parent 749f4d590f
commit a9278aadeb
6 changed files with 1093 additions and 0 deletions
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20
crypto/Kconfig
View File

@ -341,6 +341,26 @@ config CRYPTO_ECHAINIV
a sequence number xored with a salt. This is the default
algorithm for CBC.
config CRYPTO_TLS
tristate "TLS support"
select CRYPTO_AEAD
select CRYPTO_BLKCIPHER
select CRYPTO_MANAGER
select CRYPTO_HASH
select CRYPTO_NULL
select CRYPTO_AUTHENC
help
Support for TLS 1.0 record encryption and decryption
This module adds support for encryption/decryption of TLS 1.0 frames
using blockcipher algorithms. The name of the resulting algorithm is
"tls10(hmac(<digest>),cbc(<cipher>))". By default, the generic base
algorithms are used (e.g. aes-generic, sha1-generic), but hardware
accelerated versions will be used automatically if available.
User-space applications (OpenSSL, GnuTLS) can offload TLS 1.0
operations through AF_ALG or cryptodev interfaces
comment "Block modes"
config CRYPTO_CBC

1
crypto/Makefile
View File

@ -143,6 +143,7 @@ obj-$(CONFIG_CRYPTO_CRC32) += crc32_generic.o
obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif_common.o crct10dif_generic.o
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o
obj-$(CONFIG_CRYPTO_LZO) += lzo.o lzo-rle.o
obj-$(CONFIG_CRYPTO_TLS) += tls.o
obj-$(CONFIG_CRYPTO_LZ4) += lz4.o
obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o
obj-$(CONFIG_CRYPTO_XXHASH) += xxhash_generic.o

3
crypto/tcrypt.c
View File

@ -2049,6 +2049,9 @@ static int do_test(const char *alg, u32 type, u32 mask, int m, u32 num_mb)
ret += tcrypt_test("cbc(sm4)");
ret += tcrypt_test("ctr(sm4)");
break;
case 192:
ret += tcrypt_test("tls10(hmac(sha1),cbc(aes))");
break;
case 200:
test_cipher_speed("ecb(aes)", ENCRYPT, sec, NULL, 0,
speed_template_16_24_32);

238
crypto/testmgr.c
View File

@ -111,6 +111,13 @@ struct drbg_test_suite {
unsigned int count;
};
struct tls_test_suite {
struct {
struct tls_testvec *vecs;
unsigned int count;
} enc, dec;
};
struct akcipher_test_suite {
const struct akcipher_testvec *vecs;
unsigned int count;
@ -135,6 +142,7 @@ struct alg_test_desc {
struct hash_test_suite hash;
struct cprng_test_suite cprng;
struct drbg_test_suite drbg;
struct tls_test_suite tls;
struct akcipher_test_suite akcipher;
struct kpp_test_suite kpp;
} suite;
@ -2291,6 +2299,227 @@ static int test_aead(const char *driver, int enc,
return 0;
}
static int __test_tls(struct crypto_aead *tfm, int enc,
struct tls_testvec *template, unsigned int tcount,
const bool diff_dst)
{
const char *algo = crypto_tfm_alg_driver_name(crypto_aead_tfm(tfm));
unsigned int i, k, authsize;
char *q;
struct aead_request *req;
struct scatterlist *sg;
struct scatterlist *sgout;
const char *e, *d;
struct crypto_wait wait;
void *input;
void *output;
void *assoc;
char *iv;
char *key;
char *xbuf[XBUFSIZE];
char *xoutbuf[XBUFSIZE];
char *axbuf[XBUFSIZE];
int ret = -ENOMEM;
if (testmgr_alloc_buf(xbuf))
goto out_noxbuf;
if (diff_dst && testmgr_alloc_buf(xoutbuf))
goto out_nooutbuf;
if (testmgr_alloc_buf(axbuf))
goto out_noaxbuf;
iv = kzalloc(MAX_IVLEN, GFP_KERNEL);
if (!iv)
goto out_noiv;
key = kzalloc(MAX_KEYLEN, GFP_KERNEL);
if (!key)
goto out_nokey;
sg = kmalloc(sizeof(*sg) * 8 * (diff_dst ? 2 : 1), GFP_KERNEL);
if (!sg)
goto out_nosg;
sgout = sg + 8;
d = diff_dst ? "-ddst" : "";
e = enc ? "encryption" : "decryption";
crypto_init_wait(&wait);
req = aead_request_alloc(tfm, GFP_KERNEL);
if (!req) {
pr_err("alg: tls%s: Failed to allocate request for %s\n",
d, algo);
goto out;
}
aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_req_done, &wait);
for (i = 0; i < tcount; i++) {
input = xbuf[0];
assoc = axbuf[0];
ret = -EINVAL;
if (WARN_ON(template[i].ilen > PAGE_SIZE ||
template[i].alen > PAGE_SIZE))
goto out;
memcpy(assoc, template[i].assoc, template[i].alen);
memcpy(input, template[i].input, template[i].ilen);
if (template[i].iv)
memcpy(iv, template[i].iv, MAX_IVLEN);
else
memset(iv, 0, MAX_IVLEN);
crypto_aead_clear_flags(tfm, ~0);
if (template[i].klen > MAX_KEYLEN) {
pr_err("alg: aead%s: setkey failed on test %d for %s: key size %d > %d\n",
d, i, algo, template[i].klen, MAX_KEYLEN);
ret = -EINVAL;
goto out;
}
memcpy(key, template[i].key, template[i].klen);
ret = crypto_aead_setkey(tfm, key, template[i].klen);
if (!ret == template[i].fail) {
pr_err("alg: tls%s: setkey failed on test %d for %s: flags=%x\n",
d, i, algo, crypto_aead_get_flags(tfm));
goto out;
} else if (ret)
continue;
authsize = 20;
ret = crypto_aead_setauthsize(tfm, authsize);
if (ret) {
pr_err("alg: aead%s: Failed to set authsize to %u on test %d for %s\n",
d, authsize, i, algo);
goto out;
}
k = !!template[i].alen;
sg_init_table(sg, k + 1);
sg_set_buf(&sg[0], assoc, template[i].alen);
sg_set_buf(&sg[k], input, (enc ? template[i].rlen :
template[i].ilen));
output = input;
if (diff_dst) {
sg_init_table(sgout, k + 1);
sg_set_buf(&sgout[0], assoc, template[i].alen);
output = xoutbuf[0];
sg_set_buf(&sgout[k], output,
(enc ? template[i].rlen : template[i].ilen));
}
aead_request_set_crypt(req, sg, (diff_dst) ? sgout : sg,
template[i].ilen, iv);
aead_request_set_ad(req, template[i].alen);
ret = crypto_wait_req(enc ? crypto_aead_encrypt(req)
: crypto_aead_decrypt(req), &wait);
switch (ret) {
case 0:
if (template[i].novrfy) {
/* verification was supposed to fail */
pr_err("alg: tls%s: %s failed on test %d for %s: ret was 0, expected -EBADMSG\n",
d, e, i, algo);
/* so really, we got a bad message */
ret = -EBADMSG;
goto out;
}
break;
case -EBADMSG:
/* verification failure was expected */
if (template[i].novrfy)
continue;
/* fall through */
default:
pr_err("alg: tls%s: %s failed on test %d for %s: ret=%d\n",
d, e, i, algo, -ret);
goto out;
}
q = output;
if (memcmp(q, template[i].result, template[i].rlen)) {
pr_err("alg: tls%s: Test %d failed on %s for %s\n",
d, i, e, algo);
hexdump(q, template[i].rlen);
pr_err("should be:\n");
hexdump(template[i].result, template[i].rlen);
ret = -EINVAL;
goto out;
}
}
out:
aead_request_free(req);
kfree(sg);
out_nosg:
kfree(key);
out_nokey:
kfree(iv);
out_noiv:
testmgr_free_buf(axbuf);
out_noaxbuf:
if (diff_dst)
testmgr_free_buf(xoutbuf);
out_nooutbuf:
testmgr_free_buf(xbuf);
out_noxbuf:
return ret;
}
static int test_tls(struct crypto_aead *tfm, int enc,
struct tls_testvec *template, unsigned int tcount)
{
int ret;
/* test 'dst == src' case */
ret = __test_tls(tfm, enc, template, tcount, false);
if (ret)
return ret;
/* test 'dst != src' case */
return __test_tls(tfm, enc, template, tcount, true);
}
static int alg_test_tls(const struct alg_test_desc *desc, const char *driver,
u32 type, u32 mask)
{
struct crypto_aead *tfm;
int err = 0;
tfm = crypto_alloc_aead(driver, type, mask);
if (IS_ERR(tfm)) {
pr_err("alg: aead: Failed to load transform for %s: %ld\n",
driver, PTR_ERR(tfm));
return PTR_ERR(tfm);
}
if (desc->suite.tls.enc.vecs) {
err = test_tls(tfm, ENCRYPT, desc->suite.tls.enc.vecs,
desc->suite.tls.enc.count);
if (err)
goto out;
}
if (!err && desc->suite.tls.dec.vecs)
err = test_tls(tfm, DECRYPT, desc->suite.tls.dec.vecs,
desc->suite.tls.dec.count);
out:
crypto_free_aead(tfm);
return err;
}
static int alg_test_aead(const struct alg_test_desc *desc, const char *driver,
u32 type, u32 mask)
{
@ -4999,6 +5228,15 @@ static const struct alg_test_desc alg_test_descs[] = {
.suite = {
.hash = __VECS(tgr192_tv_template)
}
}, {
.alg = "tls10(hmac(sha1),cbc(aes))",
.test = alg_test_tls,
.suite = {
.tls = {
.enc = __VECS(tls_enc_tv_template),
.dec = __VECS(tls_dec_tv_template)
}
}
}, {
.alg = "vmac64(aes)",
.test = alg_test_hash,

224
crypto/testmgr.h
View File

@ -21,7 +21,12 @@
#define _CRYPTO_TESTMGR_H
#include <linux/oid_registry.h>
#include <linux/netlink.h>
#define MAX_DIGEST_SIZE 64
#define MAX_TAP 8
#define MAX_KEYLEN 160
#define MAX_IVLEN 32
/*
@ -140,6 +145,20 @@ struct drbg_testvec {
size_t expectedlen;
};
struct tls_testvec {
char *key; /* wrapped keys for encryption and authentication */
char *iv; /* initialization vector */
char *input; /* input data */
char *assoc; /* associated data: seq num, type, version, input len */
char *result; /* result data */
unsigned char fail; /* the test failure is expected */
unsigned char novrfy; /* dec verification failure expected */
unsigned char klen; /* key length */
unsigned short ilen; /* input data length */
unsigned short alen; /* associated data length */
unsigned short rlen; /* result length */
};
struct akcipher_testvec {
const unsigned char *key;
const unsigned char *params;
@ -170,6 +189,211 @@ struct kpp_testvec {
static const char zeroed_string[48];
/*
* TLS1.0 synthetic test vectors
*/
static struct tls_testvec tls_enc_tv_template[] = {
{
#ifdef __LITTLE_ENDIAN
.key = "\x08\x00" /* rta length */
"\x01\x00" /* rta type */
#else
.key = "\x00\x08" /* rta length */
"\x00\x01" /* rta type */
#endif
"\x00\x00\x00\x10" /* enc key length */
"authenticationkey20benckeyis16_bytes",
.klen = 8 + 20 + 16,
.iv = "iv0123456789abcd",
.input = "Single block msg",
.ilen = 16,
.assoc = "\x00\x01\x02\x03\x04\x05\x06\x07"
"\x00\x03\x01\x00\x10",
.alen = 13,
.result = "\xd5\xac\xb\xd2\xac\xad\x3f\xb1"
"\x59\x79\x1e\x91\x5f\x52\x14\x9c"
"\xc0\x75\xd8\x4c\x97\x0f\x07\x73"
"\xdc\x89\x47\x49\x49\xcb\x30\x6b"
"\x1b\x45\x23\xa1\xd0\x51\xcf\x02"
"\x2e\xa8\x5d\xa0\xfe\xca\x82\x61",
.rlen = 16 + 20 + 12,
}, {
#ifdef __LITTLE_ENDIAN
.key = "\x08\x00" /* rta length */
"\x01\x00" /* rta type */
#else
.key = "\x00\x08" /* rta length */
"\x00\x01" /* rta type */
#endif
"\x00\x00\x00\x10" /* enc key length */
"authenticationkey20benckeyis16_bytes",
.klen = 8 + 20 + 16,
.iv = "iv0123456789abcd",
.input = "",
.ilen = 0,
.assoc = "\x00\x01\x02\x03\x04\x05\x06\x07"
"\x00\x03\x01\x00\x00",
.alen = 13,
.result = "\x58\x2a\x11\xc\x86\x8e\x4b\x67"
"\x2d\x16\x26\x1a\xac\x4b\xe2\x1a"
"\xe9\x6a\xcc\x4d\x6f\x79\x8a\x45"
"\x1f\x4e\x27\xf2\xa7\x59\xb4\x5a",
.rlen = 20 + 12,
}, {
#ifdef __LITTLE_ENDIAN
.key = "\x08\x00" /* rta length */
"\x01\x00" /* rta type */
#else
.key = "\x00\x08" /* rta length */
"\x00\x01" /* rta type */
#endif
"\x00\x00\x00\x10" /* enc key length */
"authenticationkey20benckeyis16_bytes",
.klen = 8 + 20 + 16,
.iv = "iv0123456789abcd",
.input = "285 bytes plaintext285 bytes plaintext285 bytes"
" plaintext285 bytes plaintext285 bytes plaintext285"
" bytes plaintext285 bytes plaintext285 bytes"
" plaintext285 bytes plaintext285 bytes plaintext285"
" bytes plaintext285 bytes plaintext285 bytes"
" plaintext285 bytes plaintext285 bytes plaintext285"
" bytes plaintext285 bytes plaintext",
.ilen = 285,
.assoc = "\x00\x01\x02\x03\x04\x05\x06\x07"
"\x00\x03\x01\x01\x1d",
.alen = 13,
.result = "\x80\x23\x82\x44\x14\x2a\x1d\x94\xc\xc2\x1d\xd"
"\x3a\x32\x89\x4c\x57\x30\xa8\x89\x76\x46\xcc\x90"
"\x1d\x88\xb8\xa6\x1a\x58\xe\x2d\xeb\x2c\xc7\x3a"
"\x52\x4e\xdb\xb3\x1e\x83\x11\xf5\x3c\xce\x6e\x94"
"\xd3\x26\x6a\x9a\xd\xbd\xc7\x98\xb9\xb3\x3a\x51"
"\x1e\x4\x84\x8a\x8f\x54\x9a\x51\x69\x9c\xce\x31"
"\x8d\x5d\x8b\xee\x5f\x70\xc\xc9\xb8\x50\x54\xf8"
"\xb2\x4a\x7a\xcd\xeb\x7a\x82\x81\xc6\x41\xc8\x50"
"\x91\x8d\xc8\xed\xcd\x40\x8f\x55\xd1\xec\xc9\xac"
"\x15\x18\xf9\x20\xa0\xed\x18\xa1\xe3\x56\xe3\x14"
"\xe5\xe8\x66\x63\x20\xed\xe4\x62\x9d\xa3\xa4\x1d"
"\x81\x89\x18\xf2\x36\xae\xc8\x8a\x2b\xbc\xc3\xb8"
"\x80\xf\x97\x21\x36\x39\x8\x84\x23\x18\x9e\x9c"
"\x72\x32\x75\x2d\x2e\xf9\x60\xb\xe8\xcc\xd9\x74"
"\x4\x1b\x8e\x99\xc1\x94\xee\xd0\xac\x4e\xfc\x7e"
"\xf1\x96\xb3\xe7\x14\xb8\xf2\xc\x25\x97\x82\x6b"
"\xbd\x0\x65\xab\x5c\xe3\x16\xfb\x68\xef\xea\x9d"
"\xff\x44\x1d\x2a\x44\xf5\xc8\x56\x77\xb7\xbf\x13"
"\xc8\x54\xdb\x92\xfe\x16\x4c\xbe\x18\xe9\xb\x8d"
"\xb\xd4\x43\x58\x43\xaa\xf4\x3\x80\x97\x62\xd5"
"\xdf\x3c\x28\xaa\xee\x48\x4b\x55\x41\x1b\x31\x2"
"\xbe\xa0\x1c\xbd\xb7\x22\x2a\xe5\x53\x72\x73\x20"
"\x44\x4f\xe6\x1\x2b\x34\x33\x11\x7d\xfb\x10\xc1"
"\x66\x7c\xa6\xf4\x48\x36\x5e\x2\xda\x41\x4b\x3e"
"\xe7\x80\x17\x17\xce\xf1\x3e\x6a\x8e\x26\xf3\xb7"
"\x2b\x85\xd\x31\x8d\xba\x6c\x22\xb4\x28\x55\x7e"
"\x2a\x9e\x26\xf1\x3d\x21\xac\x65",
.rlen = 285 + 20 + 15,
}
};
static struct tls_testvec tls_dec_tv_template[] = {
{
#ifdef __LITTLE_ENDIAN
.key = "\x08\x00" /* rta length */
"\x01\x00" /* rta type */
#else
.key = "\x00\x08" /* rta length */
"\x00\x01" /* rta type */
#endif
"\x00\x00\x00\x10" /* enc key length */
"authenticationkey20benckeyis16_bytes",
.klen = 8 + 20 + 16,
.iv = "iv0123456789abcd",
.input = "\xd5\xac\xb\xd2\xac\xad\x3f\xb1"
"\x59\x79\x1e\x91\x5f\x52\x14\x9c"
"\xc0\x75\xd8\x4c\x97\x0f\x07\x73"
"\xdc\x89\x47\x49\x49\xcb\x30\x6b"
"\x1b\x45\x23\xa1\xd0\x51\xcf\x02"
"\x2e\xa8\x5d\xa0\xfe\xca\x82\x61",
.ilen = 16 + 20 + 12,
.assoc = "\x00\x01\x02\x03\x04\x05\x06\x07"
"\x00\x03\x01\x00\x30",
.alen = 13,
.result = "Single block msg",
.rlen = 16,
}, {
#ifdef __LITTLE_ENDIAN
.key = "\x08\x00" /* rta length */
"\x01\x00" /* rta type */
#else
.key = "\x00\x08" /* rta length */
"\x00\x01" /* rta type */
#endif
"\x00\x00\x00\x10" /* enc key length */
"authenticationkey20benckeyis16_bytes",
.klen = 8 + 20 + 16,
.iv = "iv0123456789abcd",
.input = "\x58\x2a\x11\xc\x86\x8e\x4b\x67"
"\x2d\x16\x26\x1a\xac\x4b\xe2\x1a"
"\xe9\x6a\xcc\x4d\x6f\x79\x8a\x45"
"\x1f\x4e\x27\xf2\xa7\x59\xb4\x5a",
.ilen = 20 + 12,
.assoc = "\x00\x01\x02\x03\x04\x05\x06\x07"
"\x00\x03\x01\x00\x20",
.alen = 13,
.result = "",
.rlen = 0,
}, {
#ifdef __LITTLE_ENDIAN
.key = "\x08\x00" /* rta length */
"\x01\x00" /* rta type */
#else
.key = "\x00\x08" /* rta length */
"\x00\x01" /* rta type */
#endif
"\x00\x00\x00\x10" /* enc key length */
"authenticationkey20benckeyis16_bytes",
.klen = 8 + 20 + 16,
.iv = "iv0123456789abcd",
.input = "\x80\x23\x82\x44\x14\x2a\x1d\x94\xc\xc2\x1d\xd"
"\x3a\x32\x89\x4c\x57\x30\xa8\x89\x76\x46\xcc\x90"
"\x1d\x88\xb8\xa6\x1a\x58\xe\x2d\xeb\x2c\xc7\x3a"
"\x52\x4e\xdb\xb3\x1e\x83\x11\xf5\x3c\xce\x6e\x94"
"\xd3\x26\x6a\x9a\xd\xbd\xc7\x98\xb9\xb3\x3a\x51"
"\x1e\x4\x84\x8a\x8f\x54\x9a\x51\x69\x9c\xce\x31"
"\x8d\x5d\x8b\xee\x5f\x70\xc\xc9\xb8\x50\x54\xf8"
"\xb2\x4a\x7a\xcd\xeb\x7a\x82\x81\xc6\x41\xc8\x50"
"\x91\x8d\xc8\xed\xcd\x40\x8f\x55\xd1\xec\xc9\xac"
"\x15\x18\xf9\x20\xa0\xed\x18\xa1\xe3\x56\xe3\x14"
"\xe5\xe8\x66\x63\x20\xed\xe4\x62\x9d\xa3\xa4\x1d"
"\x81\x89\x18\xf2\x36\xae\xc8\x8a\x2b\xbc\xc3\xb8"
"\x80\xf\x97\x21\x36\x39\x8\x84\x23\x18\x9e\x9c"
"\x72\x32\x75\x2d\x2e\xf9\x60\xb\xe8\xcc\xd9\x74"
"\x4\x1b\x8e\x99\xc1\x94\xee\xd0\xac\x4e\xfc\x7e"
"\xf1\x96\xb3\xe7\x14\xb8\xf2\xc\x25\x97\x82\x6b"
"\xbd\x0\x65\xab\x5c\xe3\x16\xfb\x68\xef\xea\x9d"
"\xff\x44\x1d\x2a\x44\xf5\xc8\x56\x77\xb7\xbf\x13"
"\xc8\x54\xdb\x92\xfe\x16\x4c\xbe\x18\xe9\xb\x8d"
"\xb\xd4\x43\x58\x43\xaa\xf4\x3\x80\x97\x62\xd5"
"\xdf\x3c\x28\xaa\xee\x48\x4b\x55\x41\x1b\x31\x2"
"\xbe\xa0\x1c\xbd\xb7\x22\x2a\xe5\x53\x72\x73\x20"
"\x44\x4f\xe6\x1\x2b\x34\x33\x11\x7d\xfb\x10\xc1"
"\x66\x7c\xa6\xf4\x48\x36\x5e\x2\xda\x41\x4b\x3e"
"\xe7\x80\x17\x17\xce\xf1\x3e\x6a\x8e\x26\xf3\xb7"
"\x2b\x85\xd\x31\x8d\xba\x6c\x22\xb4\x28\x55\x7e"
"\x2a\x9e\x26\xf1\x3d\x21\xac\x65",
.ilen = 285 + 20 + 15,
.assoc = "\x00\x01\x02\x03\x04\x05\x06\x07"
"\x00\x03\x01\x01\x40",
.alen = 13,
.result = "285 bytes plaintext285 bytes plaintext285 bytes"
" plaintext285 bytes plaintext285 bytes plaintext285"
" bytes plaintext285 bytes plaintext285 bytes"
" plaintext285 bytes plaintext285 bytes plaintext285"
" bytes plaintext285 bytes plaintext285 bytes"
" plaintext285 bytes plaintext285 bytes plaintext",
.rlen = 285,
}
};
/*
* RSA test vectors. Borrowed from openSSL.
*/

607
crypto/tls.c 100644
View File

@ -0,0 +1,607 @@
/*
* Copyright 2013 Freescale Semiconductor, Inc.
* Copyright 2017 NXP Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/authenc.h>
#include <crypto/null.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
struct tls_instance_ctx {
struct crypto_ahash_spawn auth;
struct crypto_skcipher_spawn enc;
};
struct crypto_tls_ctx {
unsigned int reqoff;
struct crypto_ahash *auth;
struct crypto_skcipher *enc;
struct crypto_sync_skcipher *null;
};
struct tls_request_ctx {
/*
* cryptlen holds the payload length in the case of encryption or
* payload_len + icv_len + padding_len in case of decryption
*/
unsigned int cryptlen;
/* working space for partial results */
struct scatterlist tmp[2];
struct scatterlist cipher[2];
struct scatterlist dst[2];
char tail[];
};
struct async_op {
struct completion completion;
int err;
};
static void tls_async_op_done(struct crypto_async_request *req, int err)
{
struct async_op *areq = req->data;
if (err == -EINPROGRESS)
return;
areq->err = err;
complete(&areq->completion);
}
static int crypto_tls_setkey(struct crypto_aead *tls, const u8 *key,
unsigned int keylen)
{
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tls);
struct crypto_ahash *auth = ctx->auth;
struct crypto_skcipher *enc = ctx->enc;
struct crypto_authenc_keys keys;
int err = -EINVAL;
if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
goto badkey;
crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
crypto_ahash_set_flags(auth, crypto_aead_get_flags(tls) &
CRYPTO_TFM_REQ_MASK);
err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
crypto_aead_set_flags(tls, crypto_ahash_get_flags(auth) &
CRYPTO_TFM_RES_MASK);
if (err)
goto out;
crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(enc, crypto_aead_get_flags(tls) &
CRYPTO_TFM_REQ_MASK);
err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
crypto_aead_set_flags(tls, crypto_skcipher_get_flags(enc) &
CRYPTO_TFM_RES_MASK);
out:
return err;
badkey:
crypto_aead_set_flags(tls, CRYPTO_TFM_RES_BAD_KEY_LEN);
goto out;
}
/**
* crypto_tls_genicv - Calculate hmac digest for a TLS record
* @hash: (output) buffer to save the digest into
* @src: (input) scatterlist with the assoc and payload data
* @srclen: (input) size of the source buffer (assoclen + cryptlen)
* @req: (input) aead request
**/
static int crypto_tls_genicv(u8 *hash, struct scatterlist *src,
unsigned int srclen, struct aead_request *req)
{
struct crypto_aead *tls = crypto_aead_reqtfm(req);
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tls);
struct tls_request_ctx *treq_ctx = aead_request_ctx(req);
struct async_op ahash_op;
struct ahash_request *ahreq = (void *)(treq_ctx->tail + ctx->reqoff);
unsigned int flags = CRYPTO_TFM_REQ_MAY_SLEEP;
int err = -EBADMSG;
/* Bail out if the request assoc len is 0 */
if (!req->assoclen)
return err;
init_completion(&ahash_op.completion);
/* the hash transform to be executed comes from the original request */
ahash_request_set_tfm(ahreq, ctx->auth);
/* prepare the hash request with input data and result pointer */
ahash_request_set_crypt(ahreq, src, hash, srclen);
/* set the notifier for when the async hash function returns */
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
tls_async_op_done, &ahash_op);
/* Calculate the digest on the given data. The result is put in hash */
err = crypto_ahash_digest(ahreq);
if (err == -EINPROGRESS) {
err = wait_for_completion_interruptible(&ahash_op.completion);
if (!err)
err = ahash_op.err;
}
return err;
}
/**
* crypto_tls_gen_padicv - Calculate and pad hmac digest for a TLS record
* @hash: (output) buffer to save the digest and padding into
* @phashlen: (output) the size of digest + padding
* @req: (input) aead request
**/
static int crypto_tls_gen_padicv(u8 *hash, unsigned int *phashlen,
struct aead_request *req)
{
struct crypto_aead *tls = crypto_aead_reqtfm(req);
unsigned int hash_size = crypto_aead_authsize(tls);
unsigned int block_size = crypto_aead_blocksize(tls);
unsigned int srclen = req->cryptlen + hash_size;
unsigned int icvlen = req->cryptlen + req->assoclen;
unsigned int padlen;
int err;
err = crypto_tls_genicv(hash, req->src, icvlen, req);
if (err)
goto out;
/* add padding after digest */
padlen = block_size - (srclen % block_size);
memset(hash + hash_size, padlen - 1, padlen);
*phashlen = hash_size + padlen;
out:
return err;
}
static int crypto_tls_copy_data(struct aead_request *req,
struct scatterlist *src,
struct scatterlist *dst,
unsigned int len)
{
struct crypto_aead *tls = crypto_aead_reqtfm(req);
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tls);
SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
skcipher_request_set_sync_tfm(skreq, ctx->null);
skcipher_request_set_callback(skreq, aead_request_flags(req),
NULL, NULL);
skcipher_request_set_crypt(skreq, src, dst, len, NULL);
return crypto_skcipher_encrypt(skreq);
}
static int crypto_tls_encrypt(struct aead_request *req)
{
struct crypto_aead *tls = crypto_aead_reqtfm(req);
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tls);
struct tls_request_ctx *treq_ctx = aead_request_ctx(req);
struct skcipher_request *skreq;
struct scatterlist *cipher = treq_ctx->cipher;
struct scatterlist *tmp = treq_ctx->tmp;
struct scatterlist *sg, *src, *dst;
unsigned int cryptlen, phashlen;
u8 *hash = treq_ctx->tail;
int err;
/*
* The hash result is saved at the beginning of the tls request ctx
* and is aligned as required by the hash transform. Enough space was
* allocated in crypto_tls_init_tfm to accommodate the difference. The
* requests themselves start later at treq_ctx->tail + ctx->reqoff so
* the result is not overwritten by the second (cipher) request.
*/
hash = (u8 *)ALIGN((unsigned long)hash +
crypto_ahash_alignmask(ctx->auth),
crypto_ahash_alignmask(ctx->auth) + 1);
/*
* STEP 1: create ICV together with necessary padding
*/
err = crypto_tls_gen_padicv(hash, &phashlen, req);
if (err)
return err;
/*
* STEP 2: Hash and padding are combined with the payload
* depending on the form it arrives. Scatter tables must have at least
* one page of data before chaining with another table and can't have
* an empty data page. The following code addresses these requirements.
*
* If the payload is empty, only the hash is encrypted, otherwise the
* payload scatterlist is merged with the hash. A special merging case
* is when the payload has only one page of data. In that case the
* payload page is moved to another scatterlist and prepared there for
* encryption.
*/
if (req->cryptlen) {
src = scatterwalk_ffwd(tmp, req->src, req->assoclen);
sg_init_table(cipher, 2);
sg_set_buf(cipher + 1, hash, phashlen);
if (sg_is_last(src)) {
sg_set_page(cipher, sg_page(src), req->cryptlen,
src->offset);
src = cipher;
} else {
unsigned int rem_len = req->cryptlen;
for (sg = src; rem_len > sg->length; sg = sg_next(sg))
rem_len -= min(rem_len, sg->length);
sg_set_page(cipher, sg_page(sg), rem_len, sg->offset);
sg_chain(sg, 1, cipher);
}
} else {
sg_init_one(cipher, hash, phashlen);
src = cipher;
}
/**
* If src != dst copy the associated data from source to destination.
* In both cases fast-forward passed the associated data in the dest.
*/
if (req->src != req->dst) {
err = crypto_tls_copy_data(req, req->src, req->dst,
req->assoclen);
if (err)
return err;
}
dst = scatterwalk_ffwd(treq_ctx->dst, req->dst, req->assoclen);
/*
* STEP 3: encrypt the frame and return the result
*/
cryptlen = req->cryptlen + phashlen;
/*
* The hash and the cipher are applied at different times and their
* requests can use the same memory space without interference
*/
skreq = (void *)(treq_ctx->tail + ctx->reqoff);
skcipher_request_set_tfm(skreq, ctx->enc);
skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
skcipher_request_set_callback(skreq, aead_request_flags(req),
req->base.complete, req->base.data);
/*
* Apply the cipher transform. The result will be in req->dst when the
* asynchronuous call terminates
*/
err = crypto_skcipher_encrypt(skreq);
return err;
}
static int crypto_tls_decrypt(struct aead_request *req)
{
struct crypto_aead *tls = crypto_aead_reqtfm(req);
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tls);
struct tls_request_ctx *treq_ctx = aead_request_ctx(req);
unsigned int cryptlen = req->cryptlen;
unsigned int hash_size = crypto_aead_authsize(tls);
unsigned int block_size = crypto_aead_blocksize(tls);
struct skcipher_request *skreq = (void *)(treq_ctx->tail + ctx->reqoff);
struct scatterlist *tmp = treq_ctx->tmp;
struct scatterlist *src, *dst;
u8 padding[255]; /* padding can be 0-255 bytes */
u8 pad_size;
u16 *len_field;
u8 *ihash, *hash = treq_ctx->tail;
int paderr = 0;
int err = -EINVAL;
int i;
struct async_op ciph_op;
/*
* Rule out bad packets. The input packet length must be at least one
* byte more than the hash_size
*/
if (cryptlen <= hash_size || cryptlen % block_size)
goto out;
/*
* Step 1 - Decrypt the source. Fast-forward past the associated data
* to the encrypted data. The result will be overwritten in place so
* that the decrypted data will be adjacent to the associated data. The
* last step (computing the hash) will have it's input data already
* prepared and ready to be accessed at req->src.
*/
src = scatterwalk_ffwd(tmp, req->src, req->assoclen);
dst = src;
init_completion(&ciph_op.completion);
skcipher_request_set_tfm(skreq, ctx->enc);
skcipher_request_set_callback(skreq, aead_request_flags(req),
tls_async_op_done, &ciph_op);
skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
err = crypto_skcipher_decrypt(skreq);
if (err == -EINPROGRESS) {
err = wait_for_completion_interruptible(&ciph_op.completion);
if (!err)
err = ciph_op.err;
}
if (err)
goto out;
/*
* Step 2 - Verify padding
* Retrieve the last byte of the payload; this is the padding size.
*/
cryptlen -= 1;
scatterwalk_map_and_copy(&pad_size, dst, cryptlen, 1, 0);
/* RFC recommendation for invalid padding size. */
if (cryptlen < pad_size + hash_size) {
pad_size = 0;
paderr = -EBADMSG;
}
cryptlen -= pad_size;
scatterwalk_map_and_copy(padding, dst, cryptlen, pad_size, 0);
/* Padding content must be equal with pad_size. We verify it all */
for (i = 0; i < pad_size; i++)
if (padding[i] != pad_size)
paderr = -EBADMSG;
/*
* Step 3 - Verify hash
* Align the digest result as required by the hash transform. Enough
* space was allocated in crypto_tls_init_tfm
*/
hash = (u8 *)ALIGN((unsigned long)hash +
crypto_ahash_alignmask(ctx->auth),
crypto_ahash_alignmask(ctx->auth) + 1);
/*
* Two bytes at the end of the associated data make the length field.
* It must be updated with the length of the cleartext message before
* the hash is calculated.
*/
len_field = sg_virt(req->src) + req->assoclen - 2;
cryptlen -= hash_size;
*len_field = htons(cryptlen);
/* This is the hash from the decrypted packet. Save it for later */
ihash = hash + hash_size;
scatterwalk_map_and_copy(ihash, dst, cryptlen, hash_size, 0);
/* Now compute and compare our ICV with the one from the packet */
err = crypto_tls_genicv(hash, req->src, cryptlen + req->assoclen, req);
if (!err)
err = memcmp(hash, ihash, hash_size) ? -EBADMSG : 0;
if (req->src != req->dst) {
err = crypto_tls_copy_data(req, req->src, req->dst, cryptlen +
req->assoclen);
if (err)
goto out;
}
/* return the first found error */
if (paderr)
err = paderr;
out:
aead_request_complete(req, err);
return err;
}
static int crypto_tls_init_tfm(struct crypto_aead *tfm)
{
struct aead_instance *inst = aead_alg_instance(tfm);
struct tls_instance_ctx *ictx = aead_instance_ctx(inst);
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_ahash *auth;
struct crypto_skcipher *enc;
struct crypto_sync_skcipher *null;
int err;
auth = crypto_spawn_ahash(&ictx->auth);
if (IS_ERR(auth))
return PTR_ERR(auth);
enc = crypto_spawn_skcipher(&ictx->enc);
err = PTR_ERR(enc);
if (IS_ERR(enc))
goto err_free_ahash;
null = crypto_get_default_null_skcipher();
err = PTR_ERR(null);
if (IS_ERR(null))
goto err_free_skcipher;
ctx->auth = auth;
ctx->enc = enc;
ctx->null = null;
/*
* Allow enough space for two digests. The two digests will be compared
* during the decryption phase. One will come from the decrypted packet
* and the other will be calculated. For encryption, one digest is
* padded (up to a cipher blocksize) and chained with the payload
*/
ctx->reqoff = ALIGN(crypto_ahash_digestsize(auth) +
crypto_ahash_alignmask(auth),
crypto_ahash_alignmask(auth) + 1) +
max(crypto_ahash_digestsize(auth),
crypto_skcipher_blocksize(enc));
crypto_aead_set_reqsize(tfm,
sizeof(struct tls_request_ctx) +
ctx->reqoff +
max_t(unsigned int,
crypto_ahash_reqsize(auth) +
sizeof(struct ahash_request),
crypto_skcipher_reqsize(enc) +
sizeof(struct skcipher_request)));
return 0;
err_free_skcipher:
crypto_free_skcipher(enc);
err_free_ahash:
crypto_free_ahash(auth);
return err;
}
static void crypto_tls_exit_tfm(struct crypto_aead *tfm)
{
struct crypto_tls_ctx *ctx = crypto_aead_ctx(tfm);
crypto_free_ahash(ctx->auth);
crypto_free_skcipher(ctx->enc);
crypto_put_default_null_skcipher();
}
static void crypto_tls_free(struct aead_instance *inst)
{
struct tls_instance_ctx *ctx = aead_instance_ctx(inst);
crypto_drop_skcipher(&ctx->enc);
crypto_drop_ahash(&ctx->auth);
kfree(inst);
}
static int crypto_tls_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_attr_type *algt;
struct aead_instance *inst;
struct hash_alg_common *auth;
struct crypto_alg *auth_base;
struct skcipher_alg *enc;
struct tls_instance_ctx *ctx;
const char *enc_name;
int err;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
crypto_requires_sync(algt->type, algt->mask));
if (IS_ERR(auth))
return PTR_ERR(auth);
auth_base = &auth->base;
enc_name = crypto_attr_alg_name(tb[2]);
err = PTR_ERR(enc_name);
if (IS_ERR(enc_name))
goto out_put_auth;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
err = -ENOMEM;
if (!inst)
goto out_put_auth;
ctx = aead_instance_ctx(inst);
err = crypto_init_ahash_spawn(&ctx->auth, auth,
aead_crypto_instance(inst));
if (err)
goto err_free_inst;
crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
if (err)
goto err_drop_auth;
enc = crypto_spawn_skcipher_alg(&ctx->enc);
err = -ENAMETOOLONG;
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
"tls10(%s,%s)", auth_base->cra_name,
enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"tls10(%s,%s)", auth_base->cra_driver_name,
enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
inst->alg.base.cra_flags = (auth_base->cra_flags |
enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
auth_base->cra_priority;
inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
enc->base.cra_alignmask;
inst->alg.base.cra_ctxsize = sizeof(struct crypto_tls_ctx);
inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
inst->alg.maxauthsize = auth->digestsize;
inst->alg.init = crypto_tls_init_tfm;
inst->alg.exit = crypto_tls_exit_tfm;
inst->alg.setkey = crypto_tls_setkey;
inst->alg.encrypt = crypto_tls_encrypt;
inst->alg.decrypt = crypto_tls_decrypt;
inst->free = crypto_tls_free;
err = aead_register_instance(tmpl, inst);
if (err)
goto err_drop_enc;
out:
crypto_mod_put(auth_base);
return err;
err_drop_enc:
crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
crypto_drop_ahash(&ctx->auth);
err_free_inst:
kfree(inst);
out_put_auth:
goto out;
}
static struct crypto_template crypto_tls_tmpl = {
.name = "tls10",
.create = crypto_tls_create,
.module = THIS_MODULE,
};
static int __init crypto_tls_module_init(void)
{
return crypto_register_template(&crypto_tls_tmpl);
}
static void __exit crypto_tls_module_exit(void)
{
crypto_unregister_template(&crypto_tls_tmpl);
}
module_init(crypto_tls_module_init);
module_exit(crypto_tls_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TLS 1.0 record encryption");