diff options
Diffstat (limited to 'crypto')
-rw-r--r-- | crypto/Kconfig | 18 | ||||
-rw-r--r-- | crypto/Makefile | 3 | ||||
-rw-r--r-- | crypto/crypto_null.c | 6 | ||||
-rw-r--r-- | crypto/pkc.c | 67 | ||||
-rw-r--r-- | crypto/tcrypt.c | 16 | ||||
-rw-r--r-- | crypto/testmgr.c | 283 | ||||
-rw-r--r-- | crypto/testmgr.h | 412 | ||||
-rw-r--r-- | crypto/tls.c | 582 |
8 files changed, 1367 insertions, 20 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index 69ce573..2c6ef51 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -212,6 +212,24 @@ config CRYPTO_SEQIV This IV generator generates an IV based on a sequence number by xoring it with a salt. This algorithm is mainly useful for CTR +config CRYPTO_TLS + tristate "TLS support" + select CRYPTO_AEAD + select CRYPTO_BLKCIPHER + select CRYPTO_MANAGER + select CRYPTO_HASH + 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 diff --git a/crypto/Makefile b/crypto/Makefile index 80019ba..ab20a2e 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -15,7 +15,7 @@ obj-$(CONFIG_CRYPTO_ALGAPI2) += crypto_algapi.o obj-$(CONFIG_CRYPTO_AEAD2) += aead.o -crypto_blkcipher-y := ablkcipher.o +crypto_blkcipher-y := ablkcipher.o pkc.o crypto_blkcipher-y += blkcipher.o obj-$(CONFIG_CRYPTO_BLKCIPHER2) += crypto_blkcipher.o obj-$(CONFIG_CRYPTO_BLKCIPHER2) += chainiv.o @@ -85,6 +85,7 @@ obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o obj-$(CONFIG_CRYPTO_CRC32) += crc32.o obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif_common.o crct10dif_generic.o obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o +obj-$(CONFIG_CRYPTO_TLS) += tls.o obj-$(CONFIG_CRYPTO_LZO) += lzo.o obj-$(CONFIG_CRYPTO_LZ4) += lz4.o obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c index fee7265..1dc54bb 100644 --- a/crypto/crypto_null.c +++ b/crypto/crypto_null.c @@ -17,6 +17,7 @@ * */ +#include <crypto/null.h> #include <crypto/internal/hash.h> #include <crypto/internal/skcipher.h> #include <linux/init.h> @@ -24,11 +25,6 @@ #include <linux/mm.h> #include <linux/string.h> -#define NULL_KEY_SIZE 0 -#define NULL_BLOCK_SIZE 1 -#define NULL_DIGEST_SIZE 0 -#define NULL_IV_SIZE 0 - static int null_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { diff --git a/crypto/pkc.c b/crypto/pkc.c new file mode 100644 index 0000000..ada7eaf --- /dev/null +++ b/crypto/pkc.c @@ -0,0 +1,67 @@ +/* + * \file: pkc.c + * \brief: Public Key Cipher operations. + * + * This is the Public Key Cipher Implementation + * + * Author: Yashpal Dutta <yashpal.dutta@freescale.com> + * + * Copyright 2012 Freescale 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 <linux/cpumask.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/rtnetlink.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/seq_file.h> +#include <crypto/scatterwalk.h> +#include "internal.h" + +static unsigned int crypto_pkc_ctxsize(struct crypto_alg *alg, u32 type, + u32 mask) +{ + return alg->cra_ctxsize; +} + +static int crypto_init_pkc_ops(struct crypto_tfm *tfm, u32 type, u32 mask) +{ + struct pkc_alg *alg = &tfm->__crt_alg->cra_pkc; + struct pkc_tfm *crt = &tfm->crt_pkc; + + crt->pkc_op = alg->pkc_op; + crt->min_keysize = alg->min_keysize; + crt->max_keysize = alg->max_keysize; + crt->base = tfm; + + return 0; +} + +static void crypto_pkc_show(struct seq_file *m, struct crypto_alg *alg) +{ + struct pkc_alg *pkc_alg = &alg->cra_pkc; + + seq_printf(m, "type : pkc_cipher\n"); + seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? + "yes" : "no"); + seq_printf(m, "min keysize : %u\n", pkc_alg->min_keysize); + seq_printf(m, "max keysize : %u\n", pkc_alg->max_keysize); +} + +const struct crypto_type crypto_pkc_type = { + .ctxsize = crypto_pkc_ctxsize, + .init = crypto_init_pkc_ops, +#ifdef CONFIG_PROC_FS + .show = crypto_pkc_show, +#endif +}; +EXPORT_SYMBOL_GPL(crypto_pkc_type); diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c index 25a5934..93ad770 100644 --- a/crypto/tcrypt.c +++ b/crypto/tcrypt.c @@ -1242,6 +1242,22 @@ static int do_test(int m) ret += tcrypt_test("cmac(des3_ede)"); break; + case 155: + ret += tcrypt_test("authenc(hmac(sha1),cbc(aes))"); + break; + + case 156: + ret += tcrypt_test("authenc(hmac(md5),ecb(cipher_null))"); + break; + + case 157: + ret += tcrypt_test("authenc(hmac(sha1),ecb(cipher_null))"); + break; + + case 180: + 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); diff --git a/crypto/testmgr.c b/crypto/testmgr.c index e091ef6..ee27673 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -108,6 +108,13 @@ struct cprng_test_suite { unsigned int count; }; +struct tls_test_suite { + struct { + struct tls_testvec *vecs; + unsigned int count; + } enc, dec; +}; + struct alg_test_desc { const char *alg; int (*test)(const struct alg_test_desc *desc, const char *driver, @@ -121,6 +128,7 @@ struct alg_test_desc { struct pcomp_test_suite pcomp; struct hash_test_suite hash; struct cprng_test_suite cprng; + struct tls_test_suite tls; } suite; }; @@ -503,16 +511,16 @@ static int __test_aead(struct crypto_aead *tfm, int enc, goto out; } - sg_init_one(&sg[0], input, - template[i].ilen + (enc ? authsize : 0)); - if (diff_dst) { output = xoutbuf[0]; output += align_offset; + sg_init_one(&sg[0], input, template[i].ilen); sg_init_one(&sgout[0], output, + template[i].rlen); + } else { + sg_init_one(&sg[0], input, template[i].ilen + (enc ? authsize : 0)); - } else { output = input; } @@ -612,12 +620,6 @@ static int __test_aead(struct crypto_aead *tfm, int enc, memcpy(q, template[i].input + temp, template[i].tap[k]); - n = template[i].tap[k]; - if (k == template[i].np - 1 && enc) - n += authsize; - if (offset_in_page(q) + n < PAGE_SIZE) - q[n] = 0; - sg_set_buf(&sg[k], q, template[i].tap[k]); if (diff_dst) { @@ -625,13 +627,17 @@ static int __test_aead(struct crypto_aead *tfm, int enc, offset_in_page(IDX[k]); memset(q, 0, template[i].tap[k]); - if (offset_in_page(q) + n < PAGE_SIZE) - q[n] = 0; sg_set_buf(&sgout[k], q, template[i].tap[k]); } + n = template[i].tap[k]; + if (k == template[i].np - 1 && enc) + n += authsize; + if (offset_in_page(q) + n < PAGE_SIZE) + q[n] = 0; + temp += template[i].tap[k]; } @@ -650,10 +656,10 @@ static int __test_aead(struct crypto_aead *tfm, int enc, goto out; } - sg[k - 1].length += authsize; - if (diff_dst) sgout[k - 1].length += authsize; + else + sg[k - 1].length += authsize; } sg_init_table(asg, template[i].anp); @@ -805,6 +811,208 @@ static int test_aead(struct crypto_aead *tfm, 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, rlen; + int ret = -ENOMEM; + char *q; + char *key; + struct aead_request *req; + struct scatterlist *sg; + struct scatterlist *asg; + struct scatterlist *sgout; + const char *e, *d; + struct tcrypt_result result; + void *input; + void *output; + void *assoc; + char iv[MAX_IVLEN]; + char *xbuf[XBUFSIZE]; + char *xoutbuf[XBUFSIZE]; + char *axbuf[XBUFSIZE]; + + if (testmgr_alloc_buf(xbuf)) + goto out_noxbuf; + if (testmgr_alloc_buf(axbuf)) + goto out_noaxbuf; + + if (diff_dst && testmgr_alloc_buf(xoutbuf)) + goto out_nooutbuf; + + sg = kmalloc(sizeof(*sg) * 8 * (diff_dst ? 3 : 2), GFP_KERNEL); + if (!sg) + goto out_nosg; + + asg = sg + 8; + sgout = sg + 16; + + d = diff_dst ? "-ddst" : ""; + e = enc ? "encryption" : "decryption"; + + init_completion(&result.completion); + 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, + tcrypt_complete, &result); + + 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(input, template[i].input, template[i].ilen); + memcpy(assoc, template[i].assoc, template[i].alen); + if (template[i].iv) + memcpy(iv, template[i].iv, MAX_IVLEN); + else + memset(iv, 0, MAX_IVLEN); + + crypto_aead_clear_flags(tfm, ~0); + key = template[i].key; + + 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; + } + if (ret) + continue; + + /* Allocate enough space in the input and output scatterlists. + * They must accomodate the result for in-place encryption and + * different-place decryption + */ + rlen = max(template[i].ilen, template[i].rlen); + if (diff_dst) { + output = xoutbuf[0]; + sg_init_one(&sg[0], input, template[i].ilen); + sg_init_one(&sgout[0], output, rlen); + } else { + output = input; + sg_init_one(&sg[0], input, rlen); + } + + sg_init_one(&asg[0], assoc, template[i].alen); + aead_request_set_assoc(req, asg, template[i].alen); + aead_request_set_crypt(req, sg, (diff_dst) ? sgout : sg, + template[i].ilen, iv); + + ret = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); + + 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 -EINPROGRESS: + case -EBUSY: + /* The result is not ready yet. We wait for it and then + * check if the request succeeded or not + */ + ret = wait_for_completion_interruptible( + &result.completion); + if (!ret && !result.err) { + reinit_completion(&result.completion); + break; + } else { + ret = result.err; + } + /* fall through */ + 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: + if (diff_dst) + testmgr_free_buf(xoutbuf); +out_nooutbuf: + testmgr_free_buf(axbuf); +out_noaxbuf: + 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 test_cipher(struct crypto_cipher *tfm, int enc, struct cipher_testvec *template, unsigned int tcount) { @@ -1811,6 +2019,22 @@ static const struct alg_test_desc alg_test_descs[] = { } } }, { + .alg = "authenc(hmac(md5),ecb(cipher_null))", + .test = alg_test_aead, + .fips_allowed = 1, + .suite = { + .aead = { + .enc = { + .vecs = hmac_md5_ecb_cipher_null_enc_tv_template, + .count = HMAC_MD5_ECB_CIPHER_NULL_ENC_TEST_VECTORS + }, + .dec = { + .vecs = hmac_md5_ecb_cipher_null_dec_tv_template, + .count = HMAC_MD5_ECB_CIPHER_NULL_DEC_TEST_VECTORS + } + } + } + }, { .alg = "authenc(hmac(sha1),cbc(aes))", .test = alg_test_aead, .fips_allowed = 1, @@ -1823,6 +2047,22 @@ static const struct alg_test_desc alg_test_descs[] = { } } }, { + .alg = "authenc(hmac(sha1),ecb(cipher_null))", + .test = alg_test_aead, + .fips_allowed = 1, + .suite = { + .aead = { + .enc = { + .vecs = hmac_sha1_ecb_cipher_null_enc_tv_template, + .count = HMAC_SHA1_ECB_CIPHER_NULL_ENC_TEST_VECTORS + }, + .dec = { + .vecs = hmac_sha1_ecb_cipher_null_dec_tv_template, + .count = HMAC_SHA1_ECB_CIPHER_NULL_DEC_TEST_VECTORS + } + } + } + }, { .alg = "authenc(hmac(sha256),cbc(aes))", .test = alg_test_aead, .fips_allowed = 1, @@ -3002,6 +3242,21 @@ static const struct alg_test_desc alg_test_descs[] = { } } }, { + .alg = "tls10(hmac(sha1),cbc(aes))", + .test = alg_test_tls, + .suite = { + .tls = { + .enc = { + .vecs = tls_enc_tv_template, + .count = TLS_ENC_TEST_VECTORS + }, + .dec = { + .vecs = tls_dec_tv_template, + .count = TLS_DEC_TEST_VECTORS + } + } + } + }, { .alg = "vmac(aes)", .test = alg_test_hash, .suite = { diff --git a/crypto/testmgr.h b/crypto/testmgr.h index 7d44aa3..7bdadcc 100644 --- a/crypto/testmgr.h +++ b/crypto/testmgr.h @@ -92,8 +92,240 @@ struct cprng_testvec { unsigned short loops; }; +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 */ +}; + static char zeroed_string[48]; + +/* + * TLS1.0 synthetic test vectors + */ +#define TLS_ENC_TEST_VECTORS 3 +#define TLS_DEC_TEST_VECTORS 3 + +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 */ + "authenticationkey20b" + "enckeyis16_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 */ + "authenticationkey20b" + "enckeyis16_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 */ + "authenticationkey20b" + "enckeyis16_bytes", + .klen = 8 + 20 + 16, + .iv = "iv0123456789abcd", + .input = "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 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 */ + "authenticationkey20b" + "enckeyis16_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 */ + "authenticationkey20b" + "enckeyis16_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 */ + "authenticationkey20b" + "enckeyis16_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 plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext285 bytes plaintext" + "285 bytes plaintext", + .rlen = 285, + } +}; + /* * MD4 test vectors from RFC1320 */ @@ -12821,6 +13053,10 @@ static struct cipher_testvec cast6_xts_dec_tv_template[] = { #define AES_DEC_TEST_VECTORS 4 #define AES_CBC_ENC_TEST_VECTORS 5 #define AES_CBC_DEC_TEST_VECTORS 5 +#define HMAC_MD5_ECB_CIPHER_NULL_ENC_TEST_VECTORS 2 +#define HMAC_MD5_ECB_CIPHER_NULL_DEC_TEST_VECTORS 2 +#define HMAC_SHA1_ECB_CIPHER_NULL_ENC_TEST_VECTORS 2 +#define HMAC_SHA1_ECB_CIPHER_NULL_DEC_TEST_VECTORS 2 #define HMAC_SHA1_AES_CBC_ENC_TEST_VECTORS 7 #define HMAC_SHA256_AES_CBC_ENC_TEST_VECTORS 7 #define HMAC_SHA512_AES_CBC_ENC_TEST_VECTORS 7 @@ -13627,6 +13863,90 @@ static struct cipher_testvec aes_cbc_dec_tv_template[] = { }, }; +static struct aead_testvec hmac_md5_ecb_cipher_null_enc_tv_template[] = { + { /* Input data from RFC 2410 Case 1 */ +#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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00", + .klen = 8 + 16 + 0, + .iv = "", + .input = "\x01\x23\x45\x67\x89\xab\xcd\xef", + .ilen = 8, + .result = "\x01\x23\x45\x67\x89\xab\xcd\xef" + "\xaa\x42\xfe\x43\x8d\xea\xa3\x5a" + "\xb9\x3d\x9f\xb1\xa3\x8e\x9b\xae", + .rlen = 8 + 16, + }, { /* Input data from RFC 2410 Case 2 */ +#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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00", + .klen = 8 + 16 + 0, + .iv = "", + .input = "Network Security People Have A Strange Sense Of Humor", + .ilen = 53, + .result = "Network Security People Have A Strange Sense Of Humor" + "\x73\xa5\x3e\x1c\x08\x0e\x8a\x8a" + "\x8e\xb5\x5f\x90\x8e\xfe\x13\x23", + .rlen = 53 + 16, + }, +}; + +static struct aead_testvec hmac_md5_ecb_cipher_null_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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00", + .klen = 8 + 16 + 0, + .iv = "", + .input = "\x01\x23\x45\x67\x89\xab\xcd\xef" + "\xaa\x42\xfe\x43\x8d\xea\xa3\x5a" + "\xb9\x3d\x9f\xb1\xa3\x8e\x9b\xae", + .ilen = 8 + 16, + .result = "\x01\x23\x45\x67\x89\xab\xcd\xef", + .rlen = 8, + }, { +#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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00", + .klen = 8 + 16 + 0, + .iv = "", + .input = "Network Security People Have A Strange Sense Of Humor" + "\x73\xa5\x3e\x1c\x08\x0e\x8a\x8a" + "\x8e\xb5\x5f\x90\x8e\xfe\x13\x23", + .ilen = 53 + 16, + .result = "Network Security People Have A Strange Sense Of Humor", + .rlen = 53, + }, +}; + static struct aead_testvec hmac_sha1_aes_cbc_enc_tv_template[] = { { /* RFC 3602 Case 1 */ #ifdef __LITTLE_ENDIAN @@ -13876,6 +14196,98 @@ static struct aead_testvec hmac_sha1_aes_cbc_enc_tv_template[] = { }, }; +static struct aead_testvec hmac_sha1_ecb_cipher_null_enc_tv_template[] = { + { /* Input data from RFC 2410 Case 1 */ +#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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00", + .klen = 8 + 20 + 0, + .iv = "", + .input = "\x01\x23\x45\x67\x89\xab\xcd\xef", + .ilen = 8, + .result = "\x01\x23\x45\x67\x89\xab\xcd\xef" + "\x40\xc3\x0a\xa1\xc9\xa0\x28\xab" + "\x99\x5e\x19\x04\xd1\x72\xef\xb8" + "\x8c\x5e\xe4\x08", + .rlen = 8 + 20, + }, { /* Input data from RFC 2410 Case 2 */ +#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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00", + .klen = 8 + 20 + 0, + .iv = "", + .input = "Network Security People Have A Strange Sense Of Humor", + .ilen = 53, + .result = "Network Security People Have A Strange Sense Of Humor" + "\x75\x6f\x42\x1e\xf8\x50\x21\xd2" + "\x65\x47\xee\x8e\x1a\xef\x16\xf6" + "\x91\x56\xe4\xd6", + .rlen = 53 + 20, + }, +}; + +static struct aead_testvec hmac_sha1_ecb_cipher_null_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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00", + .klen = 8 + 20 + 0, + .iv = "", + .input = "\x01\x23\x45\x67\x89\xab\xcd\xef" + "\x40\xc3\x0a\xa1\xc9\xa0\x28\xab" + "\x99\x5e\x19\x04\xd1\x72\xef\xb8" + "\x8c\x5e\xe4\x08", + .ilen = 8 + 20, + .result = "\x01\x23\x45\x67\x89\xab\xcd\xef", + .rlen = 8, + }, { +#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\x00" /* enc key length */ + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00\x00\x00\x00", + .klen = 8 + 20 + 0, + .iv = "", + .input = "Network Security People Have A Strange Sense Of Humor" + "\x75\x6f\x42\x1e\xf8\x50\x21\xd2" + "\x65\x47\xee\x8e\x1a\xef\x16\xf6" + "\x91\x56\xe4\xd6", + .ilen = 53 + 20, + .result = "Network Security People Have A Strange Sense Of Humor", + .rlen = 53, + }, +}; + static struct aead_testvec hmac_sha256_aes_cbc_enc_tv_template[] = { { /* RFC 3602 Case 1 */ #ifdef __LITTLE_ENDIAN diff --git a/crypto/tls.c b/crypto/tls.c new file mode 100644 index 0000000..38cd1ba --- /dev/null +++ b/crypto/tls.c @@ -0,0 +1,582 @@ +/* + * Copyright 2013 Freescale 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/aead.h> +#include <crypto/internal/hash.h> +#include <crypto/internal/skcipher.h> +#include <crypto/authenc.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_ablkcipher *enc; +}; + +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 icv[2]; + struct scatterlist cipher[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) +{ + unsigned int authkeylen; + unsigned int enckeylen; + struct crypto_tls_ctx *ctx = crypto_aead_ctx(tls); + struct crypto_ahash *auth = ctx->auth; + struct crypto_ablkcipher *enc = ctx->enc; + struct rtattr *rta = (void *)key; + struct crypto_authenc_key_param *param; + int err = -EINVAL; + + if (!RTA_OK(rta, keylen)) + goto badkey; + if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) + goto badkey; + if (RTA_PAYLOAD(rta) < sizeof(*param)) + goto badkey; + + param = RTA_DATA(rta); + enckeylen = be32_to_cpu(param->enckeylen); + + key += RTA_ALIGN(rta->rta_len); + keylen -= RTA_ALIGN(rta->rta_len); + + if (keylen < enckeylen) + goto badkey; + + authkeylen = keylen - enckeylen; + + 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, key, authkeylen); + crypto_aead_set_flags(tls, crypto_ahash_get_flags(auth) & + CRYPTO_TFM_RES_MASK); + + if (err) + goto out; + + crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); + crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(tls) & + CRYPTO_TFM_REQ_MASK); + err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen); + crypto_aead_set_flags(tls, crypto_ablkcipher_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 payload data + * @srclen: (input) size of the payload data + * @req: (input) aead request (with pointers to associated data) + **/ +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 scatterlist *assoc = req->assoc; + struct scatterlist *icv = treq_ctx->icv; + 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 as we have only two maneuvering scatterlists in icv. Check + * also if the request assoc len matches the scatterlist len + */ + if (!req->assoclen || !sg_is_last(assoc) || + req->assoclen != assoc->length) + return err; + + /* + * Prepend associated data to the source scatterlist. If the source is + * empty, use directly the associated data scatterlist + */ + if (srclen) { + sg_init_table(icv, 2); + sg_set_page(icv, sg_page(assoc), assoc->length, assoc->offset); + scatterwalk_sg_chain(icv, 2, src); + } else { + icv = assoc; + } + srclen += assoc->length; + + 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, icv, 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 padlen; + int err; + + err = crypto_tls_genicv(hash, req->src, req->cryptlen, 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_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); + + unsigned int cryptlen, phashlen; + struct scatterlist *cipher = treq_ctx->cipher; + struct scatterlist *sg, *src_last = NULL; + int err; + /* + * The hash and the cipher are applied at different times and their + * requests can use the same memory space without interference + */ + struct ablkcipher_request *abreq = (void *)(treq_ctx->tail + + ctx->reqoff); + /* + * The hash result is saved at the beginning of the tls request and is + * aligned as required by the hash transform. Enough space was + * allocated in crypto_tls_init_tfm to accomodate the difference. The + * requests themselves start later at treq_ctx->tail + ctx->reqoff so + * the result is not overwritten by the second (cipher) request + */ + u8 *hash = treq_ctx->tail; + 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. + * + * For same-destination, hash is copied directly after the + * payload since the buffers must have enough space for encryption. + * For different destination there are several casess to check. + * 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->src == req->dst) { + scatterwalk_map_and_copy(hash, req->src, req->cryptlen, + phashlen, 1); + } else { + if (req->cryptlen) { + sg_init_table(cipher, 2); + sg_set_buf(cipher + 1, hash, phashlen); + if (sg_is_last(req->src)) { + sg_set_page(cipher, sg_page(req->src), + req->src->length, req->src->offset); + req->src = cipher; + } else { + for (sg = req->src; sg; sg = sg_next(sg)) + src_last = sg; + sg_set_page(cipher, sg_page(src_last), + src_last->length, src_last->offset); + scatterwalk_sg_chain(src_last, 1, cipher); + } + } else { + sg_init_one(req->src, hash, phashlen); + } + } + + /* + * STEP 3: encrypt the frame and return the result + */ + cryptlen = req->cryptlen + phashlen; + ablkcipher_request_set_tfm(abreq, ctx->enc); + ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, + req->iv); + /* set the callback for encryption request termination */ + ablkcipher_request_set_callback(abreq, 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_ablkcipher_encrypt(abreq); + + 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); + struct scatterlist *assoc = req->assoc; + unsigned int cryptlen = req->cryptlen; + unsigned int hash_size = crypto_aead_authsize(tls); + unsigned int block_size = crypto_aead_blocksize(tls); + struct ablkcipher_request *abreq = (void *)(treq_ctx->tail + + ctx->reqoff); + 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 + */ + init_completion(&ciph_op.completion); + + ablkcipher_request_set_tfm(abreq, ctx->enc); + ablkcipher_request_set_callback(abreq, aead_request_flags(req), + tls_async_op_done, &ciph_op); + ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, + req->iv); + err = crypto_ablkcipher_decrypt(abreq); + 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, req->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, req->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(assoc) + assoc->length - 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, req->dst, cryptlen, hash_size, 0); + + /* Now compute and compare our ICV with the one from the packet */ + err = crypto_tls_genicv(hash, req->dst, cryptlen, req); + if (!err) + err = memcmp(hash, ihash, hash_size) ? -EBADMSG : 0; + + /* 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_tfm *tfm) +{ + struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); + struct tls_instance_ctx *ictx = crypto_instance_ctx(inst); + struct crypto_tls_ctx *ctx = crypto_tfm_ctx(tfm); + struct crypto_ahash *auth; + struct crypto_ablkcipher *enc; + 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; + + ctx->auth = auth; + ctx->enc = enc; + /* + * 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_ablkcipher_blocksize(enc)); + + tfm->crt_aead.reqsize = sizeof(struct tls_request_ctx) + ctx->reqoff + + max_t(unsigned int, + crypto_ahash_reqsize(auth) + + sizeof(struct ahash_request), + crypto_ablkcipher_reqsize(enc) + + sizeof(struct ablkcipher_request)); + + return 0; + +err_free_ahash: + crypto_free_ahash(auth); + return err; +} + +static void crypto_tls_exit_tfm(struct crypto_tfm *tfm) +{ + struct crypto_tls_ctx *ctx = crypto_tfm_ctx(tfm); + + crypto_free_ahash(ctx->auth); + crypto_free_ablkcipher(ctx->enc); +} + +static struct crypto_instance *crypto_tls_alloc(struct rtattr **tb) +{ + struct crypto_attr_type *algt; + struct crypto_instance *inst; + struct hash_alg_common *auth; + struct crypto_alg *auth_base; + struct crypto_alg *enc; + struct tls_instance_ctx *ctx; + const char *enc_name; + int err; + + algt = crypto_get_attr_type(tb); + err = PTR_ERR(algt); + if (IS_ERR(algt)) + return ERR_PTR(err); + + if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) + return ERR_PTR(-EINVAL); + + auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, + CRYPTO_ALG_TYPE_AHASH_MASK); + if (IS_ERR(auth)) + return ERR_CAST(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 = crypto_instance_ctx(inst); + + err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); + if (err) + goto err_free_inst; + + crypto_set_skcipher_spawn(&ctx->enc, 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_skcipher_spawn_alg(&ctx->enc); + + err = -ENAMETOOLONG; + if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, + "tls10(%s,%s)", auth_base->cra_name, enc->cra_name) >= + CRYPTO_MAX_ALG_NAME) + goto err_drop_enc; + + if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, + "tls10(%s,%s)", auth_base->cra_driver_name, + enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + goto err_drop_enc; + + inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; + inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; + /* priority calculation is taken from authenc.c */ + inst->alg.cra_priority = enc->cra_priority * 10 + + auth_base->cra_priority; + inst->alg.cra_blocksize = enc->cra_blocksize; + inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; + inst->alg.cra_type = &crypto_aead_type; + + inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; + inst->alg.cra_aead.maxauthsize = auth->digestsize; + + inst->alg.cra_ctxsize = sizeof(struct crypto_tls_ctx); + + inst->alg.cra_init = crypto_tls_init_tfm; + inst->alg.cra_exit = crypto_tls_exit_tfm; + + inst->alg.cra_aead.setkey = crypto_tls_setkey; + inst->alg.cra_aead.encrypt = crypto_tls_encrypt; + inst->alg.cra_aead.decrypt = crypto_tls_decrypt; + +out: + crypto_mod_put(auth_base); + return inst; + +err_drop_enc: + crypto_drop_skcipher(&ctx->enc); +err_drop_auth: + crypto_drop_ahash(&ctx->auth); +err_free_inst: + kfree(inst); +out_put_auth: + inst = ERR_PTR(err); + goto out; +} + +static void crypto_tls_free(struct crypto_instance *inst) +{ + struct tls_instance_ctx *ctx = crypto_instance_ctx(inst); + + crypto_drop_skcipher(&ctx->enc); + crypto_drop_ahash(&ctx->auth); + kfree(inst); +} + +static struct crypto_template crypto_tls_tmpl = { + .name = "tls10", + .alloc = crypto_tls_alloc, + .free = crypto_tls_free, + .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"); |