qcacmn: Add changes to support crypto API

Add support for hash, hmac-hash calculation and
aead encryption and decryption.

Change-Id: Idddcfaa2ec4c5689c997559551230bc8f59df032
CRs-Fixed: 2029962

qdf/inc/qdf_crypto.h

@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ * DOC: qdf_crypto.h
+ * This file provides OS abstraction for crypto APIs.
+ */
+
+#if !defined(__QDF_CRYPTO_H)
+#define __QDF_CRYPTO_H
+
+/* Include Files */
+#include "qdf_status.h"
+#include <qdf_types.h>
+#include <qdf_trace.h>
+
+/* Preprocessor definitions and constants */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define AES_BLOCK_SIZE 16
+#define HMAC_SHA256_CRYPTO_TYPE "hmac(sha256)"
+#define HMAC_SHA386_CRYPTO_TYPE "hmac(sha384)"
+
+#define SHA256_CRYPTO_TYPE "sha256"
+#define SHA386_CRYPTO_TYPE "sha384"
+
+#define SHA256_DIGEST_SIZE 32
+#define SHA384_DIGEST_SIZE 48
+
+#define FIXED_PARAM_OFFSET_ASSOC_REQ 4
+#define FIXED_PARAM_OFFSET_ASSOC_RSP 6
+
+/* Function declarations and documenation */
+
+/**
+ * qdf_get_hash: API to get hash using specific crypto and scatterlist
+ * @type: crypto type
+ * @element_cnt: scatterlist element count
+ * @addr: scatterlist element array
+ * @addr_len: element length array
+ * @hash: new hash
+ *
+ * Return: 0 if success else error code
+ */
+int qdf_get_hash(uint8_t *type, uint8_t element_cnt,
+		uint8_t *addr[], uint32_t *addr_len,
+		int8_t *hash);
+
+/**
+ * qdf_get_hmac_hash: API to get hmac hash using specific crypto and
+ * scatterlist elements.
+ * @type: crypto type
+ * @key: key needs to be used for hmac api
+ * @keylen: length of key
+ * @element_cnt: scatterlist element count
+ * @addr: scatterlist element array
+ * @addr_len: element length array
+ * @hash: new hash
+ *
+ * Return: 0 if success else error code
+ */
+int qdf_get_hmac_hash(uint8_t *type, uint8_t *key,
+		uint32_t keylen, uint8_t element_cnt,
+		uint8_t *addr[], uint32_t *addr_len, int8_t *hash);
+
+/**
+ * qdf_get_keyed_hash: API to get hash using specific crypto and
+ * scatterlist elements.
+ * @type: crypto type
+ * @key: key needs to be used for hmac api
+ * @keylen: length of key
+ * @element_cnt: scatterlist element count
+ * @addr: scatterlist element array
+ * @addr_len: element length array
+ * @hash: new hash
+ *
+ * Return: 0 if success else error code
+ */
+int qdf_get_keyed_hash(const char *alg, const uint8_t *key,
+			unsigned int key_len, const uint8_t *src[],
+			size_t *src_len, size_t num_elements, uint8_t *out);
+/**
+ * qdf_update_dbl: This API does the doubling operation as defined in RFC5297
+ * @d: input for doubling
+ *
+ * Return: None
+ */
+void qdf_update_dbl(uint8_t *d);
+
+/**
+ * qdf_aes_s2v: This API gets vector from AES string as defined in RFC5297
+ * output length will be AES_BLOCK_SIZE.
+ * @key: key used for operation
+ * @key_len: key len
+ * @s: addresses of elements to be used
+ * @s_len: array of element length
+ * @num_s: number of elements
+ * @out: pointer to output vector
+ *
+ * Return: 0 if success else Error number
+ */
+int qdf_aes_s2v(const uint8_t *key, unsigned int key_len, const uint8_t *s[],
+		   size_t s_len[], size_t num_s, uint8_t *out);
+
+/**
+ * qdf_aes_ctr: This API defines AES Counter Mode
+ * @key: key used for operation
+ * @key_len: key len
+ * @siv: Initialization vector
+ * @src: input
+ * @src_len: input len
+ * @dest: output
+ * @enc: if encryption needs to be done or decryption
+ *
+ * Return: 0 if success else Error number
+ */
+int qdf_aes_ctr(const uint8_t *key, unsigned int key_len, uint8_t *siv,
+		const uint8_t *src, size_t src_len, uint8_t *dest, bool enc);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __QDF_CRYPTO_H */

qdf/linux/src/qdf_crypto.c

@@ -0,0 +1,321 @@
+/*
+ * Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ * DOC: qdf_crypto.c
+ *
+ * This source file contains linux specific definitions for QDF crypto APIs
+ */
+
+/* Include Files */
+#include "qdf_crypto.h"
+#include <linux/export.h>
+#include <crypto/hash.h>
+#include <crypto/aes.h>
+#include <crypto/skcipher.h>
+
+/* Function Definitions and Documentation */
+
+/*
+ * xor: API to calculate xor
+ * @a: first variable
+ * @b: second variable
+ * @len: length of variables
+ */
+static void xor(uint8_t *a, const uint8_t *b, size_t len)
+{
+	unsigned int i;
+
+	for (i = 0; i < len; i++)
+	a[i] ^= b[i];
+}
+
+int qdf_get_hash(uint8_t *type,
+		uint8_t element_cnt, uint8_t *addr[], uint32_t *addr_len,
+		int8_t *hash)
+{
+	int i, ret;
+	struct hash_desc desc;
+	struct scatterlist sg;
+
+	/* allocate crypto hash type */
+	desc.tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
+
+	if (IS_ERR(desc.tfm)) {
+		ret = PTR_ERR(desc.tfm);
+		return -EINVAL;
+	}
+	desc.flags = 0;
+	ret = crypto_hash_init(&desc);
+
+	if (ret)
+		return ret;
+
+	for (i = 0; i < element_cnt ; i++) {
+		sg_init_one(&sg, addr[i], addr_len[i]);
+		crypto_hash_update(&desc, &sg, addr_len[i]);
+	}
+
+	crypto_hash_final(&desc, hash);
+	crypto_free_hash(desc.tfm);
+	return 0;
+}
+
+int qdf_get_hmac_hash(uint8_t *type, uint8_t *key,
+		uint32_t keylen,
+		uint8_t element_cnt, uint8_t *addr[], uint32_t *addr_len,
+		int8_t *hash)
+{
+	int i, ret;
+	struct hash_desc desc;
+	struct scatterlist sg;
+
+	/* allocate crypto hash type */
+	desc.tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
+
+	if (IS_ERR(desc.tfm)) {
+		ret = PTR_ERR(desc.tfm);
+		return -EINVAL;
+	}
+	desc.flags = 0;
+	ret = crypto_hash_setkey(desc.tfm, key, keylen);
+
+	crypto_hash_init(&desc);
+
+	if (ret)
+		return ret;
+
+	for (i = 0; i < element_cnt ; i++) {
+		sg_init_one(&sg, addr[i], addr_len[i]);
+		crypto_hash_update(&desc, &sg, addr_len[i]);
+	}
+
+	crypto_hash_final(&desc, hash);
+	crypto_free_hash(desc.tfm);
+	return 0;
+}
+
+/* qdf_update_dbl from RFC 5297. Length of d is AES_BLOCK_SIZE (128 bits) */
+void qdf_update_dbl(uint8_t *d)
+{
+	int i;
+	uint8_t msb, msb_prev = 0;
+
+	/* left shift by 1 */
+	for (i = AES_BLOCK_SIZE - 1; i >= 0; i--) {
+		msb = d[i] & 0x80;
+		d[i] = d[i] << 1;
+		d[i] += msb_prev ? 1 : 0;
+		msb_prev = msb;
+	}
+
+	if (msb)
+		d[AES_BLOCK_SIZE - 1] ^= 0x87;
+}
+
+int qdf_get_keyed_hash(const char *alg, const uint8_t *key,
+			unsigned int key_len, const uint8_t *src[],
+			size_t *src_len, size_t num_elements, uint8_t *out)
+{
+	struct crypto_shash *tfm;
+	int ret;
+	size_t i;
+
+	tfm = crypto_alloc_shash(alg, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(tfm)) {
+		QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+			  FL("Failed to allocate transformation for %s: %ld"),
+			  alg, PTR_ERR(tfm));
+		return -EINVAL;
+	}
+
+	if (key && key_len) {
+		ret = crypto_shash_setkey(tfm, key, key_len);
+		if (ret) {
+			QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+				  FL("Set key failed for %s, ret:%d"),
+				  alg, -ret);
+			goto error;
+		}
+	}
+
+	do {
+		SHASH_DESC_ON_STACK(desc, tfm);
+		desc->tfm = tfm;
+		desc->flags = crypto_shash_get_flags(tfm);
+
+		ret = crypto_shash_init(desc);
+		if (ret) {
+			QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+				  FL("Failed to init hash for %s, ret:%d"),
+				  alg, -ret);
+			goto error;
+		}
+
+		for (i = 0; i < num_elements; i++) {
+			ret = crypto_shash_update(desc, src[i], src_len[i]);
+			if (ret) {
+				QDF_TRACE(QDF_MODULE_ID_QDF,
+					  QDF_TRACE_LEVEL_ERROR,
+					  FL("Failed to update hash for %s, ret:%d"),
+					  alg, -ret);
+				goto error;
+			}
+		}
+
+		ret = crypto_shash_final(desc, out);
+		if (ret)
+			QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+				  FL("Failed to get digest for %s, ret:%d"),
+				  alg, -ret);
+	} while (0);
+
+error:
+	crypto_free_shash(tfm);
+	return ret;
+}
+
+/* AES String to Vector from RFC 5297, 'out' should be of length AES_BLOCK_SIZE
+ */
+int qdf_aes_s2v(const uint8_t *key, unsigned int key_len, const uint8_t *s[],
+		   size_t s_len[], size_t num_s, uint8_t *out)
+{
+	const char *alg = "cmac(aes)";
+	uint8_t d[AES_BLOCK_SIZE];
+	uint8_t buf[AES_BLOCK_SIZE] = { 0 };
+	size_t buf_len = AES_BLOCK_SIZE;
+	const uint8_t *a[1];
+	unsigned int i;
+	uint8_t *t = NULL;
+	size_t t_len;
+	int ret;
+
+	if (num_s == 0) {
+		/* V = AES-CMAC(K, <one>) */
+		buf[0] = 0x01;
+		a[0] = buf;
+		ret = qdf_get_keyed_hash(alg, key, key_len, a, &buf_len, 1,
+					 out);
+		return ret;
+	}
+
+	/* D = AES-CMAC(K, <zero>) */
+	a[0] = buf;
+	ret = qdf_get_keyed_hash(alg, key, key_len, a, &buf_len, 1, d);
+	if (ret)
+		goto error;
+
+	for (i = 0; i < num_s - 1; i++) {
+		/* D = qdf_update_dbl(D) xor AES-CMAC(K, Si) */
+		qdf_update_dbl(d);
+		ret = qdf_get_keyed_hash(alg, key, key_len, &s[i], &s_len[i], 1,
+					 buf);
+		if (ret)
+			goto error;
+		xor(d, buf, AES_BLOCK_SIZE);
+	}
+
+	if (s_len[i] >= AES_BLOCK_SIZE) {
+		/* len(Sn) >= 128 */
+		/* T = Sn xorend D */
+		t = qdf_mem_malloc(s_len[i]);
+		if (!t)
+			return -EINVAL;
+		qdf_mem_copy(t, s[i], s_len[i]);
+		xor(t + s_len[i] - AES_BLOCK_SIZE, d, AES_BLOCK_SIZE);
+		t_len = s_len[i];
+	} else {
+		/* len(Sn) < 128 */
+		/* T = qdf_update_dbl(D) xor pad(Sn) */
+		qdf_update_dbl(d);
+		qdf_mem_set(buf, 0, AES_BLOCK_SIZE);
+		qdf_mem_copy(buf, s[i], s_len[i]);
+		buf[s_len[i]] = 0x80;
+		xor(d, s[i], AES_BLOCK_SIZE);
+		t = d;
+		t_len = AES_BLOCK_SIZE;
+	}
+
+	/* V = AES-CMAC(K, T) */
+	a[0] = t;
+	ret = qdf_get_keyed_hash(alg, key, key_len, a, &t_len, 1, out);
+
+error:
+	if (t != NULL && t != d)
+		qdf_mem_free(t);
+	return ret;
+}
+
+int qdf_aes_ctr(const uint8_t *key, unsigned int key_len, uint8_t *siv,
+		const uint8_t *src, size_t src_len, uint8_t *dest, bool enc)
+{
+	struct crypto_skcipher *tfm;
+	struct skcipher_request *req = NULL;
+	struct scatterlist sg_in, sg_out;
+	int ret;
+
+	if (key_len != 16 && key_len != 24 && key_len != 32) {
+		QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+			  FL("Invalid key length: %u"), key_len);
+		return -EINVAL;
+	}
+
+	tfm = crypto_alloc_skcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(tfm)) {
+		QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+			  FL("Failed to alloc transformation for ctr(aes):%ld"),
+			  PTR_ERR(tfm));
+		return -EAGAIN;
+	}
+
+	req = skcipher_request_alloc(tfm, GFP_KERNEL);
+	if (!req) {
+		QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+			  FL("Failed to allocate request for ctr(aes)"));
+		crypto_free_skcipher(tfm);
+		return -EAGAIN;
+	}
+
+	ret = crypto_skcipher_setkey(tfm, key, key_len);
+	if (ret) {
+		QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+			  FL("Set key failed for ctr(aes), ret:%d"), -ret);
+		skcipher_request_free(req);
+		crypto_free_skcipher(tfm);
+		return ret;
+	}
+
+	sg_init_one(&sg_in, src, src_len);
+	sg_init_one(&sg_out, dest, src_len);
+	skcipher_request_set_crypt(req, &sg_in, &sg_out, src_len, siv);
+
+	if (enc)
+		ret = crypto_skcipher_encrypt(req);
+	else
+		ret = crypto_skcipher_decrypt(req);
+
+	if (ret) {
+		QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_ERROR,
+			  FL("%s failed for ctr(aes), ret:%d"),
+			  enc ? "Encryption" : "Decryption", -ret);
+	}
+
+	skcipher_request_free(req);
+	crypto_free_skcipher(tfm);
+	return ret;
+}