[linux-2.6-block.git] / fs / ceph / crypto.c


#include "ceph_debug.h"

#include <linux/err.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <crypto/hash.h>

#include "crypto.h"
#include "decode.h"

int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end)
{
	if (*p + sizeof(u16) + sizeof(key->created) +
	    sizeof(u16) + key->len > end)
		return -ERANGE;
	ceph_encode_16(p, key->type);
	ceph_encode_copy(p, &key->created, sizeof(key->created));
	ceph_encode_16(p, key->len);
	ceph_encode_copy(p, key->key, key->len);
	return 0;
}

int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
{
	ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
	key->type = ceph_decode_16(p);
	ceph_decode_copy(p, &key->created, sizeof(key->created));
	key->len = ceph_decode_16(p);
	ceph_decode_need(p, end, key->len, bad);
	key->key = kmalloc(key->len, GFP_NOFS);
	if (!key->key)
		return -ENOMEM;
	ceph_decode_copy(p, key->key, key->len);
	return 0;

bad:
	dout("failed to decode crypto key\n");
	return -EINVAL;
}

int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
{
	int inlen = strlen(inkey);
	int blen = inlen * 3 / 4;
	void *buf, *p;
	int ret;

	dout("crypto_key_unarmor %s\n", inkey);
	buf = kmalloc(blen, GFP_NOFS);
	if (!buf)
		return -ENOMEM;
	blen = ceph_unarmor(buf, inkey, inkey+inlen);
	if (blen < 0) {
		kfree(buf);
		return blen;
	}

	p = buf;
	ret = ceph_crypto_key_decode(key, &p, p + blen);
	kfree(buf);
	if (ret)
		return ret;
	dout("crypto_key_unarmor key %p type %d len %d\n", key,
	     key->type, key->len);
	return 0;
}


#define AES_KEY_SIZE 16

static struct crypto_blkcipher *ceph_crypto_alloc_cipher(void)
{
	return crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
}

const u8 *aes_iv = "cephsageyudagreg";

int ceph_aes_encrypt(const void *key, int key_len, void *dst, size_t *dst_len,
		     const void *src, size_t src_len)
{
	struct scatterlist sg_in[2], sg_out[1];
	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
	struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
	int ret;
	void *iv;
	int ivsize;
	size_t zero_padding = (0x10 - (src_len & 0x0f));
	char pad[16];

	if (IS_ERR(tfm))
		return PTR_ERR(tfm);

	memset(pad, zero_padding, zero_padding);

	*dst_len = src_len + zero_padding;

	crypto_blkcipher_setkey((void *)tfm, key, key_len);
	sg_init_table(sg_in, 2);
	sg_set_buf(&sg_in[0], src, src_len);
	sg_set_buf(&sg_in[1], pad, zero_padding);
	sg_init_table(sg_out, 1);
	sg_set_buf(sg_out, dst, *dst_len);
	iv = crypto_blkcipher_crt(tfm)->iv;
	ivsize = crypto_blkcipher_ivsize(tfm);

	memcpy(iv, aes_iv, ivsize);
	/*
	print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
		       key, key_len, 1);
	print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1,
			src, src_len, 1);
	print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
			pad, zero_padding, 1);
	*/
	ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
				     src_len + zero_padding);
	crypto_free_blkcipher(tfm);
	if (ret < 0)
		pr_err("ceph_aes_crypt failed %d\n", ret);
	/*
	print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
		       dst, *dst_len, 1);
	*/
	return 0;
}

int ceph_aes_encrypt2(const void *key, int key_len, void *dst, size_t *dst_len,
		      const void *src1, size_t src1_len,
		      const void *src2, size_t src2_len)
{
	struct scatterlist sg_in[3], sg_out[1];
	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
	struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
	int ret;
	void *iv;
	int ivsize;
	size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f));
	char pad[16];

	if (IS_ERR(tfm))
		return PTR_ERR(tfm);

	memset(pad, zero_padding, zero_padding);

	*dst_len = src1_len + src2_len + zero_padding;

	crypto_blkcipher_setkey((void *)tfm, key, key_len);
	sg_init_table(sg_in, 3);
	sg_set_buf(&sg_in[0], src1, src1_len);
	sg_set_buf(&sg_in[1], src2, src2_len);
	sg_set_buf(&sg_in[2], pad, zero_padding);
	sg_init_table(sg_out, 1);
	sg_set_buf(sg_out, dst, *dst_len);
	iv = crypto_blkcipher_crt(tfm)->iv;
	ivsize = crypto_blkcipher_ivsize(tfm);

	memcpy(iv, aes_iv, ivsize);
	/*
	print_hex_dump(KERN_ERR, "enc  key: ", DUMP_PREFIX_NONE, 16, 1,
		       key, key_len, 1);
	print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1,
			src1, src1_len, 1);
	print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1,
			src2, src2_len, 1);
	print_hex_dump(KERN_ERR, "enc  pad: ", DUMP_PREFIX_NONE, 16, 1,
			pad, zero_padding, 1);
	*/
	ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
				     src1_len + src2_len + zero_padding);
	crypto_free_blkcipher(tfm);
	if (ret < 0)
		pr_err("ceph_aes_crypt2 failed %d\n", ret);
	/*
	print_hex_dump(KERN_ERR, "enc  out: ", DUMP_PREFIX_NONE, 16, 1,
		       dst, *dst_len, 1);
	*/
	return 0;
}

int ceph_aes_decrypt(const void *key, int key_len, void *dst, size_t *dst_len,
		     const void *src, size_t src_len)
{
	struct scatterlist sg_in[1], sg_out[2];
	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
	struct blkcipher_desc desc = { .tfm = tfm };
	char pad[16];
	void *iv;
	int ivsize;
	int ret;
	int last_byte;

	if (IS_ERR(tfm))
		return PTR_ERR(tfm);

	crypto_blkcipher_setkey((void *)tfm, key, key_len);
	sg_init_table(sg_in, 1);
	sg_init_table(sg_out, 2);
	sg_set_buf(sg_in, src, src_len);
	sg_set_buf(&sg_out[0], dst, *dst_len);
	sg_set_buf(&sg_out[1], pad, sizeof(pad));

	iv = crypto_blkcipher_crt(tfm)->iv;
	ivsize = crypto_blkcipher_ivsize(tfm);

	memcpy(iv, aes_iv, ivsize);

	/*
	print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
		       key, key_len, 1);
	print_hex_dump(KERN_ERR, "dec  in: ", DUMP_PREFIX_NONE, 16, 1,
		       src, src_len, 1);
	*/

	ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
	crypto_free_blkcipher(tfm);
	if (ret < 0) {
		pr_err("ceph_aes_decrypt failed %d\n", ret);
		return ret;
	}

	if (src_len <= *dst_len)
		last_byte = ((char *)dst)[src_len - 1];
	else
		last_byte = pad[src_len - *dst_len - 1];
	if (last_byte <= 16 && src_len >= last_byte) {
		*dst_len = src_len - last_byte;
	} else {
		pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
		       last_byte, (int)src_len);
		return -EPERM;  /* bad padding */
	}
	/*
	print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1,
		       dst, *dst_len, 1);
	*/
	return 0;
}

int ceph_aes_decrypt2(const void *key, int key_len,
		      void *dst1, size_t *dst1_len,
		      void *dst2, size_t *dst2_len,
		      const void *src, size_t src_len)
{
	struct scatterlist sg_in[1], sg_out[3];
	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
	struct blkcipher_desc desc = { .tfm = tfm };
	char pad[16];
	void *iv;
	int ivsize;
	int ret;
	int last_byte;

	if (IS_ERR(tfm))
		return PTR_ERR(tfm);

	sg_init_table(sg_in, 1);
	sg_set_buf(sg_in, src, src_len);
	sg_init_table(sg_out, 3);
	sg_set_buf(&sg_out[0], dst1, *dst1_len);
	sg_set_buf(&sg_out[1], dst2, *dst2_len);
	sg_set_buf(&sg_out[2], pad, sizeof(pad));

	crypto_blkcipher_setkey((void *)tfm, key, key_len);
	iv = crypto_blkcipher_crt(tfm)->iv;
	ivsize = crypto_blkcipher_ivsize(tfm);

	memcpy(iv, aes_iv, ivsize);

	/*
	print_hex_dump(KERN_ERR, "dec  key: ", DUMP_PREFIX_NONE, 16, 1,
		       key, key_len, 1);
	print_hex_dump(KERN_ERR, "dec   in: ", DUMP_PREFIX_NONE, 16, 1,
		       src, src_len, 1);
	*/

	ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
	crypto_free_blkcipher(tfm);
	if (ret < 0) {
		pr_err("ceph_aes_decrypt failed %d\n", ret);
		return ret;
	}

	if (src_len <= *dst1_len)
		last_byte = ((char *)dst1)[src_len - 1];
	else if (src_len <= *dst1_len + *dst2_len)
		last_byte = ((char *)dst2)[src_len - *dst1_len - 1];
	else
		last_byte = pad[src_len - *dst1_len - *dst2_len - 1];
	if (last_byte <= 16 && src_len >= last_byte) {
		src_len -= last_byte;
	} else {
		pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
		       last_byte, (int)src_len);
		return -EPERM;  /* bad padding */
	}

	if (src_len < *dst1_len) {
		*dst1_len = src_len;
		*dst2_len = 0;
	} else {
		*dst2_len = src_len - *dst1_len;
	}
	/*
	print_hex_dump(KERN_ERR, "dec  out1: ", DUMP_PREFIX_NONE, 16, 1,
		       dst1, *dst1_len, 1);
	print_hex_dump(KERN_ERR, "dec  out2: ", DUMP_PREFIX_NONE, 16, 1,
		       dst2, *dst2_len, 1);
	*/

	return 0;
}


int ceph_decrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
		 const void *src, size_t src_len)
{
	switch (secret->type) {
	case CEPH_CRYPTO_NONE:
		if (*dst_len < src_len)
			return -ERANGE;
		memcpy(dst, src, src_len);
		*dst_len = src_len;
		return 0;

	case CEPH_CRYPTO_AES:
		return ceph_aes_decrypt(secret->key, secret->len, dst,
					dst_len, src, src_len);

	default:
		return -EINVAL;
	}
}

int ceph_decrypt2(struct ceph_crypto_key *secret,
			void *dst1, size_t *dst1_len,
			void *dst2, size_t *dst2_len,
			const void *src, size_t src_len)
{
	size_t t;

	switch (secret->type) {
	case CEPH_CRYPTO_NONE:
		if (*dst1_len + *dst2_len < src_len)
			return -ERANGE;
		t = min(*dst1_len, src_len);
		memcpy(dst1, src, t);
		*dst1_len = t;
		src += t;
		src_len -= t;
		if (src_len) {
			t = min(*dst2_len, src_len);
			memcpy(dst2, src, t);
			*dst2_len = t;
		}
		return 0;

	case CEPH_CRYPTO_AES:
		return ceph_aes_decrypt2(secret->key, secret->len,
					 dst1, dst1_len, dst2, dst2_len,
					 src, src_len);

	default:
		return -EINVAL;
	}
}

int ceph_encrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
		 const void *src, size_t src_len)
{
	switch (secret->type) {
	case CEPH_CRYPTO_NONE:
		if (*dst_len < src_len)
			return -ERANGE;
		memcpy(dst, src, src_len);
		*dst_len = src_len;
		return 0;

	case CEPH_CRYPTO_AES:
		return ceph_aes_encrypt(secret->key, secret->len, dst,
					dst_len, src, src_len);

	default:
		return -EINVAL;
	}
}

int ceph_encrypt2(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
		  const void *src1, size_t src1_len,
		  const void *src2, size_t src2_len)
{
	switch (secret->type) {
	case CEPH_CRYPTO_NONE:
		if (*dst_len < src1_len + src2_len)
			return -ERANGE;
		memcpy(dst, src1, src1_len);
		memcpy(dst + src1_len, src2, src2_len);
		*dst_len = src1_len + src2_len;
		return 0;

	case CEPH_CRYPTO_AES:
		return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len,
					 src1, src1_len, src2, src2_len);

	default:
		return -EINVAL;
	}
}
Commit	Line	Data
8b6e4f2d SW	1
	2	#include "ceph_debug.h"
	3
	4	#include <linux/err.h>
	5	#include <linux/scatterlist.h>
5a0e3ad6	6	#include <linux/slab.h>
8b6e4f2d SW	7	#include <crypto/hash.h>
	8
	9	#include "crypto.h"
	10	#include "decode.h"
	11
	12	int ceph_crypto_key_encode(struct ceph_crypto_key key, void p, void end)
	13	{
	14	if (*p + sizeof(u16) + sizeof(key->created) +
	15	sizeof(u16) + key->len > end)
	16	return -ERANGE;
	17	ceph_encode_16(p, key->type);
	18	ceph_encode_copy(p, &key->created, sizeof(key->created));
	19	ceph_encode_16(p, key->len);
	20	ceph_encode_copy(p, key->key, key->len);
	21	return 0;
	22	}
	23
	24	int ceph_crypto_key_decode(struct ceph_crypto_key key, void p, void end)
	25	{
	26	ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
	27	key->type = ceph_decode_16(p);
	28	ceph_decode_copy(p, &key->created, sizeof(key->created));
	29	key->len = ceph_decode_16(p);
	30	ceph_decode_need(p, end, key->len, bad);
	31	key->key = kmalloc(key->len, GFP_NOFS);
	32	if (!key->key)
	33	return -ENOMEM;
	34	ceph_decode_copy(p, key->key, key->len);
	35	return 0;
	36
	37	bad:
	38	dout("failed to decode crypto key\n");
	39	return -EINVAL;
	40	}
	41
	42	int ceph_crypto_key_unarmor(struct ceph_crypto_key key, const char inkey)
	43	{
	44	int inlen = strlen(inkey);
	45	int blen = inlen * 3 / 4;
	46	void buf, p;
	47	int ret;
	48
	49	dout("crypto_key_unarmor %s\n", inkey);
	50	buf = kmalloc(blen, GFP_NOFS);
	51	if (!buf)
	52	return -ENOMEM;
	53	blen = ceph_unarmor(buf, inkey, inkey+inlen);
	54	if (blen < 0) {
	55	kfree(buf);
	56	return blen;
	57	}
	58
	59	p = buf;
	60	ret = ceph_crypto_key_decode(key, &p, p + blen);
	61	kfree(buf);
	62	if (ret)
	63	return ret;
	64	dout("crypto_key_unarmor key %p type %d len %d\n", key,
	65	key->type, key->len);
	66	return 0;
	67	}
	68
	69
	70
71	#define AES_KEY_SIZE 16
72
73	static struct crypto_blkcipher *ceph_crypto_alloc_cipher(void)
74	{
75	return crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
76	}
77
78	const u8 *aes_iv = "cephsageyudagreg";
79
80	int ceph_aes_encrypt(const void key, int key_len, void dst, size_t *dst_len,
81	const void *src, size_t src_len)
82	{
83	struct scatterlist sg_in[2], sg_out[1];
84	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
85	struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
86	int ret;
87	void *iv;
88	int ivsize;
89	size_t zero_padding = (0x10 - (src_len & 0x0f));
90	char pad[16];
91
92	if (IS_ERR(tfm))
93	return PTR_ERR(tfm);
94
95	memset(pad, zero_padding, zero_padding);
96
97	*dst_len = src_len + zero_padding;
98
99	crypto_blkcipher_setkey((void *)tfm, key, key_len);
100	sg_init_table(sg_in, 2);
101	sg_set_buf(&sg_in[0], src, src_len);
102	sg_set_buf(&sg_in[1], pad, zero_padding);
103	sg_init_table(sg_out, 1);
104	sg_set_buf(sg_out, dst, *dst_len);
105	iv = crypto_blkcipher_crt(tfm)->iv;
106	ivsize = crypto_blkcipher_ivsize(tfm);
107
108	memcpy(iv, aes_iv, ivsize);
109	/*
110	print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
111	key, key_len, 1);
112	print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1,
113	src, src_len, 1);
114	print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
115	pad, zero_padding, 1);
116	*/
117	ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
118	src_len + zero_padding);
119	crypto_free_blkcipher(tfm);
120	if (ret < 0)
121	pr_err("ceph_aes_crypt failed %d\n", ret);
122	/*
123	print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
124	dst, *dst_len, 1);
125	*/
126	return 0;
127	}
128
129	int ceph_aes_encrypt2(const void key, int key_len, void dst, size_t *dst_len,
130	const void *src1, size_t src1_len,
131	const void *src2, size_t src2_len)
132	{
133	struct scatterlist sg_in[3], sg_out[1];
134	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
135	struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
136	int ret;
137	void *iv;
138	int ivsize;
139	size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f));
140	char pad[16];
141
142	if (IS_ERR(tfm))
143	return PTR_ERR(tfm);
144
145	memset(pad, zero_padding, zero_padding);
146
147	*dst_len = src1_len + src2_len + zero_padding;
148
149	crypto_blkcipher_setkey((void *)tfm, key, key_len);
150	sg_init_table(sg_in, 3);
151	sg_set_buf(&sg_in[0], src1, src1_len);
152	sg_set_buf(&sg_in[1], src2, src2_len);
153	sg_set_buf(&sg_in[2], pad, zero_padding);
154	sg_init_table(sg_out, 1);
155	sg_set_buf(sg_out, dst, *dst_len);
156	iv = crypto_blkcipher_crt(tfm)->iv;
157	ivsize = crypto_blkcipher_ivsize(tfm);
158
159	memcpy(iv, aes_iv, ivsize);
160	/*
161	print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
162	key, key_len, 1);
163	print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1,
164	src1, src1_len, 1);
165	print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1,
166	src2, src2_len, 1);
167	print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
168	pad, zero_padding, 1);
169	*/
170	ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
171	src1_len + src2_len + zero_padding);
172	crypto_free_blkcipher(tfm);
173	if (ret < 0)
174	pr_err("ceph_aes_crypt2 failed %d\n", ret);
175	/*
176	print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
177	dst, *dst_len, 1);
178	*/
179	return 0;
180	}
181
182	int ceph_aes_decrypt(const void key, int key_len, void dst, size_t *dst_len,
183	const void *src, size_t src_len)
184	{
185	struct scatterlist sg_in[1], sg_out[2];
186	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
187	struct blkcipher_desc desc = { .tfm = tfm };
188	char pad[16];
189	void *iv;
190	int ivsize;
191	int ret;
192	int last_byte;
193
194	if (IS_ERR(tfm))
195	return PTR_ERR(tfm);
196
197	crypto_blkcipher_setkey((void *)tfm, key, key_len);
198	sg_init_table(sg_in, 1);
199	sg_init_table(sg_out, 2);
200	sg_set_buf(sg_in, src, src_len);
201	sg_set_buf(&sg_out[0], dst, *dst_len);
202	sg_set_buf(&sg_out[1], pad, sizeof(pad));
203
204	iv = crypto_blkcipher_crt(tfm)->iv;
205	ivsize = crypto_blkcipher_ivsize(tfm);
206
207	memcpy(iv, aes_iv, ivsize);
208
209	/*
210	print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
211	key, key_len, 1);
212	print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
213	src, src_len, 1);
214	*/
215
216	ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
217	crypto_free_blkcipher(tfm);
218	if (ret < 0) {
219	pr_err("ceph_aes_decrypt failed %d\n", ret);
220	return ret;
221	}
222
223	if (src_len <= *dst_len)
224	last_byte = ((char *)dst)[src_len - 1];
225	else
226	last_byte = pad[src_len - *dst_len - 1];
227	if (last_byte <= 16 && src_len >= last_byte) {
228	*dst_len = src_len - last_byte;
229	} else {
230	pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
231	last_byte, (int)src_len);
232	return -EPERM; /* bad padding */
233	}
234	/*
235	print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1,
236	dst, *dst_len, 1);
237	*/
238	return 0;
239	}
240
241	int ceph_aes_decrypt2(const void *key, int key_len,
242	void dst1, size_t dst1_len,
243	void dst2, size_t dst2_len,
244	const void *src, size_t src_len)
245	{
246	struct scatterlist sg_in[1], sg_out[3];
247	struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
248	struct blkcipher_desc desc = { .tfm = tfm };
249	char pad[16];
250	void *iv;
251	int ivsize;
252	int ret;
253	int last_byte;
254
255	if (IS_ERR(tfm))
256	return PTR_ERR(tfm);
257
258	sg_init_table(sg_in, 1);
259	sg_set_buf(sg_in, src, src_len);
260	sg_init_table(sg_out, 3);
261	sg_set_buf(&sg_out[0], dst1, *dst1_len);
262	sg_set_buf(&sg_out[1], dst2, *dst2_len);
263	sg_set_buf(&sg_out[2], pad, sizeof(pad));
264
265	crypto_blkcipher_setkey((void *)tfm, key, key_len);
266	iv = crypto_blkcipher_crt(tfm)->iv;
267	ivsize = crypto_blkcipher_ivsize(tfm);
268
269	memcpy(iv, aes_iv, ivsize);
270
271	/*
272	print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
273	key, key_len, 1);
274	print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
275	src, src_len, 1);
276	*/
277
278	ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
279	crypto_free_blkcipher(tfm);
280	if (ret < 0) {
281	pr_err("ceph_aes_decrypt failed %d\n", ret);
282	return ret;
283	}
284
285	if (src_len <= *dst1_len)
286	last_byte = ((char *)dst1)[src_len - 1];
287	else if (src_len <= dst1_len + dst2_len)
288	last_byte = ((char )dst2)[src_len - dst1_len - 1];
289	else
290	last_byte = pad[src_len - dst1_len - dst2_len - 1];
291	if (last_byte <= 16 && src_len >= last_byte) {
292	src_len -= last_byte;
293	} else {
294	pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
295	last_byte, (int)src_len);
296	return -EPERM; /* bad padding */
297	}
298
299	if (src_len < *dst1_len) {
300	*dst1_len = src_len;
301	*dst2_len = 0;
302	} else {
303	dst2_len = src_len - dst1_len;
304	}
305	/*
306	print_hex_dump(KERN_ERR, "dec out1: ", DUMP_PREFIX_NONE, 16, 1,
307	dst1, *dst1_len, 1);
308	print_hex_dump(KERN_ERR, "dec out2: ", DUMP_PREFIX_NONE, 16, 1,
309	dst2, *dst2_len, 1);
310	*/
311
312	return 0;
313	}
314
315
316	int ceph_decrypt(struct ceph_crypto_key secret, void dst, size_t *dst_len,
317	const void *src, size_t src_len)
318	{
319	switch (secret->type) {
320	case CEPH_CRYPTO_NONE:
321	if (*dst_len < src_len)
322	return -ERANGE;
323	memcpy(dst, src, src_len);
324	*dst_len = src_len;
325	return 0;
326
327	case CEPH_CRYPTO_AES:
328	return ceph_aes_decrypt(secret->key, secret->len, dst,
329	dst_len, src, src_len);
330
331	default:
332	return -EINVAL;
333	}
334	}
335
336	int ceph_decrypt2(struct ceph_crypto_key *secret,
337	void dst1, size_t dst1_len,
338	void dst2, size_t dst2_len,
339	const void *src, size_t src_len)
340	{
341	size_t t;
342
343	switch (secret->type) {
344	case CEPH_CRYPTO_NONE:
345	if (dst1_len + dst2_len < src_len)
346	return -ERANGE;
347	t = min(*dst1_len, src_len);
348	memcpy(dst1, src, t);
349	*dst1_len = t;
350	src += t;
351	src_len -= t;
352	if (src_len) {
353	t = min(*dst2_len, src_len);
354	memcpy(dst2, src, t);
355	*dst2_len = t;
356	}
357	return 0;
358
359	case CEPH_CRYPTO_AES:
360	return ceph_aes_decrypt2(secret->key, secret->len,
361	dst1, dst1_len, dst2, dst2_len,
362	src, src_len);
363
364	default:
365	return -EINVAL;
366	}
367	}
368
369	int ceph_encrypt(struct ceph_crypto_key secret, void dst, size_t *dst_len,
370	const void *src, size_t src_len)
371	{
372	switch (secret->type) {
373	case CEPH_CRYPTO_NONE:
374	if (*dst_len < src_len)
375	return -ERANGE;
376	memcpy(dst, src, src_len);
377	*dst_len = src_len;
378	return 0;
379
380	case CEPH_CRYPTO_AES:
381	return ceph_aes_encrypt(secret->key, secret->len, dst,
382	dst_len, src, src_len);
383
384	default:
385	return -EINVAL;
386	}
387	}
388
389	int ceph_encrypt2(struct ceph_crypto_key secret, void dst, size_t *dst_len,
390	const void *src1, size_t src1_len,
391	const void *src2, size_t src2_len)
392	{
393	switch (secret->type) {
394	case CEPH_CRYPTO_NONE:
395	if (*dst_len < src1_len + src2_len)
396	return -ERANGE;
397	memcpy(dst, src1, src1_len);
398	memcpy(dst + src1_len, src2, src2_len);
399	*dst_len = src1_len + src2_len;
400	return 0;
401
402	case CEPH_CRYPTO_AES:
403	return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len,
404	src1, src1_len, src2, src2_len);
405
406	default:
407	return -EINVAL;
408	}
409	}