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22#include <crypto/aes.h>
23#include <crypto/algapi.h>
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/crypto.h>
27#include <asm/vio.h>
28
29#include "nx_csbcpb.h"
30#include "nx.h"
31
32
33static int ecb_aes_nx_set_key(struct crypto_tfm *tfm,
34 const u8 *in_key,
35 unsigned int key_len)
36{
37 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
38 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
39
40 nx_ctx_init(nx_ctx, HCOP_FC_AES);
41
42 switch (key_len) {
43 case AES_KEYSIZE_128:
44 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
45 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
46 break;
47 case AES_KEYSIZE_192:
48 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
49 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
50 break;
51 case AES_KEYSIZE_256:
52 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
53 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
54 break;
55 default:
56 return -EINVAL;
57 }
58
59 csbcpb->cpb.hdr.mode = NX_MODE_AES_ECB;
60 memcpy(csbcpb->cpb.aes_ecb.key, in_key, key_len);
61
62 return 0;
63}
64
65static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,
66 struct scatterlist *dst,
67 struct scatterlist *src,
68 unsigned int nbytes,
69 int enc)
70{
71 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
72 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
73 unsigned long irq_flags;
74 unsigned int processed = 0, to_process;
75 u32 max_sg_len;
76 int rc;
77
78 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
79
80 max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
81 nx_ctx->ap->sglen);
82
83 if (enc)
84 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
85 else
86 NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
87
88 do {
89 to_process = min_t(u64, nbytes - processed,
90 nx_ctx->ap->databytelen);
91 to_process = min_t(u64, to_process,
92 NX_PAGE_SIZE * (max_sg_len - 1));
93 to_process = to_process & ~(AES_BLOCK_SIZE - 1);
94
95 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process,
96 processed, NULL);
97 if (rc)
98 goto out;
99
100 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
101 rc = -EINVAL;
102 goto out;
103 }
104
105 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
106 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
107 if (rc)
108 goto out;
109
110 atomic_inc(&(nx_ctx->stats->aes_ops));
111 atomic64_add(csbcpb->csb.processed_byte_count,
112 &(nx_ctx->stats->aes_bytes));
113
114 processed += to_process;
115 } while (processed < nbytes);
116
117out:
118 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
119 return rc;
120}
121
122static int ecb_aes_nx_encrypt(struct blkcipher_desc *desc,
123 struct scatterlist *dst,
124 struct scatterlist *src,
125 unsigned int nbytes)
126{
127 return ecb_aes_nx_crypt(desc, dst, src, nbytes, 1);
128}
129
130static int ecb_aes_nx_decrypt(struct blkcipher_desc *desc,
131 struct scatterlist *dst,
132 struct scatterlist *src,
133 unsigned int nbytes)
134{
135 return ecb_aes_nx_crypt(desc, dst, src, nbytes, 0);
136}
137
138struct crypto_alg nx_ecb_aes_alg = {
139 .cra_name = "ecb(aes)",
140 .cra_driver_name = "ecb-aes-nx",
141 .cra_priority = 300,
142 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
143 .cra_blocksize = AES_BLOCK_SIZE,
144 .cra_alignmask = 0xf,
145 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
146 .cra_type = &crypto_blkcipher_type,
147 .cra_module = THIS_MODULE,
148 .cra_init = nx_crypto_ctx_aes_ecb_init,
149 .cra_exit = nx_crypto_ctx_exit,
150 .cra_blkcipher = {
151 .min_keysize = AES_MIN_KEY_SIZE,
152 .max_keysize = AES_MAX_KEY_SIZE,
153 .setkey = ecb_aes_nx_set_key,
154 .encrypt = ecb_aes_nx_encrypt,
155 .decrypt = ecb_aes_nx_decrypt,
156 }
157};
158
