1 /* This file is in the public domain. */
2
3 #include <sys/cdefs.h>
4 #include <opencrypto/xform_auth.h>
5
6 #include <sodium/crypto_onetimeauth_poly1305.h>
7
8 struct poly1305_xform_ctx {
9 struct crypto_onetimeauth_poly1305_state state;
10 };
11 CTASSERT(sizeof(union authctx) >= sizeof(struct poly1305_xform_ctx));
12
13 CTASSERT(POLY1305_KEY_LEN == crypto_onetimeauth_poly1305_KEYBYTES);
14 CTASSERT(POLY1305_HASH_LEN == crypto_onetimeauth_poly1305_BYTES);
15 CTASSERT(POLY1305_BLOCK_LEN == crypto_onetimeauth_poly1305_BYTES);
16
17 static void
xform_Poly1305_Init(void * polyctx)18 xform_Poly1305_Init(void *polyctx)
19 {
20 /* Nop */
21 }
22
23 static void
xform_Poly1305_Setkey(void * ctx,const uint8_t * key,u_int klen)24 xform_Poly1305_Setkey(void *ctx, const uint8_t *key, u_int klen)
25 {
26 struct poly1305_xform_ctx *polyctx = ctx;
27 int rc;
28
29 if (klen != POLY1305_KEY_LEN)
30 panic("%s: Bogus keylen: %u bytes", __func__, (unsigned)klen);
31
32 rc = crypto_onetimeauth_poly1305_init(&polyctx->state, key);
33 if (rc != 0)
34 panic("%s: Invariant violated: %d", __func__, rc);
35 }
36
37 static int
xform_Poly1305_Update(void * ctx,const void * data,u_int len)38 xform_Poly1305_Update(void *ctx, const void *data, u_int len)
39 {
40 struct poly1305_xform_ctx *polyctx = ctx;
41 int rc;
42
43 rc = crypto_onetimeauth_poly1305_update(&polyctx->state, data, len);
44 if (rc != 0)
45 panic("%s: Invariant violated: %d", __func__, rc);
46 return (0);
47 }
48
49 static void
xform_Poly1305_Final(uint8_t * digest,void * ctx)50 xform_Poly1305_Final(uint8_t *digest, void *ctx)
51 {
52 struct poly1305_xform_ctx *polyctx = ctx;
53 int rc;
54
55 rc = crypto_onetimeauth_poly1305_final(&polyctx->state, digest);
56 if (rc != 0)
57 panic("%s: Invariant violated: %d", __func__, rc);
58 }
59
60 const struct auth_hash auth_hash_poly1305 = {
61 .type = CRYPTO_POLY1305,
62 .name = "Poly-1305",
63 .keysize = POLY1305_KEY_LEN,
64 .hashsize = POLY1305_HASH_LEN,
65 .ctxsize = sizeof(struct poly1305_xform_ctx),
66 .blocksize = POLY1305_BLOCK_LEN,
67 .Init = xform_Poly1305_Init,
68 .Setkey = xform_Poly1305_Setkey,
69 .Update = xform_Poly1305_Update,
70 .Final = xform_Poly1305_Final,
71 };
72