1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * Common values for the Poly1305 algorithm 3 * Common values for the Poly1305 algorithm
4 */ 4 */
5 5
6 #ifndef _CRYPTO_INTERNAL_POLY1305_H 6 #ifndef _CRYPTO_INTERNAL_POLY1305_H
7 #define _CRYPTO_INTERNAL_POLY1305_H 7 #define _CRYPTO_INTERNAL_POLY1305_H
8 8
9 #include <asm/unaligned.h> 9 #include <asm/unaligned.h>
10 #include <linux/types.h> 10 #include <linux/types.h>
11 #include <crypto/poly1305.h> 11 #include <crypto/poly1305.h>
12 12
13 /* 13 /*
14 * Poly1305 core functions. These only accept !! 14 * Poly1305 core functions. These implement the ε-almost-∆-universal hash
15 * handle any needed block buffering and paddi !! 15 * function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
16 * full blocks, or 0 for the final block if it !! 16 * ("s key") at the end. They also only support block-aligned inputs.
17 * non-NULL, then it's added at the end to com <<
18 * only the ε-almost-∆-universal hash funct <<
19 */ 17 */
20 !! 18 void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
21 void poly1305_core_setkey(struct poly1305_core <<
22 const u8 raw_key[POL <<
23 static inline void poly1305_core_init(struct p 19 static inline void poly1305_core_init(struct poly1305_state *state)
24 { 20 {
25 *state = (struct poly1305_state){}; 21 *state = (struct poly1305_state){};
26 } 22 }
27 23
28 void poly1305_core_blocks(struct poly1305_stat 24 void poly1305_core_blocks(struct poly1305_state *state,
29 const struct poly130 !! 25 const struct poly1305_key *key, const void *src,
30 unsigned int nblocks 26 unsigned int nblocks, u32 hibit);
31 void poly1305_core_emit(const struct poly1305_ !! 27 void poly1305_core_emit(const struct poly1305_state *state, void *dst);
32 void *dst); !! 28
>> 29 /*
>> 30 * Poly1305 requires a unique key for each tag, which implies that we can't set
>> 31 * it on the tfm that gets accessed by multiple users simultaneously. Instead we
>> 32 * expect the key as the first 32 bytes in the update() call.
>> 33 */
>> 34 static inline
>> 35 unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
>> 36 const u8 *src, unsigned int srclen)
>> 37 {
>> 38 if (!dctx->sset) {
>> 39 if (!dctx->rset && srclen >= POLY1305_BLOCK_SIZE) {
>> 40 poly1305_core_setkey(dctx->r, src);
>> 41 src += POLY1305_BLOCK_SIZE;
>> 42 srclen -= POLY1305_BLOCK_SIZE;
>> 43 dctx->rset = 1;
>> 44 }
>> 45 if (srclen >= POLY1305_BLOCK_SIZE) {
>> 46 dctx->s[0] = get_unaligned_le32(src + 0);
>> 47 dctx->s[1] = get_unaligned_le32(src + 4);
>> 48 dctx->s[2] = get_unaligned_le32(src + 8);
>> 49 dctx->s[3] = get_unaligned_le32(src + 12);
>> 50 src += POLY1305_BLOCK_SIZE;
>> 51 srclen -= POLY1305_BLOCK_SIZE;
>> 52 dctx->sset = true;
>> 53 }
>> 54 }
>> 55 return srclen;
>> 56 }
33 57
34 #endif 58 #endif
35 59
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