lib/crypto/chacha.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
27 		x[3]  += x[7];    x[15] = rol32(x[15] ^ x[3],  16);  in chacha_permute()
32 		x[11] += x[15];   x[7]  = rol32(x[7]  ^ x[11], 12);  in chacha_permute()
37 		x[3]  += x[7];    x[15] = rol32(x[15] ^ x[3],   8);  in chacha_permute()
42 		x[11] += x[15];   x[7]  = rol32(x[7]  ^ x[11],  7);  in chacha_permute()
44 		x[0]  += x[5];    x[15] = rol32(x[15] ^ x[0],  16);  in chacha_permute()
49 		x[10] += x[15];   x[5]  = rol32(x[5]  ^ x[10], 12);  in chacha_permute()
54 		x[0]  += x[5];    x[15] = rol32(x[15] ^ x[0],   8);  in chacha_permute()
59 		x[10] += x[15];   x[5]  = rol32(x[5]  ^ x[10],  7);  in chacha_permute()
67  * chacha_block_generic - generate one keystream block and increment block counter
68  * @state: input state matrix (16 32-bit words)
72  * This is the ChaCha core, a function from 64-byte strings to 64-byte strings.
73  * The caller has already converted the endianness of the input.  This function
74  * also handles incrementing the block counter in the input matrix.
93  * hchacha_block_generic - abbreviated ChaCha core, for XChaCha
94  * @state: input state matrix (16 32-bit words)
95  * @stream: output (8 32-bit words)
99  * towards XChaCha (see https://cr.yp.to/snuffle/xsalsa-20081128.pdf).  HChaCha