1 /*
2 * Copyright 2024-2025 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <openssl/evp.h>
11
12 static ossl_inline ossl_unused int
shake_xof(EVP_MD_CTX * ctx,const EVP_MD * md,const uint8_t * in,size_t in_len,uint8_t * out,size_t out_len)13 shake_xof(EVP_MD_CTX *ctx, const EVP_MD *md, const uint8_t *in, size_t in_len,
14 uint8_t *out, size_t out_len)
15 {
16 return (EVP_DigestInit_ex2(ctx, md, NULL) == 1
17 && EVP_DigestUpdate(ctx, in, in_len) == 1
18 && EVP_DigestSqueeze(ctx, out, out_len) == 1);
19 }
20
21 static ossl_inline ossl_unused int
shake_xof_2(EVP_MD_CTX * ctx,const EVP_MD * md,const uint8_t * in1,size_t in1_len,const uint8_t * in2,size_t in2_len,uint8_t * out,size_t out_len)22 shake_xof_2(EVP_MD_CTX *ctx, const EVP_MD *md, const uint8_t *in1, size_t in1_len,
23 const uint8_t *in2, size_t in2_len, uint8_t *out, size_t out_len)
24 {
25 return EVP_DigestInit_ex2(ctx, md, NULL)
26 && EVP_DigestUpdate(ctx, in1, in1_len)
27 && EVP_DigestUpdate(ctx, in2, in2_len)
28 && EVP_DigestSqueeze(ctx, out, out_len);
29 }
30
31 static ossl_inline ossl_unused int
shake_xof_3(EVP_MD_CTX * ctx,const EVP_MD * md,const uint8_t * in1,size_t in1_len,const uint8_t * in2,size_t in2_len,const uint8_t * in3,size_t in3_len,uint8_t * out,size_t out_len)32 shake_xof_3(EVP_MD_CTX *ctx, const EVP_MD *md, const uint8_t *in1, size_t in1_len,
33 const uint8_t *in2, size_t in2_len,
34 const uint8_t *in3, size_t in3_len, uint8_t *out, size_t out_len)
35 {
36 return EVP_DigestInit_ex2(ctx, md, NULL)
37 && EVP_DigestUpdate(ctx, in1, in1_len)
38 && EVP_DigestUpdate(ctx, in2, in2_len)
39 && EVP_DigestUpdate(ctx, in3, in3_len)
40 && EVP_DigestSqueeze(ctx, out, out_len);
41 }
42