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📛 NAME

EVP_MD-SHAKE, EVP_MD-KECCAK-KMAC - The SHAKE / KECCAK family EVP_MD implementations

🚀 Quick Reference

Use Case	Command	Description
🧪 Create SHAKE-128 context	EVP_MD_CTX_new()	Allocate new digest context
🔧 Initialize digest	EVP_DigestInit_ex(ctx, EVP_shake128(), NULL)	Set SHAKE-128 algorithm
📏 Set XOF output length	EVP_MD_CTX_set_params(ctx, params) with "xoflen"	Define variable output length
🔄 Update digest	EVP_DigestUpdate(ctx, data, len)	Feed data into digest
✅ Finalize and get digest	EVP_DigestFinalXOF(ctx, md, &mdlen)	Obtain the extendable-output digest

📖 DESCRIPTION

Support for computing SHAKE or KECCAK-KMAC digests through the EVP_MD API.

KECCAK-KMAC is a special digest that's used by the KMAC EVP_MAC implementation (see EVP_MAC-KMAC(7)).

🔖 Identities

• 🔹 KECCAK-KMAC-128 — Known names are "KECCAK-KMAC-128" and "KECCAK-KMAC128"
• 🔹 KECCAK-KMAC-256 — Known names are "KECCAK-KMAC-256" and "KECCAK-KMAC256"
• 🔹 SHAKE-128 — Known names are "SHAKE-128" and "SHAKE128"
• 🔹 SHAKE-256 — Known names are "SHAKE-256" and "SHAKE256"

📊 Gettable Parameters

This implementation supports the common gettable parameters described in EVP_MD-common(7).

⚙️ Settable Context Parameters

These implementations support the following OSSL_PARAM(3) entries, settable for an EVP_MD_CTX with EVP_MD_CTX_set_params(3):

• 📏 "xoflen" (OSSL_DIGEST_PARAM_XOFLEN) <unsigned integer> — Sets the digest length for extendable output functions. The length of the "xoflen" parameter should not exceed that of a size_t.

🔗 SEE ALSO

• 📘 EVP_MD_CTX_set_params(3)
• 📘 provider-digest(7)
• 📘 OSSL_PROVIDER-default(7)

©️ COPYRIGHT

Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

📛 NAME 🚀 Quick Reference 📖 DESCRIPTION 🔗 SEE ALSO ©️ COPYRIGHT