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EVP_SIGNATURE-HMAC, EVP_SIGNATURE-Siphash, EVP_SIGNATURE-Poly1305, EVP_SIGNATURE-CMAC — The legacy EVP_PKEY MAC signature implementations
| Use Case | Command / Code | Description |
|---|---|---|
| 🔑 Create HMAC signature | EVP_DigestSignInit(ctx, NULL, EVP_sha256(), NULL, key) | Initialize signing context with HMAC key and SHA-256 (legacy method) |
| 🔑 Create Siphash signature | EVP_DigestSignInit(ctx, NULL, NULL, NULL, siphash_key) | Initialize signing context with Siphash key (legacy method) |
| 🔑 Create Poly1305 signature | EVP_DigestSignInit(ctx, NULL, NULL, NULL, poly1305_key) | Initialize signing context with Poly1305 key (legacy method) |
| 🔑 Create CMAC signature | EVP_DigestSignInit(ctx, NULL, EVP_aes_128_cbc(), NULL, cmac_key) | Initialize signing context with CMAC key and cipher (legacy method) |
| 🔄 Set parameters | EVP_PKEY_CTX_set_params(pctx, params) | Set MAC parameters (same as EVP_MAC_CTX_set_params()) |
| 📚 Modern alternative | EVP_MAC_init(3) family | Preferred way to create MACs — use instead of legacy path |
The algorithms described here have legacy support for creating MACs using EVP_DigestSignInit(3) and related functions. ⚠️ This is not the preferred way of creating MACs. Instead you should use the newer EVP_MAC_init(3) functions. This mechanism is provided for backwards compatibility with older versions of OpenSSL.
The same signature parameters can be set using EVP_PKEY_CTX_set_params() as can be set via EVP_MAC_CTX_set_params() for the underlying EVP_MAC. See EVP_MAC-HMAC(7), EVP_MAC-Siphash(7), EVP_MAC-Poly1305(7) and EVP_MAC-CMAC(7) for details.
See L<EVP_PKEY-HMAC(7)>, L<EVP_PKEY-Siphash(7)>, L<EVP_PKEY-Poly1305(7)> or L<EVP_PKEY-CMAC(7)> for details about parameters that are supported during the creation of an EVP_PKEY.
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>.
3.0.2 — 2026-06-02 — EVP_SIGNATURE-HMAC(7SSL)
Generated by phpman v4.9.26-1-g511901d · Markdown · JSON · MCP Author: Che Dong Under GNU General Public License
2026-08-05 19:44 @216.73.216.192
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