EVP_MD-COMMON(7ossl)

📦
version 3.5.9 · 8 versions
, in alpine 3.23, alpine 3.24

🎀 NAME 🎀

EVP_MD-common — The OpenSSL EVP_MD implementations, common things.

✨ DESCRIPTION ✨

Okay bestie, welcome to EVP_MD-COMMON(7ossl) — the OpenSSL manual page that spills the shared common tea for EVP_MD implementations. 💅

All the OpenSSL EVP_MD implementations understand the following OSSL_PARAM(3) entries that are gettable with EVP_MD_get_params(3), as well as these:

  • "blocksize" (OSSL_DIGEST_PARAM_BLOCK_SIZE) <unsigned integer> — the digest block size. The length of the "blocksize" parameter should not exceed that of a size_t. You can also retrieve this value with EVP_MD_get_block_size(3).
  • "size" (OSSL_DIGEST_PARAM_SIZE) <unsigned integer> — the digest output size. The length of the "size" parameter should not exceed that of a size_t. You can also retrieve this value with EVP_MD_get_size(3).
  • "flags" (OSSL_DIGEST_PARAM_FLAGS) <unsigned integer> — diverse flags that describe exceptional behaviour for the digest. These flags are described in "DESCRIPTION" in EVP_MD_meth_set_flags(3). The length of the "flags" parameter should equal that of an unsigned long int. You can also retrieve this value with EVP_MD_get_flags(3).

🧪 FIPS indicator 🧪

Digest implementations in the OpenSSL FIPS provider make the following parameter available with EVP_MD_CTX_get_params(3):

  • "fips-indicator" (OSSL_DIGEST_PARAM_FIPS_APPROVED_INDICATOR) <integer> — returns 1 if the operation is FIPS approved, or 0 otherwise. See "FIPS indicators" in fips_module(7) for more information.

👀 SEE ALSO 👀

"PARAMETERS" in EVP_DigestInit(3), EVP_MD_get_params(3), provider-digest(7)

Copyright 2020-2026 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>.

Signed off with love 💌 — OpenSSL 3.5.9, dated 2026-09-29, page EVP_MD-COMMON(7ossl). Bye bestie, slay your digests! 🫶✨

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