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EVP_MD-COMMON(7SSL) — OpenSSL

📛 NAME

EVP_MD-common - The OpenSSL EVP_MD implementations, common things

🚀 Quick Reference

Use Case	Command	Description
Retrieve digest block size	EVP_MD_get_block_size(3)	Get the internal block size of the digest
Retrieve digest output size	EVP_MD_get_size(3)	Get the output digest size
Retrieve digest flags	EVP_MD_get_flags(3)	Get flags describing exceptional behaviour
Get all parameters via OSSL_PARAM	EVP_MD_get_params(3)	Retrieve any settable/gettable parameter

📖 DESCRIPTION

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.
  This value can also be retrieved 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.
  This value can also be retrieved 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.
  This value can also be retrieved with EVP_MD_get_flags(3).

📚 SEE ALSO

EVP_MD_get_params(3), provider-digest(7)

©️ COPYRIGHT

Copyright 2020-2021 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_MD-COMMON(7SSL)

EVP_MD-COMMON(7SSL) — OpenSSL 📛 NAME 🚀 Quick Reference 📖 DESCRIPTION 📚 SEE ALSO ©️ COPYRIGHT