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Title "EVP_PKEY_GET_DEFAULT_DIGEST_NID 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
EVP_PKEY_get_default_digest_nid, EVP_PKEY_get_default_digest_name \- get default signature digest Header "SYNOPSIS" .Vb 1 #include <openssl/evp.h> \& int EVP_PKEY_get_default_digest_name(EVP_PKEY *pkey, char *mdname, size_t mdname_sz); int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid); .Ve Header "DESCRIPTION" \fBEVP_PKEY_get_default_digest_name() fills in the default message digest name for the public key signature operations associated with key \fIpkey into mdname, up to at most mdname_sz bytes including the ending \s-1NUL\s0 byte. The name could be "UNDEF", signifying that a digest must (for return value 2) or may (for return value 1) be left unspecified.

\fBEVP_PKEY_get_default_digest_nid() sets pnid to the default message digest \s-1NID\s0 for the public key signature operations associated with key \fIpkey. Note that some signature algorithms (i.e. Ed25519 and Ed448) do not use a digest during signing. In this case pnid will be set to NID_undef. This function is only reliable for legacy keys, which are keys with a \s-1EVP_PKEY_ASN1_METHOD\s0; these keys have typically been loaded from engines, or created with EVP_PKEY_assign_RSA\|(3) or similar.

Header "NOTES" For all current standard OpenSSL public key algorithms \s-1SHA256\s0 is returned. Header "RETURN VALUES" \fBEVP_PKEY_get_default_digest_name() and EVP_PKEY_get_default_digest_nid() both return 1 if the message digest is advisory (that is other digests can be used) and 2 if it is mandatory (other digests can not be used). They return 0 or a negative value for failure. In particular a return value of -2 indicates the operation is not supported by the public key algorithm. Header "SEE ALSO" \fBEVP_PKEY_CTX_new\|(3), \fBEVP_PKEY_sign\|(3), \fBEVP_PKEY_digestsign_supports_digest\|(3), \fBEVP_PKEY_verify\|(3), \fBEVP_PKEY_verify_recover\|(3), Header "HISTORY" This function was added in OpenSSL 1.0.0. Header "COPYRIGHT" Copyright 2006-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.