1 .\" $OpenBSD: EVP_PKEY_get_default_digest_nid.3,v 1.2 2016/11/27 15:27:19 schwarze Exp $
2 .\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
4 .\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
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51 .Dd $Mdocdate: November 27 2016 $
52 .Dt EVP_PKEY_GET_DEFAULT_DIGEST_NID 3
55 .Nm EVP_PKEY_get_default_digest_nid
56 .Nd get default signature digest
60 .Fo EVP_PKEY_get_default_digest_nid
66 .Fn EVP_PKEY_get_default_digest_nid
69 to the default message digest NID for the public key signature
70 operations associated with key
73 For all current standard OpenSSL public key algorithms, SHA1 is returned.
76 .Fn EVP_PKEY_get_default_digest_nid
77 function returns 1 if the message digest is advisory (that is other
78 digests can be used) and 2 if it is mandatory (other digests cannot be
80 It returns 0 or a negative value for failure.
81 In particular, a return value of -2 indicates the operation is not
82 supported by the public key algorithm.
84 .Xr EVP_PKEY_CTX_ctrl 3 ,
85 .Xr EVP_PKEY_CTX_new 3 ,
87 .Xr EVP_PKEY_verify 3 ,
88 .Xr EVP_PKEY_verify_recover 3
90 This function was first added to OpenSSL 1.0.0.