1 .\" $OpenBSD: DSA_sign.3,v 1.8 2018/03/27 17:35:50 schwarze Exp $
2 .\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
4 .\" This file was written by Ulf Moeller <ulf@openssl.org>.
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51 .Dd $Mdocdate: March 27 2018 $
64 .Fa "const unsigned char *dgst"
66 .Fa "unsigned char *sigret"
67 .Fa "unsigned int *siglen"
80 .Fa "const unsigned char *dgst"
82 .Fa "unsigned char *sigbuf"
88 computes a digital signature on the
94 and places its ASN.1 DER encoding at
96 The length of the signature is placed in
104 may be used to precompute part of the signing operation in case
105 signature generation is time-critical.
108 to contain DSA parameters.
109 It places the precomputed values in newly allocated
115 after freeing the old ones unless
121 These values may be passed to
134 verifies that the signature
138 matches a given message digest
143 is the signer's public key.
147 parameter is ignored.
152 return 1 on success or 0 on error.
154 returns 1 for a valid signature, 0 for an incorrect signature,
156 The error codes can be obtained by
157 .Xr ERR_get_error 3 .
162 .Xr ERR_get_error 3 ,
165 US Federal Information Processing Standard FIPS 186 (Digital Signature
166 Standard, DSS), ANSI X9.30
171 first appeared in SSLeay 0.6.0.
173 first appeared in SSLeay 0.8.0.
174 All these functions have been available since