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.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
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Title "DSA_do_sign 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
DSA_do_sign, DSA_do_verify - raw DSA signature operations Header "SYNOPSIS" .Vb 1 #include <openssl/dsa.h> \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); \& int DSA_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig, DSA *dsa); .Ve Header "DESCRIPTION" \fIDSA_do_sign() computes a digital signature on the len byte message digest dgst using the private key dsa and returns it in a newly allocated \s-1DSA_SIG\s0 structure.

\fIDSA_sign_setup\|(3) may be used to precompute part of the signing operation in case signature generation is time-critical.

\fIDSA_do_verify() verifies that the signature sig matches a given message digest dgst of size len. dsa is the signer's public key.

Header "RETURN VALUES" \fIDSA_do_sign() returns the signature, \s-1NULL\s0 on error. DSA_do_verify() returns 1 for a valid signature, 0 for an incorrect signature and -1 on error. The error codes can be obtained by \fIERR_get_error\|(3). Header "SEE ALSO" \fIdsa\|(3), ERR_get_error\|(3), rand\|(3), \fIDSA_SIG_new\|(3), \fIDSA_sign\|(3) Header "HISTORY" \fIDSA_do_sign() and DSA_do_verify() were added in OpenSSL 0.9.3.