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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> .Ve

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.Vb 1 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" All of the functions described on this page are deprecated. Applications should instead use EVP_PKEY_sign_init\|(3), EVP_PKEY_sign\|(3), \fBEVP_PKEY_verify_init\|(3) and EVP_PKEY_verify\|(3).

\fBDSA_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.

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

\fBDSA_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" \fBDSA_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 \fBERR_get_error\|(3). Header "SEE ALSO" \fBDSA_new\|(3), ERR_get_error\|(3), RAND_bytes\|(3), \fBDSA_SIG_new\|(3), \fBDSA_sign\|(3) Header "HISTORY" All of these functions were deprecated in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2000-2021 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>.