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Title "DSA_SIGN 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures Header "SYNOPSIS" .Vb 1 #include <openssl/dsa.h> \& int DSA_sign(int type, const unsigned char *dgst, int len, unsigned char *sigret, unsigned int *siglen, DSA *dsa); \& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp); \& int DSA_verify(int type, const unsigned char *dgst, int len, unsigned char *sigbuf, int siglen, DSA *dsa); .Ve Header "DESCRIPTION" \fBDSA_sign() computes a digital signature on the len byte message digest dgst using the private key dsa and places its \s-1ASN.1 DER\s0 encoding at sigret. The length of the signature is places in *siglen. sigret must point to DSA_size(dsa) bytes of memory.

\fBDSA_sign_setup() is defined only for backward binary compatibility and should not be used. Since OpenSSL 1.1.0 the \s-1DSA\s0 type is opaque and the output of \fBDSA_sign_setup() cannot be used anyway: calling this function will only cause overhead, and does not affect the actual signature (pre-)computation.

\fBDSA_verify() verifies that the signature sigbuf of size siglen matches a given message digest dgst of size len. \fBdsa is the signer's public key.

The type parameter is ignored.

The random generator must be seeded when DSA_sign() (or DSA_sign_setup()) is called. If the automatic seeding or reseeding of the OpenSSL \s-1CSPRNG\s0 fails due to external circumstances (see \s-1RAND\s0\|(7)), the operation will fail.

Header "RETURN VALUES" \fBDSA_sign() and DSA_sign_setup() return 1 on success, 0 on error. \fBDSA_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 "CONFORMING TO" \s-1US\s0 Federal Information Processing Standard \s-1FIPS 186\s0 (Digital Signature Standard, \s-1DSS\s0), \s-1ANSI X9.30\s0 Header "SEE ALSO" \fBDSA_new\|(3), ERR_get_error\|(3), RAND_bytes\|(3), \fBDSA_do_sign\|(3), \s-1RAND\s0\|(7) Header "COPYRIGHT" Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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>.