224 lines
7.0 KiB
Groff
224 lines
7.0 KiB
Groff
.\" $NetBSD: EVP_SignInit.3,v 1.6 2002/02/07 07:00:39 ross Exp $
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.\" ======================================================================
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.\"
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.IX Title "EVP_SignInit 3"
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.TH EVP_SignInit 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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EVP_SignInit, EVP_SignUpdate, EVP_SignFinal \- \s-1EVP\s0 signing functions
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include \*[Lt]openssl/evp.h\*[Gt]
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.Ve
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.Vb 3
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\& void EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type);
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\& void EVP_SignUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt);
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\& int EVP_SignFinal(EVP_MD_CTX *ctx,unsigned char *sig,unsigned int *s, EVP_PKEY *pkey);
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.Ve
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.Vb 1
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\& int EVP_PKEY_size(EVP_PKEY *pkey);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP\s0 signature routines are a high level interface to digital
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signatures.
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.PP
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\&\fIEVP_SignInit()\fR initializes a signing context \fBctx\fR to using digest
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\&\fBtype\fR: this will typically be supplied by a function such as
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\&\fIEVP_sha1()\fR.
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.PP
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\&\fIEVP_SignUpdate()\fR hashes \fBcnt\fR bytes of data at \fBd\fR into the
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signature context \fBctx\fR. This function can be called several times on the
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same \fBctx\fR to include additional data.
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.PP
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\&\fIEVP_SignFinal()\fR signs the data in \fBctx\fR using the private key \fBpkey\fR
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and places the signature in \fBsig\fR. If the \fBs\fR parameter is not \s-1NULL\s0
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then the number of bytes of data written (i.e. the length of the signature)
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will be written to the integer at \fBs\fR, at most EVP_PKEY_size(pkey) bytes
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will be written. After calling \fIEVP_SignFinal()\fR no additional calls to
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\&\fIEVP_SignUpdate()\fR can be made, but \fIEVP_SignInit()\fR can be called to initialize
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a new signature operation.
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.PP
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\&\fIEVP_PKEY_size()\fR returns the maximum size of a signature in bytes. The actual
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signature returned by \fIEVP_SignFinal()\fR may be smaller.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_SignInit()\fR and \fIEVP_SignUpdate()\fR do not return values.
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.PP
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\&\fIEVP_SignFinal()\fR returns 1 for success and 0 for failure.
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.PP
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\&\fIEVP_PKEY_size()\fR returns the maximum size of a signature in bytes.
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.PP
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The error codes can be obtained by ERR_get_error(3).
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.SH "NOTES"
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.IX Header "NOTES"
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The \fB\s-1EVP\s0\fR interface to digital signatures should almost always be used in
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preference to the low level interfaces. This is because the code then becomes
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transparent to the algorithm used and much more flexible.
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.PP
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Due to the link between message digests and public key algorithms the correct
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digest algorithm must be used with the correct public key type. A list of
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algorithms and associated public key algorithms appears in
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EVP_DigestInit(3).
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.PP
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When signing with \s-1DSA\s0 private keys the random number generator must be seeded
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or the operation will fail. The random number generator does not need to be
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seeded for \s-1RSA\s0 signatures.
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.SH "BUGS"
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.IX Header "BUGS"
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Several of the functions do not return values: maybe they should. Although the
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internal digest operations will never fail some future hardware based operations
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might.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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EVP_VerifyInit(3),
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EVP_DigestInit(3), openssl_err(3),
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openssl_evp(3), openssl_hmac(3), md2(3),
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openssl_md5(3), openssl_mdc2(3), openssl_ripemd(3),
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openssl_sha(3), digest(1)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIEVP_SignInit()\fR, \fIEVP_SignUpdate()\fR and \fIEVP_SignFinal()\fR are
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available in all versions of SSLeay and OpenSSL.
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