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RSA_verify.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RSA_sign, RSA_verify \- RSA signatures .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/rsa.h> \& \& int RSA_sign(int type, const unsigned char *m, unsigned int m_len, \& unsigned char *sigret, unsigned int *siglen, RSA *rsa); \& \& int RSA_verify(int type, const unsigned char *m, unsigned int m_len, \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the private key \fBrsa\fR using RSASSA\-PKCS1\-v1_5 as specified in \s-1RFC 3447.\s0 It stores the signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \&\fBsigret\fR must point to RSA_size(\fBrsa\fR) bytes of memory. Note that \s-1PKCS\s0 #1 adds meta-data, placing limits on the size of the key that can be used. See \fBRSA_private_encrypt\fR\|(3) for lower-level operations. .PP \&\fBtype\fR denotes the message digest algorithm that was used to generate \&\fBm\fR. If \fBtype\fR is \fBNID_md5_sha1\fR, an \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #1 padding and no algorithm identifier) is created. .PP \&\fBRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes the message digest algorithm that was used to generate the signature. \&\fBrsa\fR is the signer's public key. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRSA_sign()\fR returns 1 on success. \&\fBRSA_verify()\fR returns 1 on successful verification. .PP The error codes can be obtained by \fBERR_get_error\fR\|(3). .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1SSL, PKCS\s0 #1 v2.0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \&\fBRSA_private_encrypt\fR\|(3), \&\fBRSA_public_decrypt\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP 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>.
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