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1.\" $OpenBSD: RSA_sign.3,v 1.8 2019/06/10 14:58:48 schwarze Exp $
2.\" OpenSSL aa90ca11 Aug 20 15:48:56 2016 -0400
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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52.Dd $Mdocdate: June 10 2019 $
53.Dt RSA_SIGN 3
54.Os
55.Sh NAME
56.Nm RSA_sign ,
57.Nm RSA_verify
58.Nd RSA signatures
59.Sh SYNOPSIS
60.In openssl/rsa.h
61.Ft int
62.Fo RSA_sign
63.Fa "int type"
64.Fa "const unsigned char *m"
65.Fa "unsigned int m_len"
66.Fa "unsigned char *sigret"
67.Fa "unsigned int *siglen"
68.Fa "RSA *rsa"
69.Fc
70.Ft int
71.Fo RSA_verify
72.Fa "int type"
73.Fa "const unsigned char *m"
74.Fa "unsigned int m_len"
75.Fa "unsigned char *sigbuf"
76.Fa "unsigned int siglen"
77.Fa "RSA *rsa"
78.Fc
79.Sh DESCRIPTION
80.Fn RSA_sign
81signs the message digest
82.Fa m
83of size
84.Fa m_len
85using the private key
86.Fa rsa
87using RSASSA-PKCS1-v1_5 as specified in RFC 3447.
88It stores the signature in
89.Fa sigret
90and the signature size in
91.Fa siglen .
92.Fa sigret
93must point to
94.Fn RSA_size rsa
95bytes of memory.
96Note that PKCS #1 adds meta-data, placing limits on the size of the key
97that can be used.
98See
99.Xr RSA_private_encrypt 3
100for lower-level operations.
101.Pp
102.Fa type
103denotes the message digest algorithm that was used to generate
104.Fa m .
105If
106.Fa type
107is
108.Sy NID_md5_sha1 ,
109an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding and
110no algorithm identifier) is created.
111.Pp
112.Fn RSA_verify
113verifies that the signature
114.Fa sigbuf
115of size
116.Fa siglen
117matches a given message digest
118.Fa m
119of size
120.Fa m_len .
121.Fa type
122denotes the message digest algorithm that was used to generate the
123signature.
124.Fa rsa
125is the signer's public key.
126.Sh RETURN VALUES
127.Fn RSA_sign
128returns 1 on success.
129.Fn RSA_verify
130returns 1 on successful verification.
131.Pp
132The error codes can be obtained by
133.Xr ERR_get_error 3 .
134.Sh SEE ALSO
135.Xr RSA_meth_set_sign 3 ,
136.Xr RSA_new 3 ,
137.Xr RSA_private_encrypt 3 ,
138.Xr RSA_public_decrypt 3
139.Sh STANDARDS
140SSL, PKCS #1 v2.0
141.Sh HISTORY
142.Fn RSA_sign
143first appeared in SSLeay 0.4.4.
144.Fn RSA_verify
145first appeared in SSLeay 0.6.0.
146Both functions have been available since
147.Ox 2.4 .
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