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1.\" $OpenBSD: RSA_private_encrypt.3,v 1.10 2019/06/10 14:58:48 schwarze Exp $
2.\" OpenSSL RSA_private_encrypt.pod b41f6b64 Mar 10 15:49:04 2017 +0000
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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51.Dd $Mdocdate: June 10 2019 $
52.Dt RSA_PRIVATE_ENCRYPT 3
53.Os
54.Sh NAME
55.Nm RSA_private_encrypt ,
56.Nm RSA_public_decrypt
57.Nd low level signature operations
58.Sh SYNOPSIS
59.In openssl/rsa.h
60.Ft int
61.Fo RSA_private_encrypt
62.Fa "int flen"
63.Fa "const unsigned char *from"
64.Fa "unsigned char *to"
65.Fa "RSA *rsa"
66.Fa "int padding"
67.Fc
68.Ft int
69.Fo RSA_public_decrypt
70.Fa "int flen"
71.Fa "const unsigned char *from"
72.Fa "unsigned char *to"
73.Fa "RSA *rsa"
74.Fa "int padding"
75.Fc
76.Sh DESCRIPTION
77These functions handle RSA signatures at a low level.
78.Pp
79.Fn RSA_private_encrypt
80signs the
81.Fa flen
82bytes at
83.Fa from
84(usually a message digest with an algorithm identifier) using the
85private key
86.Fa rsa
87and stores the signature in
88.Fa to .
89.Fa to
90must point to
91.Fn RSA_size rsa
92bytes of memory.
93.Pp
94.Fa padding
95denotes one of the following modes:
96.Bl -tag -width Ds
97.It Dv RSA_PKCS1_PADDING
98PKCS #1 v1.5 padding.
99This function does not handle the
100.Sy algorithmIdentifier
101specified in PKCS #1.
102When generating or verifying PKCS #1 signatures,
103.Xr RSA_sign 3
104and
105.Xr RSA_verify 3
106should be used.
107.It Dv RSA_NO_PADDING
108Raw RSA signature.
109This mode should only be used to implement cryptographically sound
110padding modes in the application code.
111Signing user data directly with RSA is insecure.
112.El
113.Pp
114.Fn RSA_public_decrypt
115recovers the message digest from the
116.Fa flen
117bytes long signature at
118.Fa from
119using the signer's public key
120.Fa rsa .
121.Fa to
122must point to a memory section large enough to hold the message digest
123(which is smaller than
124.Fn RSA_size rsa
125- 11).
126.Fa padding
127is the padding mode that was used to sign the data.
128.Sh RETURN VALUES
129.Fn RSA_private_encrypt
130returns the size of the signature (i.e.\&
131.Fn RSA_size rsa ) .
132.Fn RSA_public_decrypt
133returns the size of the recovered message digest.
134.Pp
135On error, -1 is returned; the error codes can be obtained by
136.Xr ERR_get_error 3 .
137.Sh SEE ALSO
138.Xr RSA_meth_set_priv_enc 3 ,
139.Xr RSA_new 3 ,
140.Xr RSA_sign 3 ,
141.Xr RSA_verify 3
142.Sh HISTORY
143.Fn RSA_private_encrypt
144and
145.Fn RSA_public_decrypt
146appeared in SSLeay 0.4 or earlier and have been available since
147.Ox 2.4 .
148.Pp
149.Dv RSA_NO_PADDING
150is available since SSLeay 0.9.0.
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-06 22:54:07 +0000