1RSA_padding_add_PKCS1_type_1(3)     OpenSSL    RSA_padding_add_PKCS1_type_1(3)
2
3
4

NAME

6       RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1,
7       RSA_padding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2,
8       RSA_padding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP,
9       RSA_padding_add_SSLv23, RSA_padding_check_SSLv23, RSA_padding_add_none,
10       RSA_padding_check_none - asymmetric encryption padding
11

SYNOPSIS

13        #include <openssl/rsa.h>
14
15        int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
16           unsigned char *f, int fl);
17
18        int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
19           unsigned char *f, int fl, int rsa_len);
20
21        int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
22           unsigned char *f, int fl);
23
24        int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
25           unsigned char *f, int fl, int rsa_len);
26
27        int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
28           unsigned char *f, int fl, unsigned char *p, int pl);
29
30        int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
31           unsigned char *f, int fl, int rsa_len, unsigned char *p, int pl);
32
33        int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
34           unsigned char *f, int fl);
35
36        int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
37           unsigned char *f, int fl, int rsa_len);
38
39        int RSA_padding_add_none(unsigned char *to, int tlen,
40           unsigned char *f, int fl);
41
42        int RSA_padding_check_none(unsigned char *to, int tlen,
43           unsigned char *f, int fl, int rsa_len);
44

DESCRIPTION

46       The RSA_padding_xxx_xxx() functions are called from the RSA encrypt,
47       decrypt, sign and verify functions. Normally they should not be called
48       from application programs.
49
50       However, they can also be called directly to implement padding for
51       other asymmetric ciphers. RSA_padding_add_PKCS1_OAEP() and
52       RSA_padding_check_PKCS1_OAEP() may be used in an application combined
53       with RSA_NO_PADDING in order to implement OAEP with an encoding
54       parameter.
55
56       RSA_padding_add_xxx() encodes fl bytes from f so as to fit into tlen
57       bytes and stores the result at to. An error occurs if fl does not meet
58       the size requirements of the encoding method.
59
60       The following encoding methods are implemented:
61
62       PKCS1_type_1
63           PKCS #1 v2.0 EMSA-PKCS1-v1_5 (PKCS #1 v1.5 block type 1); used for
64           signatures
65
66       PKCS1_type_2
67           PKCS #1 v2.0 EME-PKCS1-v1_5 (PKCS #1 v1.5 block type 2)
68
69       PKCS1_OAEP
70           PKCS #1 v2.0 EME-OAEP
71
72       SSLv23
73           PKCS #1 EME-PKCS1-v1_5 with SSL-specific modification
74
75       none
76           simply copy the data
77
78       The random number generator must be seeded prior to calling
79       RSA_padding_add_xxx().
80
81       RSA_padding_check_xxx() verifies that the fl bytes at f contain a valid
82       encoding for a rsa_len byte RSA key in the respective encoding method
83       and stores the recovered data of at most tlen bytes (for
84       RSA_NO_PADDING: of size tlen) at to.
85
86       For RSA_padding_xxx_OAEP(), p points to the encoding parameter of
87       length pl. p may be NULL if pl is 0.
88

RETURN VALUES

90       The RSA_padding_add_xxx() functions return 1 on success, 0 on error.
91       The RSA_padding_check_xxx() functions return the length of the
92       recovered data, -1 on error. Error codes can be obtained by calling
93       ERR_get_error(3).
94

WARNING

96       The RSA_padding_check_PKCS1_type_2() padding check leaks timing
97       information which can potentially be used to mount a Bleichenbacher
98       padding oracle attack. This is an inherent weakness in the PKCS #1 v1.5
99       padding design. Prefer PKCS1_OAEP padding.
100

SEE ALSO

102       RSA_public_encrypt(3), RSA_private_decrypt(3), RSA_sign(3),
103       RSA_verify(3)
104

HISTORY

106       RSA_padding_add_PKCS1_type_1(), RSA_padding_check_PKCS1_type_1(),
107       RSA_padding_add_PKCS1_type_2(), RSA_padding_check_PKCS1_type_2(),
108       RSA_padding_add_SSLv23(), RSA_padding_check_SSLv23(),
109       RSA_padding_add_none() and RSA_padding_check_none() appeared in SSLeay
110       0.9.0.
111
112       RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() were
113       added in OpenSSL 0.9.2b.
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1171.0.2o                            2020-08-01   RSA_padding_add_PKCS1_type_1(3)
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