1RSA_padding_add_PKCS1_type_1(3)     OpenSSL    RSA_padding_add_PKCS1_type_1(3)
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NAME

6       RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1, RSA_pad‐
7       ding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2, RSA_pad‐
8       ding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP, RSA_pad‐
9       ding_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);
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42        int RSA_padding_check_none(unsigned char *to, int tlen,
43           unsigned char *f, int fl, int rsa_len);
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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 RSA_pad‐
52       ding_check_PKCS1_OAEP() may be used in an application combined with
53       RSA_NO_PADDING in order to implement OAEP with an encoding parameter.
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55       RSA_padding_add_xxx() encodes fl bytes from f so as to fit into tlen
56       bytes and stores the result at to. An error occurs if fl does not meet
57       the size requirements of the encoding method.
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59       The following encoding methods are implemented:
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61       PKCS1_type_1
62           PKCS #1 v2.0 EMSA-PKCS1-v1_5 (PKCS #1 v1.5 block type 1); used for
63           signatures
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65       PKCS1_type_2
66           PKCS #1 v2.0 EME-PKCS1-v1_5 (PKCS #1 v1.5 block type 2)
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68       PKCS1_OAEP
69           PKCS #1 v2.0 EME-OAEP
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71       SSLv23
72           PKCS #1 EME-PKCS1-v1_5 with SSL-specific modification
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74       none
75           simply copy the data
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77       The random number generator must be seeded prior to calling RSA_pad‐
78       ding_add_xxx().
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80       RSA_padding_check_xxx() verifies that the fl bytes at f contain a valid
81       encoding for a rsa_len byte RSA key in the respective encoding method
82       and stores the recovered data of at most tlen bytes (for RSA_NO_PAD‐
83       DING: of size tlen) at to.
84
85       For RSA_padding_xxx_OAEP(), p points to the encoding parameter of
86       length pl. p may be NULL if pl is 0.
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RETURN VALUES

89       The RSA_padding_add_xxx() functions return 1 on success, 0 on error.
90       The RSA_padding_check_xxx() functions return the length of the recov‐
91       ered data, -1 on error. Error codes can be obtained by calling
92       ERR_get_error(3).
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SEE ALSO

95       RSA_public_encrypt(3), RSA_private_decrypt(3), RSA_sign(3), RSA_ver‐
96       ify(3)
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HISTORY

99       RSA_padding_add_PKCS1_type_1(), RSA_padding_check_PKCS1_type_1(),
100       RSA_padding_add_PKCS1_type_2(), RSA_padding_check_PKCS1_type_2(),
101       RSA_padding_add_SSLv23(), RSA_padding_check_SSLv23(), RSA_pad‐
102       ding_add_none() and RSA_padding_check_none() appeared in SSLeay 0.9.0.
103
104       RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() were
105       added in OpenSSL 0.9.2b.
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1090.9.8b                            2000-02-24   RSA_padding_add_PKCS1_type_1(3)
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