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therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.
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.. .nr rF 0 . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================
Title "RSA_PADDING_ADD_PKCS1_TYPE_1 3"
way too many mistakes in technical documents.
The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):
.Vb 2 int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, const unsigned char *f, int fl); \& int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen, const unsigned char *f, int fl, int rsa_len); \& int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, const unsigned char *f, int fl); \& int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen, const unsigned char *f, int fl, int rsa_len); \& int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen, const unsigned char *f, int fl, const unsigned char *p, int pl); \& int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen, const unsigned char *f, int fl, int rsa_len, const unsigned char *p, int pl); \& int RSA_padding_add_PKCS1_OAEP_mgf1(unsigned char *to, int tlen, const unsigned char *f, int fl, const unsigned char *p, int pl, const EVP_MD *md, const EVP_MD *mgf1md); \& int RSA_padding_check_PKCS1_OAEP_mgf1(unsigned char *to, int tlen, const unsigned char *f, int fl, int rsa_len, const unsigned char *p, int pl, const EVP_MD *md, const EVP_MD *mgf1md); \& int RSA_padding_add_none(unsigned char *to, int tlen, const unsigned char *f, int fl); \& int RSA_padding_check_none(unsigned char *to, int tlen, const unsigned char *f, int fl, int rsa_len); .Ve
The RSA_padding_xxx_xxx() functions are called from the \s-1RSA\s0 encrypt, decrypt, sign and verify functions. Normally they should not be called from application programs.
However, they can also be called directly to implement padding for other asymmetric ciphers. RSA_padding_add_PKCS1_OAEP() and \fBRSA_padding_check_PKCS1_OAEP() may be used in an application combined with \s-1RSA_NO_PADDING\s0 in order to implement \s-1OAEP\s0 with an encoding parameter.
\fBRSA_padding_add_xxx() encodes fl bytes from f so as to fit into \fBtlen bytes and stores the result at to. An error occurs if fl does not meet the size requirements of the encoding method.
The following encoding methods are implemented:
The random number generator must be seeded prior to calling \fBRSA_padding_add_xxx(). If the automatic seeding or reseeding of the OpenSSL \s-1CSPRNG\s0 fails due to external circumstances (see \s-1RAND\s0\|(7)), the operation will fail.
\fBRSA_padding_check_xxx() verifies that the fl bytes at f contain a valid encoding for a rsa_len byte \s-1RSA\s0 key in the respective encoding method and stores the recovered data of at most tlen bytes (for \s-1RSA_NO_PADDING\s0: of size tlen) at to.
For RSA_padding_xxx_OAEP(), p points to the encoding parameter of length pl. p may be \s-1NULL\s0 if pl is 0.
For RSA_padding_xxx_OAEP_mgf1(), md points to the md hash, if md is \s-1NULL\s0 that means md=sha1, and mgf1md points to the mgf1 hash, if mgf1md is \s-1NULL\s0 that means mgf1md=md.
Licensed under the Apache License 2.0 (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>.