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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" evp \- high\-level cryptographic functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \s-1EVP\s0 library provides a high-level interface to cryptographic functions. .PP \&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR provide public key encryption and decryption to implement digital \(L"envelopes\*(R". .PP The \fBEVP_DigestSign\fR\fI...\fR and \&\fBEVP_DigestVerify\fR\fI...\fR functions implement digital signatures and Message Authentication Codes (MACs). Also see the older \&\fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR functions. .PP Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR functions. The \fBEVP_Digest\fR\fI...\fR functions provide message digests. .PP The \fB\s-1EVP_PKEY\s0\fR\fI...\fR functions provide a high level interface to asymmetric algorithms. To create a new \s-1EVP_PKEY\s0 see \&\fBEVP_PKEY_new\fR\\|(3). EVP_PKEYs can be associated with a private key of a particular algorithm by using the functions described on the \fBEVP_PKEY_set1_RSA\fR\\|(3) page, or new keys can be generated using \fBEVP_PKEY_keygen\fR\\|(3). EVP_PKEYs can be compared using \fBEVP_PKEY_cmp\fR\\|(3), or printed using \&\fBEVP_PKEY_print_private\fR\\|(3). .PP The \s-1EVP_PKEY\s0 functions support the full range of asymmetric algorithm operations: .IP "For key agreement see \fBEVP_PKEY_derive\fR\\|(3)" 4 .IX Item "For key agreement see EVP_PKEY_derive" .PD 0 .IP "For signing and verifying see \fBEVP_PKEY_sign\fR\\|(3), \fBEVP_PKEY_verify\fR\\|(3) and \fBEVP_PKEY_verify_recover\fR\\|(3). However, note that these functions do not perform a digest of the data to be signed. Therefore normally you would use the \fBEVP_DigestSign\fR\fI...\fR functions for this purpose." 4 .IX Item "For signing and verifying see EVP_PKEY_sign, EVP_PKEY_verify and EVP_PKEY_verify_recover. However, note that these functions do not perform a digest of the data to be signed. Therefore normally you would use the EVP_DigestSign... functions for this purpose." .ie n .IP "For encryption and decryption see \fBEVP_PKEY_encrypt\fR\\|(3) and \fBEVP_PKEY_decrypt\fR\\|(3) respectively. However, note that these functions perform encryption and decryption only. As public key encryption is an expensive operation, normally you would wrap an encrypted message in a ""digital envelope"" using the \fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR functions." 4 .el .IP "For encryption and decryption see \fBEVP_PKEY_encrypt\fR\\|(3) and \fBEVP_PKEY_decrypt\fR\\|(3) respectively. However, note that these functions perform encryption and decryption only. As public key encryption is an expensive operation, normally you would wrap an encrypted message in a ``digital envelope'' using the \fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR functions." 4 .IX Item "For encryption and decryption see EVP_PKEY_encrypt and EVP_PKEY_decrypt respectively. However, note that these functions perform encryption and decryption only. As public key encryption is an expensive operation, normally you would wrap an encrypted message in a digital envelope using the EVP_Seal... and EVP_Open... functions." .PD .PP The \fBEVP_BytesToKey\fR\\|(3) function provides some limited support for password based encryption. Careful selection of the parameters will provide a PKCS#5 \s-1PBKDF1\s0 compatible implementation. However, new applications should not typically use this (preferring, for example, \&\s-1PBKDF2\s0 from PCKS#5). .PP The \fBEVP_Encode\fR\fI...\fR and \&\fBEVP_Decode\fR\fI...\fR functions implement base 64 encoding and decoding. .PP Algorithms are loaded with \fBOpenSSL_add_all_algorithms\fR\\|(3). .PP All the symmetric algorithms (ciphers), digests and asymmetric algorithms (public key algorithms) can be replaced by \s-1ENGINE\s0 modules providing alternative implementations. If \s-1ENGINE\s0 implementations of ciphers or digests are registered as defaults, then the various \s-1EVP\s0 functions will automatically use those implementations automatically in preference to built in software implementations. For more information, consult the \fBengine\fR\\|(3) man page. .PP Although low level algorithm specific functions exist for many algorithms their use is discouraged. They cannot be used with an \s-1ENGINE\s0 and \s-1ENGINE\s0 versions of new algorithms cannot be accessed using the low level functions. Also makes code harder to adapt to new algorithms and some options are not cleanly supported at the low level and some operations are more efficient using the high level interface. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_DigestInit\fR\\|(3), \&\fBEVP_EncryptInit\fR\\|(3), \&\fBEVP_OpenInit\fR\\|(3), \&\fBEVP_SealInit\fR\\|(3), \&\fBEVP_DigestSignInit\fR\\|(3), \&\fBEVP_SignInit\fR\\|(3), \&\fBEVP_VerifyInit\fR\\|(3), \&\fBEVP_EncodeInit\fR\\|(3), \&\fBEVP_PKEY_new\fR\\|(3), \&\fBEVP_PKEY_set1_RSA\fR\\|(3), \&\fBEVP_PKEY_keygen\fR\\|(3), \&\fBEVP_PKEY_print_private\fR\\|(3), \&\fBEVP_PKEY_decrypt\fR\\|(3), \&\fBEVP_PKEY_encrypt\fR\\|(3), \&\fBEVP_PKEY_sign\fR\\|(3), \&\fBEVP_PKEY_verify\fR\\|(3), \&\fBEVP_PKEY_verify_recover\fR\\|(3), \&\fBEVP_PKEY_derive\fR\\|(3), \&\fBEVP_BytesToKey\fR\\|(3), \&\fBOpenSSL_add_all_algorithms\fR\\|(3), \&\fBengine\fR\\|(3) Back

Edit File : evp.3ssl | Size : 9.01 KB

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.\" ========================================================================
.\"
.IX Title "evp 3"
.TH evp 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
evp \- high\-level cryptographic functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1EVP\s0 library provides a high-level interface to cryptographic
functions.
.PP
\&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR
provide public key encryption and decryption to implement digital \*(L"envelopes\*(R".
.PP
The \fBEVP_DigestSign\fR\fI...\fR and
\&\fBEVP_DigestVerify\fR\fI...\fR functions implement
digital signatures and Message Authentication Codes (MACs). Also see the older
\&\fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR
functions.
.PP
Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR
functions.  The \fBEVP_Digest\fR\fI...\fR functions provide message digests.
.PP
The \fB\s-1EVP_PKEY\s0\fR\fI...\fR functions provide a high level interface to
asymmetric algorithms. To create a new \s-1EVP_PKEY\s0 see
\&\fBEVP_PKEY_new\fR\|(3). EVP_PKEYs can be associated
with a private key of a particular algorithm by using the functions
described on the \fBEVP_PKEY_set1_RSA\fR\|(3) page, or
new keys can be generated using \fBEVP_PKEY_keygen\fR\|(3).
EVP_PKEYs can be compared using \fBEVP_PKEY_cmp\fR\|(3), or printed using
\&\fBEVP_PKEY_print_private\fR\|(3).
.PP
The \s-1EVP_PKEY\s0 functions support the full range of asymmetric algorithm operations:
.IP "For key agreement see \fBEVP_PKEY_derive\fR\|(3)" 4
.IX Item "For key agreement see EVP_PKEY_derive"
.PD 0
.IP "For signing and verifying see \fBEVP_PKEY_sign\fR\|(3), \fBEVP_PKEY_verify\fR\|(3) and \fBEVP_PKEY_verify_recover\fR\|(3). However, note that these functions do not perform a digest of the data to be signed. Therefore normally you would use the \fBEVP_DigestSign\fR\fI...\fR functions for this purpose." 4
.IX Item "For signing and verifying see EVP_PKEY_sign, EVP_PKEY_verify and EVP_PKEY_verify_recover. However, note that these functions do not perform a digest of the data to be signed. Therefore normally you would use the EVP_DigestSign... functions for this purpose."
.ie n .IP "For encryption and decryption see \fBEVP_PKEY_encrypt\fR\|(3) and \fBEVP_PKEY_decrypt\fR\|(3) respectively. However, note that these functions perform encryption and decryption only. As public key encryption is an expensive operation, normally you would wrap an encrypted message in a ""digital envelope"" using the \fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR functions." 4
.el .IP "For encryption and decryption see \fBEVP_PKEY_encrypt\fR\|(3) and \fBEVP_PKEY_decrypt\fR\|(3) respectively. However, note that these functions perform encryption and decryption only. As public key encryption is an expensive operation, normally you would wrap an encrypted message in a ``digital envelope'' using the \fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR functions." 4
.IX Item "For encryption and decryption see EVP_PKEY_encrypt and EVP_PKEY_decrypt respectively. However, note that these functions perform encryption and decryption only. As public key encryption is an expensive operation, normally you would wrap an encrypted message in a digital envelope using the EVP_Seal... and EVP_Open... functions."
.PD
.PP
The \fBEVP_BytesToKey\fR\|(3) function provides some limited support for password
based encryption. Careful selection of the parameters will provide a PKCS#5 \s-1PBKDF1\s0 compatible
implementation. However, new applications should not typically use this (preferring, for example,
\&\s-1PBKDF2\s0 from PCKS#5).
.PP
The \fBEVP_Encode\fR\fI...\fR and
\&\fBEVP_Decode\fR\fI...\fR functions implement base 64 encoding
and decoding.
.PP
Algorithms are loaded with \fBOpenSSL_add_all_algorithms\fR\|(3).
.PP
All the symmetric algorithms (ciphers), digests and asymmetric algorithms
(public key algorithms) can be replaced by \s-1ENGINE\s0 modules providing alternative
implementations. If \s-1ENGINE\s0 implementations of ciphers or digests are registered
as defaults, then the various \s-1EVP\s0 functions will automatically use those
implementations automatically in preference to built in software
implementations. For more information, consult the \fBengine\fR\|(3) man page.
.PP
Although low level algorithm specific functions exist for many algorithms
their use is discouraged. They cannot be used with an \s-1ENGINE\s0 and \s-1ENGINE\s0
versions of new algorithms cannot be accessed using the low level functions.
Also makes code harder to adapt to new algorithms and some options are not 
cleanly supported at the low level and some operations are more efficient
using the high level interface.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_DigestInit\fR\|(3),
\&\fBEVP_EncryptInit\fR\|(3),
\&\fBEVP_OpenInit\fR\|(3),
\&\fBEVP_SealInit\fR\|(3),
\&\fBEVP_DigestSignInit\fR\|(3),
\&\fBEVP_SignInit\fR\|(3),
\&\fBEVP_VerifyInit\fR\|(3),
\&\fBEVP_EncodeInit\fR\|(3),
\&\fBEVP_PKEY_new\fR\|(3),
\&\fBEVP_PKEY_set1_RSA\fR\|(3),
\&\fBEVP_PKEY_keygen\fR\|(3),
\&\fBEVP_PKEY_print_private\fR\|(3),
\&\fBEVP_PKEY_decrypt\fR\|(3),
\&\fBEVP_PKEY_encrypt\fR\|(3),
\&\fBEVP_PKEY_sign\fR\|(3),
\&\fBEVP_PKEY_verify\fR\|(3),
\&\fBEVP_PKEY_verify_recover\fR\|(3),
\&\fBEVP_PKEY_derive\fR\|(3),
\&\fBEVP_BytesToKey\fR\|(3),
\&\fBOpenSSL_add_all_algorithms\fR\|(3),
\&\fBengine\fR\|(3)

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