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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 .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 \&\fIEVP_PKEY_new\fR\|(3). EVP_PKEYs can be associated with a private key of a particular algorithm by using the functions described on the \fIEVP_PKEY_set1_RSA\fR\|(3) page, or new keys can be generated using \fIEVP_PKEY_keygen\fR\|(3). EVP_PKEYs can be compared using \fIEVP_PKEY_cmp\fR\|(3), or printed using \&\fIEVP_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 \fIEVP_PKEY_derive\fR\|(3)" 4 .IX Item "For key agreement see EVP_PKEY_derive" .PD 0 .IP "For signing and verifying see \fIEVP_PKEY_sign\fR\|(3), \fIEVP_PKEY_verify\fR\|(3) and \fIEVP_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 \fIEVP_PKEY_encrypt\fR\|(3) and \fIEVP_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 \fIEVP_PKEY_encrypt\fR\|(3) and \fIEVP_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 \fIEVP_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).