428 lines
15 KiB
Groff
428 lines
15 KiB
Groff
.rn '' }`
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.de Sh
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.br
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.de Sp
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.tm Index:\\$1\t\\n%\t"\\$2"
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..
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.nr % 0
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.rr F
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.\}
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.TH EVP_EncryptInit 3 "0.9.5a" "22/Jul/100" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.de CQ \" put $1 in typewriter font
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.ft CW
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'if n "\c
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'if t \\&\\$1\c
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'if n \\&\\$1\c
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'if n \&"
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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. \" fudge factors for nroff and troff
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.\}
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.if t \{\
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. ds #V .6m
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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EVP_EncryptInit, EVP_EncryptUpdate, EVP_EncryptFinal \- EVP cipher routines
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/evp.h>
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.Ve
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.Vb 6
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\& void EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
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\& unsigned char *key, unsigned char *iv);
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\& void EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl, unsigned char *in, int inl);
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\& void EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl);
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.Ve
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.Vb 6
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\& void EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
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\& unsigned char *key, unsigned char *iv);
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\& void EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl, unsigned char *in, int inl);
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\& int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *outm,
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\& int *outl);
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.Ve
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.Vb 6
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\& void EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
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\& unsigned char *key, unsigned char *iv, int enc);
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\& void EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl, unsigned char *in, int inl);
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\& int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *outm,
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\& int *outl);
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.Ve
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.Vb 1
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\& void EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *a);
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.Ve
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.Vb 3
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\& const EVP_CIPHER *EVP_get_cipherbyname(const char *name);
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\& #define EVP_get_cipherbynid(a) EVP_get_cipherbyname(OBJ_nid2sn(a))
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\& #define EVP_get_cipherbyobj(a) EVP_get_cipherbynid(OBJ_obj2nid(a))
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.Ve
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.Vb 4
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\& #define EVP_CIPHER_nid(e) ((e)->nid)
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\& #define EVP_CIPHER_block_size(e) ((e)->block_size)
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\& #define EVP_CIPHER_key_length(e) ((e)->key_len)
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\& #define EVP_CIPHER_iv_length(e) ((e)->iv_len)
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.Ve
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.Vb 7
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\& int EVP_CIPHER_type(const EVP_CIPHER *ctx);
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\& #define EVP_CIPHER_CTX_cipher(e) ((e)->cipher)
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\& #define EVP_CIPHER_CTX_nid(e) ((e)->cipher->nid)
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\& #define EVP_CIPHER_CTX_block_size(e) ((e)->cipher->block_size)
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\& #define EVP_CIPHER_CTX_key_length(e) ((e)->cipher->key_len)
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\& #define EVP_CIPHER_CTX_iv_length(e) ((e)->cipher->iv_len)
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\& #define EVP_CIPHER_CTX_type(c) EVP_CIPHER_type(EVP_CIPHER_CTX_cipher(c))
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.Ve
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.Vb 2
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\& int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
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\& int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
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.Ve
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.SH "DESCRIPTION"
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The EVP cipher routines are a high level interface to certain
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symmetric ciphers.
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.PP
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\fIEVP_EncryptInit()\fR initialises a cipher context \fBctx\fR for encryption
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with cipher \fBtype\fR. \fBtype\fR is normally supplied by a function such
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as \fIEVP_des_cbc()\fR . \fBkey\fR is the symmetric key to use and \fBiv\fR is the
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IV to use (if necessary), the actual number of bytes used for the
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key and IV depends on the cipher. It is possible to set all parameters
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to NULL except \fBtype\fR in an initial call and supply the remaining
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parameters in subsequent calls. This is normally done when the
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\fIEVP_CIPHER_asn1_to_param()\fR function is called to set the cipher
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parameters from an ASN1 AlgorithmIdentifier and the key from a
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different source.
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.PP
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\fIEVP_EncryptUpdate()\fR encrypts \fBinl\fR bytes from the buffer \fBin\fR and
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writes the encrypted version to \fBout\fR. This function can be called
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multiple times to encrypt successive blocks of data. The amount
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of data written depends on the block alignment of the encrypted data:
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as a result the amount of data written may be anything from zero bytes
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to (inl + cipher_block_size \- 1) so \fBoutl\fR should contain sufficient
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room. The actual number of bytes written is placed in \fBoutl\fR.
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.PP
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\fIEVP_EncryptFinal()\fR encrypts the \*(L"final\*(R" data, that is any data that
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remains in a partial block. It uses the \f(CWNOTES\fR entry in the \fIstandard block padding|\fR manpage (aka PKCS
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padding). The encrypted final data is written to \fBout\fR which should
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have sufficient space for one cipher block. The number of bytes written
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is placed in \fBoutl\fR. After this function is called the encryption operation
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is finished and no further calls to \fIEVP_EncryptUpdate()\fR should be made.
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.PP
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\fIEVP_DecryptInit()\fR, \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR are the
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corresponding decryption operations. \fIEVP_DecryptFinal()\fR will return an
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error code if the final block is not correctly formatted. The parameters
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and restrictions are identical to the encryption operations except that
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the decrypted data buffer \fBout\fR passed to \fIEVP_DecryptUpdate()\fR should
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have sufficient room for (\fBinl\fR + cipher_block_size) bytes unless the
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cipher block size is 1 in which case \fBinl\fR bytes is sufficient.
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.PP
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\fIEVP_CipherInit()\fR, \fIEVP_CipherUpdate()\fR and \fIEVP_CipherFinal()\fR are functions
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that can be used for decryption or encryption. The operation performed
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depends on the value of the \fBenc\fR parameter. It should be set to 1 for
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encryption and 0 for decryption.
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.PP
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\fIEVP_CIPHER_CTX_cleanup()\fR clears all information from a cipher context.
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It should be called after all operations using a cipher are complete
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so sensitive information does not remain in memory.
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.PP
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\fIEVP_get_cipherbyname()\fR, \fIEVP_get_cipherbynid()\fR and \fIEVP_get_cipherbyobj()\fR
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return an EVP_CIPHER structure when passed a cipher name, a NID or an
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ASN1_OBJECT structure.
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.PP
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\fIEVP_CIPHER_nid()\fR and \fIEVP_CIPHER_CTX_nid()\fR return the NID of a cipher when
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passed an \fBEVP_CIPHER\fR or \fBEVP_CIPHER_CTX\fR structure. The actual NID
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value is an internal value which may not have a corresponding OBJECT
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IDENTIFIER.
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.PP
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\fIEVP_CIPHER_key_length()\fR and \fIEVP_CIPHER_CTX_key_length()\fR return the key
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length of a cipher when passed an \fBEVP_CIPHER\fR or \fBEVP_CIPHER_CTX\fR
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structure. The constant \fBEVP_MAX_KEY_LENGTH\fR is the maximum key length
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for all ciphers.
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.PP
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\fIEVP_CIPHER_iv_length()\fR and \fIEVP_CIPHER_CTX_iv_length()\fR return the IV
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length of a cipher when passed an \fBEVP_CIPHER\fR or \fBEVP_CIPHER_CTX\fR.
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It will return zero if the cipher does not use an IV. The constant
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\fBEVP_MAX_IV_LENGTH\fR is the maximum IV length for all ciphers.
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.PP
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\fIEVP_CIPHER_block_size()\fR and \fIEVP_CIPHER_CTX_block_size()\fR return the block
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size of a cipher when passed an \fBEVP_CIPHER\fR or \fBEVP_CIPHER_CTX\fR
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structure. The constant \fBEVP_MAX_IV_LENGTH\fR is also the maximum block
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length for all ciphers.
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.PP
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\fIEVP_CIPHER_type()\fR and \fIEVP_CIPHER_CTX_type()\fR return the type of the passed
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cipher or context. This \*(L"type\*(R" is the actual NID of the cipher OBJECT
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IDENTIFIER as such it ignores the cipher parameters and 40 bit RC2 and
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128 bit RC2 have the same NID. If the cipher does not have an object
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identifier or does not have ASN1 support this function will return
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\fBNID_undef\fR.
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.PP
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\fIEVP_CIPHER_CTX_cipher()\fR returns the \fBEVP_CIPHER\fR structure when passed
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an \fBEVP_CIPHER_CTX\fR structure.
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.PP
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\fIEVP_CIPHER_param_to_asn1()\fR sets the AlgorithmIdentifier \*(L"parameter\*(R" based
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on the passed cipher. This will typically include any parameters and an
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IV. The cipher IV (if any) must be set when this call is made. This call
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should be made before the cipher is actually \*(L"used\*(R" (before any
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\fIEVP_EncryptUpdate()\fR, \fIEVP_DecryptUpdate()\fR calls for example). This function
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may fail if the cipher does not have any ASN1 support.
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.PP
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\fIEVP_CIPHER_asn1_to_param()\fR sets the cipher parameters based on an ASN1
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AlgorithmIdentifier \*(L"parameter\*(R". The precise effect depends on the cipher
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In the case of RC2, for example, it will set the IV and effective key length.
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This function should be called after the base cipher type is set but before
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the key is set. For example \fIEVP_CipherInit()\fR will be called with the IV and
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key set to NULL, \fIEVP_CIPHER_asn1_to_param()\fR will be called and finally
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\fIEVP_CipherInit()\fR again with all parameters except the key set to NULL. It is
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possible for this function to fail if the cipher does not have any ASN1 support
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or the parameters cannot be set (for example the RC2 effective key length
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does not have an \fBEVP_CIPHER\fR structure).
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.SH "RETURN VALUES"
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\fIEVP_EncryptInit()\fR, \fIEVP_EncryptUpdate()\fR and \fIEVP_EncryptFinal()\fR do not return
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values.
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.PP
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\fIEVP_DecryptInit()\fR and \fIEVP_DecryptUpdate()\fR do not return values.
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\fIEVP_DecryptFinal()\fR returns 0 if the decrypt failed or 1 for success.
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.PP
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\fIEVP_CipherInit()\fR and \fIEVP_CipherUpdate()\fR do not return values.
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\fIEVP_CipherFinal()\fR returns 1 for a decryption failure or 1 for success, if
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the operation is encryption then it always returns 1.
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.PP
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\fIEVP_CIPHER_CTX_cleanup()\fR does not return a value.
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.PP
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\fIEVP_get_cipherbyname()\fR, \fIEVP_get_cipherbynid()\fR and \fIEVP_get_cipherbyobj()\fR
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return an \fBEVP_CIPHER\fR structure or NULL on error.
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.PP
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\fIEVP_CIPHER_nid()\fR and \fIEVP_CIPHER_CTX_nid()\fR return a NID.
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.PP
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\fIEVP_CIPHER_block_size()\fR and \fIEVP_CIPHER_CTX_block_size()\fR return the block
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size.
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.PP
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\fIEVP_CIPHER_key_length()\fR and \fIEVP_CIPHER_CTX_key_length()\fR return the key
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length.
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.PP
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\fIEVP_CIPHER_iv_length()\fR and \fIEVP_CIPHER_CTX_iv_length()\fR return the IV
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length or zero if the cipher does not use an IV.
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.PP
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\fIEVP_CIPHER_type()\fR and \fIEVP_CIPHER_CTX_type()\fR return the NID of the cipher's
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OBJECT IDENTIFIER or NID_undef if it has no defined OBJECT IDENTIFIER.
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.PP
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\fIEVP_CIPHER_CTX_cipher()\fR returns an \fBEVP_CIPHER\fR structure.
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.PP
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\fIEVP_CIPHER_param_to_asn1()\fR and \fIEVP_CIPHER_asn1_to_param()\fR return 1 for
|
|
success or zero for failure.
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.SH "NOTES"
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|
Where possible the \fBEVP\fR interface to symmetric ciphers should be used in
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|
preference to the low level interfaces. This is because the code then becomes
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|
transparent to the cipher used and much more flexible.
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.PP
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|
PKCS padding works by adding \fBn\fR padding bytes of value \fBn\fR to make the total
|
|
length of the encrypted data a multiple of the block size. Padding is always
|
|
added so if the data is already a multiple of the block size \fBn\fR will equal
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|
the block size. For example if the block size is 8 and 11 bytes are to be
|
|
encrypted then 5 padding bytes of value 5 will be added.
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|
.PP
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|
When decrypting the final block is checked to see if it has the correct form.
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|
.PP
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|
Although the decryption operation can produce an error, it is not a strong
|
|
test that the input data or key is correct. A random block has better than
|
|
1 in 256 chance of being of the correct format and problems with the
|
|
input data earlier on will not produce a final decrypt error.
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|
.SH "BUGS"
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|
The current \fBEVP\fR cipher interface is not as flexible as it should be. Only
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|
certain \*(L"spot\*(R" encryption algorithms can be used for ciphers which have various
|
|
parameters associated with them (RC2, RC5 for example) this is inadequate.
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|
.PP
|
|
Several of the functions do not return error codes because the software versions
|
|
can never fail. This is not true of hardware versions.
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|
.SH "SEE ALSO"
|
|
the \fIevp(3)|evp(3)\fR manpage
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|
.SH "HISTORY"
|
|
|
|
.rn }` ''
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|
.IX Title "EVP_EncryptInit 3"
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|
.IX Name "EVP_EncryptInit, EVP_EncryptUpdate, EVP_EncryptFinal - EVP cipher routines"
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|
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|
.IX Header "NAME"
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|
.IX Header "SYNOPSIS"
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|
.IX Header "DESCRIPTION"
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|
.IX Header "RETURN VALUES"
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|
.IX Header "NOTES"
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|
.IX Header "BUGS"
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|
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|
.IX Header "SEE ALSO"
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|
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|
.IX Header "HISTORY"
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|