222 lines
6.7 KiB
Groff
222 lines
6.7 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "EVP_PKEY_derive 3"
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.TH EVP_PKEY_derive 3 "2018-03-27" "1.0.2o" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_PKEY_derive_init, EVP_PKEY_derive_set_peer, EVP_PKEY_derive \- derive public key algorithm shared secret.
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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\&
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\& int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer);
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\& int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fIEVP_PKEY_derive_init()\fR function initializes a public key algorithm
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context using key \fBpkey\fR for shared secret derivation.
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.PP
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The \fIEVP_PKEY_derive_set_peer()\fR function sets the peer key: this will normally
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be a public key.
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.PP
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The \fIEVP_PKEY_derive()\fR derives a shared secret using \fBctx\fR.
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If \fBkey\fR is \fB\s-1NULL\s0\fR then the maximum size of the output buffer is written to
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the \fBkeylen\fR parameter. If \fBkey\fR is not \fB\s-1NULL\s0\fR then before the call the
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\&\fBkeylen\fR parameter should contain the length of the \fBkey\fR buffer, if the call
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is successful the shared secret is written to \fBkey\fR and the amount of data
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written to \fBkeylen\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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After the call to \fIEVP_PKEY_derive_init()\fR algorithm specific control
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operations can be performed to set any appropriate parameters for the
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operation.
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.PP
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The function \fIEVP_PKEY_derive()\fR can be called more than once on the same
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context if several operations are performed using the same parameters.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_PKEY_derive_init()\fR and \fIEVP_PKEY_derive()\fR return 1 for success and 0
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or a negative value for failure. In particular a return value of \-2
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indicates the operation is not supported by the public key algorithm.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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Derive shared secret (for example \s-1DH\s0 or \s-1EC\s0 keys):
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.PP
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.Vb 2
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\& #include <openssl/evp.h>
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\& #include <openssl/rsa.h>
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\&
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\& EVP_PKEY_CTX *ctx;
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\& unsigned char *skey;
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\& size_t skeylen;
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\& EVP_PKEY *pkey, *peerkey;
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\& /* NB: assumes pkey, peerkey have been already set up */
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\&
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\& ctx = EVP_PKEY_CTX_new(pkey);
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\& if (!ctx)
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\& /* Error occurred */
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\& if (EVP_PKEY_derive_init(ctx) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_derive_set_peer(ctx, peerkey) <= 0)
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\& /* Error */
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\&
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\& /* Determine buffer length */
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\& if (EVP_PKEY_derive(ctx, NULL, &skeylen) <= 0)
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\& /* Error */
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\&
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\& skey = OPENSSL_malloc(skeylen);
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\&
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\& if (!skey)
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\& /* malloc failure */
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\&
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\& if (EVP_PKEY_derive(ctx, skey, &skeylen) <= 0)
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\& /* Error */
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\&
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\& /* Shared secret is skey bytes written to buffer skey */
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_PKEY_CTX_new\fR\|(3),
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\&\fIEVP_PKEY_encrypt\fR\|(3),
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\&\fIEVP_PKEY_decrypt\fR\|(3),
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\&\fIEVP_PKEY_sign\fR\|(3),
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\&\fIEVP_PKEY_verify\fR\|(3),
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\&\fIEVP_PKEY_verify_recover\fR\|(3),
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.SH "HISTORY"
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.IX Header "HISTORY"
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These functions were first added to OpenSSL 1.0.0.
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