1KCAPI_KPP_SETKEY(3)          Programming Interface         KCAPI_KPP_SETKEY(3)
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NAME

6       kcapi_kpp_setkey - set the private key of the DH / ECDH operation
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SYNOPSIS

9       int kcapi_kpp_setkey(struct kcapi_handle * handle, const uint8_t * key,
10                            uint32_t keylen);
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ARGUMENTS

13       handle
14           [in] cipher handle
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16       key
17           [in] key buffer
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19       keylen
20           [in] length of key buffer
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DESCRIPTION

23       With this function, the caller sets the key for subsequent DH / ECDH
24       public key generation or shared secret generation operations.
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26       If the key / keylen is zero, the kernel tries to generate the private
27       key itself and retains it internally. This is useful if the DH / ECDH
28       operation shall be performed on ephemeral keys where the caller is only
29       interested in eventually obtain the shared secret.
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31       After the caller provided the key, the caller may securely destroy the
32       key as it is now maintained by the kernel.
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34       Note, the key can only be set after the DH parameters or the ECC curve
35       has been set.
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37       return in case of success a positive integer is returned that
38       denominates the maximum output size of the cryptographic operation --
39       this value must be used as the size of the output buffer for one
40       cryptographic operation); a negative errno-style error code if an error
41       occurred -- the error -EOPNOTSUPP is returned in case a
42       kernel-triggered private key generation is requested, but the
43       underlying cipher implementation does not support this operation.
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AUTHOR

46       Stephan Mueller <smueller@chronox.de>
47           Author.
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50libkcapi Manual 1.1.5             August 2019              KCAPI_KPP_SETKEY(3)
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