kcapi_akcipher_setkey — set the private key for the cipher handle
int kcapi_akcipher_setkey ( | struct kcapi_handle * handle, |
| const uint8_t * key, | |
uint32_t keylen); |
handle[in] cipher handle
key[in] key buffer in DER format
keylen[in] length of key buffer
With this function, the caller sets the key for subsequent cipher operations.
The key must be in DER format as follows
SEQUENCE { version INTEGER, n INTEGER ({ rsa_get_n }), e INTEGER ({ rsa_get_e }), d INTEGER ({ rsa_get_d }), prime1 INTEGER, prime2 INTEGER, exponent1 INTEGER, exponent2 INTEGER, coefficient INTEGER }
After the caller provided the key, the caller may securely destroy the key as it is now maintained by the kernel.
return upon success the value of the maximum size for the asymmetric
operation is returned (e.g. the modulus size);
a negative errno-style error code if an error occurred