EVP_KDF_KRB5KDF - Online Linux Manual PageSection : 7
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEEVP_KDF_KRB5KDF − The RFC3961 Krb5 KDF EVP_KDF implementation
DESCRIPTIONSupport for computing the KRB5KDF KDF through the EVP_KDF API. The EVP_KDF_KRB5KDF algorithm implements the key derivation function defined in RFC 3961, section 5.1 and is used by Krb5 to derive session keys. Three inputs are required to perform key derivation: a cipher, (for example ​AES−128−CBC), the initial key, and a constant.
Numeric identity​EVP_KDF_KRB5KDF is the numeric identity for this implementation; it can be used with the ​EVP_KDF_CTX_new_id() function.
Supported controlsThe supported controls are: EVP_KDF_CTRL_SET_CIPHER EVP_KDF_CTRL_SET_KEY These controls work as described in ‟CONTROLS” in EVP_KDF_CTX (3). EVP_KDF_CTRL_SET_KRB5KDF_CONSTANT This control expects two arguments: unsigned char *constant, size_t constantlen This control sets the constant value for the KDF. If a value is already set, the contents are replaced.
NOTESA context for KRB5KDF can be obtained by calling: ​ EVP_KDF_CTX *kctx = EVP_KDF_CTX_new_id(EVP_KDF_KRB5KDF); The output length of the KRB5KDF derivation is specified via the keylen parameter to the EVP_KDF_derive (3) function, and MUST match the key length for the chosen cipher or an error is returned. Moreover the ​constant's length must not exceed the block size of the cipher. Since the KRB5KDF output length depends on the chosen cipher, calling ​EVP_KDF_size() to obtain the requisite length returns the correct length only after the cipher is set. Prior to that EVP_MAX_KEY_LENGTH is returned. The caller must allocate a buffer of the correct length for the chosen cipher, and pass that buffer to the EVP_KDF_derive (3) function along with that length.
EXAMPLESThis example derives a key using the AES−128−CBC cipher: ​ EVP_KDF_CTX *kctx; ​ unsigned char key[16] = "01234..."; ​ unsigned char constant[] = "I'm a constant"; ​ unsigned char out[16]; ​ size_t outlen = sizeof(out); ​ ​ kctx = EVP_KDF_CTX_new_id(EVP_KDF_KRB5KDF); ​ ​ EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_CIPHER, EVP_aes_128_cbc()); ​ EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KEY, key, (size_t)16); ​ EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KRB5KDF_CONSTANT, constant, strlen(constant)); ​ if (EVP_KDF_derive(kctx, out, outlen) <= 0) ​ /* Error */ ​ EVP_KDF_CTX_free(kctx);
CONFORMING TO​RFC 3961
SEE ALSO​EVP_KDF_CTX (3), ​EVP_KDF_CTX_new_id (3), ​EVP_KDF_CTX_free (3), ​EVP_KDF_ctrl (3), ​EVP_KDF_size (3), ​EVP_KDF_derive (3), ​‟CONTROLS” in EVP_KDF_CTX (3)
HISTORYThis functionality was added to OpenSSL 3.0.
COPYRIGHTCopyright 2016−2019 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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