1OSSL_DECODER_CTX_NEW_FOR_PKEY(3ossl)OpenSSLOSSL_DECODER_CTX_NEW_FOR_PKEY(3ossl)
2
6 OSSL_DECODER_CTX_new_for_pkey, OSSL_DECODER_CTX_set_passphrase,
7 OSSL_DECODER_CTX_set_pem_password_cb,
8 OSSL_DECODER_CTX_set_passphrase_ui, OSSL_DECODER_CTX_set_passphrase_cb
9 - Decoder routines to decode EVP_PKEYs
10
12 #include <openssl/decoder.h>
13 OSSL_DECODER_CTX *
15 OSSL_DECODER_CTX_new_for_pkey(EVP_PKEY **pkey,
16 const char *input_type,
17 const char *input_struct,
18 const char *keytype, int selection,
19 OSSL_LIB_CTX *libctx, const char *propquery);
20 int OSSL_DECODER_CTX_set_passphrase(OSSL_DECODER_CTX *ctx,
22 const unsigned char *kstr,
23 size_t klen);
24 int OSSL_DECODER_CTX_set_pem_password_cb(OSSL_DECODER_CTX *ctx,
25 pem_password_cb *cb,
26 void *cbarg);
27 int OSSL_DECODER_CTX_set_passphrase_ui(OSSL_DECODER_CTX *ctx,
28 const UI_METHOD *ui_method,
29 void *ui_data);
30 int OSSL_DECODER_CTX_set_passphrase_cb(OSSL_DECODER_CTX *ctx,
31 OSSL_PASSPHRASE_CALLBACK *cb,
32 void *cbarg);
33
35 OSSL_DECODER_CTX_new_for_pkey() is a utility function that creates a
36 OSSL_DECODER_CTX, finds all applicable decoder implementations and sets
37 them up, so all the caller has to do next is call functions like
38 OSSL_DECODER_from_bio(3). The caller may use the optional input_type,
39 input_struct, keytype and selection to specify what the input is
40 expected to contain. The pkey must reference an EVP_PKEY * variable
41 that will be set to the newly created EVP_PKEY on succesfull decoding.
42 The referenced variable must be initialized to NULL before calling the
43 function.
44 Internally OSSL_DECODER_CTX_new_for_pkey() searches for all available
46 EVP_KEYMGMT(3) implementations, and then builds a list of all potential
47 decoder implementations that may be able to process the encoded input
48 into data suitable for EVP_PKEYs. All these implementations are
49 implicitly fetched using libctx and propquery.
50 The search of decoder implementations can be limited with input_type
52 and input_struct which specifies a starting input type and input
53 structure. NULL is valid for both of them and signifies that the
54 decoder implementations will find out the input type on their own.
55 They are set with OSSL_DECODER_CTX_set_input_type(3) and
56 OSSL_DECODER_CTX_set_input_structure(3). See "Input Types" and "Input
57 Structures" below for further information.
58 The search of decoder implementations can also be limited with keytype
60 and selection, which specifies the expected resulting keytype and
61 contents. NULL and zero are valid and signify that the decoder
62 implementations will find out the keytype and key contents on their own
63 from the input they get.
64 If no suitable decoder implementation is found,
66 OSSL_DECODER_CTX_new_for_pkey() still creates a OSSL_DECODER_CTX, but
67 with no associated decoder (OSSL_DECODER_CTX_get_num_decoders(3)
68 returns zero). This helps the caller to distinguish between an error
69 when creating the OSSL_ENCODER_CTX and missing encoder implementation,
70 and allows it to act accordingly.
71 OSSL_DECODER_CTX_set_passphrase() gives the implementation a pass
73 phrase to use when decrypting the encoded private key. Alternatively, a
74 pass phrase callback may be specified with the following functions.
75 OSSL_DECODER_CTX_set_pem_password_cb(),
77 OSSL_DECODER_CTX_set_passphrase_ui() and
78 OSSL_DECODER_CTX_set_passphrase_cb() set up a callback method that the
79 implementation can use to prompt for a pass phrase, giving the caller
80 the choice of prefered pass phrase callback form. These are called
81 indirectly, through an internal OSSL_PASSPHRASE_CALLBACK function.
82 The internal OSSL_PASSPHRASE_CALLBACK function caches the pass phrase,
84 to be re-used in all decodings that are performed in the same decoding
85 run (for example, within one OSSL_DECODER_from_bio(3) call).
86 Input Types
88 Available input types depend on the implementations that available
89 providers offer, and provider documentation should have the details.
90 Among the known input types that OpenSSL decoder implementations offer
92 for EVP_PKEYs are "DER", "PEM", "MSBLOB" and "PVK". See
93 openssl-glossary(7) for further information on what these input types
94 mean.
95 Input Structures
97 Available input structures depend on the implementations that available
98 providers offer, and provider documentation should have the details.
99 Among the known input structures that OpenSSL decoder implementations
101 offer for EVP_PKEYs are "pkcs8" and "SubjectPublicKeyInfo".
102 OpenSSL decoder implementations also support the input structure
104 "type-specific". This is the structure used for keys encoded according
105 to key type specific specifications. For example, RSA keys encoded
106 according to PKCS#1.
107 Selections
109 selection can be any one of the values described in "Selections" in
110 EVP_PKEY_fromdata(3). Additionally selection can also be set to 0 to
111 indicate that the code will auto detect the selection.
112
114 OSSL_DECODER_CTX_new_for_pkey() returns a pointer to a
115 OSSL_DECODER_CTX, or NULL if it couldn't be created.
116 OSSL_DECODER_CTX_set_passphrase(),
118 OSSL_DECODER_CTX_set_pem_password_cb(),
119 OSSL_DECODER_CTX_set_passphrase_ui() and
120 OSSL_DECODER_CTX_set_passphrase_cb() all return 1 on success, or 0 on
121 failure.
122
124 provider(7), OSSL_DECODER(3), OSSL_DECODER_CTX(3)
125
127 The functions described here were added in OpenSSL 3.0.
128
130 Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
131 Licensed under the Apache License 2.0 (the "License"). You may not use
133 this file except in compliance with the License. You can obtain a copy
134 in the file LICENSE in the source distribution or at
135 <https://www.openssl.org/source/license.html>.
1363.0.5 2022-11-0O1SSL_DECODER_CTX_NEW_FOR_PKEY(3ossl)