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90 lines
3.7 KiB
90 lines
3.7 KiB
/**********************************************************************
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* Copyright (c) 2014, 2015 Pieter Wuille *
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html*
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**********************************************************************/
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/****
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* Please do not link this file directly. It is not part of the libsecp256k1
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* project and does not promise any stability in its API, functionality or
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* presence. Projects which use this code should instead copy this header
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* and its accompanying .c file directly into their codebase.
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****/
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/* This file contains code snippets that parse DER private keys with
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* various errors and violations. This is not a part of the library
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* itself, because the allowed violations are chosen arbitrarily and
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* do not follow or establish any standard.
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*
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* It also contains code to serialize private keys in a compatible
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* manner.
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*
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* These functions are meant for compatibility with applications
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* that require BER encoded keys. When working with secp256k1-specific
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* code, the simple 32-byte private keys normally used by the
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* library are sufficient.
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*/
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#ifndef SECP256K1_CONTRIB_BER_PRIVATEKEY_H
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#define SECP256K1_CONTRIB_BER_PRIVATEKEY_H
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#include <secp256k1.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Export a private key in DER format.
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*
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* Returns: 1 if the private key was valid.
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* Args: ctx: pointer to a context object, initialized for signing (cannot
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* be NULL)
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* Out: privkey: pointer to an array for storing the private key in BER.
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* Should have space for 279 bytes, and cannot be NULL.
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* privkeylen: Pointer to an int where the length of the private key in
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* privkey will be stored.
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* In: seckey: pointer to a 32-byte secret key to export.
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* compressed: 1 if the key should be exported in
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* compressed format, 0 otherwise
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*
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* This function is purely meant for compatibility with applications that
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* require BER encoded keys. When working with secp256k1-specific code, the
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* simple 32-byte private keys are sufficient.
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*
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* Note that this function does not guarantee correct DER output. It is
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* guaranteed to be parsable by secp256k1_ec_privkey_import_der
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*/
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SECP256K1_WARN_UNUSED_RESULT int ec_privkey_export_der(
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const secp256k1_context* ctx,
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unsigned char *privkey,
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size_t *privkeylen,
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const unsigned char *seckey,
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int compressed
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
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/** Import a private key in DER format.
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* Returns: 1 if a private key was extracted.
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* Args: ctx: pointer to a context object (cannot be NULL).
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* Out: seckey: pointer to a 32-byte array for storing the private key.
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* (cannot be NULL).
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* In: privkey: pointer to a private key in DER format (cannot be NULL).
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* privkeylen: length of the DER private key pointed to be privkey.
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*
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* This function will accept more than just strict DER, and even allow some BER
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* violations. The public key stored inside the DER-encoded private key is not
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* verified for correctness, nor are the curve parameters. Use this function
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* only if you know in advance it is supposed to contain a secp256k1 private
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* key.
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*/
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SECP256K1_WARN_UNUSED_RESULT int ec_privkey_import_der(
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const secp256k1_context* ctx,
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unsigned char *seckey,
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const unsigned char *privkey,
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size_t privkeylen
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SECP256K1_CONTRIB_BER_PRIVATEKEY_H */
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