6cb8815f41
Split out the sign/verify functionality from the existing akcipher interface. Most algorithms in akcipher either support encryption and decryption, or signing and verify. Only one supports both. As a signature algorithm may not support encryption at all, these two should be spearated. For now sig is simply a wrapper around akcipher as all algorithms remain unchanged. This is a first step and allows users to start allocating sig instead of akcipher. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Public Key Signature Algorithm
|
|
*
|
|
* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
#ifndef _CRYPTO_SIG_H
|
|
#define _CRYPTO_SIG_H
|
|
|
|
#include <linux/crypto.h>
|
|
|
|
/**
|
|
* struct crypto_sig - user-instantiated objects which encapsulate
|
|
* algorithms and core processing logic
|
|
*
|
|
* @base: Common crypto API algorithm data structure
|
|
*/
|
|
struct crypto_sig {
|
|
struct crypto_tfm base;
|
|
};
|
|
|
|
/**
|
|
* DOC: Generic Public Key Signature API
|
|
*
|
|
* The Public Key Signature API is used with the algorithms of type
|
|
* CRYPTO_ALG_TYPE_SIG (listed as type "sig" in /proc/crypto)
|
|
*/
|
|
|
|
/**
|
|
* crypto_alloc_sig() - allocate signature tfm handle
|
|
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
|
|
* signing algorithm e.g. "ecdsa"
|
|
* @type: specifies the type of the algorithm
|
|
* @mask: specifies the mask for the algorithm
|
|
*
|
|
* Allocate a handle for public key signature algorithm. The returned struct
|
|
* crypto_sig is the handle that is required for any subsequent
|
|
* API invocation for signature operations.
|
|
*
|
|
* Return: allocated handle in case of success; IS_ERR() is true in case
|
|
* of an error, PTR_ERR() returns the error code.
|
|
*/
|
|
struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask);
|
|
|
|
static inline struct crypto_tfm *crypto_sig_tfm(struct crypto_sig *tfm)
|
|
{
|
|
return &tfm->base;
|
|
}
|
|
|
|
/**
|
|
* crypto_free_sig() - free signature tfm handle
|
|
*
|
|
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
|
|
*
|
|
* If @tfm is a NULL or error pointer, this function does nothing.
|
|
*/
|
|
static inline void crypto_free_sig(struct crypto_sig *tfm)
|
|
{
|
|
crypto_destroy_tfm(tfm, crypto_sig_tfm(tfm));
|
|
}
|
|
|
|
/**
|
|
* crypto_sig_maxsize() - Get len for output buffer
|
|
*
|
|
* Function returns the dest buffer size required for a given key.
|
|
* Function assumes that the key is already set in the transformation. If this
|
|
* function is called without a setkey or with a failed setkey, you will end up
|
|
* in a NULL dereference.
|
|
*
|
|
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
|
|
*/
|
|
int crypto_sig_maxsize(struct crypto_sig *tfm);
|
|
|
|
/**
|
|
* crypto_sig_sign() - Invoke signing operation
|
|
*
|
|
* Function invokes the specific signing operation for a given algorithm
|
|
*
|
|
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
|
|
* @src: source buffer
|
|
* @slen: source length
|
|
* @dst: destinatino obuffer
|
|
* @dlen: destination length
|
|
*
|
|
* Return: zero on success; error code in case of error
|
|
*/
|
|
int crypto_sig_sign(struct crypto_sig *tfm,
|
|
const void *src, unsigned int slen,
|
|
void *dst, unsigned int dlen);
|
|
|
|
/**
|
|
* crypto_sig_verify() - Invoke signature verification
|
|
*
|
|
* Function invokes the specific signature verification operation
|
|
* for a given algorithm.
|
|
*
|
|
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
|
|
* @src: source buffer
|
|
* @slen: source length
|
|
* @digest: digest
|
|
* @dlen: digest length
|
|
*
|
|
* Return: zero on verification success; error code in case of error.
|
|
*/
|
|
int crypto_sig_verify(struct crypto_sig *tfm,
|
|
const void *src, unsigned int slen,
|
|
const void *digest, unsigned int dlen);
|
|
|
|
/**
|
|
* crypto_sig_set_pubkey() - Invoke set public key operation
|
|
*
|
|
* Function invokes the algorithm specific set key function, which knows
|
|
* how to decode and interpret the encoded key and parameters
|
|
*
|
|
* @tfm: tfm handle
|
|
* @key: BER encoded public key, algo OID, paramlen, BER encoded
|
|
* parameters
|
|
* @keylen: length of the key (not including other data)
|
|
*
|
|
* Return: zero on success; error code in case of error
|
|
*/
|
|
int crypto_sig_set_pubkey(struct crypto_sig *tfm,
|
|
const void *key, unsigned int keylen);
|
|
|
|
/**
|
|
* crypto_sig_set_privkey() - Invoke set private key operation
|
|
*
|
|
* Function invokes the algorithm specific set key function, which knows
|
|
* how to decode and interpret the encoded key and parameters
|
|
*
|
|
* @tfm: tfm handle
|
|
* @key: BER encoded private key, algo OID, paramlen, BER encoded
|
|
* parameters
|
|
* @keylen: length of the key (not including other data)
|
|
*
|
|
* Return: zero on success; error code in case of error
|
|
*/
|
|
int crypto_sig_set_privkey(struct crypto_sig *tfm,
|
|
const void *key, unsigned int keylen);
|
|
#endif
|