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/* 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;
};
/**
* struct sig_alg - generic public key signature algorithm
*
* @sign: Function performs a sign operation as defined by public key
* algorithm. Optional.
* @verify: Function performs a complete verify operation as defined by
* public key algorithm, returning verification status. Optional.
* @set_pub_key: Function invokes the algorithm specific set public key
* function, which knows how to decode and interpret
* the BER encoded public key and parameters. Mandatory.
* @set_priv_key: Function invokes the algorithm specific set private key
* function, which knows how to decode and interpret
* the BER encoded private key and parameters. Optional.
* @key_size: Function returns key size. Mandatory.
* @digest_size: Function returns maximum digest size. Optional.
* @max_size: Function returns maximum signature size. Optional.
* @init: Initialize the cryptographic transformation object.
* This function is used to initialize the cryptographic
* transformation object. This function is called only once at
* the instantiation time, right after the transformation context
* was allocated. In case the cryptographic hardware has some
* special requirements which need to be handled by software, this
* function shall check for the precise requirement of the
* transformation and put any software fallbacks in place.
* @exit: Deinitialize the cryptographic transformation object. This is a
* counterpart to @init, used to remove various changes set in
* @init.
*
* @base: Common crypto API algorithm data structure
*/
struct sig_alg {
int (*sign)(struct crypto_sig *tfm,
const void *src, unsigned int slen,
void *dst, unsigned int dlen);
int (*verify)(struct crypto_sig *tfm,
const void *src, unsigned int slen,
const void *digest, unsigned int dlen);
int (*set_pub_key)(struct crypto_sig *tfm,
const void *key, unsigned int keylen);
int (*set_priv_key)(struct crypto_sig *tfm,
const void *key, unsigned int keylen);
unsigned int (*key_size)(struct crypto_sig *tfm);
unsigned int (*digest_size)(struct crypto_sig *tfm);
unsigned int (*max_size)(struct crypto_sig *tfm);
int (*init)(struct crypto_sig *tfm);
void (*exit)(struct crypto_sig *tfm);
struct crypto_alg 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;
}
static inline struct crypto_sig *__crypto_sig_tfm(struct crypto_tfm *tfm)
{
return container_of(tfm, struct crypto_sig, base);
}
static inline struct sig_alg *__crypto_sig_alg(struct crypto_alg *alg)
{
return container_of(alg, struct sig_alg, base);
}
static inline struct sig_alg *crypto_sig_alg(struct crypto_sig *tfm)
{
return __crypto_sig_alg(crypto_sig_tfm(tfm)->__crt_alg);
}
/**
* 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_keysize() - Get key size
*
* Function returns the key size in bytes.
* 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 may end up
* in a NULL dereference.
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
*/
static inline unsigned int crypto_sig_keysize(struct crypto_sig *tfm)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->key_size(tfm);
}
/**
* crypto_sig_digestsize() - Get maximum digest size
*
* Function returns the maximum digest size in bytes.
* 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 may end up
* in a NULL dereference.
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
*/
static inline unsigned int crypto_sig_digestsize(struct crypto_sig *tfm)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->digest_size(tfm);
}
/**
* crypto_sig_maxsize() - Get maximum signature size
*
* Function returns the maximum signature size in bytes.
* 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 may end up
* in a NULL dereference.
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
*/
static inline unsigned int crypto_sig_maxsize(struct crypto_sig *tfm)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->max_size(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: destination obuffer
* @dlen: destination length
*
* Return: zero on success; error code in case of error
*/
static inline int crypto_sig_sign(struct crypto_sig *tfm,
const void *src, unsigned int slen,
void *dst, unsigned int dlen)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->sign(tfm, src, slen, dst, 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.
*/
static inline int crypto_sig_verify(struct crypto_sig *tfm,
const void *src, unsigned int slen,
const void *digest, unsigned int dlen)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->verify(tfm, src, slen, digest, 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
*/
static inline int crypto_sig_set_pubkey(struct crypto_sig *tfm,
const void *key, unsigned int keylen)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->set_pub_key(tfm, key, 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
*/
static inline int crypto_sig_set_privkey(struct crypto_sig *tfm,
const void *key, unsigned int keylen)
{
struct sig_alg *alg = crypto_sig_alg(tfm);
return alg->set_priv_key(tfm, key, keylen);
}
#endif
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