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