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#ifndef _IPXE_CRYPTO_H
#define _IPXE_CRYPTO_H
/** @file
*
* Cryptographic API
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stddef.h>
/** A message digest algorithm */
struct digest_algorithm {
/** Algorithm name */
const char *name;
/** Context size */
size_t ctxsize;
/** Block size */
size_t blocksize;
/** Digest size */
size_t digestsize;
/** Initialise digest
*
* @v ctx Context
*/
void ( * init ) ( void *ctx );
/** Update digest with new data
*
* @v ctx Context
* @v src Data to digest
* @v len Length of data
*
* @v len is not necessarily a multiple of @c blocksize.
*/
void ( * update ) ( void *ctx, const void *src, size_t len );
/** Finalise digest
*
* @v ctx Context
* @v out Buffer for digest output
*/
void ( * final ) ( void *ctx, void *out );
};
/** A cipher algorithm */
struct cipher_algorithm {
/** Algorithm name */
const char *name;
/** Context size */
size_t ctxsize;
/** Block size */
size_t blocksize;
/** Set key
*
* @v ctx Context
* @v key Key
* @v keylen Key length
* @ret rc Return status code
*/
int ( * setkey ) ( void *ctx, const void *key, size_t keylen );
/** Set initialisation vector
*
* @v ctx Context
* @v iv Initialisation vector
*/
void ( * setiv ) ( void *ctx, const void *iv );
/** Encrypt data
*
* @v ctx Context
* @v src Data to encrypt
* @v dst Buffer for encrypted data
* @v len Length of data
*
* @v len is guaranteed to be a multiple of @c blocksize.
*/
void ( * encrypt ) ( void *ctx, const void *src, void *dst,
size_t len );
/** Decrypt data
*
* @v ctx Context
* @v src Data to decrypt
* @v dst Buffer for decrypted data
* @v len Length of data
*
* @v len is guaranteed to be a multiple of @c blocksize.
*/
void ( * decrypt ) ( void *ctx, const void *src, void *dst,
size_t len );
};
/** A public key algorithm */
struct pubkey_algorithm {
/** Algorithm name */
const char *name;
/** Context size */
size_t ctxsize;
/** Initialise algorithm
*
* @v ctx Context
* @v key Key
* @v key_len Length of key
* @ret rc Return status code
*/
int ( * init ) ( void *ctx, const void *key, size_t key_len );
/** Calculate maximum output length
*
* @v ctx Context
* @ret max_len Maximum output length
*/
size_t ( * max_len ) ( void *ctx );
/** Encrypt
*
* @v ctx Context
* @v plaintext Plaintext
* @v plaintext_len Length of plaintext
* @v ciphertext Ciphertext
* @ret ciphertext_len Length of ciphertext, or negative error
*/
int ( * encrypt ) ( void *ctx, const void *data, size_t len,
void *out );
/** Decrypt
*
* @v ctx Context
* @v ciphertext Ciphertext
* @v ciphertext_len Ciphertext length
* @v plaintext Plaintext
* @ret plaintext_len Plaintext length, or negative error
*/
int ( * decrypt ) ( void *ctx, const void *data, size_t len,
void *out );
/** Sign digest value
*
* @v ctx Context
* @v digest Digest algorithm
* @v value Digest value
* @v signature Signature
* @ret signature_len Signature length, or negative error
*/
int ( * sign ) ( void *ctx, struct digest_algorithm *digest,
const void *value, void *signature );
/** Verify signed digest value
*
* @v ctx Context
* @v digest Digest algorithm
* @v value Digest value
* @v signature Signature
* @v signature_len Signature length
* @ret rc Return status code
*/
int ( * verify ) ( void *ctx, struct digest_algorithm *digest,
const void *value, const void *signature,
size_t signature_len );
/** Finalise algorithm
*
* @v ctx Context
*/
void ( * final ) ( void *ctx );
/** Check that public key matches private key
*
* @v private_key Private key
* @v private_key_len Private key length
* @v public_key Public key
* @v public_key_len Public key length
* @ret rc Return status code
*/
int ( * match ) ( const void *private_key, size_t private_key_len,
const void *public_key, size_t public_key_len );
};
static inline void digest_init ( struct digest_algorithm *digest,
void *ctx ) {
digest->init ( ctx );
}
static inline void digest_update ( struct digest_algorithm *digest,
void *ctx, const void *data, size_t len ) {
digest->update ( ctx, data, len );
}
static inline void digest_final ( struct digest_algorithm *digest,
void *ctx, void *out ) {
digest->final ( ctx, out );
}
static inline int cipher_setkey ( struct cipher_algorithm *cipher,
void *ctx, const void *key, size_t keylen ) {
return cipher->setkey ( ctx, key, keylen );
}
static inline void cipher_setiv ( struct cipher_algorithm *cipher,
void *ctx, const void *iv ) {
cipher->setiv ( ctx, iv );
}
static inline void cipher_encrypt ( struct cipher_algorithm *cipher,
void *ctx, const void *src, void *dst,
size_t len ) {
cipher->encrypt ( ctx, src, dst, len );
}
#define cipher_encrypt( cipher, ctx, src, dst, len ) do { \
assert ( ( (len) & ( (cipher)->blocksize - 1 ) ) == 0 ); \
cipher_encrypt ( (cipher), (ctx), (src), (dst), (len) ); \
} while ( 0 )
static inline void cipher_decrypt ( struct cipher_algorithm *cipher,
void *ctx, const void *src, void *dst,
size_t len ) {
cipher->decrypt ( ctx, src, dst, len );
}
#define cipher_decrypt( cipher, ctx, src, dst, len ) do { \
assert ( ( (len) & ( (cipher)->blocksize - 1 ) ) == 0 ); \
cipher_decrypt ( (cipher), (ctx), (src), (dst), (len) ); \
} while ( 0 )
static inline int is_stream_cipher ( struct cipher_algorithm *cipher ) {
return ( cipher->blocksize == 1 );
}
static inline int pubkey_init ( struct pubkey_algorithm *pubkey, void *ctx,
const void *key, size_t key_len ) {
return pubkey->init ( ctx, key, key_len );
}
static inline size_t pubkey_max_len ( struct pubkey_algorithm *pubkey,
void *ctx ) {
return pubkey->max_len ( ctx );
}
static inline int pubkey_encrypt ( struct pubkey_algorithm *pubkey, void *ctx,
const void *data, size_t len, void *out ) {
return pubkey->encrypt ( ctx, data, len, out );
}
static inline int pubkey_decrypt ( struct pubkey_algorithm *pubkey, void *ctx,
const void *data, size_t len, void *out ) {
return pubkey->decrypt ( ctx, data, len, out );
}
static inline int pubkey_sign ( struct pubkey_algorithm *pubkey, void *ctx,
struct digest_algorithm *digest,
const void *value, void *signature ) {
return pubkey->sign ( ctx, digest, value, signature );
}
static inline int pubkey_verify ( struct pubkey_algorithm *pubkey, void *ctx,
struct digest_algorithm *digest,
const void *value, const void *signature,
size_t signature_len ) {
return pubkey->verify ( ctx, digest, value, signature, signature_len );
}
static inline void pubkey_final ( struct pubkey_algorithm *pubkey, void *ctx ) {
pubkey->final ( ctx );
}
static inline int pubkey_match ( struct pubkey_algorithm *pubkey,
const void *private_key,
size_t private_key_len, const void *public_key,
size_t public_key_len ) {
return pubkey->match ( private_key, private_key_len, public_key,
public_key_len );
}
extern struct digest_algorithm digest_null;
extern struct cipher_algorithm cipher_null;
extern struct pubkey_algorithm pubkey_null;
#endif /* _IPXE_CRYPTO_H */
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