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a3219b24a8
The various types of cryptographic algorithm are fundamentally different, and it was probably a mistake to try to handle them via a single common type. pubkey_algorithm is a placeholder type for now.
142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
#ifndef _GPXE_CRYPTO_H
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#define _GPXE_CRYPTO_H
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/** @file
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*
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* Cryptographic API
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*
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*/
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#include <stdint.h>
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#include <stddef.h>
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/** A message digest algorithm */
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struct digest_algorithm {
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/** Algorithm name */
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const char *name;
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/** Context size */
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size_t ctxsize;
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/** Block size */
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size_t blocksize;
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/** Digest size */
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size_t digestsize;
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/** Initialise digest
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*
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* @v ctx Context
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*/
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void ( * init ) ( void *ctx );
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/** Update digest with new data
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*
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* @v ctx Context
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* @v src Data to digest
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* @v len Length of data
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*
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* @v len is not necessarily a multiple of @c blocksize.
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*/
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void ( * update ) ( void *ctx, const void *src, size_t len );
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/** Finalise digest
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*
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* @v ctx Context
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* @v out Buffer for digest output
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*/
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void ( * final ) ( void *ctx, void *out );
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};
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/** A cipher algorithm */
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struct cipher_algorithm {
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/** Algorithm name */
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const char *name;
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/** Context size */
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size_t ctxsize;
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/** Block size */
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size_t blocksize;
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/** Set key
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*
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* @v ctx Context
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* @v key Key
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* @v keylen Key length
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* @ret rc Return status code
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*/
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int ( * setkey ) ( void *ctx, const void *key, size_t keylen );
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/** Set initialisation vector
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*
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* @v ctx Context
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* @v iv Initialisation vector
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*/
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void ( * setiv ) ( void *ctx, const void *iv );
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/** Encrypt data
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*
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* @v ctx Context
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* @v src Data to encrypt
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* @v dst Buffer for encrypted data
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* @v len Length of data
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* @ret rc Return status code
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*
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* @v len is guaranteed to be a multiple of @c blocksize.
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*/
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void ( * encrypt ) ( void *ctx, const void *src, void *dst,
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size_t len );
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/** Decrypt data
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*
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* @v ctx Context
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* @v src Data to decrypt
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* @v dst Buffer for decrypted data
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* @v len Length of data
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* @ret rc Return status code
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*
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* @v len is guaranteed to be a multiple of @c blocksize.
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*/
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void ( * decrypt ) ( void *ctx, const void *src, void *dst,
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size_t len );
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};
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/** A public key algorithm */
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struct pubkey_algorithm {
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/** Algorithm name */
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const char *name;
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/** Context size */
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size_t ctxsize;
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};
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static inline void digest_init ( struct digest_algorithm *digest,
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void *ctx ) {
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digest->init ( ctx );
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}
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static inline void digest_update ( struct digest_algorithm *digest,
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void *ctx, const void *data, size_t len ) {
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digest->update ( ctx, data, len );
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}
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static inline void digest_final ( struct digest_algorithm *digest,
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void *ctx, void *out ) {
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digest->final ( ctx, out );
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}
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static inline int cipher_setkey ( struct cipher_algorithm *cipher,
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void *ctx, const void *key, size_t keylen ) {
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return cipher->setkey ( ctx, key, keylen );
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}
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static inline void cipher_setiv ( struct cipher_algorithm *cipher,
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void *ctx, const void *iv ) {
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cipher->setiv ( ctx, iv );
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}
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static inline int is_stream_cipher ( struct cipher_algorithm *cipher ) {
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return ( cipher->blocksize == 1 );
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}
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extern int cipher_encrypt ( struct cipher_algorithm *cipher,
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void *ctx, const void *src, void *dst,
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size_t len );
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extern int cipher_decrypt ( struct cipher_algorithm *cipher,
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void *ctx, const void *src, void *dst,
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size_t len );
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extern struct digest_algorithm digest_null;
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extern struct cipher_algorithm cipher_null;
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extern struct pubkey_algorithm pubkey_null;
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#endif /* _GPXE_CRYPTO_H */
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