patch-2.4.22 linux-2.4.22/include/linux/crypto.h

• Lines: 380
• Date: 2003-08-25 04:44:44.000000000 -0700
• Orig file: linux-2.4.21/include/linux/crypto.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/include/linux/crypto.h linux-2.4.22/include/linux/crypto.h
@@ -0,0 +1,379 @@
+/*
+ * Scatterlist Cryptographic API.
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * Copyright (c) 2002 David S. Miller (davem@redhat.com)
+ *
+ * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
+ * and Nettle, by Niels Möller.
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ */
+#ifndef _LINUX_CRYPTO_H
+#define _LINUX_CRYPTO_H
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <asm/page.h>
+
+/*
+ * Algorithm masks and types.
+ */
+#define CRYPTO_ALG_TYPE_MASK		0x000000ff
+#define CRYPTO_ALG_TYPE_CIPHER		0x00000001
+#define CRYPTO_ALG_TYPE_DIGEST		0x00000002
+#define CRYPTO_ALG_TYPE_COMPRESS	0x00000004
+
+/*
+ * Transform masks and values (for crt_flags).
+ */
+#define CRYPTO_TFM_MODE_MASK		0x000000ff
+#define CRYPTO_TFM_REQ_MASK		0x000fff00
+#define CRYPTO_TFM_RES_MASK		0xfff00000
+
+#define CRYPTO_TFM_MODE_ECB		0x00000001
+#define CRYPTO_TFM_MODE_CBC		0x00000002
+#define CRYPTO_TFM_MODE_CFB		0x00000004
+#define CRYPTO_TFM_MODE_CTR		0x00000008
+
+#define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
+#define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
+#define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
+#define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
+#define CRYPTO_TFM_RES_BAD_BLOCK_LEN 	0x00800000
+#define CRYPTO_TFM_RES_BAD_FLAGS 	0x01000000
+
+/*
+ * Miscellaneous stuff.
+ */
+#define CRYPTO_UNSPEC			0
+#define CRYPTO_MAX_ALG_NAME		64
+
+struct scatterlist;
+
+/*
+ * Algorithms: modular crypto algorithm implementations, managed
+ * via crypto_register_alg() and crypto_unregister_alg().
+ */
+struct cipher_alg {
+	unsigned int cia_min_keysize;
+	unsigned int cia_max_keysize;
+	unsigned int cia_ivsize;
+	int (*cia_setkey)(void *ctx, const u8 *key,
+	                  unsigned int keylen, u32 *flags);
+	void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src);
+	void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src);
+};
+
+struct digest_alg {
+	unsigned int dia_digestsize;
+	void (*dia_init)(void *ctx);
+	void (*dia_update)(void *ctx, const u8 *data, unsigned int len);
+	void (*dia_final)(void *ctx, u8 *out);
+};
+
+struct compress_alg {
+	int (*coa_init)(void *ctx);
+	void (*coa_exit)(void *ctx);
+	int (*coa_compress)(void *ctx, const u8 *src, unsigned int slen,
+	                    u8 *dst, unsigned int *dlen);
+	int (*coa_decompress)(void *ctx, const u8 *src, unsigned int slen,
+	                      u8 *dst, unsigned int *dlen);
+};
+
+#define cra_cipher	cra_u.cipher
+#define cra_digest	cra_u.digest
+#define cra_compress	cra_u.compress
+
+struct crypto_alg {
+	struct list_head cra_list;
+	u32 cra_flags;
+	unsigned int cra_blocksize;
+	unsigned int cra_ctxsize;
+	const char cra_name[CRYPTO_MAX_ALG_NAME];
+
+	union {
+		struct cipher_alg cipher;
+		struct digest_alg digest;
+		struct compress_alg compress;
+	} cra_u;
+	
+	struct module *cra_module;
+};
+
+/*
+ * Algorithm registration interface.
+ */
+int crypto_register_alg(struct crypto_alg *alg);
+int crypto_unregister_alg(struct crypto_alg *alg);
+
+/*
+ * Algorithm query interface.
+ */
+int crypto_alg_available(const char *name, u32 flags);
+
+/*
+ * Transforms: user-instantiated objects which encapsulate algorithms
+ * and core processing logic.  Managed via crypto_alloc_tfm() and
+ * crypto_free_tfm(), as well as the various helpers below.
+ */
+struct crypto_tfm;
+
+struct cipher_tfm {
+	void *cit_iv;
+	u32 cit_mode;
+	int (*cit_setkey)(struct crypto_tfm *tfm,
+	                  const u8 *key, unsigned int keylen);
+	int (*cit_encrypt)(struct crypto_tfm *tfm,
+			   struct scatterlist *dst,
+			   struct scatterlist *src,
+			   unsigned int nbytes);
+	int (*cit_encrypt_iv)(struct crypto_tfm *tfm,
+	                      struct scatterlist *dst,
+	                      struct scatterlist *src,
+	                      unsigned int nbytes, u8 *iv);
+	int (*cit_decrypt)(struct crypto_tfm *tfm,
+			   struct scatterlist *dst,
+			   struct scatterlist *src,
+			   unsigned int nbytes);
+	int (*cit_decrypt_iv)(struct crypto_tfm *tfm,
+			   struct scatterlist *dst,
+			   struct scatterlist *src,
+			   unsigned int nbytes, u8 *iv);
+	void (*cit_xor_block)(u8 *dst, const u8 *src);
+};
+
+struct digest_tfm {
+	void (*dit_init)(struct crypto_tfm *tfm);
+	void (*dit_update)(struct crypto_tfm *tfm,
+	                   struct scatterlist *sg, unsigned int nsg);
+	void (*dit_final)(struct crypto_tfm *tfm, u8 *out);
+	void (*dit_digest)(struct crypto_tfm *tfm, struct scatterlist *sg,
+	                   unsigned int nsg, u8 *out);
+#ifdef CONFIG_CRYPTO_HMAC
+	void *dit_hmac_block;
+#endif
+};
+
+struct compress_tfm {
+	int (*cot_compress)(struct crypto_tfm *tfm,
+	                    const u8 *src, unsigned int slen,
+	                    u8 *dst, unsigned int *dlen);
+	int (*cot_decompress)(struct crypto_tfm *tfm,
+	                      const u8 *src, unsigned int slen,
+	                      u8 *dst, unsigned int *dlen);
+};
+
+#define crt_cipher	crt_u.cipher
+#define crt_digest	crt_u.digest
+#define crt_compress	crt_u.compress
+
+struct crypto_tfm {
+
+	u32 crt_flags;
+	
+	union {
+		struct cipher_tfm cipher;
+		struct digest_tfm digest;
+		struct compress_tfm compress;
+	} crt_u;
+	
+	struct crypto_alg *__crt_alg;
+};
+
+/* 
+ * Transform user interface.
+ */
+ 
+/*
+ * crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
+ * If that fails and the kernel supports dynamically loadable modules, it
+ * will then attempt to load a module of the same name or alias.  A refcount
+ * is grabbed on the algorithm which is then associated with the new transform.
+ *
+ * crypto_free_tfm() frees up the transform and any associated resources,
+ * then drops the refcount on the associated algorithm.
+ */
+struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
+void crypto_free_tfm(struct crypto_tfm *tfm);
+
+/*
+ * Transform helpers which query the underlying algorithm.
+ */
+static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
+{
+	return tfm->__crt_alg->cra_name;
+}
+
+static inline const char *crypto_tfm_alg_modname(struct crypto_tfm *tfm)
+{
+	struct crypto_alg *alg = tfm->__crt_alg;
+	
+	if (alg->cra_module)
+		return alg->cra_module->name;
+	else
+		return NULL;
+}
+
+static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
+{
+	return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
+}
+
+static inline unsigned int crypto_tfm_alg_min_keysize(struct crypto_tfm *tfm)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	return tfm->__crt_alg->cra_cipher.cia_min_keysize;
+}
+
+static inline unsigned int crypto_tfm_alg_max_keysize(struct crypto_tfm *tfm)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	return tfm->__crt_alg->cra_cipher.cia_max_keysize;
+}
+
+static inline unsigned int crypto_tfm_alg_ivsize(struct crypto_tfm *tfm)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	return tfm->__crt_alg->cra_cipher.cia_ivsize;
+}
+
+static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
+{
+	return tfm->__crt_alg->cra_blocksize;
+}
+
+static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
+	return tfm->__crt_alg->cra_digest.dia_digestsize;
+}
+
+/*
+ * API wrappers.
+ */
+static inline void crypto_digest_init(struct crypto_tfm *tfm)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
+	tfm->crt_digest.dit_init(tfm);
+}
+
+static inline void crypto_digest_update(struct crypto_tfm *tfm,
+                                        struct scatterlist *sg,
+                                        unsigned int nsg)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
+	tfm->crt_digest.dit_update(tfm, sg, nsg);
+}
+
+static inline void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
+	tfm->crt_digest.dit_final(tfm, out);
+}
+
+static inline void crypto_digest_digest(struct crypto_tfm *tfm,
+                                        struct scatterlist *sg,
+                                        unsigned int nsg, u8 *out)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
+	tfm->crt_digest.dit_digest(tfm, sg, nsg, out);
+}
+
+static inline int crypto_cipher_setkey(struct crypto_tfm *tfm,
+                                       const u8 *key, unsigned int keylen)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	return tfm->crt_cipher.cit_setkey(tfm, key, keylen);
+}
+
+static inline int crypto_cipher_encrypt(struct crypto_tfm *tfm,
+                                        struct scatterlist *dst,
+                                        struct scatterlist *src,
+                                        unsigned int nbytes)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	return tfm->crt_cipher.cit_encrypt(tfm, dst, src, nbytes);
+}                                        
+
+static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm,
+                                           struct scatterlist *dst,
+                                           struct scatterlist *src,
+                                           unsigned int nbytes, u8 *iv)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
+	return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv);
+}                                        
+
+static inline int crypto_cipher_decrypt(struct crypto_tfm *tfm,
+                                        struct scatterlist *dst,
+                                        struct scatterlist *src,
+                                        unsigned int nbytes)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	return tfm->crt_cipher.cit_decrypt(tfm, dst, src, nbytes);
+}
+
+static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm,
+                                           struct scatterlist *dst,
+                                           struct scatterlist *src,
+                                           unsigned int nbytes, u8 *iv)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
+	return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv);
+}
+
+static inline void crypto_cipher_set_iv(struct crypto_tfm *tfm,
+                                        const u8 *src, unsigned int len)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	memcpy(tfm->crt_cipher.cit_iv, src, len);
+}
+
+static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
+                                        u8 *dst, unsigned int len)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+	memcpy(dst, tfm->crt_cipher.cit_iv, len);
+}
+
+static inline int crypto_comp_compress(struct crypto_tfm *tfm,
+                                       const u8 *src, unsigned int slen,
+                                       u8 *dst, unsigned int *dlen)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
+	return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
+}
+
+static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
+                                         const u8 *src, unsigned int slen,
+                                         u8 *dst, unsigned int *dlen)
+{
+	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
+	return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
+}
+
+/*
+ * HMAC support.
+ */
+#ifdef CONFIG_CRYPTO_HMAC
+void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen);
+void crypto_hmac_update(struct crypto_tfm *tfm,
+                        struct scatterlist *sg, unsigned int nsg);
+void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
+                       unsigned int *keylen, u8 *out);
+void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
+                 struct scatterlist *sg, unsigned int nsg, u8 *out);
+#endif	/* CONFIG_CRYPTO_HMAC */
+
+#endif	/* _LINUX_CRYPTO_H */
+