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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/crypto/gcm.h
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#ifndef _CRYPTO_GCM_H

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#define _CRYPTO_GCM_H

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#include <linux/errno.h>

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#include <crypto/aes.h>

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#include <crypto/gf128mul.h>

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#define GCM_AES_IV_SIZE 12

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#define GCM_RFC4106_IV_SIZE 8

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#define GCM_RFC4543_IV_SIZE 8

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/*

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 * validate authentication tag for GCM

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 */

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static inline int crypto_gcm_check_authsize(unsigned int authsize)

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{

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	switch (authsize) {

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	case 4:

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	case 8:

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	case 12:

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	case 13:

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	case 14:

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	case 15:

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	case 16:

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		break;

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	default:

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		return -EINVAL;

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	}

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	return 0;

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}

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/*

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 * validate authentication tag for RFC4106

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 */

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static inline int crypto_rfc4106_check_authsize(unsigned int authsize)

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{

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	switch (authsize) {

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	case 8:

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	case 12:

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	case 16:

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		break;

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	default:

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		return -EINVAL;

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	}

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	return 0;

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}

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/*

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 * validate assoclen for RFC4106/RFC4543

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 */

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static inline int crypto_ipsec_check_assoclen(unsigned int assoclen)

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{

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	switch (assoclen) {

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	case 16:

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	case 20:

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		break;

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	default:

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		return -EINVAL;

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	}

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	return 0;

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}

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struct aesgcm_ctx {

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	be128			ghash_key;

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	struct crypto_aes_ctx	aes_ctx;

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	unsigned int		authsize;

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};

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int aesgcm_expandkey(struct aesgcm_ctx *ctx, const u8 *key,

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		     unsigned int keysize, unsigned int authsize);

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void aesgcm_encrypt(const struct aesgcm_ctx *ctx, u8 *dst, const u8 *src,

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		    int crypt_len, const u8 *assoc, int assoc_len,

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		    const u8 iv[GCM_AES_IV_SIZE], u8 *authtag);

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bool __must_check aesgcm_decrypt(const struct aesgcm_ctx *ctx, u8 *dst,

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				 const u8 *src, int crypt_len, const u8 *assoc,

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				 int assoc_len, const u8 iv[GCM_AES_IV_SIZE],

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				 const u8 *authtag);

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#endif

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