86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
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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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