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- /*
- * Copyright 2001-2022 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- /*-
- * PPC support for AES GCM.
- * This file is included by cipher_aes_gcm_hw.c
- */
- static int aes_ppc_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key,
- size_t keylen)
- {
- PROV_AES_GCM_CTX *actx = (PROV_AES_GCM_CTX *)ctx;
- AES_KEY *ks = &actx->ks.ks;
- GCM_HW_SET_KEY_CTR_FN(ks, aes_p8_set_encrypt_key, aes_p8_encrypt,
- aes_p8_ctr32_encrypt_blocks);
- return 1;
- }
- extern size_t ppc_aes_gcm_encrypt(const unsigned char *in, unsigned char *out, size_t len,
- const void *key, unsigned char ivec[16], u64 *Xi);
- extern size_t ppc_aes_gcm_decrypt(const unsigned char *in, unsigned char *out, size_t len,
- const void *key, unsigned char ivec[16], u64 *Xi);
- static inline u32 UTO32(unsigned char *buf)
- {
- return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) | ((u32) buf[2] << 8) | ((u32) buf[3]);
- }
- static inline u32 add32TOU(unsigned char buf[4], u32 n)
- {
- u32 r;
- r = UTO32(buf);
- r += n;
- buf[0] = (unsigned char) (r >> 24) & 0xFF;
- buf[1] = (unsigned char) (r >> 16) & 0xFF;
- buf[2] = (unsigned char) (r >> 8) & 0xFF;
- buf[3] = (unsigned char) r & 0xFF;
- return r;
- }
- static size_t aes_p10_gcm_crypt(const unsigned char *in, unsigned char *out, size_t len,
- const void *key, unsigned char ivec[16], u64 *Xi, int encrypt)
- {
- int s = 0;
- int ndone = 0;
- int ctr_reset = 0;
- u64 blocks_unused;
- u64 nb = len / 16;
- u64 next_ctr = 0;
- unsigned char ctr_saved[12];
- memcpy(ctr_saved, ivec, 12);
- while (nb) {
- blocks_unused = (u64) 0xffffffffU + 1 - (u64) UTO32 (ivec + 12);
- if (nb > blocks_unused) {
- len = blocks_unused * 16;
- nb -= blocks_unused;
- next_ctr = blocks_unused;
- ctr_reset = 1;
- } else {
- len = nb * 16;
- next_ctr = nb;
- nb = 0;
- }
- s = encrypt ? ppc_aes_gcm_encrypt(in, out, len, key, ivec, Xi)
- : ppc_aes_gcm_decrypt(in, out, len, key, ivec, Xi);
- /* add counter to ivec */
- add32TOU(ivec + 12, (u32) next_ctr);
- if (ctr_reset) {
- ctr_reset = 0;
- in += len;
- out += len;
- }
- memcpy(ivec, ctr_saved, 12);
- ndone += s;
- }
- return ndone;
- }
- size_t ppc_aes_gcm_encrypt_wrap(const unsigned char *in, unsigned char *out, size_t len,
- const void *key, unsigned char ivec[16], u64 *Xi)
- {
- return aes_p10_gcm_crypt(in, out, len, key, ivec, Xi, 1);
- }
- size_t ppc_aes_gcm_decrypt_wrap(const unsigned char *in, unsigned char *out, size_t len,
- const void *key, unsigned char ivec[16], u64 *Xi)
- {
- return aes_p10_gcm_crypt(in, out, len, key, ivec, Xi, 0);
- }
- static const PROV_GCM_HW aes_ppc_gcm = {
- aes_ppc_gcm_initkey,
- ossl_gcm_setiv,
- ossl_gcm_aad_update,
- generic_aes_gcm_cipher_update,
- ossl_gcm_cipher_final,
- ossl_gcm_one_shot
- };
- const PROV_GCM_HW *ossl_prov_aes_hw_gcm(size_t keybits)
- {
- return PPC_AES_GCM_CAPABLE ? &aes_ppc_gcm : &aes_gcm;
- }
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