1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2017-2020, Linaro Limited 4 */ 5 6 #include <crypto/crypto_accel.h> 7 #include <crypto/crypto.h> 8 #include <crypto/ghash-ce-core.h> 9 #include <crypto/internal_aes-gcm.h> 10 #include <io.h> 11 #include <kernel/panic.h> 12 #include <kernel/thread.h> 13 #include <string.h> 14 #include <types_ext.h> 15 16 static void get_be_block(void *dst, const void *src) 17 { 18 uint64_t *d = dst; 19 20 d[1] = get_be64(src); 21 d[0] = get_be64((const uint8_t *)src + 8); 22 } 23 24 static void put_be_block(void *dst, const void *src) 25 { 26 const uint64_t *s = src; 27 28 put_be64(dst, s[1]); 29 put_be64((uint8_t *)dst + 8, s[0]); 30 } 31 32 void internal_aes_gcm_set_key(struct internal_aes_gcm_state *state, 33 const struct internal_aes_gcm_key *enc_key) 34 { 35 uint64_t k[2]; 36 uint64_t a; 37 uint64_t b; 38 39 crypto_aes_enc_block(enc_key->data, sizeof(enc_key->data), 40 enc_key->rounds, state->ctr, k); 41 42 /* Store hash key in little endian and multiply by 'x' */ 43 b = get_be64(k); 44 a = get_be64(k + 1); 45 state->ghash_key.k[0] = (a << 1) | (b >> 63); 46 state->ghash_key.k[1] = (b << 1) | (a >> 63); 47 if (b >> 63) 48 state->ghash_key.k[1] ^= 0xc200000000000000UL; 49 } 50 51 void internal_aes_gcm_ghash_update(struct internal_aes_gcm_state *state, 52 const void *head, const void *data, 53 size_t num_blocks) 54 { 55 uint32_t vfp_state; 56 uint64_t dg[2]; 57 58 get_be_block(dg, state->hash_state); 59 60 vfp_state = thread_kernel_enable_vfp(); 61 62 #ifdef CFG_HWSUPP_PMULT_64 63 pmull_ghash_update_p64(num_blocks, dg, data, &state->ghash_key, head); 64 #else 65 pmull_ghash_update_p8(num_blocks, dg, data, &state->ghash_key, head); 66 #endif 67 thread_kernel_disable_vfp(vfp_state); 68 69 put_be_block(state->hash_state, dg); 70 } 71 72 TEE_Result internal_aes_gcm_expand_enc_key(const void *key, size_t key_len, 73 struct internal_aes_gcm_key *enc_key) 74 { 75 return crypto_accel_aes_expand_keys(key, key_len, enc_key->data, NULL, 76 sizeof(enc_key->data), 77 &enc_key->rounds); 78 } 79 80 #ifdef ARM64 81 void 82 internal_aes_gcm_update_payload_blocks(struct internal_aes_gcm_state *state, 83 const struct internal_aes_gcm_key *ek, 84 TEE_OperationMode mode, const void *src, 85 size_t num_blocks, void *dst) 86 { 87 uint32_t vfp_state; 88 uint64_t dg[2]; 89 uint64_t ctr[2]; 90 91 get_be_block(dg, state->hash_state); 92 get_be_block(ctr, state->ctr); 93 94 vfp_state = thread_kernel_enable_vfp(); 95 96 pmull_gcm_load_round_keys(ek->data, ek->rounds); 97 98 if (mode == TEE_MODE_ENCRYPT) 99 pmull_gcm_encrypt(num_blocks, dg, dst, src, &state->ghash_key, 100 ctr, ek->rounds, state->buf_cryp); 101 else 102 pmull_gcm_decrypt(num_blocks, dg, dst, src, &state->ghash_key, 103 ctr, ek->rounds); 104 105 thread_kernel_disable_vfp(vfp_state); 106 107 put_be_block(state->ctr, ctr); 108 put_be_block(state->hash_state, dg); 109 } 110 #endif /*ARM64*/ 111