1 /* 2 * Copyright (c) 2023 Eriptic Technologies 3 * 4 * SPDX-License-Identifier: Apache-2.0 or MIT 5 */ 6 7 #ifndef BUFFER_SIZES_H 8 #define BUFFER_SIZES_H 9 10 #ifndef EAD_SIZE 11 #define EAD_SIZE 0 12 #endif 13 14 #ifndef C_I_SIZE 15 #define C_I_SIZE 10 16 #endif 17 18 #ifndef C_R_SIZE 19 #define C_R_SIZE 10 20 #endif 21 22 #ifndef ID_CRED_I_SIZE 23 #define ID_CRED_I_SIZE 400 24 #endif 25 26 #ifndef ID_CRED_R_SIZE 27 #define ID_CRED_R_SIZE 400 28 #endif 29 30 #ifndef CRED_I_SIZE 31 #define CRED_I_SIZE 400 32 #endif 33 34 #ifndef CRED_R_SIZE 35 #define CRED_R_SIZE 400 36 #endif 37 38 #ifndef SUITES_I_SIZE 39 #define SUITES_I_SIZE 6 40 #endif 41 42 #define MAX(a, b) (((a) > (b)) ? (a) : (b)) 43 44 #define BSTR_ENCODING_OVERHEAD(x) \ 45 (((x) <= 5) ? 1 : ((x) <= UINT8_MAX) ? 2 : ((x) <= UINT16_MAX) ? 3 : 5) 46 47 #define AS_BSTR_SIZE(x) (BSTR_ENCODING_OVERHEAD(x) + x) 48 49 #define P_256_PRIV_KEY_SIZE 32 50 #define P_256_PUB_KEY_COMPRESSED_SIZE 33 51 #define P_256_PUB_KEY_UNCOMPRESSED_SIZE 65 52 #define P_256_PUB_KEY_X_CORD_SIZE 32 53 #define PK_SIZE P_256_PUB_KEY_UNCOMPRESSED_SIZE 54 #define G_Y_SIZE P_256_PUB_KEY_X_CORD_SIZE 55 #define G_X_SIZE P_256_PUB_KEY_X_CORD_SIZE 56 #define G_R_SIZE P_256_PUB_KEY_UNCOMPRESSED_SIZE 57 #define G_I_SIZE P_256_PUB_KEY_UNCOMPRESSED_SIZE 58 #define SIGNATURE_SIZE 64 59 #define ECDH_SECRET_SIZE 32 60 #define PRK_SIZE 32 61 #define HASH_SIZE 32 62 #define AEAD_IV_SIZE 13 63 #define MAC_SIZE 16 64 #define MAC23_SIZE 32 65 #define AAD_SIZE 45 66 #define KID_SIZE 8 67 #define SIG_OR_MAC_SIZE 64 68 #define COSE_SIGN1_STR_LEN 10 /* The length of the string "Signature1" */ 69 #define COSE_ENC0_STR_LEN 8 /* The length of the string "Encrypt0" */ 70 #define CBOR_ENCODED_UINT 2 71 #define CBOR_ARRAY_4_ELEMENTS_OVERHEAD 1 72 73 #define PLAINTEXT2_SIZE \ 74 (AS_BSTR_SIZE(C_R_SIZE) + ID_CRED_I_SIZE + \ 75 AS_BSTR_SIZE(SIG_OR_MAC_SIZE) + EAD_SIZE) 76 #define CIPHERTEXT2_SIZE PLAINTEXT2_SIZE 77 #define G_Y_CIPHERTEXT_2 (G_Y_SIZE + CIPHERTEXT2_SIZE) 78 79 #define PLAINTEXT3_SIZE \ 80 (ID_CRED_I_SIZE + AS_BSTR_SIZE(SIG_OR_MAC_SIZE) + EAD_SIZE) 81 82 #define CIPHERTEXT3_SIZE PLAINTEXT3_SIZE + MAC_SIZE 83 84 #define PLAINTEXT4_SIZE EAD_SIZE + COSE_ENC0_STR_LEN 85 #define CIPHERTEXT4_SIZE PLAINTEXT4_SIZE 86 87 #define MSG_1_SIZE \ 88 (1 + SUITES_I_SIZE + G_X_SIZE + AS_BSTR_SIZE(C_I_SIZE) + EAD_SIZE) 89 #define MSG_2_SIZE (G_Y_SIZE + CIPHERTEXT2_SIZE + AS_BSTR_SIZE(C_R_SIZE)) 90 91 #define MSG_3_SIZE AS_BSTR_SIZE(CIPHERTEXT3_SIZE) 92 #define MSG_4_SIZE AS_BSTR_SIZE(CIPHERTEXT4_SIZE) 93 94 #define MSG12_MAX MAX(MSG_1_SIZE, MSG_2_SIZE) 95 #define MSG34_MAX MAX(MSG_3_SIZE, MSG_4_SIZE) 96 #define MSG_MAX_SIZE MAX(MSG12_MAX, MSG34_MAX) 97 #define PLAINTEXT23_MAX_SIZE MAX(PLAINTEXT2_SIZE, PLAINTEXT3_SIZE) 98 #define CRED_MAX_SIZE MAX(CRED_R_SIZE, CRED_I_SIZE) 99 #define ID_CRED_MAX_SIZE MAX(ID_CRED_R_SIZE, ID_CRED_I_SIZE) 100 101 #define SIG_STRUCT_SIZE_CALC(context, protected, external_aad, payload) \ 102 AS_BSTR_SIZE(context) + AS_BSTR_SIZE(protected) + \ 103 AS_BSTR_SIZE(external_aad) + AS_BSTR_SIZE(payload) + \ 104 CBOR_ARRAY_4_ELEMENTS_OVERHEAD 105 106 #define SIG_STRUCT_SIZE \ 107 SIG_STRUCT_SIZE_CALC( \ 108 COSE_SIGN1_STR_LEN, ID_CRED_MAX_SIZE, \ 109 (AS_BSTR_SIZE(HASH_SIZE) + CRED_MAX_SIZE + EAD_SIZE), \ 110 MAC23_SIZE) 111 112 113 #define CONTEXT_MAC_SIZE \ 114 AS_BSTR_SIZE(AS_BSTR_SIZE(C_R_SIZE) + AS_BSTR_SIZE(HASH_SIZE) + \ 115 ID_CRED_MAX_SIZE + CRED_MAX_SIZE + EAD_SIZE) 116 117 #define INFO_MAX_SIZE CONTEXT_MAC_SIZE + 2 * CBOR_ENCODED_UINT 118 119 #define TH34_INPUT_SIZE \ 120 (AS_BSTR_SIZE(HASH_SIZE) + PLAINTEXT23_MAX_SIZE + CRED_MAX_SIZE) 121 122 #define TH2_INPUT_SIZE (AS_BSTR_SIZE(G_Y_SIZE) + AS_BSTR_SIZE(HASH_SIZE)) 123 124 #endif 125
