HUKS Cipher Algorithm Specifications

Application Scope

This document provides the HUKS specifications. Mandatory specifications are algorithm specifications that must be supported. Optional specifications can be used based on actual situation. Before using the optional specifications, refer to the documents provided by the vendor to ensure that the specifications are supported.

You are advised to use mandatory specifications to develop applications for compatibility purposes.

Supported Algorithm Types and Parameter Combinations

Key Import/Generation Specifications

Algorithm API Level Supported Key Length (Bit) Mandatory
AES 8+ 128, 192, 256 Yes
RSA 8+ 512, 768, 1024 No
RSA 8+ 2048, 3072, 4096 Yes
HMAC 8+ An integer multiple of 8, ranging from 8 to 1024 (inclusive) Yes
ECC 8+ 224 No
ECC 8+ 256, 384, 521 Yes
Ed25519 8+ 256 Yes
X25519 8+ 256 Yes
DSA 8+ An integer multiple of 8, ranging from 512 to 1024 (inclusive) No
DH 8+ 2048 Yes
DH 8+ 3072, 4096 No
SM2 9+ 256 Yes
SM4 9+ 128 Yes

Specifications for the Combination of the Cipher Algorithm, Block Cipher Mode, and Padding Mode

Algorithm/Block Cipher Mode/Padding Mode API Level Remarks Mandatory
AES/ECB/NoPadding
AES/ECB/PKCS7
8+ No
AES/CBC/NoPadding
AES/CBC/PKCS7
AES/CTR/NoPadding
8+ The IV parameter is mandatory. Yes
AES/GCM/NoPadding 8+ Nonce, AAD, and AEAD are mandatory. Yes
RSA/ECB/NoPadding
RSA/ECB/PKCS1_V1_5
RSA/ECB/OAEP
8+ The OAEP padding mode supports SHA-256, SHA-384, and SHA-512 digest algorithms. Yes
SM4/ECB/NoPadding
SM4/ECB/PKCS7
SM4/CBC/PKCS7
9+ The IV parameter is mandatory in CBC mode. No
SM4/CTR/NoPadding
SM4/CBC/NoPadding
9+ The IV parameter is mandatory. Yes

Specifications for the Combination of the Signing & Signature Verification Algorithm, Digest Algorithm, and Padding Mode

Algorithm/Digest Algorithm/Padding Mode API Level Remarks Mandatory
RSA/MD5/PKCS1_V1_5
RSA/SHA1/PKCS1_V1_5
RSA/SHA224/PKCS1_V1_5
RSA/SHA224/PSS
8+ No
RSA/SHA256/PKCS1_V1_5
RSA/SHA384/PKCS1_V1_5
RSA/SHA512/PKCS1_V1_5
RSA/SHA256/PSS
RSA/SHA384/PSS
RSA/SHA512/PSS
8+ Yes
RSA/NoDigest/PKCS1_V1_5 9+ If NoDigest is used, TAG HuksKeyDigest.HUKS_DIGEST_NONE must be set. No
DSA/SHA1
DSA/SHA224
DSA/SHA256
DSA/SHA384
DSA/SHA512
8+ No
DSA/NoDigest 9+ If NoDigest is used, TAG HuksKeyDigest.HUKS_DIGEST_NONE must be set. No
ECC/SHA1
ECC/SHA224
8+ No
ECC/SHA256
ECC/SHA384
ECC/SHA512
8+ Yes
ECC/NoDigest 9+ If NoDigest is used, TAG HuksKeyDigest.HUKS_DIGEST_NONE must be set. No
ED25519/NoDigest 8+ If NoDigest is used, TAG HuksKeyDigest.HUKS_DIGEST_NONE must be set. Yes
SM2/SM3 9+ Yes

Key Agreement Algorithms

Algorithm API Level Remarks Mandatory
ECDH 8+ The key must be of the ECC type. Yes
DH 8+ Yes
X25519 8+ Yes

Specifications for the Combination of the Digest Algorithm and HMAC Key Length

Digest Key Length API Level Mandatory
SHA256 An integer multiple of 8, ranging from 192 to 1024 8+ Yes
SHA384 An integer multiple of 8, ranging from 256 to 1024 8+ Yes
SHA512 An integer multiple of 8, ranging from 256 to 1024 8+ Yes

Specifications for the Combination of the Derivation Algorithm and Digest

Algorithm/Digest Algorithm/Length of the Base Key Available Algorithm/Length of the Derived Key Remarks API Level Mandatory
HKDF/SHA256 AES/192-256 AES/128/192/256
HMAC/8-1024
SM4/128
A derived key is the key session result obtained by the service using the Init-Update-Finish mechanism. It can be managed by the HUKS (the key is always in a TEE) or independently managed by the service based on service requirements. 8+ Yes
HKDF/SHA384 AES/256 AES/128/192/256
HMAC/8-1024
SM4/128
A derived key is the key session result obtained by the service using the Init-Update-Finish mechanism. It can be managed by the HUKS (the key is always in a TEE) or independently managed by the service based on service requirements. 8+ Yes
HKDF/SHA512 AES/256 AES/128/192/256
HMAC/8-1024
SM4/128
A derived key is the key session result obtained by the service using the Init-Update-Finish mechanism. It can be managed by the HUKS (the key is always in a TEE) or independently managed by the service based on service requirements. 8+ Yes
PBKDF2/SHA256 AES/192-256 AES/128/192/256
HMAC/8-1024
SM4/128
A derived key is the key session result obtained by the service using the Init-Update-Finish mechanism. It can be managed by the HUKS (the key is always in a TEE) or independently managed by the service based on service requirements. 8+ Yes
PBKDF2/SHA384 AES/256 AES/128/192/256
HMAC/8-1024
SM4/128
A derived key is the key session result obtained by the service using the Init-Update-Finish mechanism. It can be managed by the HUKS (the key is always in a TEE) or independently managed by the service based on service requirements. 8+ Yes
PBKDF2/SHA512 AES/256 AES/128/192/256
HMAC/8-1024
SM4/128
A derived key is the key session result obtained by the service using the Init-Update-Finish mechanism. It can be managed by the HUKS (the key is always in a TEE) or independently managed by the service based on service requirements. 8+ Yes

Key Attestation

Algorithm API Level Remarks Mandatory
RSA 9+ The padding mode can be PSS or PKCS1_V1_5. Yes
ECC 9+ Yes
X25519 9+ Yes

Key Material Formats

HUKS defines a set of formats for the material of key pairs, public keys, and private keys of different cipher algorithms.

Key Pair Material

Key pair material = Key pair material header + Original key pair material

The following uses the RSA key as an example. The application needs to apply for a Uint8Array and assign the variables to the corresponding positions based on the memory structure of the RSA key pair material.

Figure 1 Memory structure of the RSA key material

huks_keymaterial_struct

let rsa2048KeyPairMaterial = new Uint8Array([
    0x01, 0x00, 0x00, 0x00, // Key algorithm: huks.HuksKeyAlg.HUKS_ALG_RSA = 1
    0x00, 0x08, 0x00, 0x00, // Key size (bit): 2048
    0x00, 0x01, 0x00, 0x00, // Length of modulus n (byte): 256
    0x03, 0x00, 0x00, 0x00, // Length of the public key exponent e (byte): 3
    0x00, 0x01, 0x00, 0x00, // Length of the private key exponent d (byte): 256
    // Modulus n
    0xc5, 0x35, 0x62, 0x48, 0xc4, 0x92, 0x87, 0x73, 0x0d, 0x42, 0x96, 0xfc, 0x7b, 0x11, 0x05, 0x06,
    0x0f, 0x8d, 0x66, 0xc1, 0x0e, 0xad, 0x37, 0x44, 0x92, 0x95, 0x2f, 0x6a, 0x55, 0xba, 0xec, 0x1d,
    0x54, 0x62, 0x0a, 0x4b, 0xd3, 0xc7, 0x05, 0xe4, 0x07, 0x40, 0xd9, 0xb7, 0xc2, 0x12, 0xcb, 0x9a,
    0x90, 0xad, 0xe3, 0x24, 0xe8, 0x5e, 0xa6, 0xf8, 0xd0, 0x6e, 0xbc, 0xd1, 0x69, 0x7f, 0x6b, 0xe4,
    0x2b, 0x4e, 0x1a, 0x65, 0xbb, 0x73, 0x88, 0x6b, 0x7c, 0xaf, 0x7e, 0xd0, 0x47, 0x26, 0xeb, 0xa5,
    0xbe, 0xd6, 0xe8, 0xee, 0x9c, 0xa5, 0x66, 0xa5, 0xc9, 0xd3, 0x25, 0x13, 0xc4, 0x0e, 0x6c, 0xab,
    0x50, 0xb6, 0x50, 0xc9, 0xce, 0x8f, 0x0a, 0x0b, 0xc6, 0x28, 0x69, 0xe9, 0x83, 0x69, 0xde, 0x42,
    0x56, 0x79, 0x7f, 0xde, 0x86, 0x24, 0xca, 0xfc, 0xaa, 0xc0, 0xf3, 0xf3, 0x7f, 0x92, 0x8e, 0x8a,
    0x12, 0x52, 0xfe, 0x50, 0xb1, 0x5e, 0x8c, 0x01, 0xce, 0xfc, 0x7e, 0xf2, 0x4f, 0x5f, 0x03, 0xfe,
    0xa7, 0xcd, 0xa1, 0xfc, 0x94, 0x52, 0x00, 0x8b, 0x9b, 0x7f, 0x09, 0xab, 0xa8, 0xa4, 0xf5, 0xb4,
    0xa5, 0xaa, 0xfc, 0x72, 0xeb, 0x17, 0x40, 0xa9, 0xee, 0xbe, 0x8f, 0xc2, 0xd1, 0x80, 0xc2, 0x0d,
    0x44, 0xa9, 0x59, 0x44, 0x59, 0x81, 0x3b, 0x5d, 0x4a, 0xde, 0xfb, 0xae, 0x24, 0xfc, 0xa3, 0xd9,
    0xbc, 0x57, 0x55, 0xc2, 0x26, 0xbc, 0x19, 0xa7, 0x9a, 0xc5, 0x59, 0xa3, 0xee, 0x5a, 0xef, 0x41,
    0x80, 0x7d, 0xf8, 0x5e, 0xc1, 0x1d, 0x32, 0x38, 0x41, 0x5b, 0xb6, 0x92, 0xb8, 0xb7, 0x03, 0x0d,
    0x3e, 0x59, 0x0f, 0x1c, 0xb3, 0xe1, 0x2a, 0x95, 0x1a, 0x3b, 0x50, 0x4f, 0xc4, 0x1d, 0xcf, 0x73,
    0x7c, 0x14, 0xca, 0xe3, 0x0b, 0xa7, 0xc7, 0x1a, 0x41, 0x4a, 0xee, 0xbe, 0x1f, 0x43, 0xdd, 0xf9,
    // Public key exponent e
    0x01, 0x00, 0x01,
    // Private key exponent d
    0x88, 0x4b, 0x82, 0xe7, 0xe3, 0xe3, 0x99, 0x75, 0x6c, 0x9e, 0xaf, 0x17, 0x44, 0x3e, 0xd9, 0x07,
    0xfd, 0x4b, 0xae, 0xce, 0x92, 0xc4, 0x28, 0x44, 0x5e, 0x42, 0x79, 0x08, 0xb6, 0xc3, 0x7f, 0x58,
    0x2d, 0xef, 0xac, 0x4a, 0x07, 0xcd, 0xaf, 0x46, 0x8f, 0xb4, 0xc4, 0x43, 0xf9, 0xff, 0x5f, 0x74,
    0x2d, 0xb5, 0xe0, 0x1c, 0xab, 0xf4, 0x6e, 0xd5, 0xdb, 0xc8, 0x0c, 0xfb, 0x76, 0x3c, 0x38, 0x66,
    0xf3, 0x7f, 0x01, 0x43, 0x7a, 0x30, 0x39, 0x02, 0x80, 0xa4, 0x11, 0xb3, 0x04, 0xd9, 0xe3, 0x57,
    0x23, 0xf4, 0x07, 0xfc, 0x91, 0x8a, 0xc6, 0xcc, 0xa2, 0x16, 0x29, 0xb3, 0xe5, 0x76, 0x4a, 0xa8,
    0x84, 0x19, 0xdc, 0xef, 0xfc, 0xb0, 0x63, 0x33, 0x0b, 0xfa, 0xf6, 0x68, 0x0b, 0x08, 0xea, 0x31,
    0x52, 0xee, 0x99, 0xef, 0x43, 0x2a, 0xbe, 0x97, 0xad, 0xb3, 0xb9, 0x66, 0x7a, 0xae, 0xe1, 0x8f,
    0x57, 0x86, 0xe5, 0xfe, 0x14, 0x3c, 0x81, 0xd0, 0x64, 0xf8, 0x86, 0x1a, 0x0b, 0x40, 0x58, 0xc9,
    0x33, 0x49, 0xb8, 0x99, 0xc6, 0x2e, 0x94, 0x70, 0xee, 0x09, 0x88, 0xe1, 0x5c, 0x4e, 0x6c, 0x22,
    0x72, 0xa7, 0x2a, 0x21, 0xdd, 0xd7, 0x1d, 0xfc, 0x63, 0x15, 0x0b, 0xde, 0x06, 0x9c, 0xf3, 0x28,
    0xf3, 0xac, 0x4a, 0xa8, 0xb5, 0x50, 0xca, 0x9b, 0xcc, 0x0a, 0x04, 0xfe, 0x3f, 0x98, 0x68, 0x81,
    0xac, 0x24, 0x53, 0xea, 0x1f, 0x1c, 0x6e, 0x5e, 0xca, 0xe8, 0x31, 0x0d, 0x08, 0x12, 0xf3, 0x26,
    0xf8, 0x5e, 0xeb, 0x10, 0x27, 0xae, 0xaa, 0xc3, 0xad, 0x6c, 0xc1, 0x89, 0xdb, 0x7d, 0x5a, 0x12,
    0x55, 0xad, 0x11, 0x19, 0xa1, 0xa9, 0x8f, 0x0b, 0x6d, 0x78, 0x8d, 0x1c, 0xdf, 0xe5, 0x63, 0x82,
    0x0b, 0x7d, 0x23, 0x04, 0xb4, 0x75, 0x8c, 0xed, 0x77, 0xfc, 0x1a, 0x85, 0x29, 0x11, 0xe0, 0x61,
    ]);

The key algorithm is a value of HuksKeyAlg.

  • RSA Key Pair Material Format
Key Algorithm Key Size Modulus n Length Ln Public Key Exponent e Length Le Private Key Exponent d Length Ld n e d
4 bytes 4 bytes 4 bytes 4 bytes 4 bytes Ln bytes Le bytes Ld bytes
  • ECC Key Pair Material Format
Key Algorithm Key Size Coordinate x Length Lx Coordinate y Length Ly Coordinate z Length Lz x y z
4 bytes 4 bytes 4 bytes 4 bytes 4 bytes Lx bytes Ly bytes Lz bytes
  • DSA Key Pair Material Format
Key Algorithm Key Size Private Key x Length Lx Public Key y Length Ly Prime p Length Lp Prime Factor q Length Lq g length Lg x y p q g
4 bytes 4 bytes 4 bytes 4 bytes 4 bytes 4 bytes 4 bytes Lx bytes Ly bytes Lp bytes Lq bytes Lg bytes
  • DH Key Pair Material Format
Key Algorithm Key Size Public Key pk Length Lpk Private Key sk Length Lsk Reserved Field pk sk
4 bytes 4 bytes 4 bytes 4 bytes 4 bytes Lpk bytes Lsk bytes
  • Curve25519 Key Pair Material Format
Key Algorithm Key Size Public Key pk Length Lpk Private Key sk Length Lsk Reserved Field pk sk
4 bytes 4 bytes 4 bytes 4 bytes 4 bytes Lpk bytes Lsk bytes

Public Key Material

When a public key is exported or imported, the key material is encapsulated in the DER format defined in X.509.

The following is ECC public key in EDR format:

let eccP256PubKey = new Uint8Array([
  0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
  0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x42, 0x00, 0x04, 0xc0, 0xfe, 0x1c, 0x67, 0xde,
  0x86, 0x0e, 0xfb, 0xaf, 0xb5, 0x85, 0x52, 0xb4, 0x0e, 0x1f, 0x6c, 0x6c, 0xaa, 0xc5, 0xd9, 0xd2,
  0x4d, 0xb0, 0x8a, 0x72, 0x24, 0xa1, 0x99, 0xaf, 0xfc, 0x3e, 0x55, 0x5a, 0xac, 0x99, 0x3d, 0xe8,
  0x34, 0x72, 0xb9, 0x47, 0x9c, 0xa6, 0xd8, 0xfb, 0x00, 0xa0, 0x1f, 0x9f, 0x7a, 0x41, 0xe5, 0x44,
  0x3e, 0xb2, 0x76, 0x08, 0xa2, 0xbd, 0xe9, 0x41, 0xd5, 0x2b, 0x9e]);

Private Key Material

The private key material is in the same format as the key pair material. When the private key material is encapsulated, the public key length in the header of the key pair material is set to 0 and original key pair material and the private key material are combined.

Private key material = Header of the key pair material + Original private key material

The following uses the RSA private key material as an example:

huks_keymaterial_rsa_priv_struct

let rsa2048PrivateKeyMaterial = new Uint8Array([
    0x01, 0x00, 0x00, 0x00, // Key algorithm: huks.HuksKeyAlg.HUKS_ALG_RSA = 1
    0x00, 0x08, 0x00, 0x00, // Key size (bit): 2048
    0x00, 0x01, 0x00, 0x00, // Length of modulus n (byte): 256
    0x00, 0x00, 0x00, 0x00, // Length of the public key exponent e (byte): 0
    0x00, 0x01, 0x00, 0x00, // Length of the private key exponent d (byte): 256
    // Modulus n
    0xc5, 0x35, 0x62, 0x48, 0xc4, 0x92, 0x87, 0x73, 0x0d, 0x42, 0x96, 0xfc, 0x7b, 0x11, 0x05, 0x06,
    0x0f, 0x8d, 0x66, 0xc1, 0x0e, 0xad, 0x37, 0x44, 0x92, 0x95, 0x2f, 0x6a, 0x55, 0xba, 0xec, 0x1d,
    0x54, 0x62, 0x0a, 0x4b, 0xd3, 0xc7, 0x05, 0xe4, 0x07, 0x40, 0xd9, 0xb7, 0xc2, 0x12, 0xcb, 0x9a,
    0x90, 0xad, 0xe3, 0x24, 0xe8, 0x5e, 0xa6, 0xf8, 0xd0, 0x6e, 0xbc, 0xd1, 0x69, 0x7f, 0x6b, 0xe4,
    0x2b, 0x4e, 0x1a, 0x65, 0xbb, 0x73, 0x88, 0x6b, 0x7c, 0xaf, 0x7e, 0xd0, 0x47, 0x26, 0xeb, 0xa5,
    0xbe, 0xd6, 0xe8, 0xee, 0x9c, 0xa5, 0x66, 0xa5, 0xc9, 0xd3, 0x25, 0x13, 0xc4, 0x0e, 0x6c, 0xab,
    0x50, 0xb6, 0x50, 0xc9, 0xce, 0x8f, 0x0a, 0x0b, 0xc6, 0x28, 0x69, 0xe9, 0x83, 0x69, 0xde, 0x42,
    0x56, 0x79, 0x7f, 0xde, 0x86, 0x24, 0xca, 0xfc, 0xaa, 0xc0, 0xf3, 0xf3, 0x7f, 0x92, 0x8e, 0x8a,
    0x12, 0x52, 0xfe, 0x50, 0xb1, 0x5e, 0x8c, 0x01, 0xce, 0xfc, 0x7e, 0xf2, 0x4f, 0x5f, 0x03, 0xfe,
    0xa7, 0xcd, 0xa1, 0xfc, 0x94, 0x52, 0x00, 0x8b, 0x9b, 0x7f, 0x09, 0xab, 0xa8, 0xa4, 0xf5, 0xb4,
    0xa5, 0xaa, 0xfc, 0x72, 0xeb, 0x17, 0x40, 0xa9, 0xee, 0xbe, 0x8f, 0xc2, 0xd1, 0x80, 0xc2, 0x0d,
    0x44, 0xa9, 0x59, 0x44, 0x59, 0x81, 0x3b, 0x5d, 0x4a, 0xde, 0xfb, 0xae, 0x24, 0xfc, 0xa3, 0xd9,
    0xbc, 0x57, 0x55, 0xc2, 0x26, 0xbc, 0x19, 0xa7, 0x9a, 0xc5, 0x59, 0xa3, 0xee, 0x5a, 0xef, 0x41,
    0x80, 0x7d, 0xf8, 0x5e, 0xc1, 0x1d, 0x32, 0x38, 0x41, 0x5b, 0xb6, 0x92, 0xb8, 0xb7, 0x03, 0x0d,
    0x3e, 0x59, 0x0f, 0x1c, 0xb3, 0xe1, 0x2a, 0x95, 0x1a, 0x3b, 0x50, 0x4f, 0xc4, 0x1d, 0xcf, 0x73,
    0x7c, 0x14, 0xca, 0xe3, 0x0b, 0xa7, 0xc7, 0x1a, 0x41, 0x4a, 0xee, 0xbe, 0x1f, 0x43, 0xdd, 0xf9,
    // Private key exponent d
    0x88, 0x4b, 0x82, 0xe7, 0xe3, 0xe3, 0x99, 0x75, 0x6c, 0x9e, 0xaf, 0x17, 0x44, 0x3e, 0xd9, 0x07,
    0xfd, 0x4b, 0xae, 0xce, 0x92, 0xc4, 0x28, 0x44, 0x5e, 0x42, 0x79, 0x08, 0xb6, 0xc3, 0x7f, 0x58,
    0x2d, 0xef, 0xac, 0x4a, 0x07, 0xcd, 0xaf, 0x46, 0x8f, 0xb4, 0xc4, 0x43, 0xf9, 0xff, 0x5f, 0x74,
    0x2d, 0xb5, 0xe0, 0x1c, 0xab, 0xf4, 0x6e, 0xd5, 0xdb, 0xc8, 0x0c, 0xfb, 0x76, 0x3c, 0x38, 0x66,
    0xf3, 0x7f, 0x01, 0x43, 0x7a, 0x30, 0x39, 0x02, 0x80, 0xa4, 0x11, 0xb3, 0x04, 0xd9, 0xe3, 0x57,
    0x23, 0xf4, 0x07, 0xfc, 0x91, 0x8a, 0xc6, 0xcc, 0xa2, 0x16, 0x29, 0xb3, 0xe5, 0x76, 0x4a, 0xa8,
    0x84, 0x19, 0xdc, 0xef, 0xfc, 0xb0, 0x63, 0x33, 0x0b, 0xfa, 0xf6, 0x68, 0x0b, 0x08, 0xea, 0x31,
    0x52, 0xee, 0x99, 0xef, 0x43, 0x2a, 0xbe, 0x97, 0xad, 0xb3, 0xb9, 0x66, 0x7a, 0xae, 0xe1, 0x8f,
    0x57, 0x86, 0xe5, 0xfe, 0x14, 0x3c, 0x81, 0xd0, 0x64, 0xf8, 0x86, 0x1a, 0x0b, 0x40, 0x58, 0xc9,
    0x33, 0x49, 0xb8, 0x99, 0xc6, 0x2e, 0x94, 0x70, 0xee, 0x09, 0x88, 0xe1, 0x5c, 0x4e, 0x6c, 0x22,
    0x72, 0xa7, 0x2a, 0x21, 0xdd, 0xd7, 0x1d, 0xfc, 0x63, 0x15, 0x0b, 0xde, 0x06, 0x9c, 0xf3, 0x28,
    0xf3, 0xac, 0x4a, 0xa8, 0xb5, 0x50, 0xca, 0x9b, 0xcc, 0x0a, 0x04, 0xfe, 0x3f, 0x98, 0x68, 0x81,
    0xac, 0x24, 0x53, 0xea, 0x1f, 0x1c, 0x6e, 0x5e, 0xca, 0xe8, 0x31, 0x0d, 0x08, 0x12, 0xf3, 0x26,
    0xf8, 0x5e, 0xeb, 0x10, 0x27, 0xae, 0xaa, 0xc3, 0xad, 0x6c, 0xc1, 0x89, 0xdb, 0x7d, 0x5a, 0x12,
    0x55, 0xad, 0x11, 0x19, 0xa1, 0xa9, 0x8f, 0x0b, 0x6d, 0x78, 0x8d, 0x1c, 0xdf, 0xe5, 0x63, 0x82,
    0x0b, 0x7d, 0x23, 0x04, 0xb4, 0x75, 0x8c, 0xed, 0x77, 0xfc, 0x1a, 0x85, 0x29, 0x11, 0xe0, 0x61,
    ]);