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- Network Working Group C. Adams
- Request for Comments: 2144 Entrust Technologies
- Category: Informational May 1997
-
-
- The CAST-128 Encryption Algorithm
-
- Status of this Memo
-
- This memo provides information for the Internet community. This memo
- does not specify an Internet standard of any kind. Distribution of
- this memo is unlimited.
-
- Abstract
-
- There is a need in the Internet community for an unencumbered
- encryption algorithm with a range of key sizes that can provide
- security for a variety of cryptographic applications and protocols.
-
- This document describes an existing algorithm that can be used to
- satisfy this requirement. Included are a description of the cipher
- and the key scheduling algorithm (Section 2), the s-boxes (Appendix
- A), and a set of test vectors (Appendix B).
-
- TABLE OF CONTENTS
-
- STATUS OF THIS MEMO.............................................1
- ABSTRACT........................................................1
- 1. INTRODUCTION.................................................1
- 2. DESCRIPTION OF ALGORITHM.....................................2
- 3. INTELLECTUAL PROPERTY CONSIDERATIONS.........................8
- 4. SECURITY CONSIDERATIONS......................................8
- 5. REFERENCES...................................................8
- 6. AUTHOR'S ADDRESS.............................................8
- APPENDICES
- A. S-BOXES......................................................9
- B. TEST VECTORS................................................15
-
- 1. Introduction
-
- This document describes the CAST-128 encryption algorithm, a DES-like
- Substitution-Permutation Network (SPN) cryptosystem which appears to
- have good resistance to differential cryptanalysis, linear
- cryptanalysis, and related-key cryptanalysis. This cipher also
- possesses a number of other desirable cryptographic properties,
- including avalanche, Strict Avalanche Criterion (SAC), Bit
- Independence Criterion (BIC), no complementation property, and an
- absence of weak and semi-weak keys. It thus appears to be a good
-
-
-
- Adams Informational [Page 1]
-
- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- candidate for general-purpose use throughout the Internet community
- wherever a cryptographically-strong, freely-available encryption
- algorithm is required.
-
- Adams [Adams] discusses the CAST design procedure in some detail;
- analyses can also be obtained on-line (see, for example, [Web1] or
- [Web2]).
-
- 2. Description of Algorithm
-
- CAST-128 belongs to the class of encryption algorithms known as
- Feistel ciphers; overall operation is thus similar to the Data
- Encryption Standard (DES). The full encryption algorithm is given in
- the following four steps.
-
- INPUT: plaintext m1...m64; key K = k1...k128.
- OUTPUT: ciphertext c1...c64.
-
- 1. (key schedule) Compute 16 pairs of subkeys {Kmi, Kri} from K
- (see Sections 2.1 and 2.4).
- 2. (L0,R0) <-- (m1...m64). (Split the plaintext into left and
- right 32-bit halves L0 = m1...m32 and R0 = m33...m64.)
- 3. (16 rounds) for i from 1 to 16, compute Li and Ri as follows:
- Li = Ri-1;
- Ri = Li-1 ^ f(Ri-1,Kmi,Kri), where f is defined in Section 2.2
- (f is of Type 1, Type 2, or Type 3, depending on i).
- 4. c1...c64 <-- (R16,L16). (Exchange final blocks L16, R16 and
- concatenate to form the ciphertext.)
-
- Decryption is identical to the encryption algorithm given above,
- except that the rounds (and therefore the subkey pairs) are used in
- reverse order to compute (L0,R0) from (R16,L16).
-
- See Appendix B for test vectors which can be used to verify
- correctness of an implementation of this algorithm.
-
- 2.1. Pairs of Round Keys
-
- CAST-128 uses a pair of subkeys per round: a 32-bit quantity Km is
- used as a "masking" key and a 5-bit quantity Kr is used as a
- "rotation" key.
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- Adams Informational [Page 2]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
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- 2.2. Non-Identical Rounds
-
- Three different round functions are used in CAST-128. The rounds are
- as follows (where "D" is the data input to the f function and "Ia" -
- "Id" are the most significant byte through least significant byte of
- I, respectively). Note that "+" and "-" are addition and subtraction
- modulo 2**32, "^" is bitwise XOR, and "<<<" is the circular left-
- shift operation.
-
- Type 1: I = ((Kmi + D) <<< Kri)
- f = ((S1[Ia] ^ S2[Ib]) - S3[Ic]) + S4[Id]
-
- Type 2: I = ((Kmi ^ D) <<< Kri)
- f = ((S1[Ia] - S2[Ib]) + S3[Ic]) ^ S4[Id]
-
- Type 3: I = ((Kmi - D) <<< Kri)
- f = ((S1[Ia] + S2[Ib]) ^ S3[Ic]) - S4[Id]
-
- Rounds 1, 4, 7, 10, 13, and 16 use f function Type 1.
- Rounds 2, 5, 8, 11, and 14 use f function Type 2.
- Rounds 3, 6, 9, 12, and 15 use f function Type 3.
-
-
- 2.3. Substitution Boxes
-
- CAST-128 uses eight substitution boxes: s-boxes S1, S2, S3, and S4
- are round function s-boxes; S5, S6, S7, and S8 are key schedule s-
- boxes. Although 8 s-boxes require a total of 8 KBytes of storage,
- note that only 4 KBytes are required during actual encryption /
- decryption since subkey generation is typically done prior to any
- data input.
-
- See Appendix A for the contents of s-boxes S1 - S8.
-
- 2.4. Key Schedule
-
- Let the 128-bit key be x0x1x2x3x4x5x6x7x8x9xAxBxCxDxExF, where x0
- represents the most significant byte and xF represents the least
- significant byte.
-
- Let z0..zF be intermediate (temporary) bytes.
- Let Si[] represent s-box i and let "^" represent XOR addition.
-
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- Adams Informational [Page 3]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- The subkeys are formed from the key x0x1x2x3x4x5x6x7x8x9xAxBxCxDxExF
- as follows.
-
- z0z1z2z3 = x0x1x2x3 ^ S5[xD] ^ S6[xF] ^ S7[xC] ^ S8[xE] ^ S7[x8]
- z4z5z6z7 = x8x9xAxB ^ S5[z0] ^ S6[z2] ^ S7[z1] ^ S8[z3] ^ S8[xA]
- z8z9zAzB = xCxDxExF ^ S5[z7] ^ S6[z6] ^ S7[z5] ^ S8[z4] ^ S5[x9]
- zCzDzEzF = x4x5x6x7 ^ S5[zA] ^ S6[z9] ^ S7[zB] ^ S8[z8] ^ S6[xB]
- K1 = S5[z8] ^ S6[z9] ^ S7[z7] ^ S8[z6] ^ S5[z2]
- K2 = S5[zA] ^ S6[zB] ^ S7[z5] ^ S8[z4] ^ S6[z6]
- K3 = S5[zC] ^ S6[zD] ^ S7[z3] ^ S8[z2] ^ S7[z9]
- K4 = S5[zE] ^ S6[zF] ^ S7[z1] ^ S8[z0] ^ S8[zC]
- x0x1x2x3 = z8z9zAzB ^ S5[z5] ^ S6[z7] ^ S7[z4] ^ S8[z6] ^ S7[z0]
- x4x5x6x7 = z0z1z2z3 ^ S5[x0] ^ S6[x2] ^ S7[x1] ^ S8[x3] ^ S8[z2]
- x8x9xAxB = z4z5z6z7 ^ S5[x7] ^ S6[x6] ^ S7[x5] ^ S8[x4] ^ S5[z1]
- xCxDxExF = zCzDzEzF ^ S5[xA] ^ S6[x9] ^ S7[xB] ^ S8[x8] ^ S6[z3]
- K5 = S5[x3] ^ S6[x2] ^ S7[xC] ^ S8[xD] ^ S5[x8]
- K6 = S5[x1] ^ S6[x0] ^ S7[xE] ^ S8[xF] ^ S6[xD]
- K7 = S5[x7] ^ S6[x6] ^ S7[x8] ^ S8[x9] ^ S7[x3]
- K8 = S5[x5] ^ S6[x4] ^ S7[xA] ^ S8[xB] ^ S8[x7]
- z0z1z2z3 = x0x1x2x3 ^ S5[xD] ^ S6[xF] ^ S7[xC] ^ S8[xE] ^ S7[x8]
- z4z5z6z7 = x8x9xAxB ^ S5[z0] ^ S6[z2] ^ S7[z1] ^ S8[z3] ^ S8[xA]
- z8z9zAzB = xCxDxExF ^ S5[z7] ^ S6[z6] ^ S7[z5] ^ S8[z4] ^ S5[x9]
- zCzDzEzF = x4x5x6x7 ^ S5[zA] ^ S6[z9] ^ S7[zB] ^ S8[z8] ^ S6[xB]
- K9 = S5[z3] ^ S6[z2] ^ S7[zC] ^ S8[zD] ^ S5[z9]
- K10 = S5[z1] ^ S6[z0] ^ S7[zE] ^ S8[zF] ^ S6[zC]
- K11 = S5[z7] ^ S6[z6] ^ S7[z8] ^ S8[z9] ^ S7[z2]
- K12 = S5[z5] ^ S6[z4] ^ S7[zA] ^ S8[zB] ^ S8[z6]
- x0x1x2x3 = z8z9zAzB ^ S5[z5] ^ S6[z7] ^ S7[z4] ^ S8[z6] ^ S7[z0]
- x4x5x6x7 = z0z1z2z3 ^ S5[x0] ^ S6[x2] ^ S7[x1] ^ S8[x3] ^ S8[z2]
- x8x9xAxB = z4z5z6z7 ^ S5[x7] ^ S6[x6] ^ S7[x5] ^ S8[x4] ^ S5[z1]
- xCxDxExF = zCzDzEzF ^ S5[xA] ^ S6[x9] ^ S7[xB] ^ S8[x8] ^ S6[z3]
- K13 = S5[x8] ^ S6[x9] ^ S7[x7] ^ S8[x6] ^ S5[x3]
- K14 = S5[xA] ^ S6[xB] ^ S7[x5] ^ S8[x4] ^ S6[x7]
- K15 = S5[xC] ^ S6[xD] ^ S7[x3] ^ S8[x2] ^ S7[x8]
- K16 = S5[xE] ^ S6[xF] ^ S7[x1] ^ S8[x0] ^ S8[xD]
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- Adams Informational [Page 4]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- [The remaining half is identical to what is given above, carrying on
- from the last created x0..xF to generate keys K17 - K32.]
-
- z0z1z2z3 = x0x1x2x3 ^ S5[xD] ^ S6[xF] ^ S7[xC] ^ S8[xE] ^ S7[x8]
- z4z5z6z7 = x8x9xAxB ^ S5[z0] ^ S6[z2] ^ S7[z1] ^ S8[z3] ^ S8[xA]
- z8z9zAzB = xCxDxExF ^ S5[z7] ^ S6[z6] ^ S7[z5] ^ S8[z4] ^ S5[x9]
- zCzDzEzF = x4x5x6x7 ^ S5[zA] ^ S6[z9] ^ S7[zB] ^ S8[z8] ^ S6[xB]
- K17 = S5[z8] ^ S6[z9] ^ S7[z7] ^ S8[z6] ^ S5[z2]
- K18 = S5[zA] ^ S6[zB] ^ S7[z5] ^ S8[z4] ^ S6[z6]
- K19 = S5[zC] ^ S6[zD] ^ S7[z3] ^ S8[z2] ^ S7[z9]
- K20 = S5[zE] ^ S6[zF] ^ S7[z1] ^ S8[z0] ^ S8[zC]
- x0x1x2x3 = z8z9zAzB ^ S5[z5] ^ S6[z7] ^ S7[z4] ^ S8[z6] ^ S7[z0]
- x4x5x6x7 = z0z1z2z3 ^ S5[x0] ^ S6[x2] ^ S7[x1] ^ S8[x3] ^ S8[z2]
- x8x9xAxB = z4z5z6z7 ^ S5[x7] ^ S6[x6] ^ S7[x5] ^ S8[x4] ^ S5[z1]
- xCxDxExF = zCzDzEzF ^ S5[xA] ^ S6[x9] ^ S7[xB] ^ S8[x8] ^ S6[z3]
- K21 = S5[x3] ^ S6[x2] ^ S7[xC] ^ S8[xD] ^ S5[x8]
- K22 = S5[x1] ^ S6[x0] ^ S7[xE] ^ S8[xF] ^ S6[xD]
- K23 = S5[x7] ^ S6[x6] ^ S7[x8] ^ S8[x9] ^ S7[x3]
- K24 = S5[x5] ^ S6[x4] ^ S7[xA] ^ S8[xB] ^ S8[x7]
- z0z1z2z3 = x0x1x2x3 ^ S5[xD] ^ S6[xF] ^ S7[xC] ^ S8[xE] ^ S7[x8]
- z4z5z6z7 = x8x9xAxB ^ S5[z0] ^ S6[z2] ^ S7[z1] ^ S8[z3] ^ S8[xA]
- z8z9zAzB = xCxDxExF ^ S5[z7] ^ S6[z6] ^ S7[z5] ^ S8[z4] ^ S5[x9]
- zCzDzEzF = x4x5x6x7 ^ S5[zA] ^ S6[z9] ^ S7[zB] ^ S8[z8] ^ S6[xB]
- K25 = S5[z3] ^ S6[z2] ^ S7[zC] ^ S8[zD] ^ S5[z9]
- K26 = S5[z1] ^ S6[z0] ^ S7[zE] ^ S8[zF] ^ S6[zC]
- K27 = S5[z7] ^ S6[z6] ^ S7[z8] ^ S8[z9] ^ S7[z2]
- K28 = S5[z5] ^ S6[z4] ^ S7[zA] ^ S8[zB] ^ S8[z6]
- x0x1x2x3 = z8z9zAzB ^ S5[z5] ^ S6[z7] ^ S7[z4] ^ S8[z6] ^ S7[z0]
- x4x5x6x7 = z0z1z2z3 ^ S5[x0] ^ S6[x2] ^ S7[x1] ^ S8[x3] ^ S8[z2]
- x8x9xAxB = z4z5z6z7 ^ S5[x7] ^ S6[x6] ^ S7[x5] ^ S8[x4] ^ S5[z1]
- xCxDxExF = zCzDzEzF ^ S5[xA] ^ S6[x9] ^ S7[xB] ^ S8[x8] ^ S6[z3]
- K29 = S5[x8] ^ S6[x9] ^ S7[x7] ^ S8[x6] ^ S5[x3]
- K30 = S5[xA] ^ S6[xB] ^ S7[x5] ^ S8[x4] ^ S6[x7]
- K31 = S5[xC] ^ S6[xD] ^ S7[x3] ^ S8[x2] ^ S7[x8]
- K32 = S5[xE] ^ S6[xF] ^ S7[x1] ^ S8[x0] ^ S8[xD]
-
- 2.4.1. Masking Subkeys And Rotate Subkeys
-
- Let Km1, ..., Km16 be 32-bit masking subkeys (one per round).
- Let Kr1, , Kr16 be 32-bit rotate subkeys (one per round); only the
- least significant 5 bits are used in each round.
-
- for (i=1; i<=16; i++) { Kmi = Ki; Kri = K16+i; }
-
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- Adams Informational [Page 5]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- 2.5. Variable Keysize
-
- The CAST-128 encryption algorithm has been designed to allow a key
- size that can vary from 40 bits to 128 bits, in 8-bit increments
- (that is, the allowable key sizes are 40, 48, 56, 64, ..., 112, 120,
- and 128 bits. For variable keysize operation, the specification is
- as follows:
-
- 1) For key sizes up to and including 80 bits (i.e., 40, 48, 56, 64,
- 72, and 80 bits), the algorithm is exactly as specified but uses
- 12 rounds instead of 16;
-
- 2) For key sizes greater than 80 bits, the algorithm uses the full 16
- rounds;
-
- 3) For key sizes less than 128 bits, the key is padded with zero
- bytes (in the rightmost, or least significant, positions) out to
- 128 bits (since the CAST-128 key schedule assumes an input key of
- 128 bits).
-
- Note that although CAST-128 can support all 12 key sizes listed
- above, 40 bits, 64 bits, 80 bits, and 128 bits are the sizes that
- find utility in typical environments. Therefore, it will likely be
- sufficient for most implementations to support some subset of only
- these four sizes.
-
- In order to avoid confusion when variable keysize operation is used,
- the name CAST-128 is to be considered synonymous with the name CAST5;
- this allows a keysize to be appended without ambiguity. Thus, for
- example, CAST-128 with a 40-bit key is to be referred to as CAST5-40;
- where a 128-bit key is explicitly intended, the name CAST5-128 should
- be used.
-
- 2.6. CAST5 Object Identifiers
-
- For those who may be using CAST in algorithm negotiation within a
- protocol, or in any other context which may require the use of OBJECT
- IDENTIFIERs, the following OIDs have been defined.
-
- algorithms OBJECT IDENTIFIER ::=
- { iso(1) memberBody(2) usa(840) nt(113533) nsn(7) algorithms(66) }
-
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- Adams Informational [Page 6]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
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- cast5CBC OBJECT IDENTIFIER ::= { algorithms cast5CBC(10) }
-
- Parameters ::= SEQUENCE {
- iv OCTET STRING DEFAULT 0, -- Initialization vector
- keyLength INTEGER -- Key length, in bits
- }
-
- Note: The iv is optional and defaults to all-zero. On the encoding
- end, if an all-zero iv is used, then it should absent from
- the Parameters. On the decoding end, an absent iv should be
- interpreted as meaning all-zeros.
-
- This is encryption and decryption in CBC mode using the CAST-128
- symmetric block cipher algorithm.
-
-
- cast5MAC OBJECT IDENTIFIER ::= { algorithms cast5MAC(11) }
-
- Parameters ::= SEQUENCE {
- macLength INTEGER, -- MAC length, in bits
- keyLength INTEGER -- Key length, in bits
- }
-
- This is message authentication using the CAST-128 symmetric block
- cipher algorithm.
-
-
- pbeWithMD5AndCast5CBC OBJECT IDENTIFIER ::=
- { algorithms pbeWithMD5AndCAST5-CBC(12) }
-
- Parameters ::= SEQUENCE {
- salt OCTET STRING,
- iterationCount INTEGER, -- Total number of hash iterations
- keyLength INTEGER -- Key length, in bits
- }
-
- Note: The IV is derived from the hashing procedure and therefore
- need not be included in Parameters.
-
- This is password-based encryption and decryption in CBC mode
- using MD5 and the CAST-128 symmetric block cipher . See PKCS #5
- (which uses the DES cipher) for details of the PBE computation.
-
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- Adams Informational [Page 7]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
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- 2.7. Discussion
-
- CAST-128 is a 12- or 16-round Feistel cipher that has a blocksize of
- 64 bits and a keysize of up to 128 bits; it uses rotation to provide
- intrinsic immunity to linear and differential attacks; it uses a
- mixture of XOR, addition and subtraction (modulo 2**32) in the round
- function; and it uses three variations of the round function itself
- throughout the cipher. Finally, the 8x32 s-boxes used in the round
- function each have a minimum nonlinearity of 74 and a maximum entry
- of 2 in the difference distribution table.
-
- This cipher appears to have cryptographic strength in accordance with
- its keysize (128 bits) and has very good encryption / decryption
- performance: 3.3 MBytes/sec on a 150 MHz Pentium processor.
-
- 3. Intellectual Property Considerations
-
- The CAST-128 cipher described in this document is available worldwide
- on a royalty-free basis for commercial and non-commercial uses.
-
- 4. Security Considerations
-
- This entire memo is about security since it describes an algorithm
- which is specifically intended for cryptographic purposes.
-
- 5. References
-
- [Adams] Adams, C., "Constructing Symmetric Ciphers using the CAST
- Design Procedure", Designs, Codes, and Cryptography (to appear).
-
- [Web1] "Constructing Symmetric Ciphers using the CAST Design
- Procedure" (identical to [Adams] but available on-line) and "CAST
- Design Procedure Addendum", http://www.entrust.com/library.htm.
-
- [Web2] "CAST Encryption Algorithm Related Publications",
- http://adonis.ee.queensu.ca:8000/cast/cast.html.
-
- 6. Author's Address
-
- Carlisle Adams
- Entrust Technologies
- 750 Heron Road,
- Ottawa, Canada, K1V 1A7
-
- E-mail: cadams@entrust.com
- Phone: +1.613.763.9008
-
-
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- Adams Informational [Page 8]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- Appendix A. S-Boxes
-
- S-Box S1
- 30fb40d4 9fa0ff0b 6beccd2f 3f258c7a 1e213f2f 9c004dd3 6003e540 cf9fc949
- bfd4af27 88bbbdb5 e2034090 98d09675 6e63a0e0 15c361d2 c2e7661d 22d4ff8e
- 28683b6f c07fd059 ff2379c8 775f50e2 43c340d3 df2f8656 887ca41a a2d2bd2d
- a1c9e0d6 346c4819 61b76d87 22540f2f 2abe32e1 aa54166b 22568e3a a2d341d0
- 66db40c8 a784392f 004dff2f 2db9d2de 97943fac 4a97c1d8 527644b7 b5f437a7
- b82cbaef d751d159 6ff7f0ed 5a097a1f 827b68d0 90ecf52e 22b0c054 bc8e5935
- 4b6d2f7f 50bb64a2 d2664910 bee5812d b7332290 e93b159f b48ee411 4bff345d
- fd45c240 ad31973f c4f6d02e 55fc8165 d5b1caad a1ac2dae a2d4b76d c19b0c50
- 882240f2 0c6e4f38 a4e4bfd7 4f5ba272 564c1d2f c59c5319 b949e354 b04669fe
- b1b6ab8a c71358dd 6385c545 110f935d 57538ad5 6a390493 e63d37e0 2a54f6b3
- 3a787d5f 6276a0b5 19a6fcdf 7a42206a 29f9d4d5 f61b1891 bb72275e aa508167
- 38901091 c6b505eb 84c7cb8c 2ad75a0f 874a1427 a2d1936b 2ad286af aa56d291
- d7894360 425c750d 93b39e26 187184c9 6c00b32d 73e2bb14 a0bebc3c 54623779
- 64459eab 3f328b82 7718cf82 59a2cea6 04ee002e 89fe78e6 3fab0950 325ff6c2
- 81383f05 6963c5c8 76cb5ad6 d49974c9 ca180dcf 380782d5 c7fa5cf6 8ac31511
- 35e79e13 47da91d0 f40f9086 a7e2419e 31366241 051ef495 aa573b04 4a805d8d
- 548300d0 00322a3c bf64cddf ba57a68e 75c6372b 50afd341 a7c13275 915a0bf5
- 6b54bfab 2b0b1426 ab4cc9d7 449ccd82 f7fbf265 ab85c5f3 1b55db94 aad4e324
- cfa4bd3f 2deaa3e2 9e204d02 c8bd25ac eadf55b3 d5bd9e98 e31231b2 2ad5ad6c
- 954329de adbe4528 d8710f69 aa51c90f aa786bf6 22513f1e aa51a79b 2ad344cc
- 7b5a41f0 d37cfbad 1b069505 41ece491 b4c332e6 032268d4 c9600acc ce387e6d
- bf6bb16c 6a70fb78 0d03d9c9 d4df39de e01063da 4736f464 5ad328d8 b347cc96
- 75bb0fc3 98511bfb 4ffbcc35 b58bcf6a e11f0abc bfc5fe4a a70aec10 ac39570a
- 3f04442f 6188b153 e0397a2e 5727cb79 9ceb418f 1cacd68d 2ad37c96 0175cb9d
- c69dff09 c75b65f0 d9db40d8 ec0e7779 4744ead4 b11c3274 dd24cb9e 7e1c54bd
- f01144f9 d2240eb1 9675b3fd a3ac3755 d47c27af 51c85f4d 56907596 a5bb15e6
- 580304f0 ca042cf1 011a37ea 8dbfaadb 35ba3e4a 3526ffa0 c37b4d09 bc306ed9
- 98a52666 5648f725 ff5e569d 0ced63d0 7c63b2cf 700b45e1 d5ea50f1 85a92872
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- bd91e046 9a56456e dc39200c 20c8c571 962bda1c e1e696ff b141ab08 7cca89b9
- 1a69e783 02cc4843 a2f7c579 429ef47d 427b169c 5ac9f049 dd8f0f00 5c8165bf
-
- S-Box S2
- 1f201094 ef0ba75b 69e3cf7e 393f4380 fe61cf7a eec5207a 55889c94 72fc0651
- ada7ef79 4e1d7235 d55a63ce de0436ba 99c430ef 5f0c0794 18dcdb7d a1d6eff3
- a0b52f7b 59e83605 ee15b094 e9ffd909 dc440086 ef944459 ba83ccb3 e0c3cdfb
- d1da4181 3b092ab1 f997f1c1 a5e6cf7b 01420ddb e4e7ef5b 25a1ff41 e180f806
- 1fc41080 179bee7a d37ac6a9 fe5830a4 98de8b7f 77e83f4e 79929269 24fa9f7b
- e113c85b acc40083 d7503525 f7ea615f 62143154 0d554b63 5d681121 c866c359
- 3d63cf73 cee234c0 d4d87e87 5c672b21 071f6181 39f7627f 361e3084 e4eb573b
- 602f64a4 d63acd9c 1bbc4635 9e81032d 2701f50c 99847ab4 a0e3df79 ba6cf38c
- 10843094 2537a95e f46f6ffe a1ff3b1f 208cfb6a 8f458c74 d9e0a227 4ec73a34
- fc884f69 3e4de8df ef0e0088 3559648d 8a45388c 1d804366 721d9bfd a58684bb
- e8256333 844e8212 128d8098 fed33fb4 ce280ae1 27e19ba5 d5a6c252 e49754bd
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-
-
- Adams Informational [Page 9]
-
- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- c5d655dd eb667064 77840b4d a1b6a801 84db26a9 e0b56714 21f043b7 e5d05860
- 54f03084 066ff472 a31aa153 dadc4755 b5625dbf 68561be6 83ca6b94 2d6ed23b
- eccf01db a6d3d0ba b6803d5c af77a709 33b4a34c 397bc8d6 5ee22b95 5f0e5304
- 81ed6f61 20e74364 b45e1378 de18639b 881ca122 b96726d1 8049a7e8 22b7da7b
- 5e552d25 5272d237 79d2951c c60d894c 488cb402 1ba4fe5b a4b09f6b 1ca815cf
- a20c3005 8871df63 b9de2fcb 0cc6c9e9 0beeff53 e3214517 b4542835 9f63293c
- ee41e729 6e1d2d7c 50045286 1e6685f3 f33401c6 30a22c95 31a70850 60930f13
- 73f98417 a1269859 ec645c44 52c877a9 cdff33a6 a02b1741 7cbad9a2 2180036f
- 50d99c08 cb3f4861 c26bd765 64a3f6ab 80342676 25a75e7b e4e6d1fc 20c710e6
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- 43d79572 7e6dd07c 06dfdf1e 6c6cc4ef 7160a539 73bfbe70 83877605 4523ecf1
-
- S-Box S3
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- beb1f9bf eefbcaea e8cf1950 51df07ae 920e8806 f0ad0548 e13c8d83 927010d5
- 11107d9f 07647db9 b2e3e4d4 3d4f285e b9afa820 fade82e0 a067268b 8272792e
- 553fb2c0 489ae22b d4ef9794 125e3fbc 21fffcee 825b1bfd 9255c5ed 1257a240
- 4e1a8302 bae07fff 528246e7 8e57140e 3373f7bf 8c9f8188 a6fc4ee8 c982b5a5
- a8c01db7 579fc264 67094f31 f2bd3f5f 40fff7c1 1fb78dfc 8e6bd2c1 437be59b
- 99b03dbf b5dbc64b 638dc0e6 55819d99 a197c81c 4a012d6e c5884a28 ccc36f71
- b843c213 6c0743f1 8309893c 0feddd5f 2f7fe850 d7c07f7e 02507fbf 5afb9a04
- a747d2d0 1651192e af70bf3e 58c31380 5f98302e 727cc3c4 0a0fb402 0f7fef82
- 8c96fdad 5d2c2aae 8ee99a49 50da88b8 8427f4a0 1eac5790 796fb449 8252dc15
- efbd7d9b a672597d ada840d8 45f54504 fa5d7403 e83ec305 4f91751a 925669c2
- 23efe941 a903f12e 60270df2 0276e4b6 94fd6574 927985b2 8276dbcb 02778176
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- 1f97c090 081bdb8a 93a07ebe b938ca15 97b03cff 3dc2c0f8 8d1ab2ec 64380e51
- 68cc7bfb d90f2788 12490181 5de5ffd4 dd7ef86a 76a2e214 b9a40368 925d958f
- 4b39fffa ba39aee9 a4ffd30b faf7933b 6d498623 193cbcfa 27627545 825cf47a
- 61bd8ba0 d11e42d1 cead04f4 127ea392 10428db7 8272a972 9270c4a8 127de50b
- 285ba1c8 3c62f44f 35c0eaa5 e805d231 428929fb b4fcdf82 4fb66a53 0e7dc15b
- 1f081fab 108618ae fcfd086d f9ff2889 694bcc11 236a5cae 12deca4d 2c3f8cc5
- d2d02dfe f8ef5896 e4cf52da 95155b67 494a488c b9b6a80c 5c8f82bc 89d36b45
- 3a609437 ec00c9a9 44715253 0a874b49 d773bc40 7c34671c 02717ef6 4feb5536
- a2d02fff d2bf60c4 d43f03c0 50b4ef6d 07478cd1 006e1888 a2e53f55 b9e6d4bc
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-
-
- Adams Informational [Page 10]
-
- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- a2048016 97573833 d7207d67 de0f8f3d 72f87b33 abcc4f33 7688c55d 7b00a6b0
- 947b0001 570075d2 f9bb88f8 8942019e 4264a5ff 856302e0 72dbd92b ee971b69
- 6ea22fde 5f08ae2b af7a616d e5c98767 cf1febd2 61efc8c2 f1ac2571 cc8239c2
- 67214cb8 b1e583d1 b7dc3e62 7f10bdce f90a5c38 0ff0443d 606e6dc6 60543a49
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- f7baefd5 4142ed9c a4315c11 83323ec5 dfef4636 a133c501 e9d3531c ee353783
-
- S-Box S4
- 9db30420 1fb6e9de a7be7bef d273a298 4a4f7bdb 64ad8c57 85510443 fa020ed1
- 7e287aff e60fb663 095f35a1 79ebf120 fd059d43 6497b7b1 f3641f63 241e4adf
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- ee4d111a 0fca5167 71ff904c 2d195ffe 1a05645f 0c13fefe 081b08ca 05170121
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- abe0502e ec8d77de 57971e81 e14f6746 c9335400 6920318f 081dbb99 ffc304a5
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- 20c763ef c366a5fc 9c382880 0ace3205 aac9548a eca1d7c7 041afa32 1d16625a
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- 109873f6 00613096 c32d9521 ada121ff 29908415 7fbb977f af9eb3db 29c9ed2a
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- 7ae5290c 3cb9536b 851e20fe 9833557e 13ecf0b0 d3ffb372 3f85c5c1 0aef7ed2
-
- S-Box S5
- 7ec90c04 2c6e74b9 9b0e66df a6337911 b86a7fff 1dd358f5 44dd9d44 1731167f
- 08fbf1fa e7f511cc d2051b00 735aba00 2ab722d8 386381cb acf6243a 69befd7a
- e6a2e77f f0c720cd c4494816 ccf5c180 38851640 15b0a848 e68b18cb 4caadeff
- 5f480a01 0412b2aa 259814fc 41d0efe2 4e40b48d 248eb6fb 8dba1cfe 41a99b02
- 1a550a04 ba8f65cb 7251f4e7 95a51725 c106ecd7 97a5980a c539b9aa 4d79fe6a
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-
-
- Adams Informational [Page 11]
-
- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- f2f3f763 68af8040 ed0c9e56 11b4958b e1eb5a88 8709e6b0 d7e07156 4e29fea7
- 6366e52d 02d1c000 c4ac8e05 9377f571 0c05372a 578535f2 2261be02 d642a0c9
- df13a280 74b55bd2 682199c0 d421e5ec 53fb3ce8 c8adedb3 28a87fc9 3d959981
- 5c1ff900 fe38d399 0c4eff0b 062407ea aa2f4fb1 4fb96976 90c79505 b0a8a774
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- e822fe15 88570983 750e6249 da627e55 5e76ffa8 b1534546 6d47de08 efe9e7d4
-
- S-Box S6
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- bf9f0960 dfa1e2ed 83f0579d 63ed86b9 1ab6a6b8 de5ebe39 f38ff732 8989b138
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- 89dff0bb 5fe2be78 448f4f33 754613c9 2b05d08d 48b9d585 dc049441 c8098f9b
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-
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- Adams Informational [Page 12]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- 7dede786 c39a3373 42410005 6a091751 0ef3c8a6 890072d6 28207682 a9a9f7be
- bf32679d d45b5b75 b353fd00 cbb0e358 830f220a 1f8fb214 d372cf08 cc3c4a13
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- fba1ae12 2d4bd736 0f25faab a4f3fceb e2969123 257f0c3d 9348af49 361400bc
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- b81a928a 60ed5869 97c55b96 eaec991b 29935913 01fdb7f1 088e8dfa 9ab6f6f5
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- a2d762cf 49c92f54 38b5f331 7128a454 48392905 a65b1db8 851c97bd d675cf2f
-
- S-Box S7
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- ad4ebc46 468f508b 7829435f f124183b 821dba9f aff60ff4 ea2c4e6d 16e39264
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- b9068d78 a33754f4 f430c87d c8a71302 b96d8c32 ebd4e7be be8b9d2d 7979fb06
- e7225308 8b75cf77 11ef8da4 e083c858 8d6b786f 5a6317a6 fa5cf7a0 5dda0033
- f28ebfb0 f5b9c310 a0eac280 08b9767a a3d9d2b0 79d34217 021a718d 9ac6336a
- 2711fd60 438050e3 069908a8 3d7fedc4 826d2bef 4eeb8476 488dcf25 36c9d566
- 28e74e41 c2610aca 3d49a9cf bae3b9df b65f8de6 92aeaf64 3ac7d5e6 9ea80509
- f22b017d a4173f70 dd1e16c3 15e0d7f9 50b1b887 2b9f4fd5 625aba82 6a017962
- 2ec01b9c 15488aa9 d716e740 40055a2c 93d29a22 e32dbf9a 058745b9 3453dc1e
- d699296e 496cff6f 1c9f4986 dfe2ed07 b87242d1 19de7eae 053e561a 15ad6f8c
- 66626c1c 7154c24c ea082b2a 93eb2939 17dcb0f0 58d4f2ae 9ea294fb 52cf564c
- 9883fe66 2ec40581 763953c3 01d6692e d3a0c108 a1e7160e e4f2dfa6 693ed285
- 74904698 4c2b0edd 4f757656 5d393378 a132234f 3d321c5d c3f5e194 4b269301
- c79f022f 3c997e7e 5e4f9504 3ffafbbd 76f7ad0e 296693f4 3d1fce6f c61e45be
- d3b5ab34 f72bf9b7 1b0434c0 4e72b567 5592a33d b5229301 cfd2a87f 60aeb767
- 1814386b 30bcc33d 38a0c07d fd1606f2 c363519b 589dd390 5479f8e6 1cb8d647
- 97fd61a9 ea7759f4 2d57539d 569a58cf e84e63ad 462e1b78 6580f87e f3817914
- 91da55f4 40a230f3 d1988f35 b6e318d2 3ffa50bc 3d40f021 c3c0bdae 4958c24c
- 518f36b2 84b1d370 0fedce83 878ddada f2a279c7 94e01be8 90716f4b 954b8aa3
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- Adams Informational [Page 13]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
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- S-Box S8
- e216300d bbddfffc a7ebdabd 35648095 7789f8b7 e6c1121b 0e241600 052ce8b5
- 11a9cfb0 e5952f11 ece7990a 9386d174 2a42931c 76e38111 b12def3a 37ddddfc
- de9adeb1 0a0cc32c be197029 84a00940 bb243a0f b4d137cf b44e79f0 049eedfd
- 0b15a15d 480d3168 8bbbde5a 669ded42 c7ece831 3f8f95e7 72df191b 7580330d
- 94074251 5c7dcdfa abbe6d63 aa402164 b301d40a 02e7d1ca 53571dae 7a3182a2
- 12a8ddec fdaa335d 176f43e8 71fb46d4 38129022 ce949ad4 b84769ad 965bd862
- 82f3d055 66fb9767 15b80b4e 1d5b47a0 4cfde06f c28ec4b8 57e8726e 647a78fc
- 99865d44 608bd593 6c200e03 39dc5ff6 5d0b00a3 ae63aff2 7e8bd632 70108c0c
- bbd35049 2998df04 980cf42a 9b6df491 9e7edd53 06918548 58cb7e07 3b74ef2e
- 522fffb1 d24708cc 1c7e27cd a4eb215b 3cf1d2e2 19b47a38 424f7618 35856039
- 9d17dee7 27eb35e6 c9aff67b 36baf5b8 09c467cd c18910b1 e11dbf7b 06cd1af8
- 7170c608 2d5e3354 d4de495a 64c6d006 bcc0c62c 3dd00db3 708f8f34 77d51b42
- 264f620f 24b8d2bf 15c1b79e 46a52564 f8d7e54e 3e378160 7895cda5 859c15a5
- e6459788 c37bc75f db07ba0c 0676a3ab 7f229b1e 31842e7b 24259fd7 f8bef472
- 835ffcb8 6df4c1f2 96f5b195 fd0af0fc b0fe134c e2506d3d 4f9b12ea f215f225
- a223736f 9fb4c428 25d04979 34c713f8 c4618187 ea7a6e98 7cd16efc 1436876c
- f1544107 bedeee14 56e9af27 a04aa441 3cf7c899 92ecbae6 dd67016d 151682eb
- a842eedf fdba60b4 f1907b75 20e3030f 24d8c29e e139673b efa63fb8 71873054
- b6f2cf3b 9f326442 cb15a4cc b01a4504 f1e47d8d 844a1be5 bae7dfdc 42cbda70
- cd7dae0a 57e85b7a d53f5af6 20cf4d8c cea4d428 79d130a4 3486ebfb 33d3cddc
- 77853b53 37effcb5 c5068778 e580b3e6 4e68b8f4 c5c8b37e 0d809ea2 398feb7c
- 132a4f94 43b7950e 2fee7d1c 223613bd dd06caa2 37df932b c4248289 acf3ebc3
- 5715f6b7 ef3478dd f267616f c148cbe4 9052815e 5e410fab b48a2465 2eda7fa4
- e87b40e4 e98ea084 5889e9e1 efd390fc dd07d35b db485694 38d7e5b2 57720101
- 730edebc 5b643113 94917e4f 503c2fba 646f1282 7523d24a e0779695 f9c17a8f
- 7a5b2121 d187b896 29263a4d ba510cdf 81f47c9f ad1163ed ea7b5965 1a00726e
- 11403092 00da6d77 4a0cdd61 ad1f4603 605bdfb0 9eedc364 22ebe6a8 cee7d28a
- a0e736a0 5564a6b9 10853209 c7eb8f37 2de705ca 8951570f df09822b bd691a6c
- aa12e4f2 87451c0f e0f6a27a 3ada4819 4cf1764f 0d771c2b 67cdb156 350d8384
- 5938fa0f 42399ef3 36997b07 0e84093d 4aa93e61 8360d87b 1fa98b0c 1149382c
- e97625a5 0614d1b7 0e25244b 0c768347 589e8d82 0d2059d1 a466bb1e f8da0a82
- 04f19130 ba6e4ec0 99265164 1ee7230d 50b2ad80 eaee6801 8db2a283 ea8bf59e
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- Adams Informational [Page 14]
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- RFC 2144 CAST-128 Encryption Algorithms May 1997
-
-
- Appendix B. Test Vectors
-
- This appendix provides test vectors for the CAST-128 cipher described
- this document.
-
- B.1. Single Plaintext-Key-Ciphertext Sets
-
- In order to ensure that the algorithm is implemented correctly, the
- following test vectors can be used for verification (values given in
- hexadecimal notation).
-
- 128-bit key = 01 23 45 67 12 34 56 78 23 45 67 89 34 56 78 9A
- plaintext = 01 23 45 67 89 AB CD EF
- ciphertext = 23 8B 4F E5 84 7E 44 B2
-
- 80-bit key = 01 23 45 67 12 34 56 78 23 45
- = 01 23 45 67 12 34 56 78 23 45 00 00 00 00 00 00
- plaintext = 01 23 45 67 89 AB CD EF
- ciphertext = EB 6A 71 1A 2C 02 27 1B
-
- 40-bit key = 01 23 45 67 12
- = 01 23 45 67 12 00 00 00 00 00 00 00 00 00 00 00
- plaintext = 01 23 45 67 89 AB CD EF
- ciphertext = 7A C8 16 D1 6E 9B 30 2E
-
- B.2. Full Maintenance Test
-
- A maintenance test for CAST-128 has been defined to verify the
- correctness of implementations. It is defined in pseudo-code as
- follows, where a and b are 128-bit vectors, aL and aR are the
- leftmost and rightmost halves of a, bL and bR are the leftmost and
- rightmost halves of b, and encrypt(d,k) is the encryption in ECB mode
- of block d under key k.
-
- Initial a = 01 23 45 67 12 34 56 78 23 45 67 89 34 56 78 9A (hex)
- Initial b = 01 23 45 67 12 34 56 78 23 45 67 89 34 56 78 9A (hex)
-
- do 1,000,000 times
- {
- aL = encrypt(aL,b)
- aR = encrypt(aR,b)
- bL = encrypt(bL,a)
- bR = encrypt(bR,a)
- }
-
- Verify a == EE A9 D0 A2 49 FD 3B A6 B3 43 6F B8 9D 6D CA 92 (hex)
- Verify b == B2 C9 5E B0 0C 31 AD 71 80 AC 05 B8 E8 3D 69 6E (hex)
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- Adams Informational [Page 15]
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-