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CCA Release 2.54 Decipher
Decipher (CSNBDEC)
Platform/
Product
OS/2 AIX Win NT/
2000
OS/400
IBM 4758-2/23 X X X X
The Decipher verb uses the Data Encryption Standard (DES) or the Commercial
Data Masking Facility (CDMF) algorithm and a cipher key to decipher data
(ciphertext). This verb results in data called plaintext.
Performance can be enhanced if you align the start of the plaintext and ciphertext
variables on a four-byte boundary.
Both single-DES and triple-DES are performed based on the length of the key.
DATA, CIPHER, and DECIPHER key types can be used. For additional information
about the ciphering verbs, see “Ensuring Data Confidentiality” on page 6-1.
Restrictions
The starting address of plaintext cannot begin within the ciphertext variable.
The text_length variable is restricted to a maximum value of 32MB - 8 bytes, and
to 64MB - 8 bytes in the OS/400 environment.
The installed Function Control Vector regulates the maximum data ciphering
capability to one of CDMF, single-DES, or triple-DES.
Format
CSNBDEC
return_code Output Integer
reason_code Output Integer
exit_data_length In/Output Integer
exit_data In/Output String exit_data_length bytes
key_identifier Input String 64 bytes
text_length In/Output Integer
ciphertext Input String text_length bytes
initialization_vector Input String 8 bytes
rule_array_count Input Integer zero, one, two, or three
rule_array Input String
array
rule_array_count * 8 bytes
chaining_vector In/Output String 18 bytes
plaintext Output String text_length bytes
Parameters
For the definitions of the return_code, reason_code, exit_data_length, and exit_data
parameters, see “Parameters Common to All Verbs” on page 1-11.
key_identifier
The key_identifier parameter is a pointer to a string variable containing an
internal key-token or a key label of an internal key-token record in key storage.
text_length
The text_length parameter is a pointer to an integer variable. On input, the
text_length variable contains the number of bytes of data in the ciphertext
variable. On output, the text_length variable contains the number of bytes of
data in the plaintext variable.
Chapter 6. Data Confidentiality and Data Integrity 6-5
- Release 2.54 1
- IBM iSeries PCICC Feature 1
- Contents 3
- CCA Release 2.54 10
- Trademarks 13
- About This Publication 15
- Release 2.52 16
- Release 2.51 16
- Release 2.41 17
- About This Publication xix 19
- Organization 22
- Related Publications 23
- Cryptography Publications 23
- Overlapped Processing 31
- CCA Access-Control 40
- Understanding Access Control 40
- Role-Based Access Control 40
- Understanding Roles 41
- Understanding Profiles 42
- Logging On and Logging Off 45
- Multi-Coprocessor Capability 48
- Establishing Master Keys 51
- Logon_Control (CSUALCT) 90
- Master_Key_Process (CSNBMKP) 97
- Related Information 100
- Random_Number_Tests (CSUARNT) 102
- Restrictions 102
- Parameters 102
- Required Commands 103
- Chapter 3. RSA Key-Management 105
- Key Generation 106
- Key Import 108
- Using the PKA Keys 109
- Extracting a Public Key 110
- PKA_Key_Generate (CSNDPKG) 111
- PKA_Key_Import (CSNDPKI) 115
- PKA_Key_Token_Build (CSNDPKB) 118
- CCA Release 2.54 122
- Digital Signatures 136
- MDC_Generate (CSNBMDG) 144
- One_Way_Hash (CSNBOWH) 147
- Chapter 5. DES Key-Management 151
- Control Vectors 154
- Key Types 155
- Key-Usage Restrictions 156
- Key Tokens 162
- Key Labels 164
- Key Identifiers 164
- Installing and Verifying Keys 165
- Generating Keys 166
- Diversifying Keys 169
- Storing Keys in Key Storage 170
- Security Precautions 171
- Clear_Key_Import (CSNBCKI) 172
- Data_Key_Export (CSNBDKX) 181
- Data_Key_Import (CSNBDKM) 183
- Key_Export (CSNBKEX) 192
- Key_Generate (CSNBKGN) 194
- Key-Length Specification 199
- Key_Import (CSNBKIM) 201
- CCA Release 2.54 Key_Import 203
- Key_Part_Import (CSNBKPI) 204
- Key_Test (CSNBKYT) 208
- Key_Token_Build (CSNBKTB) 211
- Key_Token_Change (CSNBKTC) 214
- Key_Token_Parse (CSNBKTP) 216
- Key_Translate (CSNBKTR) 219
- PKA_Decrypt (CSNDPKD) 223
- PKA_Encrypt (CSNDPKE) 225
- PKA_Encrypt CCA Release 2.54 226
- Ensuring Data Confidentiality 243
- Ensuring Data Integrity 245
- Decipher (CSNBDEC) 247
- Decipher CCA Release 2.54 248
- Encipher (CSNBENC) 250
- CCA Release 2.54 Encipher 251
- MAC_Generate (CSNBMGN) 253
- MAC_Verify (CSNBMVR) 256
- Chapter 7. Key-Storage Verbs 259
- Key-Label Content 260
- DES_Key_Record_List (CSNBKRL) 265
- PKA_Key_Record_List (CSNDKRL) 273
- PKA_Key_Record_Read (CSNDKRR) 275
- Retained_Key_List (CSNDRKL) 280
- Processing Financial PINs 284
- PIN-Verb Summary 287
- Providing Security for PINs 288
- PIN Security 289
- PIN-Calculation Methods 290
- Data_Array 290
- PIN Profile 292
- PIN-Extraction Methods 294
- Working With EMV Smart Cards 295
- Clear_PIN_Encrypt (CSNBCPE) 297
- Clear_PIN_Generate (CSNBPGN) 300
- CVV_Generate (CSNBCSG) 309
- CVV_Verify (CSNBCSV) 312
- PIN_Change/Unblock (CSNBPCU) 334
- SET_Block_Compose (CSNDSBC) 348
- SET_Block_Decompose (CSNDSBD) 352
- Return Codes 361
- Reason Codes 361
- Return Code 0 362
- Return Code 4 363
- Return Code 8 364
- Return Code 12 370
- Return Code 16 371
- Appendix B. Data Structures 373
- Null Key-Token 374
- DES Key-Tokens 375
- External DES Key-Token 377
- RSA PKA Key-Tokens 378
- RSA Key-Token Sections 379
- PKA Key-Token Integrity 380
- Chaining-Vector Records 392
- Key-Storage Records 393
- Key_Record_List Data Set 397
- Role Structure 401
- Aggregate Role Structure 402
- Access-Control-Point List 402
- Default Role Contents 403
- Profile Structure 404
- Aggregate Profile Structure 405
- Authentication Data Structure 405
- User Profile 408
- Role Data Structure 411
- Aggregate Role Data Structure 412
- Function Control Vector 414
- Encryption 417
- Changing Control Vectors 432
- Mask Array Preparation 436
- Notation Used in Calculations 444
- MDC-1 Calculation 444
- MDC-2 Calculation 445
- MDC-4 Calculation 445
- Ciphering Methods 445
- ANSI X9.23 447
- MAC Calculation Methods 453
- RSA Key-Pair Generation 455
- Access-Control Algorithms 456
- ANSI X9.31 Hash Format 459
- PKCS #1 Formats 459
- PIN-Calculation Methods 462
- PIN-Block Formats 469
- 3624 PIN-Block Format 469
- ISO-0 PIN-Block Format 470
- ISO-1 PIN-Block Format 471
- ISO-2 PIN-Block Format 472
- UKPT Calculation Methods 473
- CVV and CVC Method 476
- PIN-Block Self-encryption 479
- Appendix F. Verb List 481
- List of Abbreviations 491
- Glossary 493
- Numerics 499
- PDF File 508
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