| 1 | Input data | Input | Char(*) |
| 2 | Length of input data | Input | Binary(4) |
| 3 | Input data format name | Input | Char(8) |
| 4 | Algorithm description | Input | Char(*) |
| 5 | Algorithm description format name | Input | Char(8) |
| 6 | Cryptographic service provider | Input | Char(1) |
| 7 | Cryptographic device name | Input | Char(10) |
| 8 | Hash | Output | Char(*) |
| 9 | Error code | I/O | Char(*) |
The Calculate Hash (OPM, QC3CALHA; ILE, Qc3CalculateHash) API uses a one-way hash function to produce a fixed-length output string from a variable-length input string. For all practical purposes, one-way hashes are irreversible. This property makes them useful for authentication purposes.
Information on cryptographic standards can be found in the Create Algorithm Context (OPM, QC3CRTAX; ILE, Qc3CreateAlgorithmContext) API documentation.
The data to hash.
The format of the input data is specified in the input data format name
parameter
For input data format DATA0100, this is the length of the data to hash.
For input data format DATA0200, this is the number of entries in the array.
The format of the input data parameter.
The possible format names follow.
The algorithm and associated parameters for hashing the data.
The format of the algorithm description is specified in the algorithm
description format name parameter.
The format of the algorithm description.
The possible format names follow.
See Algorithm Description Formats for a description of these formats.
The cryptographic service provider (CSP) that will perform the hash operation.
| 0 | Any CSP. The system will choose an appropriate CSP to perform the hash operation. |
| 1 | Software CSP. The system will perform the hash operation using software. If the requested algorithm is not available in software, an error is returned. |
| 2 | Hardware CSP. The system will perform the hash operation using cryptographic hardware. If the requested algorithm is not available in hardware, an error is returned. A specific cryptographic device can be specified using the cryptographic device name parameter. If the cryptographic device is not specified, the system will choose an appropriate one. |
The name of a cryptographic device description.
This parameter is valid when the cryptographic service provider parameter
specifies 2 (hardware CSP). Otherwise, this parameter must be blanks or the
pointer to this parameter set to NULL.
The area to store the hash. The length of hash is defined by the hash algorithm.
| MD5 | 16 bytes |
| SHA-1 | 20 bytes |
| SHA-256 | 32 bytes |
| SHA-384 | 48 bytes |
| SHA-512 | 64 bytes |
The structure in which to return error information.
For the format of the structure, see Error Code
Parameter.
| Offset | Type | Field | |
|---|---|---|---|
| Dec | Hex | ||
| These fields repeat. | PTR(SPP) | Input data pointer | |
| BINARY(4) | Input data length | ||
| CHAR(12) | Reserved | ||
| Offset | Type | Field | |
|---|---|---|---|
| Dec | Hex | ||
| 0 | 0 | CHAR(8) | Algorithm context token |
| 8 | 8 | CHAR(1) | Final operation flag |
| Offset | Type | Field | |
|---|---|---|---|
| Dec | Hex | ||
| 0 | 0 | BINARY(4) | Hash algorithm |
| 1 | MD5 Documented in RFC 1321. |
| 2 | SHA-1 Documented in FIPS 180-2. |
| 3 | SHA-256 Documented in FIPS 180-2. |
| 4 | SHA-384 Documented in FIPS 180-2. |
| 5 | SHA-512 Documented in FIPS 180-2. |
| 0 | Continue. The system will not perform final processing and the algorithm context will maintain the state of the operation. The algorithm context can be used on future calls to this API to continue the hash operation. The pointer to the hash parameter may be set to NULL because the hash value will not be returned until the final operation flag is set on. |
| 1 | Final. The system will perform final processing. The hash value will be returned and the algorithm context will reset to its initial state. The algorithm context can then be used to begin a new cryptographic operation (hash, HMAC, etc.). When performing a final operation, the pointer to the input data parameter may be set to NULL. |
| Message ID | Error Message Text |
|---|---|
| CPF24B4 E | Severe error while addressing parameter list. |
| CPF3C1E E | Required parameter &1 omitted. |
| CPF3CF1 E | Error code parameter not valid. |
| CPF9872 E | Program or service program &1 in library &2 ended. Reason code &3. |
| CPF9DC7 E | The output data parameter specifies a NULL pointer. |
| CPF9DC8 E | The input data parameter specifies a NULL pointer. |
| CPF9DC9 E | The total length of data in the input data array is not valid. |
| CPF9DCE E | A data length is not valid. |
| CPF9DCF E | A data pointer is not valid. |
| CPF9DD1 E | Input data format name not valid. |
| CPF9DD2 E | Algorithm description format name not valid. |
| CPF9DD5 E | Length of input data not valid. |
| CPF9DDA E | Unexpected return code &1. |
| CPF9DE0 E | Hash algorithm not valid. |
| CPF9DEC E | Cryptographic service provider not valid. |
| CPF9DED E | Final operation flag not valid. |
| CPF9DEE E | Reserved field not null. |
| CPF9DF0 E | Operation, algorithm, or mode not available on the requested CSP (cryptographic service provider). |
| CPF9DF1 E | The algorithm context token does not reference a valid algorithm context. |
| CPF9DF2 E | The algorithm context is not found or was previously destroyed. |
| CPF9DF3 E | Algorithm in algorithm context not valid for requested operation. |
| CPF9DF8 E | Cryptographic device name not valid. |
| CPF9DF9 E | Cryptographic device not found. |
| CPF9DFD E | Not authorized to device. |
| CPF9DFE E | Cryptographic device not available. |
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