SHAVP1 algorithm
This algorithm is used by the Key Test2 callable service to generate and verify the verification pattern.
VP = Trunc128( SHA256( KA || KT || KL || K ))where:
- VP
- Is the 128-bit verification pattern
- TruncN(x)
- Is truncation of the string x to the left most N bits
- SHA256(x)
- is the SHA-256 hash of the string x
- KA
- Is the one-byte CCA variable-length key token constant for the algorithm of key (HMAC X'03')
- KT
- Is the two-byte CCA variable-length key token constant for the type of key (MAC X'0002')
- KL
- Is the two-byte bit length of the clear key value
- K
- Is the clear key value left-aligned and padded on the right with binary zeros to byte boundary
- ||
- Is string concatenation