vec_shasigma_be
Purpose
Performs a secure hash computation in accordance with Federal Information Processing Standards FIPS-180-3, which is a specification for the Secure Hash Standard.
This built-in function is valid only when you include the altivec.h file.
Syntax
d=vec_shasigma_be(a, b, c)Result and argument types
The following table describes the types of the returned value and the function arguments.
| d | a | b1 | c2 |
|---|---|---|---|
| vector unsigned int | vector unsigned int | const int | const int |
| vector unsigned long long | vector unsigned long long | const int | const int |
Notes:
- b selects the function type, which can be either lowercase sigma (σ) or uppercase sigma (∑). The argument must be a constant expression with a value of 0 or 1.
- c selects the function subtype, which can be either sigma-0 (σ0 or ∑0) or sigma-1 (σ1 or ∑1). The argument must be a constant expression with a value in the range 0 - 15 inclusive.
Result value
- If a is of type vector unsigned int, for
each element i (i = 0,1,2,3)
of a,
element i of the returned value is the result of
the following SHA-256 function:
- σ0(x[i]), if b is 0 and bit i of the 4-bit c is 0
- σ1(x[i]), if b is 0 and bit i of the 4-bit c is 1
- ∑0(x[i]), if b is nonzero and bit i of the 4-bit c is 0
- ∑1(x[i]), if b is nonzero and bit i of the 4-bit c is 1
- If a is of type vector unsigned long
long,
for each element i (i = 0,1)
of a,
element i of the returned value is the result of
the following SHA-512 function:
- σ0(x[i]), if b is 0 and bit 2*i of the 4-bit c is 0
- σ1(x[i]), if b is 0 and bit 2*i of the 4-bit c is 1
- ∑0(x[i]), if b is nonzero and bit 2*i of the 4-bit c is 0
- ∑1(x[i]), if b is nonzero and bit 2*i of the 4-bit c is 1
