Verify a File's SHA256 Against an Expected Digest — verify

Computes the SHA256 digest of a file with the package's own compiled SHA-256 core and compares it to the expected value pinned in provenance.

Usage

verify_sha256(path, expected_sha)

Arguments

path: Path to the file to hash.
expected_sha: The expected SHA256 digest, as a lowercase hex string.

Value

A list with actual (computed digest), expected (the value passed in), and match (logical; TRUE if they are identical).

Examples

f <- tempfile()
writeLines("hello capsule", f)

# Matching digest -> match TRUE.
chk <- verify_sha256(f, sha256_file(f))
chk$match          # TRUE
#> [1] TRUE

# A wrong expected digest -> match FALSE, with both values reported.
bad <- verify_sha256(f, strrep("0", 64L))
bad$match          # FALSE
#> [1] FALSE
bad$actual         # the real digest
#> [1] "55d6110230c260319d580bb6274db530b7e751c4f687fc00d0736ec531260a02"