Burn is expecting SHA1 as the encryption algorithm. However, the FIPS standard states the following :
FIPS 180-1 indicates SHA-1
FIPS 180-2 indicates SHA-2
FIPS 180-4 specifies secure hash algorithms -SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224 and SHA-512/256
As stated by Bob Arnson, Burn might need a new feature allowing different hash algorithm.
Additional informations can be found on the following thread :