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It supports the same hash lengths as SHA-2, and its internal structure differs significantly from the rest of the SHA family. The corresponding standards are FIPS PUB 180 (original SHA), FIPS PUB 180-1 (SHA-1), FIPS PUB 180-2 (SHA-1, SHA-256, SHA-384, and SHA-512). NIST has updated Draft FIPS Publication 202, SHA-3 Standard separate from the ...
SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001. [3] [4] They are built using the Merkle–Damgård construction, from a one-way compression function itself built using the Davies–Meyer structure from a specialized block cipher.
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
SHA-1 160-bit (obsolete) SHA-2 available in 224, 256, 384, and 512-bit variants; HMAC keyed hash; PBKDF2 Key derivation function (RFC 2898) Digital signature standards
General Java API: J2ME, Java Runtime Environment 1.1+, Android. Java FIPS API: Java Runtime 1.5+, Android. C# API (General & FIPS): CLR 4. BSAFE Crypto-J Solaris, Linux, Android, FreeBSD, AIX, 32 and 64-bit Windows, macOS (Darwin) Yes cryptlib
TLS 1.0 (deprecated) TLS 1.1 (deprecated) TLS 1.2 TLS 1.3 EV certificate SHA-2 certificate ECDSA certificate BEAST CRIME POODLE (SSLv3) RC4 FREAK Logjam Protocol selection by user Microsoft Internet Explorer Mobile [n 20] 7–9 Windows Phone 7, 7.5, 7.8: Disabled by default [57] Yes Yes No [citation needed] No [citation needed] No No [citation ...
Collisions against the full SHA-1 algorithm can be produced using the shattered attack and the hash function should be considered broken. SHA-1 produces a hash digest of 160 bits (20 bytes). Documents may refer to SHA-1 as just "SHA", even though this may conflict with the other Secure Hash Algorithms such as SHA-0, SHA-2, and SHA-3.
SHA-1 and SHA-2 are the hash algorithms required by law for use in certain U.S. government applications, including use within other cryptographic algorithms and protocols, for the protection of sensitive unclassified information. FIPS PUB 180-1 also encouraged adoption and use of SHA-1 by private and commercial organizations.