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Calculate GOST hashes online. Supports GOST and GOST-CRYPTO algorithms, custom salting, multiple iterations, and various input/output formats.
Computes text digests using PHP’s gost / gost-crypto, not encryption, decryption or Streebog. Text is sent to a remote computing service. Before comparing digests, match the algorithm name and text encoding on both sides.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
A hash function turns input data into a fixed-length digest. It is useful when you need to compare a piece of text with a digest produced elsewhere using the same algorithm and the same input bytes. A digest is not encrypted text: there is no decryption operation that restores the original message, and matching digests alone do not prove who created the message.
This calculator accepts text and offers two labeled choices, GOST and GOST-Crypto. The result is returned as a 256-bit digest and displayed in lowercase hexadecimal, uppercase hexadecimal, and Base64. Hexadecimal uses two characters per byte; uppercase and lowercase are different spellings of the same bytes. Base64 is another text representation of those digest bytes, not a different hash.
The name GOST can refer to different specifications. RFC 5831 describes GOST R 34.11-94; RFC 6986 describes GOST R 34.11-2012 and explicitly updates the earlier RFC. Although RFC 6986 defines 256-bit and 512-bit outputs for its version, the calculator's short option labels do not identify a standard number. Do not assume either choice is Streebog or a particular standards-compliant implementation. When interoperability matters, confirm the exact variant and test it against the system or specification you must match.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Paste or type the message into the text field. Spaces, punctuation, capitalization, and line breaks are part of the input; even a small change can produce a different digest.
Select GOST or GOST-Crypto. If you are matching an existing system, use its exact algorithm identifier and confirm its text-to-byte encoding. The page does not expose an encoding control or a standard-version selector.
Choose Calculate Hash. The entered text is sent to a remote calculation service. If the request succeeds, copy the lowercase hex, uppercase hex, or Base64 result as needed.
Compare against a trusted expected digest only after confirming the selected variant and exact input representation on both sides. For hexadecimal, letter case can be normalized; do not change any digits or omit leading zeroes.
Use cases
See how the tool fits into real work and everyday tasks.
If a trusted source provides an expected GOST-family digest for a message, calculate the digest for the exact text and compare the byte values. This can reveal an input mismatch, but the expected value must come from a source you trust.
When two systems return different results, calculate the same text with each available label, then check whitespace, line endings, character encoding, and the required algorithm version. The result can help narrow down a mismatch; it does not certify an implementation or prove regulatory compliance.
Q&A
Find concise answers to common questions and confusing cases.
The label alone does not establish that. RFC 6986 describes GOST R 34.11-2012, while this calculator does not display a standard number or claim Streebog compatibility. Check the required implementation specification before relying on a match.
First confirm that both sides use the same variant and exact text bytes. Check spaces, line endings, capitalization, and encoding. The available labels do not reveal every implementation parameter, so use a known test vector or the target system's own reference when compatibility is important.
No. Hex letter case changes only the written representation. Compare the same characters after normalizing case; Base64 is a separate encoding of the digest bytes.
This page's active GOST form accepts text. It does not offer a GOST file-upload mode or an input-type selector for raw hexadecimal or Base64 bytes.
Notes
Review scope, result limitations, and important precautions before use.
Your text is sent to a remote service for calculation, so do not submit passwords, access tokens, private keys, personal records, or other confidential material. The retention policy is not established here; do not assume that submitted text is processed locally or retained for a particular period.
Do not use the resulting plain digest as a password verifier. Password storage requires a purpose-built, salted password-hashing scheme with an appropriate cost factor, as described in NIST SP 800-63B-4. A public digest also does not authenticate its sender or prevent someone from replacing both a message and its digest. For security or compliance work, verify the algorithm, implementation, and operating requirements with the system owner.
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