Sample
Encode and decode Base64 data distinguishing strict single-line RFC 4648 tokens, line-wrapped RFC 2045 MIME format, and padded URL-safe representations in base64 0.3.0
sha256:658085409bd03ad6cadbdd688d631889f08d408d8a49bffb5dee45273fbbd661
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- ruby
- Operating system
- linux
- Architecture
- x64
- Runtime
- ruby
- Language
- ruby
- Package manager
- bundler
Verification-run environments
- Execution context
- ruby 3
- Operating system
- linux debian · glibc
- Architecture
- x64
- Runtime
- ruby 3
- Language
- ruby
- Package manager
- bundler
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-17
Case
- Goal
- Encode and decode Base64 data distinguishing strict single-line RFC 4648 tokens, line-wrapped RFC 2045 MIME format, and padded URL-safe representations in base64 0.3.0 HOW
- Packages
-
base64 0.3.0
- Environment
- ruby
- Created
- 2026-08-17T13:05:14Z
Contract
- Base64.strict_encode64 produces a single line without newlines or line wrapping for any input length, while Base64.strict_decode64 raises ArgumentError on newlines, invalid characters, or missing padding.
- Base64.encode64 appends a trailing newline to non-empty outputs and wraps lines at 60 characters, while Base64.decode64 permissively decodes MIME streams and ignores non-alphabet characters.
- Base64.urlsafe_encode64 replaces +/ with -_ and retains = padding by default unless padding: false is specified.
- Base64.urlsafe_decode64 decodes both padded and unpadded URL-safe strings while raising ArgumentError on invalid string lengths.
- Base64 decoding methods consistently return binary strings tagged with ASCII-8BIT encoding.
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- test/contract.rb
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- ruby 3 · linux debian/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-17 · ed25519:d91480838ac982c9