harmony 鸿蒙MD Overview and Algorithm Specifications
MD Overview and Algorithm Specifications
The message digest (MD) algorithm allows a fixed-length digest to be generated from data of arbitrary size by using the hash algorithm. The MD algorithm is also referred to as a hash algorithm or a one-way hash algorithm.
When the same digest algorithm is used, the generated digest (hash value) has the following features:
The same message always results in the same hash value.
The digest generated is of the fixed length no matter the length of messages. (The digest length is determined by the algorithm used). For example, SHA-256 generates a digest of 256 bits (32 bytes).
Supported Algorithms and Specifications
The Supported Type column in the following table lists the algorithm to be used when an Md instance is created.
| MD Algorithm | Supported Type | Length (Bytes) | API Version |
|---|---|---|---|
| HASH | SHA1 | 20 | 9+ |
| HASH | SHA224 | 28 | 9+ |
| HASH | SHA256 | 32 | 9+ |
| HASH | SHA384 | 48 | 9+ |
| HASH | SHA512 | 64 | 9+ |
| HASH | MD5 | 16 | 9+ |
| HASH | SM3 | 32 | 10+ |
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