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Does MD5 and SHA only contain alphanumeric characters? (i.e., from A to Z and 0 to 9, or do they exclude some characters?)
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A MD5 hash is a 128 bits message digest represented as 32 hexadecimal characters (0-9 and A-F). For example, “700527793dc07905fd9778bad5665e44” is a MD5 hash. The hexadecimal system is a representation of the base 16, so 16 symbols: 0123456789ABCDEF.
The hash size for the MD5 algorithm is 128 bits. The ComputeHash methods of the MD5 class return the hash as an array of 16 bytes. Note that some MD5 implementations produce a 32-character, hexadecimal-formatted hash.
In cryptography, SHA-1 (Secure Hash Algorithm 1) is a cryptographically broken but still widely used hash function which takes an input and produces a 160-bit (20-byte) hash value known as a message digest – typically rendered as 40 hexadecimal digits.
MD5 and SHA hashes in raw form are binary, however their common representation is a hex-encoded string, which contains characters [a-fA-F0-9].
So if this is what you meant, then characters G-Z, g-z are "excluded".
Another, less common, representation is Base64 encoding [0-9a-zA-Z+/].
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