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Code Issues Releases Wiki Activity

Addressing errate 151301

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This commit is contained in:
Andreas M. Antonopoulos 2015-02-23 18:09:27 -05:00
parent 3a7b435d85
commit b841235043
2 changed files with 10 additions and 1 deletions
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7
ch04.asciidoc
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@ -555,7 +555,7 @@ include::code/ec-math.py[]
[NOTE]
====
The example above uses +os.urandom+ which reflects a cryptographically secure random number generator (CSRNG) provided by the underlying OS. In the case of UNIX-like operating system such as Linux, it draws from +/dev/urandom+ and in the case of Windows calls +CryptGenRandom()+. If a suitable randomness source is not found, +NotImplementedError+ will be raised. While the random number generator used here is for demonstration purposes, it is not appropriate for generating production-quality bitcoin keys as it is not implemented with sufficient security.
The example above uses +os.urandom+ which reflects a cryptographically secure random number generator (CSRNG) provided by the underlying operating system. In the case of UNIX-like operating system such as Linux, it draws from +/dev/urandom+ and in the case of Windows calls +CryptGenRandom()+. If a suitable randomness source is not found, +NotImplementedError+ will be raised. While the random number generator used here is for demonstration purposes, it is _not_ appropriate for generating production-quality bitcoin keys as it is not implemented with sufficient security.
====
[[ec_math_run]]
@ -961,6 +961,11 @@ include::code/vanity-miner.cpp[]
----
====
[NOTE]
====
The example above uses +std::random_device+. Depending on the implementation it may reflect a cryptographically secure random number generator (CSRNG) provided by the underlying operating system. In the case of UNIX-like operating system such as Linux, it draws from +/dev/urandom+. While the random number generator used here is for demonstration purposes, it is _not_ appropriate for generating production-quality bitcoin keys as it is not implemented with sufficient security.
====
The example code must be compiled using a C++ compiler and linked against the libbitcoin library (which must be first installed on that system). To run the example, run the ++vanity-miner++ executable with no parameters (see <<vanity_miner_run>>) and it will attempt to find a vanity address starting with "1kid".
[[vanity_miner_run]]

4
code/vanity-miner.cpp
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@ -12,8 +12,12 @@ bool match_found(const std::string& address);
int main()
{
// random_device on Linux uses "/dev/urandom"
// CAUTION: Depending on implementation this RNG may not be secure enough!
// Do not use vanity keys generated by this example in production
std::random_device random;
std::default_random_engine engine(random());
// Loop continuously...
while (true)
{